http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51085
Bug #: 51085
Summary: "volatile const" structures (in C) go in the .data
section, not .rodata as expected
Classification: Unclassified
Product: gcc
Version: 4.6.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: etienne_lorr...@yahoo.fr
Basically, I was hoping (maybe my fault?) that "volatile const" data would go
to .rodata segment.
As described in the example for array1, that is not the case.
The example show array2, but to stop an asm message changing attribute of a
section I need the dirty trick of array3.
I did not noticed that with previous compiler version.
etienne@debian-testing:~/projet$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i486-linux-gnu/4.6/lto-wrapper
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.6.1-15'
--with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,go --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 --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-plugin --enable-objc-gc
--enable-targets=all --with-arch-32=i586 --with-tune=generic
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
--target=i486-linux-gnu
Thread model: posix
gcc version 4.6.1 (Debian 4.6.1-15)
etienne@debian-testing:~/projet$ cat text.c
volatile const unsigned array1[3] = { 1, 2, 3 };
volatile const unsigned array2[3] __attribute__ ((section(".rodata"))) = { 1,
2, 3 };
volatile const unsigned array3[3] __attribute__ ((section(".rodata #"))) = { 1,
2, 3 };
etienne@debian-testing:~/projet$ gcc -S text.c -o -
.file "text.c"
.globl array1
.data
.align 4
.type array1, @object
.size array1, 12
array1:
.long 1
.long 2
.long 3
.globl array2
.section .rodata,"aw",@progbits
.align 4
.type array2, @object
.size array2, 12
array2:
.long 1
.long 2
.long 3
.globl array3
.section .rodata #,"aw",@progbits
.align 4
.type array3, @object
.size array3, 12
array3:
.long 1
.long 2
.long 3
.ident "GCC: (Debian 4.6.1-15) 4.6.1"
.section .note.GNU-stack,"",@progbits
etienne@debian-testing:~/projet$
