LTO with static libraries

[Sebastian Huber]

On 10/24/2011 07:06 PM, Ian Lance Taylor wrote:
> Which version of the linker are you using?  Can you try a newer version?

I used GNU Binutils 2.21.1 (the latest release).  I installed now 
2.21.53.20110922 (2.22 release branch).  This didn't work.  Then I checked the 
Binutils configure options and added "--enable-lto".

/home/sh/archive/binutils-2.21.53/configure --target=arm-rtemseabi4.11 
--prefix=/opt/rtems-4.11 --disable-nls --disable-win32-registry 
--disable-werror --enable-lto

With this I still get:

/home/sh/b-arm-gcc/gcc/xgcc -B/home/sh/b-arm-gcc/gcc/ 
/home/sh/archive/gcc-4.6-20111021-work/gcc/testsuite/gcc.c-torture/execute/builtins/20010124-1.c 
/home/sh/archive/gcc-4.6-20111021-work/gcc/testsuite/gcc.c-torture/execute/builtins/20010124-1-lib.c 
/home/sh/archive/gcc-4.6-20111021-work/gcc/testsuite/gcc.c-torture/execute/builtins/lib/main.c 
gcc_tg.o  -w  -O2 -flto -flto-partition=none  -DSTACK_SIZE=2048  -isystem 
/home/sh/b-arm-gcc/arm-rtemseabi4.11/./newlib/targ-include -isystem 
/home/sh/archive/gcc-4.6-20111021-work/newlib/libc/include -mcpu=arm7tdmi 
-B/home/sh/install-4.6-20111021/arm-rtemseabi4.11/edb7312/lib/ -specs bsp_specs 
-qrtems  -B/home/sh/b-arm-gcc/arm-rtemseabi4.11/./newlib/ 
-L/home/sh/b-arm-gcc/arm-rtemseabi4.11/./newlib 
/home/sh/b-arm-gcc/rtems_gcc_main.o  -Wl,-wrap,exit -Wl,-wrap,_exit 
-Wl,-wrap,main -Wl,-wrap,abort -lm   -o 
/home/sh/b-arm-gcc/gcc/testsuite/gcc/20010124-1.x6
/tmp/ccJbMxyE.lto.o: In function `memcpy':
ccKyOGEO.o:(.text+0x4): multiple definition of `memcpy'
/home/sh/b-arm-gcc/arm-rtemseabi4.11/./newlib/libc.a(lib_a-memcpy.o):/home/sh/archive/gcc-4.6-20111021-work/newlib/libc/string/memcpy.c:79: 
first defined here
collect2: ld returned 1 exit status

If I add "-Wl,--allow-multiple-definition" as suggested by Xunxun the link 
process succeeds.

-- 
Sebastian Huber, embedded brains GmbH

Address : Obere Lagerstr. 30, D-82178 Puchheim, Germany
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