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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [config/] [futex.m4] - Rev 144
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dnl ---------------------------------------------------------------------- dnl This whole bit snagged from libgomp. dnl dnl GCC_LINUX_FUTEX dnl (SHELL-CODE_HANDLER) dnl AC_DEFUN([GCC_LINUX_FUTEX],[dnl GCC_ENABLE(linux-futex,default, ,[use the Linux futex system call], permit yes|no|default) case "$target" in *-linux*) case "$enable_linux_futex" in default) # If headers don't have gettid/futex syscalls definition, then # default to no, otherwise there will be compile time failures. # Otherwise, default to yes. If we don't detect we are # compiled/linked against NPTL and not cross-compiling, check # if programs are run by default against NPTL and if not, issue # a warning. enable_linux_futex=no AC_LINK_IFELSE( [AC_LANG_PROGRAM( [#include <sys/syscall.h> int lk;], [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])], [save_LIBS="$LIBS" LIBS="-lpthread $LIBS" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [#ifndef _GNU_SOURCE #define _GNU_SOURCE 1 #endif #include <pthread.h> pthread_t th; void *status;], [pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes], [if test x$cross_compiling = xno; then if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \ | LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then :; else AC_MSG_WARN([The kernel might not support futex or gettid syscalls. If so, please configure with --disable-linux-futex]) fi fi enable_linux_futex=yes]) LIBS="$save_LIBS"]) ;; yes) AC_LINK_IFELSE( [AC_LANG_PROGRAM( [#include <sys/syscall.h> int lk;], [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[], [AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])]) ;; esac ;; *) enable_linux_futex=no ;; esac if test x$enable_linux_futex = xyes; then $1 fi ])
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