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[Bug c++/15391] New: -pthread not implicitly generating -lpthread when linking shared object

Summary:
    On System A, gcc is NOT implicitly generating a reference to -lpthread
    when specifying -pthread when building a shared library.

    On System B, gcc DOES implicitly generate a reference to -lpthread
    when specifying -pthread when building a shared library.

Expected Results:
    Specifying -pthread should generate link to -lpthread implicitly on
    System A.

Details:
    The following two blocks of output were generated using
	"g++ -v -shared -pthread -o crap crap.cpp"

    The first block was generated on System A:
	IBM pSeries running Red Hat Enterprise Server 3.0 AS.

    The second block was generated on System B:
	HP Proliant ML 350 (i386) running Red Hat Enterprise Server 3.0 WS

Both are using the same version of gcc (i.e. that which is installed by
default with RHES 3.0, namely gcc 3.2.3.



===========================================================
System A:
===========================================================
vulcan 145% g++ -v -shared -pthread -o crap crap.cpp

Reading specs from /usr/lib/gcc-lib/ppc64-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --
infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-
checking --with-system-zlib --enable-__cxa_atexit --host=ppc64-redhat-linux --
build=ppc64-redhat-linux --target=ppc64-redhat-linux --with-cpu=default32
Thread model: posix
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-24)
 /usr/lib/gcc-lib/ppc64-redhat-linux/3.2.3/cc1plus -v -D__GNUC__=3 -
D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=3 -D__GXX_ABI_VERSION=102 -
D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_GNU_SOURCE -D_CALL_SYSV -D_BIG_ENDIAN -
D__BIG_ENDIAN__ -Amachine=bigendian -D_ARCH_PPC -DPPC -Dpowerpc -D__PPC__ -
D__ELF__ -D__powerpc__ -D__PPC -D__powerpc -Acpu=powerpc -Amachine=powerpc -
D__SIZE_TYPE__=unsigned int -D__PTRDIFF_TYPE__=int -D__WCHAR_TYPE__=long int -
D__unix__ -D__gnu_linux__ -D__linux__ -Dunix -D__unix -Dlinux -D__linux -
Asystem=unix -Asystem=posix -D_REENTRANT crap.cpp -D__GNUG__=3 -D__DEPRECATED -
D__EXCEPTIONS -quiet -dumpbase crap.cpp -version -o /tmp/cc4u8hmR.s
GNU CPP version 3.2.3 20030502 (Red Hat Linux 3.2.3-24) (cpplib) (PowerPC64 
GNU/Linux)
GNU C++ version 3.2.3 20030502 (Red Hat Linux 3.2.3-24) (ppc64-redhat-linux)
        compiled by GNU C version 3.2.3 20030502 (Red Hat Linux 3.2.3-24).
ignoring nonexistent directory "/usr/ppc64-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/3.2.3
 /usr/include/c++/3.2.3/ppc64-redhat-linux
 /usr/include/c++/3.2.3/backward
 /usr/local/include
 /usr/lib/gcc-lib/ppc64-redhat-linux/3.2.3/include
 /usr/include
End of search list.
 as -a32 -mppc -V -Qy -o /tmp/ccyUL2pG.o /tmp/cc4u8hmR.s
GNU assembler version 2.14.90.0.4 (ppc-redhat-linux) using BFD version 
2.14.90.0.4 20030523
 /usr/lib/gcc-lib/ppc64-redhat-linux/3.2.3/collect2 --eh-frame-hdr -V -Qy -
shared -m elf32ppclinux -o crap /usr/lib/gcc-lib/ppc64-redhat-
linux/3.2.3/../../../../lib/crti.o /usr/lib/gcc-lib/ppc64-redhat-
linux/3.2.3/crtbeginS.o -L/usr/lib/gcc-lib/ppc64-redhat-linux/3.2.3 -
L/usr/lib/gcc-lib/ppc64-redhat-linux/3.2.3/../../../../lib -L/usr/lib/gcc-
lib/ppc64-redhat-linux/3.2.3/../../.. -L/lib/../lib -
L/usr/lib/../lib /tmp/ccyUL2pG.o -lstdc++ -lm -lgcc_s -lc -lgcc_s /usr/lib/gcc-
lib/ppc64-redhat-linux/3.2.3/crtsavres.o /usr/lib/gcc-lib/ppc64-redhat-
linux/3.2.3/crtendS.o /usr/lib/gcc-lib/ppc64-redhat-
linux/3.2.3/../../../../lib/crtn.o
GNU ld version 2.14.90.0.4 20030523
  Supported emulations:
   elf32ppclinux
   elf32ppc
   elf32ppcsim
   elf64ppc

===========================================================
System B:
===========================================================
drifter.cognos.com 55% g++ -v -shared -pthread -o crap crap.cpp
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --
infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-
checking --with-system-zlib --enable-__cxa_atexit --host=i386-redhat-linux
Thread model: posix
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-24)
 /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/cc1plus -v -D__GNUC__=3 -
D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=3 -D__GXX_ABI_VERSION=102 -D__ELF__ -
Dunix -D__gnu_linux__ -Dlinux -D__ELF__ -D__unix__ -D__gnu_linux__ -D__linux__ -
D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -
D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -
D__tune_i386__ -D_REENTRANT crap.cpp -D__GNUG__=3 -D__DEPRECATED -
D__EXCEPTIONS -quiet -dumpbase crap.cpp -version -o /tmp/ccfgMhMf.s
GNU CPP version 3.2.3 20030502 (Red Hat Linux 3.2.3-24) (cpplib) (i386 
Linux/ELF)
GNU C++ version 3.2.3 20030502 (Red Hat Linux 3.2.3-24) (i386-redhat-linux)
        compiled by GNU C version 3.2.3 20030502 (Red Hat Linux 3.2.3-24).
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/3.2.3
 /usr/include/c++/3.2.3/i386-redhat-linux
 /usr/include/c++/3.2.3/backward
 /usr/local/include
 /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/include
 /usr/include
End of search list.
 as -V -Qy -o /tmp/ccgmVfZm.o /tmp/ccfgMhMf.s
GNU assembler version 2.14.90.0.4 (i386-redhat-linux) using BFD version 
2.14.90.0.4 20030523
 /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/collect2 --eh-frame-hdr -m elf_i386 -
shared -o crap /usr/lib/gcc-lib/i386-redhat-
linux/3.2.3/../../../crti.o /usr/lib/gcc-lib/i386-redhat-
linux/3.2.3/crtbeginS.o -L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3 -
L/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../.. /tmp/ccgmVfZm.o -lstdc++ -
lm -lgcc_s -lpthread -lc -lgcc_s /usr/lib/gcc-lib/i386-redhat-
linux/3.2.3/crtendS.o /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../../crtn.o

-- 
           Summary: -pthread not implicitly generating -lpthread when
                    linking shared object
           Product: gcc
           Version: 3.2.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: John dot Bossom at cognos dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15391
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