[Bug c/32434] New: #pragma GCC visibility causes invalid relocation to __stach_chk_guard

[Bug c/32434] New: #pragma GCC visibility causes invalid relocation to __stach_chk_guard

[equinox-gccbug at diac24 dot net]

When using, e.g., #pragma GCC visibility push(internal) together with
-fstack-protector and PIC code, gcc emits an invalid R_386_GOTOFF relocation to
__stack_chk_guard.

(Testcase follows)

Note that the problem does not happen with -fvisibility,
__attribute__((visibility)) or when there is a reference to __stack_chk_guard
before the #pragma.


-- 
           Summary: #pragma GCC visibility causes invalid relocation to
                    __stach_chk_guard
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: equinox-gccbug at diac24 dot net
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32434

[Bug c/32434] #pragma GCC visibility causes invalid relocation to __stach_chk_guard

[equinox-gccbug at diac24 dot net]

------- Comment #1 from equinox-gccbug at diac24 dot net  2007-06-20 17:50 -------
Created an attachment (id=13748)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13748&action=view)
Test source

Try with different flags as shown in test.sh


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32434

[Bug c/32434] #pragma GCC visibility causes invalid relocation to __stach_chk_guard

[equinox-gccbug at diac24 dot net]

------- Comment #2 from equinox-gccbug at diac24 dot net  2007-06-20 17:51 -------
Created an attachment (id=13749)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13749&action=view)
Script for compiling test.c with different flags

# sh ./test.sh
-fno-stack-protector : 
-fno-stack-protector -fvisibility=internal: 
-fno-stack-protector -DVIS_ATTR: 
-fno-stack-protector -DVIS_PRAGMA: 
-fno-stack-protector -DVIS_PRAGMA -DREF_BEFORE: 
-fstack-protector-all : 
-fstack-protector-all -fvisibility=internal: 
-fstack-protector-all -DVIS_ATTR: 
-fstack-protector-all -DVIS_PRAGMA: 
/usr/lib/gcc/i686-colt-linux-gnu/4.1.2/../../../../i686-colt-linux-gnu/bin/ld:
/tmp/ccHCfgCk.o(.text+0x14): unresolvable relocation against symbol
`__stack_chk_guard@@LIBSSP_1.0'
/usr/lib/gcc/i686-colt-linux-gnu/4.1.2/../../../../i686-colt-linux-gnu/bin/ld:
final link failed: Nonrepresentable section on output
collect2: ld returned 1 exit status
-fstack-protector-all -DVIS_PRAGMA -DREF_BEFORE: 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32434

[Bug c/32434] #pragma GCC visibility causes invalid relocation to __stach_chk_guard

[equinox-gccbug at diac24 dot net]

------- Comment #3 from equinox-gccbug at diac24 dot net  2007-06-20 17:54 -------
# gcc -v
Using built-in specs.
Target: i686-colt-linux-gnu
Configured with: ../gcc-4.1.2/configure --prefix=/usr --infodir=/usr/share/info
--mandir=/usr/share/man --build=i686-colt-linux-gnu --host=i686-colt-linux-gnu
--target=i686-colt-linux-gnu --enable-libssp --enable-shared
--enable-__cxa_atexit --enable-threads=posix --libexecdir=/usr/lib
--enable-clocale --enable-languages=c,c++,objc,obj-c++ --enable-multilib=no
Thread model: posix
gcc version 4.1.2
# uname -a
Linux neptune 2.6.22-rc4 #19 PREEMPT Sat Jun 9 18:51:59 CEST 2007 i686 athlon-4
i386 GNU/Linux
# /lib/libc.so.6 | grep 'GNU C'
GNU C Library stable release version 2.3.6, by Roland McGrath et al.
Compiled by GNU CC version 4.1.0 colt stage0.

cmdline / output see test.sh.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32434

[Bug c/32434] #pragma GCC visibility causes invalid relocation to __stach_chk_guard

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2007-06-20 20:53 -------
Related to PR 20297.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |20297


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32434