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Subject: [Bug libgcc/56482] New: missing -lpthread in configure when checking for pthreads_num_processors_np
Date: Thu, 28 Feb 2013 12:02:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56482

             Bug #: 56482
           Summary: missing -lpthread in configure when checking for
                    pthreads_num_processors_np
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcc
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: k2k@narod.ru
              Host: mingw32
            Target: mingw32, mingw32-w64


>>From configure.log:

configure:20205: checking for pthreads_num_processors_np
configure:20244:  /dvlp/packages/gcc/build/4.7.2-i686-w64-mingw32/./gcc/xgcc
-shared-libgcc -B/dvlp/packages/gcc/build/4.7.2-i686-w64-mingw32/./gcc
-nostdinc++
-L/dvlp/packages/gcc/build/4.7.2-i686-w64-mingw32/i686-w64-mingw32/libstdc++-v3/src
-L/dvlp/packages/gcc/build/4.7.2-i686-w64-mingw32/i686-w64-mingw32/libstdc++-v3/src/.libs
-L/dvlp/mingw-w64-i686/i686-w64-mingw32/lib -L/dvlp/mingw-w64-i686/mingw/lib
-isystem /dvlp/mingw-w64-i686/i686-w64-mingw32/include -isystem
/dvlp/mingw-w64-i686/mingw/include -B/dvlp/mingw-w64-i686/i686-w64-mingw32/bin/
-B/dvlp/mingw-w64-i686/i686-w64-mingw32/lib/ -isystem
/dvlp/mingw-w64-i686/i686-w64-mingw32/include -isystem
/dvlp/mingw-w64-i686/i686-w64-mingw32/sys-include
-L/dvlp/packages/gcc/build/4.7.2-i686-w64-mingw32/./ld    -o conftest.exe -g
-O2 -fno-exceptions   conftest.cpp  >&5
C:\Users\Karlson\AppData\Local\Temp\ccd7ltCc.o: In function `main':
T:\dvlp\packages\gcc\build\4.7.2-i686-w64-mingw32\i686-w64-mingw32\libstdc++-v3/conftest.cpp:76:
undefined reference to `_imp__pthread_num_processors_np'
collect2.exe: error: ld returned 1 exit status
configure:20244: $? = 1
configure: failed program was:
....


Configure didn't try with '-lpthread' flag, so result can't be linked with
libpthread.