cc/gcc: modify to build gcc-4.8-based cross-tools

[Jongsung Kim]

Building cross-tool based on gcc-4.8 fails while "Installing
pass-2 core C compiler", because building libgcc.mvars needs
libbacktrace.a that gcc.sh doesn't build. This patch inserts
a few lines configuring, and making libbacktrace into gcc.sh
to build gcc-4.8-based cross-tools successfully.

Signed-off-by: Jongsung Kim <neidhard.kim@lge.com>
---
 scripts/build/cc/gcc.sh |  5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/scripts/build/cc/gcc.sh b/scripts/build/cc/gcc.sh
--- a/scripts/build/cc/gcc.sh
+++ b/scripts/build/cc/gcc.sh
@@ -409,6 +409,11 @@ do_cc_core_backend() {
             CT_DoExecLog CFG make ${JOBSFLAGS} configure-libdecnumber
             CT_DoExecLog ALL make ${JOBSFLAGS} -C libdecnumber libdecnumber.a
         fi
+        # HACK: gcc-4.8 uses libbacktrace to make libgcc.mvars, so make it here.
+        if [ -d "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/libbacktrace" ]; then
+            CT_DoExecLog CFG make ${JOBSFLAGS} configure-libbacktrace
+            CT_DoExecLog ALL make ${JOBSFLAGS} -C libbacktrace
+        fi
 
         # Starting with GCC 4.3, libgcc.mk is no longer built,
         # and libgcc.mvars is used instead.
--

--
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