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2de413db32
More macro updates from the pa_autoconf library. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
32 lines
1022 B
Plaintext
32 lines
1022 B
Plaintext
dnl --------------------------------------------------------------------------
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dnl PA_FUNC_ATTRIBUTE_ERROR
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dnl
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dnl See if this compiler supports __attribute__((error("foo"))) *and*
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dnl does *not* error if the erroneous call is unreachable.
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dnl
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dnl The generic version of this doesn't work as it makes the compiler
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dnl throw an error by design.
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dnl
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dnl This doesn't use a function pointer because there is no need:
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dnl the error function will never be a function pointer.
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dnl --------------------------------------------------------------------------
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AC_DEFUN([PA_FUNC_ATTRIBUTE_ERROR],
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[AC_MSG_CHECKING([whether $]_AC_CC[ supports the error function attribute])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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AC_INCLUDES_DEFAULT
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PA_ATTRIBUTE_SYNTAX
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extern ATTRIBUTE(error("message")) void barf(void);
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void foo(void);
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void foo(void)
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{
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if (0)
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barf();
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}
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])],
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[AC_MSG_RESULT([yes])
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AC_DEFINE([HAVE_FUNC_ATTRIBUTE_ERROR], 1,
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[Define to 1 if your compiler supports the error attribute on functions])],
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[AC_MSG_RESULT([no])])
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])
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