28 lines
808 B
Plaintext
28 lines
808 B
Plaintext
# Helper function to check for gcc attributes.
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# AST_GCC_ATTRIBUTE([attribute name], [attribute syntax], [attribute scope], [makeopts flag])
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AC_DEFUN([AST_GCC_ATTRIBUTE],
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[
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AC_MSG_CHECKING(for compiler 'attribute $1' support)
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saved_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Wall -Wno-unused -Werror"
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m4_ifval([$4],$4=0)
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ax_cv_have_func_attribute_$1=0
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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m4_ifval([$2],
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[$3 void __attribute__(($2)) *test(void *muffin, ...) ;],
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[$3 void __attribute__(($1)) *test(void *muffin, ...) {return (void *) 0;}]))],
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AC_MSG_RESULT(yes)
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m4_ifval([$4],$4=1)
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ax_cv_have_func_attribute_$1=1
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AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_$1], 1, [Define to 1 if your GCC C compiler supports the '$1' attribute.]),
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AC_MSG_RESULT(no)
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)
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m4_ifval([$4],[AC_SUBST($4)])
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CFLAGS="$saved_CFLAGS"
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]
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)
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