summaryrefslogtreecommitdiff
blob: 66819996ea33b4e7a7efddde19083dd66dbec25c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
# Copyright 2002-2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: toolchain-funcs.eclass
# @MAINTAINER:
# Toolchain Ninjas <toolchain@gentoo.org>
# @SUPPORTED_EAPIS: 6 7 8
# @BLURB: functions to query common info about the toolchain
# @DESCRIPTION:
# The toolchain-funcs aims to provide a complete suite of functions
# for gleaning useful information about the toolchain and to simplify
# ugly things like cross-compiling and multilib.  All of this is done
# in such a way that you can rely on the function always returning
# something sane.

if [[ -z ${_TOOLCHAIN_FUNCS_ECLASS} ]]; then
_TOOLCHAIN_FUNCS_ECLASS=1

case ${EAPI} in
	6)
		ewarn "${CATEGORY}/${PF}: ebuild uses ${ECLASS} with deprecated EAPI ${EAPI}!"
		ewarn "${CATEGORY}/${PF}: Support will be removed on 2024-10-08. Please port to newer EAPI."
		;;
	7|8) ;;
	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
esac

inherit multilib

# tc-getPROG <VAR [search vars]> <default> [tuple]
_tc-getPROG() {
	local tuple=$1
	local v var vars=$2
	local prog=( $3 )

	var=${vars%% *}
	for v in ${vars} ; do
		if [[ -n ${!v} ]] ; then
			export ${var}="${!v}"
			echo "${!v}"
			return 0
		fi
	done

	local search=
	[[ -n $4 ]] && search=$(type -p $4-${prog[0]})
	[[ -z ${search} && -n ${!tuple} ]] && search=$(type -p ${!tuple}-${prog[0]})
	[[ -n ${search} ]] && prog[0]=${search##*/}

	export ${var}="${prog[*]}"
	echo "${!var}"
}
tc-getBUILD_PROG() {
	local vars="BUILD_$1 $1_FOR_BUILD HOST$1"
	# respect host vars if not cross-compiling
	# https://bugs.gentoo.org/630282
	tc-is-cross-compiler || vars+=" $1"
	_tc-getPROG CBUILD "${vars}" "${@:2}"
}
tc-getPROG() { _tc-getPROG CHOST "$@"; }

# @FUNCTION: tc-getAR
# @USAGE: [toolchain prefix]
# @RETURN: name of the archiver
tc-getAR() { tc-getPROG AR ar "$@"; }
# @FUNCTION: tc-getAS
# @USAGE: [toolchain prefix]
# @RETURN: name of the assembler
tc-getAS() { tc-getPROG AS as "$@"; }
# @FUNCTION: tc-getCC
# @USAGE: [toolchain prefix]
# @RETURN: name of the C compiler
tc-getCC() { tc-getPROG CC gcc "$@"; }
# @FUNCTION: tc-getCPP
# @USAGE: [toolchain prefix]
# @RETURN: name of the C preprocessor
tc-getCPP() { tc-getPROG CPP "${CC:-gcc} -E" "$@"; }
# @FUNCTION: tc-getCXX
# @USAGE: [toolchain prefix]
# @RETURN: name of the C++ compiler
tc-getCXX() { tc-getPROG CXX g++ "$@"; }
# @FUNCTION: tc-getLD
# @USAGE: [toolchain prefix]
# @RETURN: name of the linker
tc-getLD() { tc-getPROG LD ld "$@"; }
# @FUNCTION: tc-getSTRINGS
# @USAGE: [toolchain prefix]
# @RETURN: name of the strings program
tc-getSTRINGS() { tc-getPROG STRINGS strings "$@"; }
# @FUNCTION: tc-getSTRIP
# @USAGE: [toolchain prefix]
# @RETURN: name of the strip program
tc-getSTRIP() { tc-getPROG STRIP strip "$@"; }
# @FUNCTION: tc-getNM
# @USAGE: [toolchain prefix]
# @RETURN: name of the symbol/object thingy
tc-getNM() { tc-getPROG NM nm "$@"; }
# @FUNCTION: tc-getRANLIB
# @USAGE: [toolchain prefix]
# @RETURN: name of the archive indexer
tc-getRANLIB() { tc-getPROG RANLIB ranlib "$@"; }
# @FUNCTION: tc-getREADELF
# @USAGE: [toolchain prefix]
# @RETURN: name of the ELF reader
tc-getREADELF() { tc-getPROG READELF readelf "$@"; }
# @FUNCTION: tc-getOBJCOPY
# @USAGE: [toolchain prefix]
# @RETURN: name of the object copier
tc-getOBJCOPY() { tc-getPROG OBJCOPY objcopy "$@"; }
# @FUNCTION: tc-getOBJDUMP
# @USAGE: [toolchain prefix]
# @RETURN: name of the object dumper
tc-getOBJDUMP() { tc-getPROG OBJDUMP objdump "$@"; }
# @FUNCTION: tc-getF77
# @USAGE: [toolchain prefix]
# @RETURN: name of the Fortran 77 compiler
tc-getF77() { tc-getPROG F77 gfortran "$@"; }
# @FUNCTION: tc-getFC
# @USAGE: [toolchain prefix]
# @RETURN: name of the Fortran 90 compiler
tc-getFC() { tc-getPROG FC gfortran "$@"; }
# @FUNCTION: tc-getGCJ
# @USAGE: [toolchain prefix]
# @RETURN: name of the java compiler
tc-getGCJ() { tc-getPROG GCJ gcj "$@"; }
# @FUNCTION: tc-getGO
# @USAGE: [toolchain prefix]
# @RETURN: name of the Go compiler
tc-getGO() { tc-getPROG GO gccgo "$@"; }
# @FUNCTION: tc-getPKG_CONFIG
# @USAGE: [toolchain prefix]
# @RETURN: name of the pkg-config tool
tc-getPKG_CONFIG() { tc-getPROG PKG_CONFIG pkg-config "$@"; }
# @FUNCTION: tc-getRC
# @USAGE: [toolchain prefix]
# @RETURN: name of the Windows resource compiler
tc-getRC() { tc-getPROG RC windres "$@"; }
# @FUNCTION: tc-getDLLWRAP
# @USAGE: [toolchain prefix]
# @RETURN: name of the Windows dllwrap utility
tc-getDLLWRAP() { tc-getPROG DLLWRAP dllwrap "$@"; }

