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comparison config/futex.m4 @ 0:a06113de4d67

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first commit
author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
parents
children 1830386684a0
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-1:000000000000 0:a06113de4d67
1 dnl ----------------------------------------------------------------------
2 dnl This whole bit snagged from libgomp.
3
4 dnl
5 dnl GCC_LINUX_FUTEX
6 dnl (SHELL-CODE_HANDLER)
7 dnl
8 AC_DEFUN([GCC_LINUX_FUTEX],[dnl
9 GCC_ENABLE(linux-futex,default, ,[use the Linux futex system call],
10 permit yes|no|default)
11 case "$target" in
12 *-linux*)
13 case "$enable_linux_futex" in
14 default)
15 # If headers don't have gettid/futex syscalls definition, then
16 # default to no, otherwise there will be compile time failures.
17 # Otherwise, default to yes. If we don't detect we are
18 # compiled/linked against NPTL and not cross-compiling, check
19 # if programs are run by default against NPTL and if not, issue
20 # a warning.
21 enable_linux_futex=no
22 AC_LINK_IFELSE(
23 [AC_LANG_PROGRAM(
24 [#include <sys/syscall.h>
25 int lk;],
26 [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],
27 [save_LIBS="$LIBS"
28 LIBS="-lpthread $LIBS"
29 AC_LINK_IFELSE(
30 [AC_LANG_PROGRAM(
31 [#ifndef _GNU_SOURCE
32 #define _GNU_SOURCE 1
33 #endif
34 #include <pthread.h>
35 pthread_t th; void *status;],
36 [pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes],
37 [if test x$cross_compiling = xno; then
38 if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
39 | LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then :; else
40 AC_MSG_WARN([The kernel might not support futex or gettid syscalls.
41 If so, please configure with --disable-linux-futex])
42 fi
43 fi
44 enable_linux_futex=yes])
45 LIBS="$save_LIBS"])
46 ;;
47 yes)
48 AC_LINK_IFELSE(
49 [AC_LANG_PROGRAM(
50 [#include <sys/syscall.h>
51 int lk;],
52 [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[],
53 [AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])])
54 ;;
55 esac
56 ;;
57 *)
58 enable_linux_futex=no
59 ;;
60 esac
61 if test x$enable_linux_futex = xyes; then
62 $1
63 fi
64 ])