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47 lines
1.3 KiB
47 lines
1.3 KiB
dnl Copyright (C) 2004-2008 Kim Woelders |
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dnl Copyright (C) 2008 Vincent Torri <vtorri at univ-evry dot fr> |
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dnl That code is public domain and can be freely used or copied. |
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dnl Originally snatched from somewhere... |
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dnl Macro for checking if the compiler supports __attribute__ |
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dnl Usage: AC_C___ATTRIBUTE__ |
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dnl call AC_DEFINE for HAVE___ATTRIBUTE__ and __UNUSED__ |
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dnl if the compiler supports __attribute__, HAVE___ATTRIBUTE__ is |
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dnl defined to 1 and __UNUSED__ is defined to __attribute__((unused)) |
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dnl otherwise, HAVE___ATTRIBUTE__ is not defined and __UNUSED__ is |
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dnl defined to nothing. |
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AC_DEFUN([AC_C___ATTRIBUTE__], |
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[ |
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AC_MSG_CHECKING([for __attribute__]) |
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AC_CACHE_VAL([ac_cv___attribute__], |
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[AC_TRY_COMPILE( |
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[ |
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#include <stdlib.h> |
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int func(int x); |
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int foo(int x __attribute__ ((unused))) |
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{ |
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exit(1); |
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} |
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], |
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[], |
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[ac_cv___attribute__="yes"], |
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[ac_cv___attribute__="no"] |
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)]) |
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AC_MSG_RESULT($ac_cv___attribute__) |
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if test "x${ac_cv___attribute__}" = "xyes" ; then |
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AC_DEFINE([HAVE___ATTRIBUTE__], [1], [Define to 1 if your compiler has __attribute__]) |
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AC_DEFINE([__UNUSED__], [__attribute__((unused))], [Macro declaring a function argument to be unused]) |
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else |
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AC_DEFINE([__UNUSED__], [], [Macro declaring a function argument to be unused]) |
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fi |
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]) |
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dnl End of ac_attribute.m4
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