gcc-runtime, libgcc: Symlink c++ header and startup files in target_triplet for SDK use

We build SDKs such that gcc-cross-candian is built for only one
target *-*-linux and then use -muclibc or -mmusl to let it compile
code for other libc variants. This works fine when libc = glibc
however it does not work for c++ programs when libc != glibc since
there are c++ headers installed under ${includedir}/c++/${BINV}/${TARGET_SYS}
which is fine when gcc-runtime and gcc-cross-candian uses same --target options
gxx includedir searches in right triplet, but it fails with musl/uclibc
since gcc will look for glibc based triplet but gcc-runtime will install
them under musl/uclibc triplet.

This patch symlinks the musl/uclibc triplet to glibc triplet when libc != glibc

This fixes SDKs for musl/uclibc

(From OE-Core rev: fcaaabb401fffcda4db9a7d1f927a2a404e4776d)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/libgcc.inc b/meta/recipes-devtools/gcc/libgcc.inc
index 68377869ca..4770394c42 100644
--- a/meta/recipes-devtools/gcc/libgcc.inc
+++ b/meta/recipes-devtools/gcc/libgcc.inc
@@ -2,6 +2,17 @@ require libgcc-common.inc
 
 DEPENDS = "virtual/${TARGET_PREFIX}gcc virtual/${TARGET_PREFIX}g++"
 
+do_install_append_class-target () {
+        if [ "${TCLIBC}" != "glibc" ]; then
+                case "${TARGET_OS}" in
+                        "linux-musl" | "linux-uclibc" | "linux-*spe") extra_target_os="linux";;
+                        "linux-musleabi" | "linux-uclibceabi") extra_target_os="linux-gnueabi";;
+                        *) extra_target_os="linux";;
+                esac
+                ln -s ${TARGET_SYS} ${D}${libdir}/${TARGET_ARCH}${TARGET_VENDOR}-$extra_target_os
+        fi
+}
+
 PACKAGES = "\
     ${PN} \
     ${PN}-dev \
@@ -19,6 +30,7 @@ FILES_${PN}-dev = "\
     ${base_libdir}/libgcc*.so \
     ${@base_conditional('BASETARGET_SYS', '${TARGET_SYS}', '', '${libdir}/${BASETARGET_SYS}', d)} \
     ${libdir}/${TARGET_SYS}/${BINV}* \
+    ${libdir}/${TARGET_ARCH}${TARGET_VENDOR}* \
 "
 
 LIBGCCBUILDTREENAME = "gcc-build-internal-"