https://bugs.gentoo.org/777420

commit 174dfd47e6da498dbaf057579a15235c077b71d0
Author: orbea <orbea@riseup.net>
Date:   Wed Mar 24 15:56:27 2021 -0700

    fix build failure with slibtool and parallel make (#bug 5494)

diff --git a/Makefile.in b/Makefile.in
index 2ff24b2..6774663 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -46,7 +46,7 @@ LT_RELEASE  = @LT_RELEASE@
 LT_REVISION = @LT_REVISION@
 LT_LDFLAGS  = -no-undefined -rpath $(libdir) -release $(LT_RELEASE) -version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE)
 
-all: $(srcdir)/configure Makefile $(objects) $(objects)/$(TARGET) $(objects)/playwave$(EXE) $(objects)/playmus$(EXE)
+all: $(srcdir)/configure Makefile $(objects)/$(TARGET) $(objects)/playwave$(EXE) $(objects)/playmus$(EXE)
 
 $(srcdir)/configure: $(srcdir)/configure.in
 	@echo "Warning, configure.in is out of date"
@@ -56,8 +56,9 @@ $(srcdir)/configure: $(srcdir)/configure.in
 Makefile: $(srcdir)/Makefile.in
 	$(SHELL) config.status $@
 
-$(objects):
-	$(SHELL) $(auxdir)/mkinstalldirs $@
+$(objects)/.created:
+	$(SHELL) $(auxdir)/mkinstalldirs $(objects)
+	touch $@
 
 .PHONY: all install install-hdrs install-lib install-bin uninstall uninstall-hdrs uninstall-lib uninstall-bin clean distclean dist
 
diff --git a/configure.in b/configure.in
index 240a322..557f640 100644
--- a/configure.in
+++ b/configure.in
@@ -695,14 +695,14 @@ OBJECTS=`echo $SOURCES`
 DEPENDS=`echo $SOURCES`
 OBJECTS=`echo "$OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.c,$(objects)/\1.lo,g'`
 DEPENDS=`echo "$DEPENDS" | sed 's,\([[^ ]]*\)/\([[^ ]]*\)\.c,\\
-$(objects)/\2.lo: \1/\2.c\\
+$(objects)/\2.lo: \1/\2.c\\ \$(objects)/.created\\
 	\$(LIBTOOL) --mode=compile \$(CC) \$(CFLAGS) \$(EXTRA_CFLAGS) '"$DEPENDENCY_TRACKING_OPTIONS"' -c \$< -o \$@,g'`
 
 OBJECTS_CXX=`echo $SOURCES_CXX`
 DEPENDS_CXX=`echo $SOURCES_CXX`
 OBJECTS_CXX=`echo "$OBJECTS_CXX" | sed 's,[[^ ]]*/\([[^ ]]*\)\.cpp,$(objects)/\1.lo,g'`
 DEPENDS_CXX=`echo "$DEPENDS_CXX" | sed 's,\([[^ ]]*\)/\([[^ ]]*\)\.cpp,\\
-$(objects)/\2.lo: \1/\2.cpp\\
+$(objects)/\2.lo: \1/\2.cpp\\ \$(objects)/.created\\
 	\$(LIBTOOL) --mode=compile \$(CXX) \$(CFLAGS) \$(EXTRA_CFLAGS) '"$DEPENDENCY_TRACKING_OPTIONS"' -c \$< -o \$@,g'`
 OBJECTS="$OBJECTS $OBJECTS_CXX"
 DEPENDS="$DEPENDS $DEPENDS_CXX"
@@ -712,7 +712,7 @@ VERSION_OBJECTS=`echo $VERSION_SOURCES`
 VERSION_DEPENDS=`echo $VERSION_SOURCES`
 VERSION_OBJECTS=`echo "$VERSION_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.rc,$(objects)/\1.o,g'`
 VERSION_DEPENDS=`echo "$VERSION_DEPENDS" | sed 's,\([[^ ]]*\)/\([[^ ]]*\)\.rc,\\
-$(objects)/\2.o: \1/\2.rc\\
+$(objects)/\2.o: \1/\2.rc\\ \$(objects)/.created\\
 	\$(WINDRES) \$< \$@,g'`
 VERSION_DEPENDS=`echo "$VERSION_DEPENDS" | sed 's,\\$,\\\\$,g'`
 
@@ -721,7 +721,7 @@ PLAYWAVE_OBJECTS=`echo $PLAYWAVE_SOURCES`
 PLAYWAVE_DEPENDS=`echo $PLAYWAVE_SOURCES`
 PLAYWAVE_OBJECTS=`echo "$PLAYWAVE_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.c,$(objects)/\1.lo,g'`
 PLAYWAVE_DEPENDS=`echo "$PLAYWAVE_DEPENDS" | sed 's,\([[^ ]]*\)/\([[^ ]]*\)\.c,\\
-$(objects)/\2.lo: \1/\2.c\\
+$(objects)/\2.lo: \1/\2.c\\ \$(objects)/.created\\
 	\$(LIBTOOL) --mode=compile \$(CC) \$(CFLAGS) \$(EXTRA_CFLAGS) '"$DEPENDENCY_TRACKING_OPTIONS"' -c \$< -o \$@,g'`
 PLAYWAVE_DEPENDS=`echo "$PLAYWAVE_DEPENDS" | sed 's,\\$,\\\\$,g'`
 
@@ -730,7 +730,7 @@ PLAYMUS_OBJECTS=`echo $PLAYMUS_SOURCES`
 PLAYMUS_DEPENDS=`echo $PLAYMUS_SOURCES`
 PLAYMUS_OBJECTS=`echo "$PLAYMUS_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.c,$(objects)/\1.lo,g'`
 PLAYMUS_DEPENDS=`echo "$PLAYMUS_DEPENDS" | sed 's,\([[^ ]]*\)/\([[^ ]]*\)\.c,\\
-$(objects)/\2.lo: \1/\2.c\\
+$(objects)/\2.lo: \1/\2.c\\ \$(objects)/.created\\
 	\$(LIBTOOL) --mode=compile \$(CC) \$(CFLAGS) \$(EXTRA_CFLAGS) '"$DEPENDENCY_TRACKING_OPTIONS"' -c \$< -o \$@,g'`
 PLAYMUS_DEPENDS=`echo "$PLAYMUS_DEPENDS" | sed 's,\\$,\\\\$,g'`