recipes: Link with libgcc when building static versions on arm

since llvm libunwind does not provide all the symbols that
glibc/libpthread expects when doing static linking it fails with
some undefined symbols e.g.

/usr/src/debug/glibc/2.29-r0/git/nptl/unwind.c:121: undefined reference to `_Unwind_ForcedUnwind'

which is found in libgcc_s.so, ideally one day clang unwind library
should get there

this is only an issue on glibc, musl works ok

Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/conf/nonclangable.conf b/conf/nonclangable.conf
index 073004e..bcf9add 100644
--- a/conf/nonclangable.conf
+++ b/conf/nonclangable.conf
@@ -187,3 +187,10 @@ TUNE_CCARGS_remove_pn-omxplayer_toolchain-clang = "-no-integrated-as"
 #| clang-7: error: linker command failed with exit code 1 (use -v to see invocation)
 LDFLAGS_append_pn-ruby_toolchain-clang = " -rtlib=compiler-rt"
 LDFLAGS_append_pn-m4_toolchain-clang = " -rtlib=compiler-rt"
+
+#(unwind.o): in function `__pthread_unwind':
+#/usr/src/debug/glibc/2.29-r0/git/nptl/unwind.c:121: undefined reference to `_Unwind_ForcedUnwind'
+#clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
+COMPILER_RT_pn-libc-bench_libc-glibc_toolchain_clang_arm = "--rtlib=libgcc"
+COMPILER_RT_pn-aufs-util_libc-glibc_toolchain_clang_arm = "--rtlib=libgcc"
+COMPILER_RT_pn-libhugetlbfs_libc-glibc_toolchaon-clang_arm = "--rtlib=libgcc"