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| author | Peter A. Bigot <pab@pabigot.com> | 2014-08-14 14:05:59 -0500 |
|---|---|---|
| committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2014-08-15 18:19:52 +0100 |
| commit | 0ba6ab39f187ecd4261f08e768f365f461384a3a (patch) | |
| tree | d0263e22f4a97e2727ac777979be649d8ffe423f /meta/recipes-devtools | |
| parent | 06f911894a367f395139c2b0d6c2ba6371398478 (diff) | |
| download | openembedded-core-0ba6ab39f187ecd4261f08e768f365f461384a3a.tar.gz openembedded-core-0ba6ab39f187ecd4261f08e768f365f461384a3a.tar.bz2 openembedded-core-0ba6ab39f187ecd4261f08e768f365f461384a3a.zip | |
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')
| -rw-r--r-- | meta/recipes-devtools/gcc/gcc-configure-common.inc | 7 |
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 = "" |