[OE-core] [RFC][PATCH] gcc-configure: Pass distinct target flags

[Khem Raj]

When building gcc-cross-canadian libgcc is built using
headers from gcc-crosssdk and not the target sysroot
because we do not pass proper CFLAGS for target bits
so it ends up using CFLAGS that were meant for compiling
canadian gcc itself. It does not show up as a problem
when building SDK with eglibc because eglibc-nativesdk
and eglibc have identical headers. The problem shows
up clearly when you try to build uclibc based meta-toolchain
since then nativesdk libc and target libc are different

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 meta/recipes-devtools/gcc/gcc-configure-common.inc |    4 ++++
 meta/recipes-devtools/gcc/gcc-configure-cross.inc  |    4 ++++
 meta/recipes-devtools/gcc/gcc-configure-sdk.inc    |    6 +++++-
 3 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/meta/recipes-devtools/gcc/gcc-configure-common.inc b/meta/recipes-devtools/gcc/gcc-configure-common.inc
index 04eda9e..8ec8dd1 100644
--- a/meta/recipes-devtools/gcc/gcc-configure-common.inc
+++ b/meta/recipes-devtools/gcc/gcc-configure-common.inc
@@ -104,6 +104,10 @@ do_configure () {
 	export CXXFLAGS_FOR_BUILD="${BUILD_CXXFLAGS}"
 	export LDFLAGS_FOR_BUILD="${BUILD_LDFLAGS}"
 	export ARCH_FLAGS_FOR_TARGET="${ARCH_FLAGS_FOR_TARGET}"
+	export CFLAGS_FOR_TARGET="${TARGET_CFLAGS}"
+	export CPPFLAGS_FOR_TARGET="${TARGET_CPPFLAGS}"
+	export CXXFLAGS_FOR_TARGET="${TARGET_CXXFLAGS}"
+	export LDFLAGS_FOR_TARGET="${TARGET_LDFLAGS}"
 	(cd ${S} && gnu-configize) || die "failure running gnu-configize"
 
 	oe_runconf
diff --git a/meta/recipes-devtools/gcc/gcc-configure-cross.inc b/meta/recipes-devtools/gcc/gcc-configure-cross.inc
index 91834c2..65e340a 100644
--- a/meta/recipes-devtools/gcc/gcc-configure-cross.inc
+++ b/meta/recipes-devtools/gcc/gcc-configure-cross.inc
@@ -20,6 +20,10 @@ do_compile_prepend () {
 	export LD_FOR_TARGET="${TARGET_SYS}-ld"
 	export NM_FOR_TARGET="${TARGET_SYS}-nm"
 	export CC_FOR_TARGET="${CCACHE} ${TARGET_SYS}-gcc ${TARGET_CC_ARCH}"
+	export CFLAGS_FOR_TARGET="${TARGET_CFLAGS}"
+	export CPPFLAGS_FOR_TARGET="${TARGET_CPPFLAGS}"
+	export CXXFLAGS_FOR_TARGET="${TARGET_CXXFLAGS}"
+	export LDFLAGS_FOR_TARGET="${TARGET_LDFLAGS}"
 }
 
 LIBGCCS_VAR = "-lgcc_s"
diff --git a/meta/recipes-devtools/gcc/gcc-configure-sdk.inc b/meta/recipes-devtools/gcc/gcc-configure-sdk.inc
index 3043814..54e8ede 100644
--- a/meta/recipes-devtools/gcc/gcc-configure-sdk.inc
+++ b/meta/recipes-devtools/gcc/gcc-configure-sdk.inc
@@ -30,7 +30,7 @@ export WINDRES_FOR_TARGET = "${TARGET_PREFIX}windres"
 #
 # We need to override this and make sure the compiler can find staging
 #
-export ARCH_FLAGS_FOR_TARGET = "--sysroot=${STAGING_DIR_TARGET}"
+export ARCH_FLAGS_FOR_TARGET = "--sysroot=${STAGING_DIR_TARGET} -isystem =${target_includedir}"
 
 do_configure () {
 	export CC_FOR_BUILD="${BUILD_CC}"
@@ -39,6 +39,10 @@ do_configure () {
 	export CPPFLAGS_FOR_BUILD="${BUILD_CPPFLAGS}"
 	export CXXFLAGS_FOR_BUILD="${BUILD_CXXFLAGS}"
 	export LDFLAGS_FOR_BUILD="${BUILD_LDFLAGS}"
+	export CFLAGS_FOR_TARGET="${TARGET_CFLAGS}"
+	export CPPFLAGS_FOR_TARGET="${TARGET_CPPFLAGS}"
+	export CXXFLAGS_FOR_TARGET="${TARGET_CXXFLAGS}"
+	export LDFLAGS_FOR_TARGET="${TARGET_LDFLAGS}"
 	(cd ${S} && gnu-configize) || die "failure running gnu-configize"
 	oe_runconf
 }
-- 
1.7.5.4