http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56287
Bug #: 56287
Summary: __do_global_ctors_aux() crashing when LTO enabled with
flto-partition=none
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: honyake...@centrum.cz
Hi,
I am using gcc 4.7.2 under cygwin
Using built-in specs.
COLLECT_GCC=./powerpc-unknown-eabi-gcc-4.7.2
COLLECT_LTO_WRAPPER=/home/JKe/cross/libexec/gcc/powerpc-unknown-eabi/4.7.2/lto-w
rapper.exe
Target: powerpc-unknown-eabi
Configured with: .......
Tmp/cross-toolchain-mpc8xx-eabi-tmp/gcc-4.7.2/configure
--enable-languages=c,c++ --config-cache --prefix=/h
ome/JKe/cross --target=powerpc-unknown-eabi --with-cpu=860 --without-fp
--with-f
loat=soft --disable-nls --disable-shared --disable-libssp --disable-libgomp
--di
sable-libmudflap --disable-libquadmath --disable-multilib
--disable-decimal-floa
t --disable-fixed-point --enable-threads=posix --with-newlib --with-gnu-ld
--wit
h-gnu-as --enable-lto
Thread model: posix
gcc version 4.7.2 (GCC)
when I enable compilation/linking with LTO partitioning NONE, the .ctors
constructor table gets somehow damaged. The symbol __CTOR_END__ points before
the __CTOR_LIST__!!! Therefore the __do_global_ctors_aux() function is
crashing.
Here is an example:
Compiler flags : -O2 -flto -fdata-sections -ffunction-sections
-mno-strict-align -g3 -Wall -Wpointer-arith -Wwrite-strings -Wunused-parameter
-Wextra -DHAVE_SNPRINTF -Wformat -Wformat-security -fcheck-new
-Wnon-virtual-dtor -Wctor-dtor-privacy -mno-relocatable -mno-relocatable-lib
-mcpu=860 -meabi -msdata=sysv -fno-exceptions
A) Crashing configuration
Linker flags: -Wl,--gc-sections -Wl,-flto=jobserver -flto-partition=none -O2
-static
.ctor table from .map file
**************************
.ctors 0x00186950 0x14
*crtbegin.o(.ctors)
*crtbegin?.o(.ctors)
*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
.ctors 0x00186950 0x0
/home/JKe/cross/lib/gcc/powerpc-unknown-eabi/4.7.2/ecrti.o
0x00186950 __CTOR_LIST__
.ctors 0x00186950 0xc
/cygdrive/c/Users/JKe/AppData/Local/Temp/ccT7Msbu.lto.o
.ctors 0x0018695c 0x4
/home/JKe/cross/lib/gcc/powerpc-unknown-eabi/4.7.2/../../../../powerpc-unknown-eabi/lib/libstdc++.a(eh_alloc.o)
.ctors 0x00186960 0x4
/home/JKe/cross/lib/gcc/powerpc-unknown-eabi/4.7.2/../../../../powerpc-unknown-eabi/lib/libstdc++.a(eh_globals.o)
.ctors 0x00186964 0x0
/home/JKe/cross/lib/gcc/powerpc-unknown-eabi/4.7.2/ecrtn.o
0x00186964 __CTOR_END__
*(SORT(.ctors.*))
*(.ctors)
__CTOR Symbols using objdump tool (note that local are used in reality)
*********************************
00186958 l O .ctors 00000004 __CTOR_LIST__.1431
00186954 l O .ctors 00000004 __CTOR_END__.585871
00186950 g O .ctors 00000000 __CTOR_LIST__
00186964 g O .ctors 00000000 __CTOR_END__
B) Not crashing configuration (using default LTO partitioning)
Linker flags: -Wl,--gc-sections -Wl,-flto=jobserver -O2 -static
.ctor table from .map file
**************************
.ctors 0x00187a70 0x14
*crtbegin.o(.ctors)
*crtbegin?.o(.ctors)
*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
.ctors 0x00187a70 0x0
/home/JKe/cross/lib/gcc/powerpc-unknown-eabi/4.7.2/ecrti.o
0x00187a70 __CTOR_LIST__
.ctors 0x00187a70 0x4
/cygdrive/c/Users/JKe/AppData/Local/Temp/ccYYi7V7.ltrans24.ltrans.o
.ctors 0x00187a74 0x8
/cygdrive/c/Users/JKe/AppData/Local/Temp/ccYYi7V7.ltrans25.ltrans.o
.ctors 0x00187a7c 0x4
/home/JKe/cross/lib/gcc/powerpc-unknown-eabi/4.7.2/../../../../powerpc-unknown-eabi/lib/libstdc++.a(eh_alloc.o)
.ctors 0x00187a80 0x4
/home/JKe/cross/lib/gcc/powerpc-unknown-eabi/4.7.2/../../../../powerpc-unknown-eabi/lib/libstdc++.a(eh_globals.o)
.ctors 0x00187a84 0x0
/home/JKe/cross/lib/gcc/powerpc-unknown-eabi/4.7.2/ecrtn.o
0x00187a84 __CTOR_END__
*(SORT(.ctors.*))
*(.ctors)
__CTOR Symbols using objdump tool (note that local are used in reality)
*********************************
00187a70 l O .ctors 00000004 __CTOR_LIST__.1431.20271
00187a78 l O .ctors 00000004 __CTOR_END__.603481.26462
00187a70 g O .ctors 00000000 __CTOR_LIST__
00187a84 g O .ctors 00000000 __CTOR_END__
