56 lines
2.4 KiB
Plaintext
56 lines
2.4 KiB
Plaintext
dnl Copyright © 2011 Apple Inc.
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dnl
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dnl Permission is hereby granted, free of charge, to any person obtaining a
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dnl copy of this software and associated documentation files (the "Software"),
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dnl to deal in the Software without restriction, including without limitation
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dnl the rights to use, copy, modify, merge, publish, distribute, sublicense,
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dnl and/or sell copies of the Software, and to permit persons to whom the
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dnl Software is furnished to do so, subject to the following conditions:
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dnl
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dnl The above copyright notice and this permission notice (including the next
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dnl paragraph) shall be included in all copies or substantial portions of the
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dnl Software.
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dnl
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dnl THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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dnl IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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dnl FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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dnl THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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dnl LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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dnl FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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dnl DEALINGS IN THE SOFTWARE.
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dnl
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dnl Authors: Jeremy Huddleston <jeremyhu@apple.com>
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AC_DEFUN([XORG_TLS], [
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AC_REQUIRE([XORG_STRICT_OPTION])
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AC_MSG_CHECKING(for thread local storage (TLS) support)
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AC_CACHE_VAL(ac_cv_tls, [
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ac_cv_tls=none
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keywords="__thread __declspec(thread)"
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for kw in $keywords ; do
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[int $kw test;]], [])], ac_cv_tls=$kw ; break ;)
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done
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])
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AC_MSG_RESULT($ac_cv_tls)
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if test "$ac_cv_tls" != "none"; then
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AC_MSG_CHECKING(for tls_model attribute support)
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AC_CACHE_VAL(ac_cv_tls_model, [
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save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $STRICT_CFLAGS"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[int $ac_cv_tls __attribute__((tls_model("initial-exec"))) test;]], [])],
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ac_cv_tls_model=yes, ac_cv_tls_model=no)
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CFLAGS="$save_CFLAGS"
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])
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AC_MSG_RESULT($ac_cv_tls_model)
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if test "x$ac_cv_tls_model" = "xyes" ; then
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xorg_tls=$ac_cv_tls' __attribute__((tls_model("initial-exec")))'
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else
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xorg_tls=$ac_cv_tls
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fi
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AC_DEFINE_UNQUOTED([TLS], $xorg_tls, [The compiler supported TLS storage class, prefering initial-exec if tls_model is supported])
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fi
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])
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