build: don't add -fno-plt for ARC

Curent ARC toolchain fails to build libstdc++ if -fno-plt is used.
Lots of following error messages appear:
------------------->8------------------
...
staging_dir/toolchain-arc_arc700_gcc-arc-2015.06_uClibc-1.0.9/arc-openwrt-linux-uclibc/bin/ld:
BFD (GNU Binutils) 2.23.2 assertion fail elf32-arc.c:2786
collect2: error: ld returned 1 exit status
------------------->8------------------

In newer binutils (still in development) for ARC rewritten from
scratch this seem to not happen, so once new binutils for ARC hit
the street this patch might be reverted.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Jo-Philipp Wich <jow@openwrt.org>
Cc: Jonas Gorski <jogo@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48642 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/config/Config-devel.in b/config/Config-devel.in
index 5970ac2..938f0b3 100644 (file)
--- a/config/Config-devel.in
+++ b/config/Config-devel.in
@@ -106,7 +106,7 @@ menuconfig DEVEL
 
        config EXTRA_OPTIMIZATION
                string "Additional compiler options" if DEVEL
-               default "-fno-caller-saves -fno-plt" if !CONFIG_EXTERNAL_TOOLCHAIN
+               default "-fno-caller-saves -fno-plt" if !CONFIG_EXTERNAL_TOOLCHAIN && !arc
                default "-fno-caller-saves"
                help
                  Extra target-independent optimizations to use when building for the target.