# @FUNCTION: tc-getBUILD_AR
# @USAGE: [toolchain prefix]
# @RETURN: name of the archiver for building binaries to run on the build machine
tc-getBUILD_AR() { tc-getBUILD_PROG AR ar "$@"; }
# @FUNCTION: tc-getBUILD_AS
# @USAGE: [toolchain prefix]
# @RETURN: name of the assembler for building binaries to run on the build machine
tc-getBUILD_AS() { tc-getBUILD_PROG AS as "$@"; }
# @FUNCTION: tc-getBUILD_CC
# @USAGE: [toolchain prefix]
# @RETURN: name of the C compiler for building binaries to run on the build machine
tc-getBUILD_CC() { tc-getBUILD_PROG CC gcc "$@"; }
# @FUNCTION: tc-getBUILD_CPP
# @USAGE: [toolchain prefix]
# @RETURN: name of the C preprocessor for building binaries to run on the build machine
tc-getBUILD_CPP() { tc-getBUILD_PROG CPP "$(tc-getBUILD_CC) -E" "$@"; }
# @FUNCTION: tc-getBUILD_CXX
# @USAGE: [toolchain prefix]
# @RETURN: name of the C++ compiler for building binaries to run on the build machine
tc-getBUILD_CXX() { tc-getBUILD_PROG CXX g++ "$@"; }
# @FUNCTION: tc-getBUILD_LD
# @USAGE: [toolchain prefix]
# @RETURN: name of the linker for building binaries to run on the build machine
tc-getBUILD_LD() { tc-getBUILD_PROG LD ld "$@"; }
# @FUNCTION: tc-getBUILD_STRINGS
# @USAGE: [toolchain prefix]
# @RETURN: name of the strings program for building binaries to run on the build machine
tc-getBUILD_STRINGS() { tc-getBUILD_PROG STRINGS strings "$@"; }
# @FUNCTION: tc-getBUILD_STRIP
# @USAGE: [toolchain prefix]
# @RETURN: name of the strip program for building binaries to run on the build machine
tc-getBUILD_STRIP() { tc-getBUILD_PROG STRIP strip "$@"; }
# @FUNCTION: tc-getBUILD_NM
# @USAGE: [toolchain prefix]
# @RETURN: name of the symbol/object thingy for building binaries to run on the build machine
tc-getBUILD_NM() { tc-getBUILD_PROG NM nm "$@"; }
# @FUNCTION: tc-getBUILD_RANLIB
# @USAGE: [toolchain prefix]
# @RETURN: name of the archive indexer for building binaries to run on the build machine
tc-getBUILD_RANLIB() { tc-getBUILD_PROG RANLIB ranlib "$@"; }
# @FUNCTION: tc-getBUILD_READELF
# @USAGE: [toolchain prefix]
# @RETURN: name of the ELF reader for building binaries to run on the build machine
tc-getBUILD_READELF() { tc-getBUILD_PROG READELF readelf "$@"; }
# @FUNCTION: tc-getBUILD_OBJCOPY
# @USAGE: [toolchain prefix]
# @RETURN: name of the object copier for building binaries to run on the build machine
tc-getBUILD_OBJCOPY() { tc-getBUILD_PROG OBJCOPY objcopy "$@"; }
# @FUNCTION: tc-getBUILD_PKG_CONFIG
# @USAGE: [toolchain prefix]
# @RETURN: name of the pkg-config tool for building binaries to run on the build machine
tc-getBUILD_PKG_CONFIG() { tc-getBUILD_PROG PKG_CONFIG pkg-config "$@"; }

# @FUNCTION: tc-getTARGET_CPP
# @USAGE: [toolchain prefix]
# @RETURN: name of the C preprocessor for the toolchain being built (or used)
tc-getTARGET_CPP() {
	if [[ -n ${CTARGET} ]]; then
		_tc-getPROG CTARGET TARGET_CPP "gcc -E" "$@"
	else
		tc-getCPP "$@"
	fi
}

# @FUNCTION: tc-export
# @USAGE: <list of toolchain variables>
# @DESCRIPTION:
# Quick way to export a bunch of compiler vars at once.
tc-export() {
	local var
	for var in "$@" ; do
		[[ $(type -t "tc-get${var}") != "function" ]] && die "tc-export: invalid export variable '${var}'"
		"tc-get${var}" > /dev/null
	done
}

# @FUNCTION: tc-is-cross-compiler
# @RETURN: Shell true if we are using a cross-compiler, shell false otherwise
tc-is-cross-compiler() {
	[[ ${CBUILD:-${CHOST}} != ${CHOST} ]]
}

# @FUNCTION: tc-cpp-is-true
# @USAGE: <condition> [cpp flags]
# @RETURN: Shell true if the condition is true, shell false otherwise.
# @DESCRIPTION:
# Evaluate the given condition using the C preprocessor for CTARGET, if
# defined, or CHOST. Additional arguments are passed through to the cpp
# command. A typical condition would be in the form defined(__FOO__).
tc-cpp-is-true() {
	local CONDITION=${1}
	shift

	$(tc-getTARGET_CPP) "${@}" -P - <<-EOF >/dev/null 2>&1
		#if ${CONDITION}
		true
		#else
		#error false
		#endif
	EOF
}

# @FUNCTION: tc-detect-is-softfloat
# @RETURN: Shell true if detection was possible, shell false otherwise
# @DESCRIPTION:
# Detect whether the CTARGET (or CHOST) toolchain is a softfloat based
# one by examining the toolchain's output, if possible.  Outputs a value
# alike tc-is-softfloat if detection was possible.
tc-detect-is-softfloat() {
	# If fetching CPP falls back to the default (gcc -E) then fail
	# detection as this may not be the correct toolchain.
	[[ $(tc-getTARGET_CPP) == "gcc -E" ]] && return 1

	case ${CTARGET:-${CHOST}} in
		# Avoid autodetection for bare-metal targets. bug #666896
		*-newlib|*-elf|*-eabi|arm64-apple-darwin*)
			return 1 ;;

		# arm-unknown-linux-gnueabi is ambiguous. We used to treat it as
		# hardfloat but we now treat it as softfloat like most everyone
		# else. Check existing toolchains to respect existing systems.
		arm*)
			if tc-cpp-is-true "defined(__ARM_PCS_VFP)"; then
				echo "no"
			else
				# Confusingly __SOFTFP__ is defined only when
				# -mfloat-abi is soft, not softfp.
				if tc-cpp-is-true "defined(__SOFTFP__)"; then
					echo "yes"
				else
					echo "softfp"
				fi
			fi

			return 0 ;;
		*)
			return 1 ;;
	esac
}

# @FUNCTION: tc-tuple-is-softfloat
# @RETURN: See tc-is-softfloat for the possible values.
# @DESCRIPTION:
# Determine whether the CTARGET (or CHOST) toolchain is a softfloat
# based one solely from the tuple.
tc-tuple-is-softfloat() {
	local CTARGET=${CTARGET:-${CHOST}}
	case ${CTARGET//_/-} in
		bfin*|h8300*)
			echo "only" ;;
		*-softfloat-*)
			echo "yes" ;;
		*-softfp-*)
			echo "softfp" ;;
		arm*-hardfloat-*|arm*eabihf)
			echo "no" ;;
		# bare-metal targets have their defaults. bug #666896
		*-newlib|*-elf|*-eabi)
			echo "no" ;;
		arm64-apple-darwin*)
			echo "no" ;;
		arm*)
			echo "yes" ;;
		*)
			echo "no" ;;
	esac
}

