bpo-35903: Use autoconfig to probe for shm_open() and shm_unlink(). (#11765)
Use autoconfig to probe for shm_open() and shm_unlink(). Set SHM_NEEDS_LIBRT if we must link with librt to get the shm_* functions. Change setup.py to use the autoconfig defines. These changes should make it more likely that _multiprocessing/posixshmem.c gets built correctly on different platforms.
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@ -16862,6 +16862,108 @@ $as_echo "#define HAVE_GETRANDOM 1" >>confdefs.h
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fi
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# checks for POSIX shared memory, used by Modules/_multiprocessing/posixshmem.c
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# shm_* may only be available if linking against librt
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save_LIBS="$LIBS"
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save_includes_default="$ac_includes_default"
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing shm_open" >&5
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$as_echo_n "checking for library containing shm_open... " >&6; }
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if ${ac_cv_search_shm_open+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ac_func_search_save_LIBS=$LIBS
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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/* Override any GCC internal prototype to avoid an error.
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Use char because int might match the return type of a GCC
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builtin and then its argument prototype would still apply. */
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#ifdef __cplusplus
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extern "C"
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#endif
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char shm_open ();
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int
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main ()
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{
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return shm_open ();
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;
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return 0;
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}
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_ACEOF
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for ac_lib in '' rt; do
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if test -z "$ac_lib"; then
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ac_res="none required"
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else
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ac_res=-l$ac_lib
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LIBS="-l$ac_lib $ac_func_search_save_LIBS"
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fi
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if ac_fn_c_try_link "$LINENO"; then :
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ac_cv_search_shm_open=$ac_res
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fi
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rm -f core conftest.err conftest.$ac_objext \
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conftest$ac_exeext
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if ${ac_cv_search_shm_open+:} false; then :
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break
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fi
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done
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if ${ac_cv_search_shm_open+:} false; then :
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else
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ac_cv_search_shm_open=no
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fi
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rm conftest.$ac_ext
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LIBS=$ac_func_search_save_LIBS
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_shm_open" >&5
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$as_echo "$ac_cv_search_shm_open" >&6; }
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ac_res=$ac_cv_search_shm_open
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if test "$ac_res" != no; then :
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test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
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fi
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if test "$ac_cv_search_shm_open" = "-lrt"; then
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$as_echo "#define SHM_NEEDS_LIBRT 1" >>confdefs.h
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fi
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for ac_header in sys/mman.h
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do :
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ac_fn_c_check_header_mongrel "$LINENO" "sys/mman.h" "ac_cv_header_sys_mman_h" "$ac_includes_default"
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if test "x$ac_cv_header_sys_mman_h" = xyes; then :
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cat >>confdefs.h <<_ACEOF
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#define HAVE_SYS_MMAN_H 1
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_ACEOF
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fi
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done
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# temporarily override ac_includes_default for AC_CHECK_FUNCS below
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ac_includes_default="\
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${ac_includes_default}
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#ifndef __cplusplus
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# ifdef HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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# endif
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#endif
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"
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for ac_func in shm_open shm_unlink
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do :
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as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
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ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
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if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
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cat >>confdefs.h <<_ACEOF
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#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
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_ACEOF
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fi
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done
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# we don't want to link with librt always, restore LIBS
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LIBS="$save_LIBS"
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ac_includes_default="$save_includes_default"
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# Check for usable OpenSSL
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found=false
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24
configure.ac
24
configure.ac
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@ -5443,6 +5443,30 @@ if test "$have_getrandom" = yes; then
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[Define to 1 if the getrandom() function is available])
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fi
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# checks for POSIX shared memory, used by Modules/_multiprocessing/posixshmem.c
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# shm_* may only be available if linking against librt
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save_LIBS="$LIBS"
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save_includes_default="$ac_includes_default"
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AC_SEARCH_LIBS(shm_open, rt)
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if test "$ac_cv_search_shm_open" = "-lrt"; then
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AC_DEFINE(SHM_NEEDS_LIBRT, 1,
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[Define to 1 if you must link with -lrt for shm_open().])
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fi
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AC_CHECK_HEADERS(sys/mman.h)
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# temporarily override ac_includes_default for AC_CHECK_FUNCS below
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ac_includes_default="\
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${ac_includes_default}
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#ifndef __cplusplus
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# ifdef HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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# endif
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#endif
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"
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AC_CHECK_FUNCS([shm_open shm_unlink])
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# we don't want to link with librt always, restore LIBS
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LIBS="$save_LIBS"
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ac_includes_default="$save_includes_default"
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# Check for usable OpenSSL
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AX_CHECK_OPENSSL([have_openssl=yes],[have_openssl=no])
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@ -144,6 +144,18 @@
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/* Define to 1 if you have the `copysign' function. */
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#undef HAVE_COPYSIGN
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/* Define to 1 if you must link with -lrt for shm_open(). */
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#undef SHM_NEEDS_LIBRT
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/* Define to 1 if you have the <sys/mman.h> header file. */
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#undef HAVE_SYS_MMAN_H
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/* Define to 1 if you have the shm_open syscall */
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#undef HAVE_SHM_OPEN
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/* Define to 1 if you have the shm_unlink syscall */
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#undef HAVE_SHM_UNLINK
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/* Define to 1 if you have the <crypt.h> header file. */
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#undef HAVE_CRYPT_H
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7
setup.py
7
setup.py
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@ -1592,12 +1592,13 @@ class PyBuildExt(build_ext):
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if (sysconfig.get_config_var('HAVE_SEM_OPEN') and not
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sysconfig.get_config_var('POSIX_SEMAPHORES_NOT_ENABLED')):
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multiprocessing_srcs.append('_multiprocessing/semaphore.c')
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if (self.compiler.find_library_file(lib_dirs, 'rt') or
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host_platform != 'cygwin'):
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if (sysconfig.get_config_var('HAVE_SHM_OPEN') and
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sysconfig.get_config_var('HAVE_SHM_UNLINK')):
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posixshmem_srcs = [ '_multiprocessing/posixshmem.c',
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]
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libs = []
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if self.compiler.find_library_file(lib_dirs, 'rt'):
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if sysconfig.get_config_var('SHM_NEEDS_LIBRT'):
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# need to link with librt to get shm_open()
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libs.append('rt')
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exts.append( Extension('_posixshmem', posixshmem_srcs,
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define_macros={},
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