00960b40b9
No real changes, just avoid warnings from autoconf 2.71 when regenerating configure. Note that double brackets must be used around any code using brackets to preserve them during the expansion.
26 lines
812 B
Text
26 lines
812 B
Text
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dnl Checks for availability of GCC's atomic operations builtins.
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dnl Defines HAVE_GCC_ATOMIC_BUILTINS if available.
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AC_DEFUN([WX_ATOMIC_BUILTINS],
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[
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AC_REQUIRE([AC_PROG_CC])
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if test -n "$GCC"; then
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AC_MSG_CHECKING([for __sync_xxx_and_fetch builtins])
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AC_CACHE_VAL(wx_cv_cc_gcc_atomic_builtins, [
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AC_LINK_IFELSE([AC_LANG_PROGRAM(
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[],
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[
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unsigned int value=0;
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volatile unsigned int r1 = __sync_add_and_fetch(&value, 2);
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volatile unsigned int r2 = __sync_sub_and_fetch(&value, 1);
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])],
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wx_cv_cc_gcc_atomic_builtins=yes,
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wx_cv_cc_gcc_atomic_builtins=no)
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])
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AC_MSG_RESULT([$wx_cv_cc_gcc_atomic_builtins])
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if test $wx_cv_cc_gcc_atomic_builtins = yes; then
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AC_DEFINE([HAVE_GCC_ATOMIC_BUILTINS])
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fi
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fi
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])
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