# @FUNCTION: tc-is-softfloat
# @DESCRIPTION:
# See if this toolchain is a softfloat based one.
# @CODE
# The possible return values:
#  - only:   the target is always softfloat (never had fpu)
#  - yes:    the target should support softfloat
#  - softfp: (arm specific) the target should use hardfloat insns, but softfloat calling convention
#  - no:     the target doesn't support softfloat
# @CODE
# This allows us to react differently where packages accept
# softfloat flags in the case where support is optional, but
# rejects softfloat flags where the target always lacks an fpu.
tc-is-softfloat() {
	tc-detect-is-softfloat || tc-tuple-is-softfloat
}

# @FUNCTION: tc-is-static-only
# @DESCRIPTION:
# Return shell true if the target does not support shared libs, shell false
# otherwise.
tc-is-static-only() {
	local host=${CTARGET:-${CHOST}}

	# *MiNT doesn't have shared libraries, only platform so far
	[[ ${host} == *-mint* ]]
}

# @FUNCTION: tc-stack-grows-down
# @DESCRIPTION:
# Return shell true if the stack grows down.  This is the default behavior
# for the vast majority of systems out there and usually projects shouldn't
# care about such internal details.
tc-stack-grows-down() {
	# List the few that grow up.
	case ${ARCH} in
		hppa|metag) return 1 ;;
	esac

	# Assume all others grow down.
	return 0
}

# @FUNCTION: tc-export_build_env
# @USAGE: [compiler variables]
# @DESCRIPTION:
# Export common build related compiler settings.
tc-export_build_env() {
	tc-export "$@"
	if tc-is-cross-compiler; then
		# Some build envs will initialize vars like:
		# : ${BUILD_LDFLAGS:-${LDFLAGS}}
		# So make sure all variables are non-empty. #526734
		: "${BUILD_CFLAGS:=-O1 -pipe}"
		: "${BUILD_CXXFLAGS:=-O1 -pipe}"
		: "${BUILD_CPPFLAGS:= }"
		: "${BUILD_LDFLAGS:= }"
	else
		# https://bugs.gentoo.org/654424
		: "${BUILD_CFLAGS:=${CFLAGS}}"
		: "${BUILD_CXXFLAGS:=${CXXFLAGS}}"
		: "${BUILD_CPPFLAGS:=${CPPFLAGS}}"
		: "${BUILD_LDFLAGS:=${LDFLAGS}}"
	fi
	export BUILD_{C,CXX,CPP,LD}FLAGS

	# Some packages use XXX_FOR_BUILD.
	local v
	for v in BUILD_{C,CXX,CPP,LD}FLAGS ; do
		export ${v#BUILD_}_FOR_BUILD="${!v}"
	done
}

# @FUNCTION: tc-env_build
# @USAGE: <command> [command args]
# @DESCRIPTION:
# Setup the compile environment to the build tools and then execute the
# specified command.  We use tc-getBUILD_XX here so that we work with
# all of the semi-[non-]standard env vars like $BUILD_CC which often
# the target build system does not check.
tc-env_build() {
	tc-export_build_env
	CFLAGS=${BUILD_CFLAGS} \
	CXXFLAGS=${BUILD_CXXFLAGS} \
	CPPFLAGS=${BUILD_CPPFLAGS} \
	LDFLAGS=${BUILD_LDFLAGS} \
	AR=$(tc-getBUILD_AR) \
	AS=$(tc-getBUILD_AS) \
	CC=$(tc-getBUILD_CC) \
	CPP=$(tc-getBUILD_CPP) \
	CXX=$(tc-getBUILD_CXX) \
	LD=$(tc-getBUILD_LD) \
	NM=$(tc-getBUILD_NM) \
	PKG_CONFIG=$(tc-getBUILD_PKG_CONFIG) \
	RANLIB=$(tc-getBUILD_RANLIB) \
	READELF=$(tc-getBUILD_READELF) \
	"$@"
}

# @FUNCTION: econf_build
# @USAGE: [econf flags]
# @DESCRIPTION:
# Sometimes we need to locally build up some tools to run on CBUILD because
# the package has helper utils which are compiled+executed when compiling.
# This won't work when cross-compiling as the CHOST is set to a target which
# we cannot natively execute.
#
# For example, the python package will build up a local python binary using
# a portable build system (configure+make), but then use that binary to run
# local python scripts to build up other components of the overall python.
# We cannot rely on the python binary in $PATH as that often times will be
# a different version, or not even installed in the first place.  Instead,
# we compile the code in a different directory to run on CBUILD, and then
# use that binary when compiling the main package to run on CHOST.
#
# For example, with newer EAPIs, you'd do something like:
# @CODE
# src_configure() {
# 	ECONF_SOURCE=${S}
# 	if tc-is-cross-compiler ; then
# 		mkdir "${WORKDIR}"/${CBUILD} || die
# 		pushd "${WORKDIR}"/${CBUILD} >/dev/null || die
# 		econf_build --disable-some-unused-stuff
# 		popd >/dev/null || die
# 	fi
# 	... normal build paths ...
# }
# src_compile() {
# 	if tc-is-cross-compiler ; then
# 		pushd "${WORKDIR}"/${CBUILD} >/dev/null || die
# 		emake one-or-two-build-tools
# 		ln/mv build-tools to normal build paths in ${S}/ || die
# 		popd >/dev/null || die
# 	fi
# 	... normal build paths ...
# }
# @CODE
econf_build() {
	local CBUILD=${CBUILD:-${CHOST}}
	econf_env() { CHOST=${CBUILD} econf "$@"; }
	tc-env_build econf_env "$@"
}

# @FUNCTION: tc-ld-is-bfd
# @USAGE: [toolchain prefix]
# @DESCRIPTION:
# Return true if the current linker is set to GNU bfd.
tc-ld-is-bfd() {
	local out

	# Ensure ld output is in English.
	local -x LC_ALL=C

	# First check the linker directly.
	out=$($(tc-getLD "$@") --version 2>&1)
	if [[ ${out} != "GNU ld"* ]] ; then
		return 1
	fi

