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91 lines
2.4 KiB
91 lines
2.4 KiB
dnl Check for the __thread/__declspec(thread) construct support.
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AC_DEFUN([AX_TLS_SUPPORT],
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[
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AH_TEMPLATE(HAVE_TLS_SUPPORT,
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[Defined if the compiler understands __thread or __declspec(thread)
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construct.])
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AH_TEMPLATE(TLS_SUPPORT_CONSTRUCT,
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[Defined to the actual TLS support construct.])
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ax_tls_support=no
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AC_CACHE_CHECK([for thread_local], [ac_cv_thread_local],
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[
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[
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extern thread_local int x;
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thread_local int * ptr = 0;
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int foo () { ptr = &x; return x; }
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thread_local int x = 1;
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]],
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[[x = 2;
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foo ();]])],
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[ac_cv__thread_local=yes
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ax_tls_support=yes],
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[ac_cv_thread_local=no],
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[ac_cv_thread_local=no])
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])
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AS_IF([test "x$ac_cv_thread_local" = "xyes"],
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[AC_DEFINE(HAVE_TLS_SUPPORT, [1])
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AC_DEFINE(TLS_SUPPORT_CONSTRUCT, [thread_local])])
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AS_IF([test "x$ax_tls_support" = "xno"], [
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AC_CACHE_CHECK([for __thread], [ac_cv__thread_keyword], [
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#if defined (__NetBSD__)
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#include <sys/param.h>
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#if ! __NetBSD_Prereq__(5,1,0)
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#error NetBSD __thread support does not work before 5.1.0. It is missing __tls_get_addr.
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#endif
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#endif
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extern __thread int x;
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__thread int * ptr = 0;
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int foo () { ptr = &x; return x; }
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__thread int x = 1;
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]],
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[[x = 2;
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foo ();
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]])],
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[ac_cv__thread_keyword=yes
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ax_tls_support=yes],
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[ac_cv__thread_keyword=no],
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[ac_cv__thread_keyword=no])
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])
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AS_IF([test "x$ac_cv__thread_keyword" = "xyes"],
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[AC_DEFINE(HAVE_TLS_SUPPORT, [1])
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AC_DEFINE(TLS_SUPPORT_CONSTRUCT, [__thread])])])
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AS_IF([test "x$ax_tls_support" = "xno"], [
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AC_CACHE_CHECK([for __declspec(thread)], [ac_cv_declspec_thread], [
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[
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#if defined (__GNUC__)
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# error Please fail.
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And extra please fail.
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#else
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extern __declspec(thread) int x;
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__declspec(thread) int * ptr = 0;
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int foo () { ptr = &x; return x; }
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__declspec(thread) int x = 1;
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#endif
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]],
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[[x = 2;
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foo ();]])],
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[ac_cv_declspec_thread=yes
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ax_tls_support=yes],
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[ac_cv_declspec_thread=no],
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[ac_cv_declspec_thread=no])])
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AS_IF([test "x$ac_cv_declspec_thread" = "xyes"],
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[AC_DEFINE(HAVE_TLS_SUPPORT, [1])
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AC_DEFINE(TLS_SUPPORT_CONSTRUCT, [__declspec(thread)])])])
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])dnl AX_TLS_SUPPORT
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