gcc-target: Fix libatomic dependency tracking issues

The --enable-dependency-tracking option was added to workaround build
issues in libatomic. This fixes that build problem properly and removes
the flag since the dependency tracking code appears to be full of races
which are much deeper and harder to fix.

As per the automake manual, dependency tracking is only useful and worth
the build performance cost if you are doing more than one compile of the same
source code which in most cases we are not so this is a good thing anyway.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

3 files changed, 43 insertions, 1 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-4.8.inc b/meta/recipes-devtools/gcc/gcc-4.8.inc
index 0fbbc1d9bc..4af98f8fee 100644
--- a/meta/recipes-devtools/gcc/gcc-4.8.inc
+++ b/meta/recipes-devtools/gcc/gcc-4.8.inc
@@ -75,6 +75,7 @@ SRC_URI = "${GNU_MIRROR}/gcc/gcc-${PV}/gcc-${PV}.tar.bz2 \
 	   file://0043-cpp.patch \
 	   file://0044-gengtypes.patch \
 	   file://0045-gcc-4.8-PR57717-PowerPC-E500v2.patch \
+	   file://0046-libatomic-deptracking.patch \
 	  "
 SRC_URI[md5sum] = "3b2386c114cd74185aa3754b58a79304"
 SRC_URI[sha256sum] = "545b44be3ad9f2c4e90e6880f5c9d4f0a8f0e5f67e1ffb0d45da9fa01bb05813"
diff --git a/meta/recipes-devtools/gcc/gcc-4.8/0046-libatomic-deptracking.patch b/meta/recipes-devtools/gcc/gcc-4.8/0046-libatomic-deptracking.patch
new file mode 100644
index 0000000000..6ea4f42765
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-4.8/0046-libatomic-deptracking.patch
@@ -0,0 +1,41 @@
+gcc 4.8 won't build with --disable-dependency-tracking since the *.Ppo files
+don't get created unless --enable-dependency-tracking is true.
+
+This patch ensures we only use those compiler options when its enabled.
+
+Upstream-Status: Submitted
+
+(Problem was already reported upstream, attached this patch there
+http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55930)
+
+RP 
+2012/09/22
+
+Index: gcc-4.8.1/libatomic/Makefile.am
+===================================================================
+--- gcc-4.8.1.orig/libatomic/Makefile.am	2013-01-14 18:16:23.000000000 +0000
++++ gcc-4.8.1/libatomic/Makefile.am	2013-09-22 10:38:18.904064750 +0000
+@@ -100,7 +100,8 @@
+ IFUNC_DEF	= -DIFUNC_ALT=$(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
+Index: gcc-4.8.1/libatomic/Makefile.in
+===================================================================
+--- gcc-4.8.1.orig/libatomic/Makefile.in	2013-05-31 09:09:26.000000000 +0000
++++ gcc-4.8.1/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 = $(PAT_BASE)_n.c
diff --git a/meta/recipes-devtools/gcc/gcc-target.inc b/meta/recipes-devtools/gcc/gcc-target.inc
index c7e3e164d8..e1179ac292 100644
--- a/meta/recipes-devtools/gcc/gcc-target.inc
+++ b/meta/recipes-devtools/gcc/gcc-target.inc
@@ -5,7 +5,7 @@ EXTRA_OECONF_PATHS = " \
     --with-sysroot=/ \
     --with-build-sysroot=${STAGING_DIR_TARGET} \
     --with-native-system-header-dir=${STAGING_DIR_TARGET}${target_includedir} \
-    --with-gxx-include-dir=${includedir}/c++/ --enable-dependency-tracking"
+    --with-gxx-include-dir=${includedir}/c++/"
 
 ARCH_FLAGS_FOR_TARGET += "-isystem${STAGING_INCDIR} -I${B}/gcc/include/ "