Hi, I stumbled across an issue recently building gcc and libatomic with --disable-dependency-tracking (in a cross-compiler). It turns out there's an open bug with a patch by Richard Purdie for that at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55930 and the patch appears to work fine, on gcc 6.2.0:
--- gcc-4.8.1.orig/libatomic/Makefile.am 2013-01-14 18:16:23.000000000 +0000 +++ gcc-4.8.1.orig/libatomic/Makefile.am 2013-09-22 10:38:18.904064750 +0000 @@ -100,7 +100,8 @@ IFUNC_DEF = -DIFUNC_ALT=$(PAT_S) IFUNC_OPT = $(word $(PAT_S),$(IFUNC_OPTIONS)) -M_DEPS = -MT $@ -MD -MP -MF $(DEPDIR)/$(@F).Ppo +@AMDEP_TRUE@M_DEPS = -MT $@ -MD -MP -MF $(DEPDIR)/$(@F).Ppo +@AMDEP_FALSE@M_DEPS = M_SIZE = -DN=$(PAT_N) M_IFUNC = $(if $(PAT_S),$(IFUNC_DEF) $(IFUNC_OPT)) M_FILE = $(PAT_BASE)_n.c --- gcc-4.8.1.orig/libatomic/Makefile.in 2013-05-31 09:09:26.000000000 +0000 +++ gcc-4.8.1.orig/libatomic/Makefile.in 2013-09-22 10:40:42.520059917 +0000 @@ -298,7 +298,8 @@ PAT_S = $(word 3,$(PAT_SPLIT)) IFUNC_DEF = -DIFUNC_ALT=$(PAT_S) IFUNC_OPT = $(word $(PAT_S),$(IFUNC_OPTIONS)) -M_DEPS = -MT $@ -MD -MP -MF $(DEPDIR)/$(@F).Ppo +@AMDEP_TRUE@M_DEPS = -MT $@ -MD -MP -MF $(DEPDIR)/$(@F).Ppo +@AMDEP_FALSE@M_DEPS = M_SIZE = -DN=$(PAT_N) M_IFUNC = $(if $(PAT_S),$(IFUNC_DEF) $(IFUNC_OPT)) M_FILE = $(PAT_BASE)_n.c Is the patch suitable for merging? Thanks, Stephen
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