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64 lines
1.8 KiB
64 lines
1.8 KiB
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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