	# Then see if they're selecting bfd via compiler flags.
	# Note: We're assuming they're using LDFLAGS to hold the
	# options and not CFLAGS/CXXFLAGS.
	local base="${T}/test-tc-linker"
	cat <<-EOF > "${base}.c"
	int main(void) { return 0; }
	EOF
	out=$($(tc-getCC "$@") ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} -Wl,--version "${base}.c" -o "${base}" 2>&1)
	rm -f "${base}"*
	if [[ ! ${out} =~ .*^"GNU ld".* ]] ; then
		return 1
	fi

	# It's bfd!
	# We use positive logic here unlike tc-ld-is-gold and tc-ld-is-mold
	# because LD might be bfd even if *FLAGS isn't.
	return 0
}

# @FUNCTION: tc-ld-is-gold
# @USAGE: [toolchain prefix]
# @DESCRIPTION:
# Return true if the current linker is set to gold.
tc-ld-is-gold() {
	local out

	# Ensure ld output is in English.
	local -x LC_ALL=C

	# First check the linker directly.
	out=$($(tc-getLD "$@") --version 2>&1)
	if [[ ${out} == *"GNU gold"* ]] ; then
		return 0
	fi

	# Then see if they're selecting gold via compiler flags.
	# Note: We're assuming they're using LDFLAGS to hold the
	# options and not CFLAGS/CXXFLAGS.
	local base="${T}/test-tc-linker"
	cat <<-EOF > "${base}.c"
	int main(void) { return 0; }
	EOF
	out=$($(tc-getCC "$@") ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} -Wl,--version "${base}.c" -o "${base}" 2>&1)
	rm -f "${base}"*
	if [[ ${out} == *"GNU gold"* ]] ; then
		return 0
	fi

	# No gold here!
	return 1
}

# @FUNCTION: tc-ld-is-lld
# @USAGE: [toolchain prefix]
# @DESCRIPTION:
# Return true if the current linker is set to lld.
tc-ld-is-lld() {
	local out

	# Ensure ld output is in English.
	local -x LC_ALL=C

	# First check the linker directly.
	out=$($(tc-getLD "$@") --version 2>&1)
	if [[ ${out} == *"LLD"* ]] ; then
		return 0
	fi

	# Then see if they're selecting lld via compiler flags.
	# Note: We're assuming they're using LDFLAGS to hold the
	# options and not CFLAGS/CXXFLAGS.
	local base="${T}/test-tc-linker"
	cat <<-EOF > "${base}.c"
	int main(void) { return 0; }
	EOF
	out=$($(tc-getCC "$@") ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} -Wl,--version "${base}.c" -o "${base}" 2>&1)
	rm -f "${base}"*
	if [[ ${out} == *"LLD"* ]] ; then
		return 0
	fi

	# No lld here!
	return 1
}


# @FUNCTION: tc-ld-is-mold
# @USAGE: [toolchain prefix]
# @DESCRIPTION:
# Return true if the current linker is set to mold.
tc-ld-is-mold() {
	local out

	# Ensure ld output is in English.
	local -x LC_ALL=C

	# First check the linker directly.
	out=$($(tc-getLD "$@") --version 2>&1)
	if [[ ${out} == *"mold"* ]] ; then
		return 0
	fi

	# Then see if they're selecting mold via compiler flags.
	# Note: We're assuming they're using LDFLAGS to hold the
	# options and not CFLAGS/CXXFLAGS.
	local base="${T}/test-tc-linker"
	cat <<-EOF > "${base}.c"
	int main(void) { return 0; }
	EOF
	out=$($(tc-getCC "$@") ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} -Wl,--version "${base}.c" -o "${base}" 2>&1)
	rm -f "${base}"*
	if [[ ${out} == *"mold"* ]] ; then
		return 0
	fi

	# No mold here!
	return 1
}

# @FUNCTION: tc-ld-disable-gold
# @USAGE: [toolchain prefix]
# @DEPRECATED: tc-ld-force-bfd
# @DESCRIPTION:
# If the gold linker is currently selected, configure the compilation
# settings so that we use the older bfd linker instead.
tc-ld-disable-gold() {
	tc-ld-is-gold "$@" && tc-ld-force-bfd "$@"
}

# @FUNCTION: tc-ld-force-bfd
# @USAGE: [toolchain prefix]
# @DESCRIPTION:
# If a linker other than bfd is currently selected, configure the compilation
# settings so that we use the bfd linker instead.  This function should not
# be used for simple underlinking problems.  This function is intended for use
# when a package is fragile and/or relies on bfd internals.
tc-ld-force-bfd() {
	if tc-ld-is-bfd "$@" ; then
		return
	fi

	ewarn "Forcing usage of the BFD linker"

	# Set up LD to point directly to bfd if it's available.
	# Unset LD first so we get the default value from tc-getLD.
	local ld=$(unset LD; tc-getLD "$@")
	local bfd_ld="${ld}.bfd"
	local path_ld=$(type -P "${bfd_ld}" 2>/dev/null)
	[[ -e ${path_ld} ]] && export LD=${bfd_ld}

	# Set up LDFLAGS to select bfd based on the gcc / clang version.
	if tc-is-gcc || tc-is-clang ; then
		export CFLAGS="${CFLAGS} -fuse-ld=bfd"
		export CXXFLAGS="${CXXFLAGS} -fuse-ld=bfd"
		export LDFLAGS="${LDFLAGS} -fuse-ld=bfd"
	fi
}

# @FUNCTION: _tc-has-openmp
# @INTERNAL
# @USAGE: [toolchain prefix]
# @DESCRIPTION:
# See if the toolchain supports OpenMP.
_tc-has-openmp() {
	local base="${T}/test-tc-openmp"
	cat <<-EOF > "${base}.c"
	#include <omp.h>
	int main(void) {
		int nthreads, tid, ret = 0;
		#pragma omp parallel private(nthreads, tid)
		{
			tid = omp_get_thread_num();
			nthreads = omp_get_num_threads();
			ret += tid + nthreads;
		}
		return ret;
	}
	EOF
	$(tc-getCC "$@") -fopenmp "${base}.c" -o "${base}" >&/dev/null
	local ret=$?
	rm -f "${base}"*
	return ${ret}
}

# @FUNCTION: tc-check-openmp
# @DESCRIPTION:
# Test for OpenMP support with the current compiler and error out with
# a clear error message, telling the user how to rectify the missing
# OpenMP support that has been requested by the ebuild.
#
# You should test for any necessary OpenMP support in pkg_pretend in order to
# warn the user of required toolchain changes.  You must still check for OpenMP
# support at build-time, e.g.
# @CODE
# pkg_pretend() {
#	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
# }
#
# pkg_setup() {
#	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
# }
# @CODE
tc-check-openmp() {
	if ! _tc-has-openmp; then
		eerror "Your current compiler does not support OpenMP!"

