http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54068
Bug #: 54068
Summary: Compiler passes wrong argument to function when using
-O3 and inline
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: vog...@gmail.com
Created attachment 27855
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27855
Compile this ii file and run it; it shows the described problem
In the attached example, gcc passes the wrong parameter to a function. The
problem only was observed on a Ubuntu 12.04 i386 platform. It did not occur
not on Ubuntu 12.04 amd64.
The problem can be avoided by a) omitting the inline statement or b) by
commenting out the optimisation attribute in the source code.
Here's the output of gcc -v -save-temps -o it it.cpp
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.6/lto-wrapper
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --enable-targets=all --disable-werror
--with-arch-32=i686 --with-tune=generic --enable-checking=release
--build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu
Thread model: posix
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-o' 'it' '-mtune=generic' '-march=i686'
/usr/lib/gcc/i686-linux-gnu/4.6/cc1plus -E -quiet -v -imultilib . -imultiarch
i386-linux-gnu -D_GNU_SOURCE it.cpp -mtune=generic -march=i686 -fpch-preprocess
-fstack-protector -o it.ii
ignoring nonexistent directory "/usr/local/include/i386-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i686-linux-gnu/4.6/../../../../i686-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.6
/usr/include/c++/4.6/i686-linux-gnu/.
/usr/include/c++/4.6/backward
/usr/lib/gcc/i686-linux-gnu/4.6/include
/usr/local/include
/usr/lib/gcc/i686-linux-gnu/4.6/include-fixed
/usr/include/i386-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-o' 'it' '-mtune=generic' '-march=i686'
/usr/lib/gcc/i686-linux-gnu/4.6/cc1plus -fpreprocessed it.ii -quiet -dumpbase
it.cpp -mtune=generic -march=i686 -auxbase it -version -fstack-protector -o
it.s
GNU C++ (Ubuntu/Linaro 4.6.3-1ubuntu5) version 4.6.3 (i686-linux-gnu)
compiled by GNU C version 4.6.3, GMP version 5.0.2, MPFR version 3.1.0-p3,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=89 --param ggc-min-heapsize=111959
GNU C++ (Ubuntu/Linaro 4.6.3-1ubuntu5) version 4.6.3 (i686-linux-gnu)
compiled by GNU C version 4.6.3, GMP version 5.0.2, MPFR version 3.1.0-p3,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=89 --param ggc-min-heapsize=111959
Compiler executable checksum: 2ed62271b86e2b75137544459bab1a81
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-o' 'it' '-mtune=generic' '-march=i686'
as --32 -o it.o it.s
COMPILER_PATH=/usr/lib/gcc/i686-linux-gnu/4.6/:/usr/lib/gcc/i686-linux-gnu/4.6/:/usr/lib/gcc/i686-linux-gnu/:/usr/lib/gcc/i686-linux-gnu/4.6/:/usr/lib/gcc/i686-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/i686-linux-gnu/4.6/:/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/:/usr/lib/gcc/i686-linux-gnu/4.6/../../../../lib/:/lib/i386-linux-gnu/:/lib/../lib/:/usr/lib/i386-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/i686-linux-gnu/4.6/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-o' 'it' '-mtune=generic' '-march=i686'
/usr/lib/gcc/i686-linux-gnu/4.6/collect2 --sysroot=/ --build-id
--no-add-needed --as-needed --eh-frame-hdr -m elf_i386 --hash-style=gnu
-dynamic-linker /lib/ld-linux.so.2 -z relro -o it
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crt1.o
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crti.o
/usr/lib/gcc/i686-linux-gnu/4.6/crtbegin.o -L/usr/lib/gcc/i686-linux-gnu/4.6
-L/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu
-L/usr/lib/gcc/i686-linux-gnu/4.6/../../../../lib -L/lib/i386-linux-gnu
-L/lib/../lib -L/usr/lib/i386-linux-gnu -L/usr/lib/../lib
-L/usr/lib/gcc/i686-linux-gnu/4.6/../../.. it.o -lgcc --as-needed -lgcc_s
--no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/i686-linux-gnu/4.6/crtend.o
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crtn.o
