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1192.3.28
by Monty Taylor
pandora-build v0.72 - Moved remaining hard-coded tests into pandora-build |
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dnl Copyright (C) 2009 Sun Microsystems |
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dnl This file is free software; Sun Microsystems |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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#-------------------------------------------------------------------- |
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# Check for GCC Atomic Support |
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#-------------------------------------------------------------------- |
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AC_DEFUN([PANDORA_HAVE_GCC_ATOMICS],[ |
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AC_CACHE_CHECK(
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[whether the compiler provides atomic builtins], |
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[ac_cv_gcc_atomic_builtins], |
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[AC_RUN_IFELSE( |
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[AC_LANG_PROGRAM([],[[ |
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int foo= -10; int bar= 10;
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if (!__sync_fetch_and_add(&foo, bar) || foo)
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return -1;
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bar= __sync_lock_test_and_set(&foo, bar);
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if (bar || foo != 10)
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return -1;
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bar= __sync_val_compare_and_swap(&bar, foo, 15);
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if (bar)
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return -1;
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return 0;
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]])], |
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[ac_cv_gcc_atomic_builtins=yes], |
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[ac_cv_gcc_atomic_builtins=no])]) |
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AS_IF([test "x$ac_cv_gcc_atomic_builtins" = "xyes"],[ |
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AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS, 1,
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[Define to 1 if compiler provides atomic builtins.]) |
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]) |
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]) |