		if tc-is-gcc; then
			eerror "Enable OpenMP support by building sys-devel/gcc with USE=\"openmp\"."
		elif tc-is-clang; then
			eerror "OpenMP support in sys-devel/clang is provided by sys-libs/libomp."
		fi

		die "Active compiler does not have required support for OpenMP"
	fi
}

# @FUNCTION: tc-has-tls
# @USAGE: [-s|-c|-l] [toolchain prefix]
# @DESCRIPTION:
# See if the toolchain supports thread local storage (TLS).  Use -s to test the
# compiler, -c to also test the assembler, and -l to also test the C library
# (the default).
tc-has-tls() {
	local base="${T}/test-tc-tls"
	cat <<-EOF > "${base}.c"
	int foo(int *i) {
		static __thread int j = 0;
		return *i ? j : *i;
	}
	EOF

	local flags
	case $1 in
		-s) flags="-S";;
		-c) flags="-c";;
		-l) ;;
		-*) die "Usage: tc-has-tls [-c|-l] [toolchain prefix]";;
	esac

	case "${CHOST}" in
		*-darwin*)
			# bug #612370
			: ${flags:=-dynamiclib}
			;;
		*)
			: ${flags:=-fPIC -shared -Wl,-z,defs}
	esac
	[[ $1 == -* ]] && shift
	$(tc-getCC "$@") ${flags} "${base}.c" -o "${base}" >&/dev/null
	local ret=$?
	rm -f "${base}"*
	return ${ret}
}


# Parse information from CBUILD/CHOST/CTARGET rather than
# use external variables from the profile.
tc-ninja_magic_to_arch() {
	_tc_echo_kernel_alias() { [[ ${type} == "kern" ]] && echo $1 || echo $2 ; }

	local type=$1
	local host=$2
	[[ -z ${host} ]] && host=${CTARGET:-${CHOST}}

	case ${host} in
		arm64*)		echo arm64;;
		aarch64*)	echo arm64;;
		alpha*)		echo alpha;;
		arc*)		echo arc;;
		arm*)		echo arm;;
		avr*)		_tc_echo_kernel_alias avr32 avr;;
		bfin*)		_tc_echo_kernel_alias blackfin bfin;;
		c6x*)		echo c6x;;
		cris*)		echo cris;;
		frv*)		echo frv;;
		hexagon*)	echo hexagon;;
		hppa*)		_tc_echo_kernel_alias parisc hppa;;
		i?86*)		echo x86;;
		ia64*)		echo ia64;;
		loongarch*)	_tc_echo_kernel_alias loongarch loong;;
		m68*)		echo m68k;;
		metag*)		echo metag;;
		microblaze*)	echo microblaze;;
		mips*)		echo mips;;
		nios2*)		echo nios2;;
		nios*)		echo nios;;
		or1k*|or32*)	echo openrisc;;
		powerpc*)
			# Starting with linux-2.6.15, the 'ppc' and 'ppc64' trees
			# have been unified into simply 'powerpc', but until 2.6.16,
			# ppc32 is still using ARCH="ppc" as default
			if [[ ${type} == "kern" ]] ; then
				echo powerpc
			elif [[ ${host} == powerpc64* ]] ; then
				echo ppc64
			else
				echo ppc
			fi
			;;
		riscv*)		echo riscv;;
		s390*)		echo s390;;
		score*)		echo score;;
		sh64*)		_tc_echo_kernel_alias sh64 sh;;
		sh*)		echo sh;;
		sparc64*)	_tc_echo_kernel_alias sparc64 sparc;;
		sparc*)		[[ ${PROFILE_ARCH} == "sparc64" ]] \
						&& _tc_echo_kernel_alias sparc64 sparc \
						|| echo sparc
					;;
		tile*)		echo tile;;
		vax*)		echo vax;;
		x86_64*)
			# Starting with linux-2.6.24, the 'x86_64' and 'i386'
			# trees have been unified into 'x86'.
			if [[ ${type} == "kern" ]] ; then
				echo x86
			else
				echo amd64
			fi
			;;
		xtensa*)	echo xtensa;;

		# since our usage of tc-arch is largely concerned with
		# normalizing inputs for testing ${CTARGET}, let's filter
		# other cross targets (mingw and such) into the unknown.
		*)		echo unknown;;
	esac
}
# @FUNCTION: tc-arch-kernel
# @USAGE: [toolchain prefix]
# @RETURN: name of the kernel arch according to the compiler target
tc-arch-kernel() {
	tc-ninja_magic_to_arch kern "$@"
}
# @FUNCTION: tc-arch
# @USAGE: [toolchain prefix]
# @RETURN: name of the portage arch according to the compiler target
tc-arch() {
	tc-ninja_magic_to_arch portage "$@"
}

# @FUNCTION: tc-endian
# @USAGE: [toolchain prefix]
# @RETURN: 'big' or 'little' corresponding to the passed (or host) endianness
# @DESCRIPTION:
# Accepts 'host' as an argument which defaults to CTARGET and falls back to CHOST
# if unspecified.  Returns 'big' or 'little' depending on whether 'host' is
# big or little endian.
tc-endian() {
	local host=$1
	[[ -z ${host} ]] && host=${CTARGET:-${CHOST}}
	host=${host%%-*}

	case ${host} in
		aarch64*be)	echo big;;
		aarch64)	echo little;;
		alpha*)		echo little;;
		arc*b*)		echo big;;
		arc*)		echo little;;
		arm*b*)		echo big;;
		arm*)		echo little;;
		cris*)		echo little;;
		hppa*)		echo big;;
		i?86*)		echo little;;
		ia64*)		echo little;;
		loongarch*)	echo little;;
		m68*)		echo big;;
		mips*l*)	echo little;;
		mips*)		echo big;;
		powerpc*le)	echo little;;
		powerpc*)	echo big;;
		riscv*)		echo little;;
		s390*)		echo big;;
		sh*b*)		echo big;;
		sh*)		echo little;;
		sparc*)		echo big;;
		x86_64*)	echo little;;
		*)		echo wtf;;
	esac
}

# @FUNCTION: tc-get-compiler-type
# @RETURN: keyword identifying the compiler: gcc, clang, pathcc, unknown
tc-get-compiler-type() {
	local code='
#if defined(__PATHSCALE__)
	HAVE_PATHCC
#elif defined(__clang__)
	HAVE_CLANG
#elif defined(__GNUC__)
	HAVE_GCC
#endif
'
	local res=$($(tc-getCPP "$@") -E -P - <<<"${code}")

	case ${res} in
		*HAVE_PATHCC*)	echo pathcc;;
		*HAVE_CLANG*)	echo clang;;
		*HAVE_GCC*)	echo gcc;;
		*)		echo unknown;;
	esac
}

