http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47891
Summary: GCC 4.6 LTO not worked reliable on Windows target
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: dongsheng.s...@gmail.com
Created attachment 23464
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23464
exe file which have invalid address reference to _puts
I have test LTO with hello.cpp and hello.c, testing on hello.cpp passed,
testing on hello.c sucks with:
Program received signal SIGSEGV, Segmentation fault.
Here is gcc and binutils version information:
$ i686-w64-mingw32-ld -v
GNU ld (GNU Binutils) 2.21.51.20110225
$ i686-w64-mingw32-gcc -v
Using built-in specs.
COLLECT_GCC=i686-w64-mingw32-gcc
COLLECT_LTO_WRAPPER=/home/oracle/gcc-4.6-windows_i686-linux/libexec/gcc/i686-w64-mingw32/4.6.0/lto-wrapper
Target: i686-w64-mingw32
Configured with: /home/oracle/vcs/svn/gcc/trunk/configure
--prefix=/home/oracle/gcc-4.6-windows_i686-linux
--with-sysroot=/home/oracle/gcc-4.6-windows_i686-linux
--build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --target=i686-w64-mingw32
--enable-targets=all --with-arch-32=x86-64 --with-tune-32=generic
--with-arch-64=x86-64 --with-tune-64=generic --with-fpmath=sse
--enable-fully-dynamic-string --disable-nls
--enable-languages=c,c++,fortran,objc,obj-c++ --enable-libgomp --enable-libssp
--enable-lto --enable-cloog-backend=ppl-legacy
Thread model: win32
gcc version 4.6.0 20110224 (experimental) (GCC)
With LTO, the generated exe file have invalid address reference to _puts:
$ i686-w64-mingw32-gcc -g -flto -o hello.c.lto.exe Hello.c
$ i686-w64-mingw32-objdump -d hello.c.lto.exe
00402430 <_main>:
402430: 55 push %ebp
402431: 89 e5 mov %esp,%ebp
402433: 83 e4 f0 and $0xfffffff0,%esp
402436: 83 ec 10 sub $0x10,%esp
402439: e8 02 fb ff ff call 401f40 <___main>
40243e: c7 04 24 94 42 40 00 movl $0x404294,(%esp)
402445: e8 b6 db bf ff call 0 <_puts>
40244a: b8 00 00 00 00 mov $0x0,%eax
40244f: c9 leave
402450: c3 ret
402451: 90 nop
402452: 90 nop
402453: 90 nop
With LTO, it's OK:
$ i686-w64-mingw32-gcc -g -o hello.c.exe Hello.c
$ i686-w64-mingw32-objdump -d hello.c.exe
004015f0 <_main>:
4015f0: 55 push %ebp
4015f1: 89 e5 mov %esp,%ebp
4015f3: 83 e4 f0 and $0xfffffff0,%esp
4015f6: 83 ec 10 sub $0x10,%esp
4015f9: e8 72 09 00 00 call 401f70 <___main>
4015fe: c7 04 24 68 40 40 00 movl $0x404068,(%esp)
401605: e8 fe 0d 00 00 call 402408 <_puts>
40160a: b8 00 00 00 00 mov $0x0,%eax
40160f: c9 leave
401610: c3 ret
401611: 90 nop
401612: 90 nop
401613: 90 nop
I checked GCC 4.5.3 20110224 with same binutils version, it works fine.
