2002-12-03 09:19:58 +01:00
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AC_DEFUN([LIBUNWIND___THREAD],
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[dnl Check whether the compiler supports the __thread keyword.
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if test "x$use__thread" != xno; then
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AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
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[cat > conftest.c <<\EOF
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__thread int a = 42;
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EOF
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
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libc_cv_gcc___thread=yes
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else
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libc_cv_gcc___thread=no
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fi
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rm -f conftest*])
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if test "$libc_cv_gcc___thread" = yes; then
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AC_DEFINE(HAVE___THREAD, 1,
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[Define to 1 if __thread keyword is supported by the C compiler.])
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fi
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else
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libc_cv_gcc___thread=no
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fi])
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