The following example(reduced from glibc) compiles differently for ppc target
when using gcc 4.2 as compared to gcc 4.1
It generates the alias symbol as a real symbol instead of creating it as alias.
I get this correct using gcc 4.2 for arm so the problem seems to be affecting
only ppc. This also works ok with gcc 4.1
to reproduce compile the example with -O2
testcase.c
========================================================
extern char **_dl_argv
__attribute__ ((section (".data.rel.ro")))
;
extern char **_dl_argv_internal __attribute__ ((visibility ("hidden")))
__attribute__ ((section (".data.rel.ro")))
;
char **_dl_argv __attribute__ ((section (".data.rel.ro"))) = ((void *)0);
extern __typeof (_dl_argv) _dl_argv_internal __attribute__ ((alias
("_dl_argv")));
char* foo (){
return _dl_argv_internal[0];
}
=====================================
glibc segfaults in ld.so currently when compiled with gcc 4.2 for ppc due to
this issue.
--
Summary: gcc generate incorrect alias symbols for PPC
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: raj dot khem at gmail dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: powerpc-*-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29943
