mirror of https://github.com/lukechilds/komodo.git
Cory Fields
11 years ago
2 changed files with 223 additions and 0 deletions
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# =========================================================================== |
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# http://www.gnu.org/software/autoconf-archive/ax_gcc_func_attribute.html |
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# =========================================================================== |
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# |
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# SYNOPSIS |
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# |
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# AX_GCC_FUNC_ATTRIBUTE(ATTRIBUTE) |
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# |
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# DESCRIPTION |
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# |
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# This macro checks if the compiler supports one of GCC's function |
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# attributes; many other compilers also provide function attributes with |
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# the same syntax. Compiler warnings are used to detect supported |
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# attributes as unsupported ones are ignored by default so quieting |
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# warnings when using this macro will yield false positives. |
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# |
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# The ATTRIBUTE parameter holds the name of the attribute to be checked. |
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# |
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# If ATTRIBUTE is supported define HAVE_FUNC_ATTRIBUTE_<ATTRIBUTE>. |
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# |
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# The macro caches its result in the ax_cv_have_func_attribute_<attribute> |
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# variable. |
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# |
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# The macro currently supports the following function attributes: |
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# |
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# alias |
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# aligned |
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# alloc_size |
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# always_inline |
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# artificial |
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# cold |
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# const |
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# constructor |
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# deprecated |
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# destructor |
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# dllexport |
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# dllimport |
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# error |
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# externally_visible |
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# flatten |
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# format |
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# format_arg |
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# gnu_inline |
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# hot |
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# ifunc |
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# leaf |
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# malloc |
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# noclone |
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# noinline |
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# nonnull |
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# noreturn |
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# nothrow |
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# optimize |
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# pure |
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# unused |
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# used |
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# visibility |
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# warning |
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# warn_unused_result |
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# weak |
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# weakref |
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# |
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# Unsuppored function attributes will be tested with a prototype returning |
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# an int and not accepting any arguments and the result of the check might |
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# be wrong or meaningless so use with care. |
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# |
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# LICENSE |
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# |
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# Copyright (c) 2013 Gabriele Svelto <gabriele.svelto@gmail.com> |
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# |
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# Copying and distribution of this file, with or without modification, are |
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# permitted in any medium without royalty provided the copyright notice |
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# and this notice are preserved. This file is offered as-is, without any |
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# warranty. |
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|
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#serial 2 |
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|
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AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [ |
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AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1]) |
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|
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AC_CACHE_CHECK([for __attribute__(($1))], [ac_var], [ |
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AC_LINK_IFELSE([AC_LANG_PROGRAM([ |
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m4_case([$1], |
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[alias], [ |
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int foo( void ) { return 0; } |
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int bar( void ) __attribute__(($1("foo"))); |
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], |
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[aligned], [ |
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int foo( void ) __attribute__(($1(32))); |
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], |
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[alloc_size], [ |
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void *foo(int a) __attribute__(($1(1))); |
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], |
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[always_inline], [ |
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inline __attribute__(($1)) int foo( void ) { return 0; } |
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], |
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[artificial], [ |
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inline __attribute__(($1)) int foo( void ) { return 0; } |
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], |
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[cold], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[const], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[constructor], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[deprecated], [ |
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int foo( void ) __attribute__(($1(""))); |
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], |
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[destructor], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[dllexport], [ |
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__attribute__(($1)) int foo( void ) { return 0; } |
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], |
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[dllimport], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[error], [ |
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int foo( void ) __attribute__(($1(""))); |
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], |
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[externally_visible], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[flatten], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[format], [ |
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int foo(const char *p, ...) __attribute__(($1(printf, 1, 2))); |
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], |
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[format_arg], [ |
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char *foo(const char *p) __attribute__(($1(1))); |
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], |
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[gnu_inline], [ |
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inline __attribute__(($1)) int foo( void ) { return 0; } |
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], |
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[hot], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[ifunc], [ |
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int my_foo( void ) { return 0; } |
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static int (*resolve_foo(void))(void) { return my_foo; } |
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int foo( void ) __attribute__(($1("resolve_foo"))); |
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], |
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[leaf], [ |
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__attribute__(($1)) int foo( void ) { return 0; } |
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], |
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[malloc], [ |
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void *foo( void ) __attribute__(($1)); |
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], |
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[noclone], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[noinline], [ |
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__attribute__(($1)) int foo( void ) { return 0; } |
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], |
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[nonnull], [ |
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int foo(char *p) __attribute__(($1(1))); |
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], |
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[noreturn], [ |
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void foo( void ) __attribute__(($1)); |
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], |
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[nothrow], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[optimize], [ |
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__attribute__(($1(3))) int foo( void ) { return 0; } |
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], |
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[pure], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[unused], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[used], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[visibility], [ |
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int foo_def( void ) __attribute__(($1("default"))); |
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int foo_hid( void ) __attribute__(($1("hidden"))); |
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int foo_int( void ) __attribute__(($1("internal"))); |
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int foo_pro( void ) __attribute__(($1("protected"))); |
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], |
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[warning], [ |
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int foo( void ) __attribute__(($1(""))); |
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], |
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[warn_unused_result], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[weak], [ |
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int foo( void ) __attribute__(($1)); |
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], |
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[weakref], [ |
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static int foo( void ) { return 0; } |
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static int bar( void ) __attribute__(($1("foo"))); |
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], |
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[ |
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m4_warn([syntax], [Unsupported attribute $1, the test may fail]) |
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int foo( void ) __attribute__(($1)); |
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] |
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)], []) |
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], |
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dnl GCC doesn't exit with an error if an unknown attribute is |
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dnl provided but only outputs a warning, so accept the attribute |
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dnl only if no warning were issued. |
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[AS_IF([test -s conftest.err], |
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[AS_VAR_SET([ac_var], [no])], |
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[AS_VAR_SET([ac_var], [yes])])], |
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[AS_VAR_SET([ac_var], [no])]) |
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]) |
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|
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AS_IF([test yes = AS_VAR_GET([ac_var])], |
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[AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_FUNC_ATTRIBUTE_$1), 1, |
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[Define to 1 if the system has the `$1' function attribute])], []) |
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|
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AS_VAR_POPDEF([ac_var]) |
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]) |
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