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authorPeter A. Bigot <pab@pabigot.com>2014-08-14 14:05:59 -0500
committerRichard Purdie <richard.purdie@linuxfoundation.org>2014-08-15 18:19:52 +0100
commit0ba6ab39f187ecd4261f08e768f365f461384a3a (patch)
treed0263e22f4a97e2727ac777979be649d8ffe423f /meta/recipes-devtools/gcc/gcc-configure-common.inc
parent06f911894a367f395139c2b0d6c2ba6371398478 (diff)
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gcc: update compiler architecture to match gcc-runtime (armv6, armv7a)
The gcc-runtime recipe builds the gcc libraries including libstdc++ with $TARGET_CC_ARCH flags, which include -march=FOO flags that affect whether atomic instructions are available. This causes an ABI incompatibility when the compiler by default generates code for less capable architectures. For example, gcc-runtime libraries on a Cortex-A8 are built with a different C++11/C++14 mutex implementation than is used code compiled outside OE and without architecture-specific flags. This commit fixes the problem specifically for ABI issues related to atomic instructions available in ARMV6 and subsequent architectures. Other ABI incompatibilities may remain in other architectures. See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62100 Signed-off-by: Peter A. Bigot <pab@pabigot.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta/recipes-devtools/gcc/gcc-configure-common.inc')
-rw-r--r--meta/recipes-devtools/gcc/gcc-configure-common.inc7
1 files changed, 7 insertions, 0 deletions
diff --git a/meta/recipes-devtools/gcc/gcc-configure-common.inc b/meta/recipes-devtools/gcc/gcc-configure-common.inc
index 71dce12f45..48fb7995ca 100644
--- a/meta/recipes-devtools/gcc/gcc-configure-common.inc
+++ b/meta/recipes-devtools/gcc/gcc-configure-common.inc
@@ -64,6 +64,13 @@ EXTRA_OECONF_append_libc-uclibc = " --enable-__cxa_atexit"
EXTRA_OECONF_append_mips64 = " --with-abi=64 --with-arch-64=mips64 --with-tune-64=mips64"
EXTRA_OECONF_append_mips64el = " --with-abi=64 --with-arch-64=mips64 --with-tune-64=mips64"
+# ARMv6+ adds atomic instructions that affect the ABI in libraries built
+# with TUNE_CCARGS in gcc-runtime. Make the compiler default to a
+# compatible architecture. armv6 and armv7a cover the minimum tune
+# features used in OE.
+EXTRA_OECONF_append_armv6 = " --with-arch=armv6"
+EXTRA_OECONF_append_armv7a = " --with-arch=armv7-a"
+
EXTRA_OECONF_GCC_FLOAT ??= ""
CPPFLAGS = ""