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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [config/] [tls.m4] - Rev 183
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dnl Check whether the target supports TLS. AC_DEFUN([GCC_CHECK_TLS], [ GCC_ENABLE(tls, yes, [], [Use thread-local storage]) AC_CACHE_CHECK([whether the target supports thread-local storage], gcc_cv_have_tls, [ AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }], [dnl If the test case passed with dynamic linking, try again with dnl static linking, but only if static linking is supported (not dnl on Solaris 10). This fails with some older Red Hat releases. chktls_save_LDFLAGS="$LDFLAGS" LDFLAGS="-static $LDFLAGS" AC_LINK_IFELSE([int main() { return 0; }], AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }], [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[]), [gcc_cv_have_tls=yes]) LDFLAGS="$chktls_save_LDFLAGS" if test $gcc_cv_have_tls = yes; then dnl So far, the binutils and the compiler support TLS. dnl Also check whether the libc supports TLS, i.e. whether a variable dnl with __thread linkage has a different address in different threads. dnl First, find the thread_CFLAGS necessary for linking a program that dnl calls pthread_create. chktls_save_CFLAGS="$CFLAGS" thread_CFLAGS=failed for flag in '' '-pthread' '-lpthread'; do CFLAGS="$flag $chktls_save_CFLAGS" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [#include <pthread.h> void *g(void *d) { return NULL; }], [pthread_t t; pthread_create(&t,NULL,g,NULL);])], [thread_CFLAGS="$flag"]) if test "X$thread_CFLAGS" != Xfailed; then break fi done CFLAGS="$chktls_save_CFLAGS" if test "X$thread_CFLAGS" != Xfailed; then CFLAGS="$thread_CFLAGS $chktls_save_CFLAGS" AC_RUN_IFELSE( [AC_LANG_PROGRAM( [#include <pthread.h> __thread int a; static int *a_in_other_thread; static void * thread_func (void *arg) { a_in_other_thread = &a; return (void *)0; }], [pthread_t thread; void *thread_retval; int *a_in_main_thread; if (pthread_create (&thread, (pthread_attr_t *)0, thread_func, (void *)0)) return 0; a_in_main_thread = &a; if (pthread_join (thread, &thread_retval)) return 0; return (a_in_other_thread == a_in_main_thread);])], [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no], []) CFLAGS="$chktls_save_CFLAGS" fi fi], [gcc_cv_have_tls=no], [dnl This is the cross-compiling case. Assume libc supports TLS if the dnl binutils and the compiler do. AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }], [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no]) ] )]) if test "$enable_tls $gcc_cv_have_tls" = "yes yes"; then AC_DEFINE(HAVE_TLS, 1, [Define to 1 if the target supports thread-local storage.]) fi]) dnl Check whether the target assembler supports TLS. AC_DEFUN([GCC_CHECK_CC_TLS], [ GCC_ENABLE(tls, yes, [], [Use thread-local storage]) AC_CACHE_CHECK([whether the target asssembler upports thread-local storage], gcc_cv_have_cc_tls, [ AC_COMPILE_IFELSE([__thread int a; int b; int main() { return a = b; }], [gcc_cv_have_cc_tls=yes], [gcc_cv_have_cc_tls=no])] )]) if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then AC_DEFINE(HAVE_CC_TLS, 1, [Define to 1 if the target assembler supports thread-local storage.]) fi])
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