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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [config/] [futex.m4] - Blame information for rev 847

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Line No. Rev Author Line
1 264 jeremybenn
dnl ----------------------------------------------------------------------
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dnl This whole bit snagged from libgomp.
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dnl
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dnl GCC_LINUX_FUTEX
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dnl    (SHELL-CODE_HANDLER)
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dnl
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AC_DEFUN([GCC_LINUX_FUTEX],[dnl
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GCC_ENABLE(linux-futex,default, ,[use the Linux futex system call],
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           permit yes|no|default)
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case "$target" in
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  *-linux*)
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    case "$enable_linux_futex" in
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      default)
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        # If headers don't have gettid/futex syscalls definition, then
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        # default to no, otherwise there will be compile time failures.
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        # Otherwise, default to yes.  If we don't detect we are
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        # compiled/linked against NPTL and not cross-compiling, check
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        # if programs are run by default against NPTL and if not, issue
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        # a warning.
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        enable_linux_futex=no
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        AC_LINK_IFELSE(
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         [AC_LANG_PROGRAM(
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          [#include <sys/syscall.h>
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           int lk;],
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          [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],
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          [save_LIBS="$LIBS"
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           LIBS="-lpthread $LIBS"
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           AC_LINK_IFELSE(
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           [AC_LANG_PROGRAM(
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            [#ifndef _GNU_SOURCE
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             #define _GNU_SOURCE 1
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             #endif
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             #include <pthread.h>
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             pthread_t th; void *status;],
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            [pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes],
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            [if test x$cross_compiling = xno; then
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               if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
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                  | LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then :; else
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                 AC_MSG_WARN([The kernel might not support futex or gettid syscalls.
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If so, please configure with --disable-linux-futex])
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               fi
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             fi
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             enable_linux_futex=yes])
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           LIBS="$save_LIBS"])
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        ;;
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      yes)
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        AC_LINK_IFELSE(
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         [AC_LANG_PROGRAM(
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          [#include <sys/syscall.h>
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           int lk;],
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          [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[],
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          [AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])])
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        ;;
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    esac
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    ;;
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  *)
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    enable_linux_futex=no
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    ;;
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esac
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if test x$enable_linux_futex = xyes; then
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  $1
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fi
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])

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