http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56512
Bug #: 56512
Summary: Memory corruption when compiling code with -O on
PowerPC when using setjmp/longjmp
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: erik.bra...@gmx.de
Created attachment 29570
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29570
preproccessed file of the code, fails on -O (but not on -O0 or -O2)
The code from the attached file (adapted from a Wikipedia example) shows the
following (correct) output on -O0 and -O2:
Child loop begin
Parent
Child loop end
Parent
The output on -O is:
Child loop begin
Parent
��g
Parent
The third line is different every time, so I suspect it's some garbage from
memory.
The output of gcc -v is:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/powerpc-linux-gnu/4.7/lto-wrapper
Target: powerpc-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.7.2-19ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm
--enable-plugin --with-system-zlib --enable-objc-gc --enable-secureplt
--disable-softfloat --with-cpu=default32 --disable-softfloat
--enable-targets=powerpc-linux,powerpc64-linux --enable-multiarch
--disable-werror --with-long-double-128 --enable-checking=release
--build=powerpc-linux-gnu --host=powerpc-linux-gnu --target=powerpc-linux-gnu
Thread model: posix
gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-19ubuntu1)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O'
/usr/lib/gcc/powerpc-linux-gnu/4.7/cc1 -E -quiet -v -imultilib . -imultiarch
powerpc-linux-gnu -D__unix__ -D__gnu_linux__ -D__linux__ -Dunix -D__unix
-Dlinux -D__linux -Asystem=linux -Asystem=unix -Asystem=posix
powerPCSetjmpLongjmpCorruption.c -msecure-plt -O -fpch-preprocess
-fstack-protector -o powerPCSetjmpLongjmpCorruption.i
ignoring nonexistent directory "/usr/local/include/powerpc-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../../powerpc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/powerpc-linux-gnu/4.7/include
/usr/local/include
/usr/lib/gcc/powerpc-linux-gnu/4.7/include-fixed
/usr/include/powerpc-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O'
/usr/lib/gcc/powerpc-linux-gnu/4.7/cc1 -fpreprocessed
powerPCSetjmpLongjmpCorruption.i -msecure-plt -quiet -dumpbase
powerPCSetjmpLongjmpCorruption.c -auxbase powerPCSetjmpLongjmpCorruption -O
-version -fstack-protector -o powerPCSetjmpLongjmpCorruption.s
GNU C (Ubuntu/Linaro 4.7.2-19ubuntu1) version 4.7.2 (powerpc-linux-gnu)
compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version 3.1.0-p10,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C (Ubuntu/Linaro 4.7.2-19ubuntu1) version 4.7.2 (powerpc-linux-gnu)
compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version 3.1.0-p10,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 674c851c1ddb45d49217fc2d358e8b83
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O'
as -v -a32 -mppc -many -o powerPCSetjmpLongjmpCorruption.o
powerPCSetjmpLongjmpCorruption.s
GNU assembler version 2.23.1 (powerpc-linux-gnu) using BFD version (GNU
Binutils for Ubuntu) 2.23.1
COMPILER_PATH=/usr/lib/gcc/powerpc-linux-gnu/4.7/:/usr/lib/gcc/powerpc-linux-gnu/4.7/:/usr/lib/gcc/powerpc-linux-gnu/:/usr/lib/gcc/powerpc-linux-gnu/4.7/:/usr/lib/gcc/powerpc-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/powerpc-linux-gnu/4.7/:/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../powerpc-linux-gnu/:/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../../lib/:/lib/powerpc-linux-gnu/:/lib/../lib/:/usr/lib/powerpc-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O'
/usr/lib/gcc/powerpc-linux-gnu/4.7/collect2 --sysroot=/ --build-id
--eh-frame-hdr -V -m elf32ppclinux --hash-style=gnu --as-needed -dynamic-linker
/lib/ld.so.1 -z relro
/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../powerpc-linux-gnu/crt1.o
/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../powerpc-linux-gnu/crti.o
/usr/lib/gcc/powerpc-linux-gnu/4.7/crtbegin.o
-L/usr/lib/gcc/powerpc-linux-gnu/4.7
-L/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../powerpc-linux-gnu
-L/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../../lib -L/lib/powerpc-linux-gnu
-L/lib/../lib -L/usr/lib/powerpc-linux-gnu -L/usr/lib/../lib
-L/usr/lib/gcc/powerpc-linux-gnu/4.7/../../.. powerPCSetjmpLongjmpCorruption.o
-lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
--no-as-needed /usr/lib/gcc/powerpc-linux-gnu/4.7/crtend.o
/usr/lib/gcc/powerpc-linux-gnu/4.7/../../../powerpc-linux-gnu/crtn.o
GNU ld (GNU Binutils for Ubuntu) 2.23.1
Supported emulations:
elf32ppclinux
elf32ppc
elf32ppcsim
elf64ppc
elf32_spu
