LoongArch: Add constraints for bit string operation define_insn_and_split's [PR114861]
[official-gcc.git] / config / futex.m4
blobc21243854a9381fca22c6c949c4c2f8ae1a12b81
1 dnl ----------------------------------------------------------------------
2 dnl This whole bit snagged from libgomp.
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 "$target" in
12   *-linux* | *-uclinux*)
13     case "$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            #include <unistd.h>
26            int lk;],
27           [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],
28           [save_LIBS="$LIBS"
29            LIBS="-lpthread $LIBS"
30            AC_LINK_IFELSE(
31            [AC_LANG_PROGRAM(
32             [#ifndef _GNU_SOURCE
33              #define _GNU_SOURCE 1
34              #endif
35              #include <pthread.h>
36              pthread_t th; void *status;],
37             [pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes],
38             [if test x$cross_compiling = xno; then
39                if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
40                   | LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then :; else
41                  AC_MSG_WARN([The kernel might not support futex or gettid syscalls.
42 If so, please configure with --disable-linux-futex])
43                fi
44              fi
45              enable_linux_futex=yes])
46            LIBS="$save_LIBS"])
47         ;;
48       yes)
49         AC_LINK_IFELSE(
50          [AC_LANG_PROGRAM(
51           [#include <sys/syscall.h>
52            #include <unistd.h>
53            int lk;],
54           [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[],
55           [AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])])
56         ;;
57     esac
58     ;;
59   *)
60     enable_linux_futex=no
61     ;;
62 esac
63 if test x$enable_linux_futex = xyes; then
64   $1