configure: Use -print-libgcc-file-name first to detect compiler runtime

This uses compiler to provide the path to its default runtime
library libgcc/compiler-rt, when using clang we can set

CC="clang --rtlib={compiler-rt|libgcc}" and it will find
the right compiler runtime when autodetecting it

Signed-off-by: Khem Raj <[email protected]>

Author: kraj

configure

@@ -615,10 +615,10 @@ tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
 tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list"
 
 # Find compiler runtime library
-test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
-test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
                  && tryldflag LIBCC "$try_libcc"
+test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
+test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
                  && tryldflag LIBCC "$try_libcc"
 printf "using compiler runtime libraries: %s\n" "$LIBCC"