From 0ba6ab39f187ecd4261f08e768f365f461384a3a Mon Sep 17 00:00:00 2001 From: "Peter A. Bigot" Date: Thu, 14 Aug 2014 14:05:59 -0500 Subject: 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 Signed-off-by: Richard Purdie --- meta/recipes-devtools/gcc/gcc-configure-common.inc | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'meta/recipes-devtools') 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 = "" -- cgit 1.2.3-korg