# @FUNCTION: tc-is-gcc
# @RETURN: Shell true if the current compiler is GCC, false otherwise.
tc-is-gcc() {
	[[ $(tc-get-compiler-type) == gcc ]]
}

# @FUNCTION: tc-is-clang
# @RETURN: Shell true if the current compiler is clang, false otherwise.
tc-is-clang() {
	[[ $(tc-get-compiler-type) == clang ]]
}

# Internal func.  The first argument is the version info to expand.
# Query the preprocessor to improve compatibility across different
# compilers rather than maintaining a --version flag matrix, bug #335943.
_gcc_fullversion() {
	local ver="$1"; shift
	set -- $($(tc-getCPP "$@") -E -P - <<<"__GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__")
	eval echo "${ver}"
}

# @FUNCTION: gcc-fullversion
# @RETURN: compiler version (major.minor.micro: [3.4.6])
gcc-fullversion() {
	_gcc_fullversion '$1.$2.$3' "$@"
}
# @FUNCTION: gcc-version
# @RETURN: compiler version (major.minor: [3.4].6)
gcc-version() {
	_gcc_fullversion '$1.$2' "$@"
}
# @FUNCTION: gcc-major-version
# @RETURN: major compiler version (major: [3].4.6)
gcc-major-version() {
	_gcc_fullversion '$1' "$@"
}
# @FUNCTION: gcc-minor-version
# @RETURN: minor compiler version (minor: 3.[4].6)
gcc-minor-version() {
	_gcc_fullversion '$2' "$@"
}
# @FUNCTION: gcc-micro-version
# @RETURN: micro compiler version (micro: 3.4.[6])
gcc-micro-version() {
	_gcc_fullversion '$3' "$@"
}

# Internal func. Based on _gcc_fullversion() above.
_clang_fullversion() {
	local ver="$1"; shift
	set -- $($(tc-getCPP "$@") -E -P - <<<"__clang_major__ __clang_minor__ __clang_patchlevel__")
	eval echo "${ver}"
}

# @FUNCTION: clang-fullversion
# @RETURN: compiler version (major.minor.micro: [3.4.6])
clang-fullversion() {
	_clang_fullversion '$1.$2.$3' "$@"
}
# @FUNCTION: clang-version
# @RETURN: compiler version (major.minor: [3.4].6)
clang-version() {
	_clang_fullversion '$1.$2' "$@"
}
# @FUNCTION: clang-major-version
# @RETURN: major compiler version (major: [3].4.6)
clang-major-version() {
	_clang_fullversion '$1' "$@"
}
# @FUNCTION: clang-minor-version
# @RETURN: minor compiler version (minor: 3.[4].6)
clang-minor-version() {
	_clang_fullversion '$2' "$@"
}
# @FUNCTION: clang-micro-version
# @RETURN: micro compiler version (micro: 3.4.[6])
clang-micro-version() {
	_clang_fullversion '$3' "$@"
}

# Returns the installation directory - internal toolchain
# function for use by _gcc-specs-exists (for flag-o-matic).
_gcc-install-dir() {
	echo "$(LC_ALL=C $(tc-getCC) -print-search-dirs 2> /dev/null |\
		awk '$1=="install:" {print $2}')"
}
# Returns true if the indicated specs file exists - internal toolchain
# function for use by flag-o-matic.
_gcc-specs-exists() {
	[[ -f $(_gcc-install-dir)/$1 ]]
}

# Returns requested gcc specs directive unprocessed - for used by
# gcc-specs-directive()
# Note; later specs normally overwrite earlier ones; however if a later
# spec starts with '+' then it appends.
# gcc -dumpspecs is parsed first, followed by files listed by "gcc -v"
# as "Reading <file>", in order.  Strictly speaking, if there's a
# $(gcc_install_dir)/specs, the built-in specs aren't read, however by
# the same token anything from 'gcc -dumpspecs' is overridden by
# the contents of $(gcc_install_dir)/specs so the result is the
# same either way.
_gcc-specs-directive_raw() {
	local cc=$(tc-getCC)
	local specfiles=$(LC_ALL=C ${cc} -v 2>&1 | awk '$1=="Reading" {print $NF}')
	${cc} -dumpspecs 2> /dev/null | cat - ${specfiles} | awk -v directive=$1 \
'BEGIN	{ pspec=""; spec=""; outside=1 }
$1=="*"directive":"  { pspec=spec; spec=""; outside=0; next }
	outside || NF==0 || ( substr($1,1,1)=="*" && substr($1,length($1),1)==":" ) { outside=1; next }
	spec=="" && substr($0,1,1)=="+" { spec=pspec " " substr($0,2); next }
	{ spec=spec $0 }
END	{ print spec }'
	return 0
}

# Return the requested gcc specs directive, with all included
# specs expanded.
# Note, it does not check for inclusion loops, which cause it
# to never finish - but such loops are invalid for gcc and we're
# assuming gcc is operational.
gcc-specs-directive() {
	local directive subdname subdirective
	directive="$(_gcc-specs-directive_raw $1)"
	while [[ ${directive} == *%\(*\)* ]]; do
		subdname=${directive/*%\(}
		subdname=${subdname/\)*}
		subdirective="$(_gcc-specs-directive_raw ${subdname})"
		directive="${directive//\%(${subdname})/${subdirective}}"
	done
	echo "${directive}"
	return 0
}

# Returns true if gcc sets relro
gcc-specs-relro() {
	local directive
	directive=$(gcc-specs-directive link_command)
	[[ "${directive/\{!norelro:}" != "${directive}" ]]
}
# Returns true if gcc sets now
gcc-specs-now() {
	local directive
	directive=$(gcc-specs-directive link_command)
	[[ "${directive/\{!nonow:}" != "${directive}" ]]
}
# Returns true if gcc builds PIEs
gcc-specs-pie() {
	local directive
	directive=$(gcc-specs-directive cc1)
	[[ "${directive/\{!nopie:}" != "${directive}" ]]
}
# Returns true if gcc builds with the stack protector
gcc-specs-ssp() {
	local directive
	directive=$(gcc-specs-directive cc1)
	[[ "${directive/\{!fno-stack-protector:}" != "${directive}" ]]
}
# Returns true if gcc upgrades fstack-protector to fstack-protector-all
gcc-specs-ssp-to-all() {
	local directive
	directive=$(gcc-specs-directive cc1)
	[[ "${directive/\{!fno-stack-protector-all:}" != "${directive}" ]]
}
# Returns true if gcc builds with fno-strict-overflow
gcc-specs-nostrict() {
	local directive
	directive=$(gcc-specs-directive cc1)
	[[ "${directive/\{!fstrict-overflow:}" != "${directive}" ]]
}
# Returns true if gcc builds with fstack-check
gcc-specs-stack-check() {
	local directive
	directive=$(gcc-specs-directive cc1)
	[[ "${directive/\{!fno-stack-check:}" != "${directive}" ]]
}

