[Bug c++/23472] New: __attribute__((constructor)) called twice with -funit-at-a-time

["flash at pobox dot com" <gcc-bugzilla at gcc dot gnu dot org>]

The constructor in the code for bug 16717 (below) gets called twice when compiled by 3.3.4 with -
funit-at-a-time, but only once when called without -funit-at-a-time.  This sounds like the opposite of 
bug 16717, which was marked as a 3.4 regression, and supposedly not a problem in 3.3.4.


#include <stdio.h>

void hello (void) __attribute__ ((constructor));

void hello (void) { printf ("Hello world\n"); }

int main (void) { return 0; }


Here's the session:

 flash@thrallis scripts 18:00:33
81> /usr/bin/g++ -v -funit-at-a-time ../cpp/bugfiles/GCC_bugfiles/noerror/16717-attr-
constructor.cpp
Reading specs from /usr/lib/gcc-lib/i586-suse-linux/3.3.4/specs
Configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --
infodir=/usr/share/info --mandir=/usr/share/man --enable-languages=c,c++,f77,objc,java,ada --
disable-checking --libdir=/usr/lib --enable-libgcj --with-gxx-include-dir=/usr/include/g++ --with-
slibdir=/lib --with-system-zlib --enable-shared --enable-__cxa_atexit i586-suse-linux
Thread model: posix
gcc version 3.3.4 (pre 3.3.5 20040809)
 /usr/lib/gcc-lib/i586-suse-linux/3.3.4/cc1plus -quiet -v -D__GNUC__=3 -D__GNUC_MINOR__=3 -
D__GNUC_PATCHLEVEL__=4 -D_GNU_SOURCE ../cpp/bugfiles/GCC_bugfiles/noerror/16717-attr-
constructor.cpp -D__GNUG__=3 -quiet -dumpbase 16717-attr-constructor.cpp -auxbase 16717-attr-
constructor -version -funit-at-a-time -o /tmp/ccKqhSCv.s
GNU C++ version 3.3.4 (pre 3.3.5 20040809) (i586-suse-linux)
        compiled by GNU C version 3.3.4 (pre 3.3.5 20040809).
GGC heuristics: --param ggc-min-expand=81 --param ggc-min-heapsize=96968
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/g++
 /usr/include/g++/i586-suse-linux
 /usr/include/g++/backward
 /usr/local/include
 /usr/lib/gcc-lib/i586-suse-linux/3.3.4/include
 /usr/i586-suse-linux/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/i586-suse-linux/3.3.4/../../../../i586-suse-linux/bin/as -V -Qy -o /tmp/ccgrP3v1.o 
/tmp/ccKqhSCv.s
GNU assembler version 2.15.91.0.2 (i586-suse-linux) using BFD version 2.15.91.0.2 20040727 (SuSE 
Linux)
 /usr/lib/gcc-lib/i586-suse-linux/3.3.4/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-
linux.so.2 /usr/lib/gcc-lib/i586-suse-linux/3.3.4/../../../crt1.o /usr/lib/gcc-lib/i586-suse-linux/
3.3.4/../../../crti.o /usr/lib/gcc-lib/i586-suse-linux/3.3.4/crtbegin.o -L/usr/lib/gcc-lib/i586-suse-
linux/3.3.4 -L/usr/lib/gcc-lib/i586-suse-linux/3.3.4/../../../../i586-suse-linux/lib -L/usr/lib/gcc-
lib/i586-suse-linux/3.3.4/../../.. /tmp/ccgrP3v1.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/
lib/gcc-lib/i586-suse-linux/3.3.4/crtend.o /usr/lib/gcc-lib/i586-suse-linux/3.3.4/../../../crtn.o
 flash@thrallis scripts 18:00:57
82> a.out
Hello world
Hello world
 flash@thrallis scripts 18:01:07
83> 
 flash@thrallis scripts 18:01:08
83> /usr/bin/g++ -fno-unit-at-a-time ../cpp/bugfiles/GCC_bugfiles/noerror/16717-attr-
constructor.cpp
 flash@thrallis scripts 18:01:37
84> a.out
Hello world
 flash@thrallis scripts 18:01:39
85>

-- 
           Summary: __attribute__((constructor)) called twice with -funit-
                    at-a-time
           Product: gcc
           Version: 3.3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: flash at pobox dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23472