[PATCH] newlib: libm: workaround ar duplicate member behavior

[Mike Frysinger <vapier@gentoo.org>]

GNU ar has undocumented behavior where it doesn't dedupe its inputs if
they're all on the same command line, so we have to dedupe ourselves.
---
 newlib/Makefile.am | 16 ++++++++++++++++
 newlib/Makefile.in | 15 ++++++++++-----
 2 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/newlib/Makefile.am b/newlib/Makefile.am
index 80256952da3d..5bbe266cc4d5 100644
--- a/newlib/Makefile.am
+++ b/newlib/Makefile.am
@@ -124,6 +124,22 @@ libm_a_CCASFLAGS = $(AM_CCASFLAGS) $(libm_a_CCASFLAGS_$(subst /,_,$(@D))) $(libm
 libm_a_CPPFLAGS = $(AM_CPPFLAGS) -I$(srcdir)/libm/common $(libm_a_CPPFLAGS_$(subst /,_,$(@D))) $(libm_a_CPPFLAGS_$(subst /,_,$(@D)_$(<F)))
 $(libm_a_OBJECTS): stmp-targ-include
 
+## GNU ar has undocumented behavior when specifying the same name multiple times
+## in a single invocation, so we have to dedupe ourselves by copying objects to
+## a temporary directory.  We start with using ln to create fast hardlinks.  If
+## that fails, GNU cp has annoying behavior where you can't copy multiple files
+## to the same target filename, so have to run cp for each input in a loop.
+## https://sourceware.org/PR28917
+libm.a: $(libm_a_OBJECTS) $(libm_a_DEPENDENCIES)
+	$(AM_V_at)rm -rf $@ $@.tmp && mkdir $@.tmp
+	$(AM_V_AR)if ! ln $(libm_a_OBJECTS) $@.tmp/ 2>/dev/null; then \
+	   rm -f $@.tmp/*; \
+	   for o in $(libm_a_OBJECTS); do cp $$o $@.tmp/ || exit $$?; done; \
+	   fi; \
+	   $(AR) $(ARFLAGS) $@ $@.tmp/*.o
+	$(AM_V_at)rm -rf $@.tmp
+	$(AM_V_at)$(RANLIB) $@
+
 if HAVE_MULTISUBDIR
 $(BUILD_MULTISUBDIR):
 	$(MKDIR_P) $@
diff --git a/newlib/Makefile.in b/newlib/Makefile.in
index 2b60ef1ca96c..84f3e0cbde37 100644
--- a/newlib/Makefile.in
+++ b/newlib/Makefile.in
@@ -3248,11 +3248,6 @@ libm/machine/x86_64/libm_a-fetestexcept.$(OBJEXT):  \
 libm/machine/x86_64/libm_a-feupdateenv.$(OBJEXT):  \
 	libm/machine/x86_64/$(am__dirstamp)
 
-libm.a: $(libm_a_OBJECTS) $(libm_a_DEPENDENCIES) $(EXTRA_libm_a_DEPENDENCIES) 
-	$(AM_V_at)-rm -f libm.a
-	$(AM_V_AR)$(libm_a_AR) libm.a $(libm_a_OBJECTS) $(libm_a_LIBADD)
-	$(AM_V_at)$(RANLIB) libm.a
-
 mostlyclean-compile:
 	-rm -f *.$(OBJEXT)
 	-rm -f libm/common/*.$(OBJEXT)
@@ -8650,6 +8645,16 @@ libg.a: libc.a
 	$(AM_V_GEN)ln libc.a libg.a >/dev/null 2>/dev/null || cp libc.a libg.a
 $(libm_a_OBJECTS): stmp-targ-include
 
+libm.a: $(libm_a_OBJECTS) $(libm_a_DEPENDENCIES)
+	$(AM_V_at)rm -rf $@ $@.tmp && mkdir $@.tmp
+	$(AM_V_AR)if ! ln $(libm_a_OBJECTS) $@.tmp/ 2>/dev/null; then \
+	   rm -f $@.tmp/*; \
+	   for o in $(libm_a_OBJECTS); do cp $$o $@.tmp/ || exit $$?; done; \
+	   fi; \
+	   $(AR) $(ARFLAGS) $@ $@.tmp/*.o
+	$(AM_V_at)rm -rf $@.tmp
+	$(AM_V_at)$(RANLIB) $@
+
 @HAVE_MULTISUBDIR_TRUE@$(BUILD_MULTISUBDIR):
 @HAVE_MULTISUBDIR_TRUE@	$(MKDIR_P) $@
 
-- 
2.34.1