# @FUNCTION: tc-enables-cxx-assertions
# @RETURN: Truth if the current compiler enables assertions in the C++ standard library
# @DESCRIPTION:
# Return truth if the current compiler enables assertions in the C++ standard
# library. For libstdc++, this is -D_GLIBCXX_ASSERTIONS, and for libcxx/libc++,
# this is -D_LIBCPP_ENABLE_ASSERTIONS (deprecated) or -D_LIBCPP_ENABLE_HARDENED_MODE.
tc-enables-cxx-assertions() {
	tc-cpp-is-true "defined(_GLIBCXX_ASSERTIONS) || defined(_LIBCPP_ENABLE_ASSERTIONS) || defined(_LIBCPP_ENABLE_HARDENED_MODE)" ${CPPFLAGS} ${CXXFLAGS}
}

# @FUNCTION: tc-enables-pie
# @RETURN: Truth if the current compiler generates position-independent code (PIC) which can be linked into executables
# @DESCRIPTION:
# Return truth if the current compiler generates position-independent code (PIC)
# which can be linked into executables.
tc-enables-pie() {
	tc-cpp-is-true "defined(__PIE__)" ${CPPFLAGS} ${CFLAGS} ${CXXFLAGS}
}

# @FUNCTION: tc-enables-fortify-source
# @RETURN: Truth if the current compiler enables FORTIFY_SOURCE at any level
# @DESCRIPTION:
# Return truth if the current compiler enables fortification (FORTIFY_SOURCE)
# at any level (-D_FORTIFY_SOURCE).
tc-enables-fortify-source() {
	tc-cpp-is-true "defined(_FORTIFY_SOURCE)" ${CPPFLAGS} ${CFLAGS} ${CXXFLAGS}
}

# @FUNCTION: tc-enables-ssp
# @RETURN: Truth if the current compiler enables stack smashing protection (SSP) on at least minimal level
# @DESCRIPTION:
# Return truth if the current compiler enables stack smashing protection (SSP)
# on level corresponding to any of the following options:
#  -fstack-protector
#  -fstack-protector-strong
#  -fstack-protector-all
tc-enables-ssp() {
	tc-cpp-is-true "defined(__SSP__) || defined(__SSP_STRONG__) || defined(__SSP_ALL__)" ${CPPFLAGS} ${CFLAGS} ${CXXFLAGS}
}

# @FUNCTION: tc-enables-ssp-strong
# @RETURN: Truth if the current compiler enables stack smashing protection (SSP) on at least middle level
# @DESCRIPTION:
# Return truth if the current compiler enables stack smashing protection (SSP)
# on level corresponding to any of the following options:
#  -fstack-protector-strong
#  -fstack-protector-all
tc-enables-ssp-strong() {
	tc-cpp-is-true "defined(__SSP_STRONG__) || defined(__SSP_ALL__)" ${CPPFLAGS} ${CFLAGS} ${CXXFLAGS}
}

# @FUNCTION: tc-enables-ssp-all
# @RETURN: Truth if the current compiler enables stack smashing protection (SSP) on maximal level
# @DESCRIPTION:
# Return truth if the current compiler enables stack smashing protection (SSP)
# on level corresponding to any of the following options:
#  -fstack-protector-all
tc-enables-ssp-all() {
	tc-cpp-is-true "defined(__SSP_ALL__)" ${CPPFLAGS} ${CFLAGS} ${CXXFLAGS}
}


# @FUNCTION: gen_usr_ldscript
# @USAGE: [-a] <list of libs to create linker scripts for>
# @DESCRIPTION:
# This function is deprecated. Use the version from
# usr-ldscript.eclass instead.
gen_usr_ldscript() {
	ewarn "${FUNCNAME}: Please migrate to usr-ldscript.eclass"

	local lib libdir=$(get_libdir) output_format="" auto=false suffix=$(get_libname)
	[[ -z ${ED+set} ]] && local ED=${D%/}${EPREFIX}/

	tc-is-static-only && return
	use prefix && return

	# We only care about stuffing / for the native ABI, bug #479448
	if [[ $(type -t multilib_is_native_abi) == "function" ]] ; then
		multilib_is_native_abi || return 0
	fi

	# Eventually we'd like to get rid of this func completely, bug #417451
	case ${CTARGET:-${CHOST}} in
		*-darwin*) ;;
		*-android*) return 0 ;;
		*linux*) use prefix && return 0 ;;
		*) return 0 ;;
	esac

	# Just make sure it exists
	dodir /usr/${libdir}

	if [[ $1 == "-a" ]] ; then
		auto=true
		shift
		dodir /${libdir}
	fi

	# OUTPUT_FORMAT gives hints to the linker as to what binary format
	# is referenced ... makes multilib saner
	local flags=( ${CFLAGS} ${LDFLAGS} -Wl,--verbose )
	if $(tc-getLD) --version | grep -q 'GNU gold' ; then
		# If they're using gold, manually invoke the old bfd, bug #487696
		local d="${T}/bfd-linker"
		mkdir -p "${d}"
		ln -sf $(type -P ${CHOST}-ld.bfd) "${d}"/ld
		flags+=( -B"${d}" )
	fi
	output_format=$($(tc-getCC) "${flags[@]}" 2>&1 | sed -n 's/^OUTPUT_FORMAT("\([^"]*\)",.*/\1/p')
	[[ -n ${output_format} ]] && output_format="OUTPUT_FORMAT ( ${output_format} )"

	for lib in "$@" ; do
		local tlib
		if ${auto} ; then
			lib="lib${lib}${suffix}"
		else
			# Ensure /lib/${lib} exists to avoid dangling scripts/symlinks.
			# This especially is for AIX where $(get_libname) can return ".a",
			# so /lib/${lib} might be moved to /usr/lib/${lib} (by accident).
			[[ -r ${ED}/${libdir}/${lib} ]] || continue
			#TODO: better die here?
		fi

		case ${CTARGET:-${CHOST}} in
		*-darwin*)
			if ${auto} ; then
				tlib=$(scanmacho -qF'%S#F' "${ED}"/usr/${libdir}/${lib})
			else
				tlib=$(scanmacho -qF'%S#F' "${ED}"/${libdir}/${lib})
			fi
			[[ -z ${tlib} ]] && die "unable to read install_name from ${lib}"
			tlib=${tlib##*/}

			if ${auto} ; then
				mv "${ED}"/usr/${libdir}/${lib%${suffix}}.*${suffix#.} "${ED}"/${libdir}/ || die
				# some install_names are funky: they encode a version
				if [[ ${tlib} != ${lib%${suffix}}.*${suffix#.} ]] ; then
					mv "${ED}"/usr/${libdir}/${tlib%${suffix}}.*${suffix#.} "${ED}"/${libdir}/ || die
				fi
				rm -f "${ED}"/${libdir}/${lib}
			fi

