### How to create bug situation.
[EMAIL PROTECTED]:~/code/test$ ls
q.c stable.h w.c
[EMAIL PROTECTED]:~/code/test$ cat stable.h
namespace {
int qwerty;
}
[EMAIL PROTECTED]:~/code/test$ cat q.c
#include "stable.h"
int main(){return 0;}
[EMAIL PROTECTED]:~/code/test$ cat w.c
#include "stable.h"
### Try to compile them
[EMAIL PROTECTED]:~/code/test$ g++ -c q.c && g++ -c w.c && g++ q.o w.o
[EMAIL PROTECTED]:~/code/test$ # Everything is allright.
### Now try to use precompiled headers
[EMAIL PROTECTED]:~/code/test$ g++ -x c++-header stable.h
[EMAIL PROTECTED]:~/code/test$ g++ -c q.c && g++ -c w.c && g++ q.o w.o
w.o:(.bss+0x0): multiple definition of `(anonymous namespace)::qwerty'
q.o:(.bss+0x0): first defined here
collect2: ld returned 1 exit status
[EMAIL PROTECTED]:~/code/test$ # It changes behavior!
### Verbose
[EMAIL PROTECTED]:~/code/test$ g++ --version
g++ (GCC) 4.1.1
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[EMAIL PROTECTED]:~/code/test$ g++ -x c++-header -v stable.h 2>&1 | less
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.1.1/configure --with-languages=c,c++,java
Thread model: posix
gcc version 4.1.1
/usr/local/libexec/gcc/i686-pc-linux-gnu/4.1.1/cc1plus -quiet -v -D_GNU_SOURCE
stable.h -quiet -dumpbase stable.h -mtune=pentiumpro -auxbase stable -version
-o
/tmp/ccJclyGu.s --output-pch=stable.h.gch
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory
"/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../..
/../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/qt/include
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1/i686-p
c-linux-gnu
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1/backwa
rd
/usr/local/include
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/include
/usr/include
End of search list.
GNU C++ version 4.1.1 (i686-pc-linux-gnu)
compiled by GNU C version 4.1.1.
GGC heuristics: --param ggc-min-expand=38 --param ggc-min-heapsize=15796
Compiler executable checksum: 0df7441bd54adeeb14f3ed5c0d3ee62c
g++ q.c w.c -v 2>&1 | less
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.1.1/configure --with-languages=c,c++,java
Thread model: posix
gcc version 4.1.1
/usr/local/libexec/gcc/i686-pc-linux-gnu/4.1.1/cc1plus -quiet -v -D_GNU_SOURCE
q.c -quiet -dumpbase q.c -mtune=pentiumpro -auxbase q -version -o
/tmp/cc5SON1S.
s
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory
"/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../..
/../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/qt/include
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1/i686-p
c-linux-gnu
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1/backwa
rd
/usr/local/include
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/include
/usr/include
End of search list.
GNU C++ version 4.1.1 (i686-pc-linux-gnu)
compiled by GNU C version 4.1.1.
GGC heuristics: --param ggc-min-expand=38 --param ggc-min-heapsize=15796
Compiler executable checksum: 0df7441bd54adeeb14f3ed5c0d3ee62c
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../i686-pc-linux-gnu/bin/as
-V -Qy -o /tmp/ccwwqFsN.o /tmp/cc5SON1S.s
GNU assembler version 2.17 (i686-pc-linux-gnu) using BFD version 2.17
/usr/local/libexec/gcc/i686-pc-linux-gnu/4.1.1/cc1plus -quiet -v -D_GNU_SOURCE
w.c -quiet -dumpbase w.c -mtune=pentiumpro -auxbase w -version -o
/tmp/cc5SON1S.
s
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory
"/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../..
/../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/qt/include
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1/i686-p
c-linux-gnu
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../include/c++/4.1.1/backwa
rd
/usr/local/include
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/include
/usr/include
End of search list.
GNU C++ version 4.1.1 (i686-pc-linux-gnu)
compiled by GNU C version 4.1.1.
GGC heuristics: --param ggc-min-expand=38 --param ggc-min-heapsize=15796
Compiler executable checksum: 0df7441bd54adeeb14f3ed5c0d3ee62c
/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../i686-pc-linux-gnu/bin/as
-V -Qy -o /tmp/ccO6zFNO.o /tmp/cc5SON1S.s
GNU assembler version 2.17 (i686-pc-linux-gnu) using BFD version 2.17
/usr/local/libexec/gcc/i686-pc-linux-gnu/4.1.1/collect2 --eh-frame-hdr -m
elf_i
386 -dynamic-linker /lib/ld-linux.so.2 /usr/lib/crt1.o /usr/lib/crti.o
/usr/loca
l/lib/gcc/i686-pc-linux-gnu/4.1.1/crtbegin.o
-L/usr/local/lib/gcc/i686-pc-linux-
gnu/4.1.1
-L/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../i686-pc-linux
-gnu/lib -L/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.1/../../.. /tmp/ccwwqFsN.o
/
tmp/ccO6zFNO.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/local/lib/gcc/i
686-pc-linux-gnu/4.1.1/crtend.o /usr/lib/crtn.o
/tmp/ccO6zFNO.o:(.bss+0x0): multiple definition of `(anonymous
namespace)::qwert
y'
/tmp/ccwwqFsN.o:(.bss+0x0): first defined here
collect2: ld returned 1 exit status
### Such structures are in use in boost/lambda/core.hpp header, and multi-unit
project ceases to link if precompiled headers are enabled (otherwise it works).
--
Summary: Turning on precompiled header with anonymous namespaces
spoils linking.
Product: gcc
Version: 4.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: pch
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: _vi at list dot ru
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=29085
