gcc-runtime: Fix build when using gold

If gold is enabled as the default linker, it errors trying to link
to our dummy library empty file and this turns off things which should
be present in libstdc++.

For example, _GLIBCXX_HAVE_S_ISREG isn't defined and HAVE_S_ISREG in
libstdc++-v3/config.h isn't set properly.

Instead of just creating an empty file, create an empty elf binary
instead which addresses the issue.

(From OE-Core rev: 2070bcd10aa3a05c96c8501c6a8c1e129fb1d440)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-runtime.inc b/meta/recipes-devtools/gcc/gcc-runtime.inc
index c39a0caf8a..7e920df2d3 100644
--- a/meta/recipes-devtools/gcc/gcc-runtime.inc
+++ b/meta/recipes-devtools/gcc/gcc-runtime.inc
@@ -68,7 +68,8 @@ do_configure () {
         # libstdc++ isn't built yet so CXX would error not able to find it which breaks stdc++'s configure
         # tests. Create a dummy empty lib for the purposes of configure.
         mkdir -p ${WORKDIR}/dummylib
-        touch ${WORKDIR}/dummylib/libstdc++.so
+        touch ${WORKDIR}/dummylib/dummylib.c
+        ${CC} ${WORKDIR}/dummylib/dummylib.c -shared -o ${WORKDIR}/dummylib/libstdc++.so
         for d in libgcc ${RUNTIMETARGET}; do
                 echo "Configuring $d"
                 rm -rf ${B}/${TARGET_SYS}/$d/