			# Mach-O files have an id, which is like a soname, it tells how
			# another object linking against this lib should reference it.
			# Since we moved the lib from usr/lib into lib this reference is
			# wrong.  Hence, we update it here.  We don't configure with
			# libdir=/lib because that messes up libtool files.
			# Make sure we don't lose the specific version, so just modify the
			# existing install_name
			if [[ ! -w "${ED}/${libdir}/${tlib}" ]] ; then
				chmod u+w "${ED}${libdir}/${tlib}" # needed to write to it
				local nowrite=yes
			fi
			install_name_tool \
				-id "${EPREFIX}"/${libdir}/${tlib} \
				"${ED}"/${libdir}/${tlib} || die "install_name_tool failed"
			[[ -n ${nowrite} ]] && chmod u-w "${ED}${libdir}/${tlib}"
			# Now as we don't use GNU binutils and our linker doesn't
			# understand linker scripts, just create a symlink.
			pushd "${ED}/usr/${libdir}" > /dev/null
			ln -snf "../../${libdir}/${tlib}" "${lib}"
			popd > /dev/null
			;;
		*)
			if ${auto} ; then
				tlib=$(scanelf -qF'%S#F' "${ED}"/usr/${libdir}/${lib})
				[[ -z ${tlib} ]] && die "unable to read SONAME from ${lib}"
				mv "${ED}"/usr/${libdir}/${lib}* "${ED}"/${libdir}/ || die
				# some SONAMEs are funky: they encode a version before the .so
				if [[ ${tlib} != ${lib}* ]] ; then
					mv "${ED}"/usr/${libdir}/${tlib}* "${ED}"/${libdir}/ || die
				fi
				rm -f "${ED}"/${libdir}/${lib}
			else
				tlib=${lib}
			fi
			cat > "${ED}/usr/${libdir}/${lib}" <<-END_LDSCRIPT
			/* GNU ld script
			   Since Gentoo has critical dynamic libraries in /lib, and the static versions
			   in /usr/lib, we need to have a "fake" dynamic lib in /usr/lib, otherwise we
			   run into linking problems.  This "fake" dynamic lib is a linker script that
			   redirects the linker to the real lib.  And yes, this works in the cross-
			   compiling scenario as the sysroot-ed linker will prepend the real path.

			   See bug https://bugs.gentoo.org/4411 for more info.
			 */
			${output_format}
			GROUP ( ${EPREFIX}/${libdir}/${tlib} )
			END_LDSCRIPT
			;;
		esac
		fperms a+x "/usr/${libdir}/${lib}" || die "could not change perms on ${lib}"
	done
}

# @FUNCTION: tc-get-cxx-stdlib
# @DESCRIPTION:
# Attempt to identify the C++ standard library used by the compiler.
# If the library is identified, the function returns 0 and prints one
# of the following:
#
# - ``libc++`` for ``sys-libs/libcxx``
# - ``libstdc++`` for ``sys-devel/gcc``'s libstdc++
#
# If the library is not recognized, the function returns 1.
tc-get-cxx-stdlib() {
	local code='#include <ciso646>

#if defined(_LIBCPP_VERSION)
	HAVE_LIBCXX
#elif defined(__GLIBCXX__)
	HAVE_LIBSTDCPP
#endif
'
	local res=$(
		$(tc-getCXX) ${CPPFLAGS} ${CXXFLAGS} -x c++ -E -P - \
			<<<"${code}" 2>/dev/null
	)

	case ${res} in
		*HAVE_LIBCXX*)
			echo libc++;;
		*HAVE_LIBSTDCPP*)
			echo libstdc++;;
		*)
			return 1;;
	esac

	return 0
}

# @FUNCTION: tc-get-c-rtlib
# @DESCRIPTION:
# Attempt to identify the runtime used by the C/C++ compiler.
# If the runtime is identifed, the function returns 0 and prints one
# of the following:
#
# - ``compiler-rt`` for ``sys-libs/compiler-rt``
# - ``libgcc`` for ``sys-devel/gcc``'s libgcc
#
# If the runtime is not recognized, the function returns 1.
tc-get-c-rtlib() {
	local res=$(
		$(tc-getCC) ${CPPFLAGS} ${CFLAGS} ${LDFLAGS} \
			-print-libgcc-file-name 2>/dev/null
	)

	case ${res} in
		*libclang_rt*)
			echo compiler-rt;;
		*libgcc*)
			echo libgcc;;
		*)
			return 1;;
	esac

	return 0
}

# @FUNCTION: tc-get-ptr-size
# @RETURN: Size of a pointer in bytes for CHOST (e.g. 4 or 8).
tc-get-ptr-size() {
	$(tc-getCPP) -P - <<< __SIZEOF_POINTER__ ||
		die "Could not determine CHOST pointer size"
}

# @FUNCTION: tc-get-build-ptr-size
# @RETURN: Size of a pointer in bytes for CBUILD (e.g. 4 or 8).
tc-get-build-ptr-size() {
	$(tc-getBUILD_CPP) -P - <<< __SIZEOF_POINTER__ ||
		die "Could not determine CBUILD pointer size"
}

# @FUNCTION: tc-is-lto
# @RETURN: Shell true if we are using LTO, shell false otherwise
tc-is-lto() {
	local f="${T}/test-lto.o"
	local ret=1

	case $(tc-get-compiler-type) in
		clang)
			$(tc-getCC) ${CFLAGS} -c -o "${f}" -x c - <<<"" || die
			# If LTO is used, clang will output bytecode and llvm-bcanalyzer
			# will run successfully.  Otherwise, it will output plain object
			# file and llvm-bcanalyzer will exit with error.
			llvm-bcanalyzer "${f}" &>/dev/null && ret=0
			;;
		gcc)
			$(tc-getCC) ${CFLAGS} -c -o "${f}" -x c - <<<"" || die
			[[ $($(tc-getREADELF) -S "${f}") == *.gnu.lto* ]] && ret=0
			;;
	esac
	rm -f "${f}" || die
	return "${ret}"
}

# @FUNCTION: tc-has-64bit-time_t
# @RETURN: Shell true if time_t is at least 64 bits long, false otherwise
tc-has-64bit-time_t() {
	$(tc-getCC) ${CFLAGS} ${CPPFLAGS} -c -x c - -o /dev/null <<-EOF &>/dev/null
		#include <sys/types.h>
		int test[sizeof(time_t) >= 8 ? 1 : -1];
	EOF
	return $?
}

fi