Bug#2493: GCC -O3 produces unsatisfied external ref to static function

[Ian Jackson <ian@chiark.chu.cam.ac.uk>]

Package: gcc
Version: 2.7.2-5

This bug is the one that the people have been seeing who have been
trying to compile dpkg using GCC 2.7.2 (ELF or M68K).

The next version of dpkg will not compile dselect/main.cc (the
problematic file) with -O3, instead using -O2 for most files, so this
will no longer be a problem for dpkg.

Ian.

-chiark:~/junk> cat t.cc
/**/
struct structure { void (*functionpointer)(void); };
static void function(void) { }
static const struct structure table[]= { function };
int main(void) { table[0].functionpointer(); }
-chiark:~/junk> g++ -O3 -v t.cc
 gcc -O3 -v t.cc -lg++ -lstdc++ -lm
Reading specs from /usr/lib/gcc-lib/i486-linux/2.7.2/specs
gcc version 2.7.2
 /usr/lib/gcc-lib/i486-linux/2.7.2/cpp -lang-c++ -v -undef -D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -D__GNUC_MINOR__=7 -D__ELF__ -Dunix -Di386 -Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__i386 -D__linux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386) -D__OPTIMIZE__ -D__i486__ t.cc /tmp/cca27459.ii
GNU CPP version 2.7.2 (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/g++-include
 /usr/local/include
 /usr/i486-linux/include
 /usr/lib/gcc-lib/i486-linux/2.7.2/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/i486-linux/2.7.2/cc1plus /tmp/cca27459.ii -quiet -dumpbase t.cc -O3 -version -o /tmp/cca27459.s
GNU C++ version 2.7.2 (i386 Linux/ELF) compiled by GNU C version 2.7.2.
 as -V -Qy -o /tmp/cca274591.o /tmp/cca27459.s
GNU assembler version 2.6 (i486-linux), using BFD version 2.6.0.2
 ld -m elf_i386 -dynamic-linker /lib/ld-linux.so.1 /usr/lib/crt1.o /usr/lib/crti.o /usr/lib/crtbegin.o -L/usr/lib/gcc-lib/i486-linux/2.7.2 /tmp/cca274591.o -lg++ -lstdc++ -lm -lgcc -lc -lgcc /usr/lib/crtend.o /usr/lib/crtn.o
/tmp/cca274591.o(.rodata+0x0): undefined reference to `function(void)'
-chiark:~/junk> dpkg -l gcc binutils
Desired=Unknown/Install/Remove/Purge
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name         Version   Rev  Description
+++-============-=========-====-===============================================
ii  gcc              2.7.2 5    The GNU C compiler (ELF version).
ii  binutils           2.6 2    The GNU assembler and binary utilities (ELF ver
-chiark:~/junk>