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use sysv abi on windows nasty kludge for msabi msys2: force gcc build clarify the clang situation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,245 @@ | ||
| # =========================================================================== | ||
| # https://www.gnu.org/software/autoconf-archive/ax_gcc_func_attribute.html | ||
| # =========================================================================== | ||
| # | ||
| # SYNOPSIS | ||
| # | ||
| # AX_GCC_FUNC_ATTRIBUTE(ATTRIBUTE) | ||
| # | ||
| # DESCRIPTION | ||
| # | ||
| # This macro checks if the compiler supports one of GCC's function | ||
| # attributes; many other compilers also provide function attributes with | ||
| # the same syntax. Compiler warnings are used to detect supported | ||
| # attributes as unsupported ones are ignored by default so quieting | ||
| # warnings when using this macro will yield false positives. | ||
| # | ||
| # The ATTRIBUTE parameter holds the name of the attribute to be checked. | ||
| # | ||
| # If ATTRIBUTE is supported define HAVE_FUNC_ATTRIBUTE_<ATTRIBUTE>. | ||
| # | ||
| # The macro caches its result in the ax_cv_have_func_attribute_<attribute> | ||
| # variable. | ||
| # | ||
| # The macro currently supports the following function attributes: | ||
| # | ||
| # alias | ||
| # aligned | ||
| # alloc_size | ||
| # always_inline | ||
| # artificial | ||
| # cold | ||
| # const | ||
| # constructor | ||
| # constructor_priority for constructor attribute with priority | ||
| # deprecated | ||
| # destructor | ||
| # dllexport | ||
| # dllimport | ||
| # error | ||
| # externally_visible | ||
| # fallthrough | ||
| # flatten | ||
| # format | ||
| # format_arg | ||
| # gnu_format | ||
| # gnu_inline | ||
| # hot | ||
| # ifunc | ||
| # leaf | ||
| # malloc | ||
| # noclone | ||
| # noinline | ||
| # nonnull | ||
| # noreturn | ||
| # nothrow | ||
| # optimize | ||
| # pure | ||
| # sentinel | ||
| # sentinel_position | ||
| # unused | ||
| # used | ||
| # visibility | ||
| # warning | ||
| # warn_unused_result | ||
| # weak | ||
| # weakref | ||
| # | ||
| # Unsupported function attributes will be tested with a prototype | ||
| # returning an int and not accepting any arguments and the result of the | ||
| # check might be wrong or meaningless so use with care. | ||
| # | ||
| # LICENSE | ||
| # | ||
| # Copyright (c) 2013 Gabriele Svelto <gabriele.svelto@gmail.com> | ||
| # | ||
| # Copying and distribution of this file, with or without modification, are | ||
| # permitted in any medium without royalty provided the copyright notice | ||
| # and this notice are preserved. This file is offered as-is, without any | ||
| # warranty. | ||
|
|
||
| #serial 13 | ||
|
|
||
| AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [ | ||
| AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1]) | ||
| AC_CACHE_CHECK([for __attribute__(($1))], [ac_var], [ | ||
| AC_LINK_IFELSE([AC_LANG_PROGRAM([ | ||
| m4_case([$1], | ||
| [alias], [ | ||
| int foo( void ) { return 0; } | ||
| int bar( void ) __attribute__(($1("foo"))); | ||
| ], | ||
| [aligned], [ | ||
| int foo( void ) __attribute__(($1(32))); | ||
| ], | ||
| [alloc_size], [ | ||
| void *foo(int a) __attribute__(($1(1))); | ||
| ], | ||
| [always_inline], [ | ||
| inline __attribute__(($1)) int foo( void ) { return 0; } | ||
| ], | ||
| [artificial], [ | ||
| inline __attribute__(($1)) int foo( void ) { return 0; } | ||
| ], | ||
| [cold], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [const], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [constructor_priority], [ | ||
| int foo( void ) __attribute__((__constructor__(65535/2))); | ||
| ], | ||
| [constructor], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [deprecated], [ | ||
| int foo( void ) __attribute__(($1(""))); | ||
| ], | ||
| [destructor], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [dllexport], [ | ||
| __attribute__(($1)) int foo( void ) { return 0; } | ||
| ], | ||
| [dllimport], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [error], [ | ||
| int foo( void ) __attribute__(($1(""))); | ||
| ], | ||
| [externally_visible], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [fallthrough], [ | ||
| void foo( int x ) {switch (x) { case 1: __attribute__(($1)); case 2: break ; }}; | ||
| ], | ||
| [flatten], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [format], [ | ||
| int foo(const char *p, ...) __attribute__(($1(printf, 1, 2))); | ||
| ], | ||
| [gnu_format], [ | ||
| int foo(const char *p, ...) __attribute__((format(gnu_printf, 1, 2))); | ||
| ], | ||
| [format_arg], [ | ||
| char *foo(const char *p) __attribute__(($1(1))); | ||
| ], | ||
| [gnu_inline], [ | ||
| inline __attribute__(($1)) int foo( void ) { return 0; } | ||
| ], | ||
| [hot], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [ifunc], [ | ||
| int my_foo( void ) { return 0; } | ||
| static int (*resolve_foo(void))(void) { return my_foo; } | ||
| int foo( void ) __attribute__(($1("resolve_foo"))); | ||
| ], | ||
| [leaf], [ | ||
| __attribute__(($1)) int foo( void ) { return 0; } | ||
| ], | ||
| [malloc], [ | ||
| void *foo( void ) __attribute__(($1)); | ||
| ], | ||
| [noclone], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [noinline], [ | ||
| __attribute__(($1)) int foo( void ) { return 0; } | ||
| ], | ||
| [nonnull], [ | ||
| int foo(char *p) __attribute__(($1(1))); | ||
| ], | ||
| [noreturn], [ | ||
| void foo( void ) __attribute__(($1)); | ||
| ], | ||
| [nothrow], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [optimize], [ | ||
| __attribute__(($1(3))) int foo( void ) { return 0; } | ||
| ], | ||
| [pure], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [sentinel], [ | ||
| int foo(void *p, ...) __attribute__(($1)); | ||
| ], | ||
| [sentinel_position], [ | ||
| int foo(void *p, ...) __attribute__(($1(1))); | ||
| ], | ||
| [sysv_abi], [ | ||
| __attribute__(($1)) int foo( int a, int b, int c ); | ||
| ], | ||
| [returns_nonnull], [ | ||
| void *foo( void ) __attribute__(($1)); | ||
| ], | ||
| [unused], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [used], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [visibility], [ | ||
| int foo_def( void ) __attribute__(($1("default"))); | ||
| int foo_hid( void ) __attribute__(($1("hidden"))); | ||
| int foo_int( void ) __attribute__(($1("internal"))); | ||
| int foo_pro( void ) __attribute__(($1("protected"))); | ||
| ], | ||
| [warning], [ | ||
| int foo( void ) __attribute__(($1(""))); | ||
| ], | ||
| [warn_unused_result], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [weak], [ | ||
| int foo( void ) __attribute__(($1)); | ||
| ], | ||
| [weakref], [ | ||
| static int foo( void ) { return 0; } | ||
| static int bar( void ) __attribute__(($1("foo"))); | ||
| ], | ||
| [ | ||
| m4_warn([syntax], [Unsupported attribute $1, the test may fail]) | ||
| int foo( void ) __attribute__(($1)); | ||
| ] | ||
| )], []) | ||
| ], | ||
| dnl GCC doesn't exit with an error if an unknown attribute is | ||
| dnl provided but only outputs a warning, so accept the attribute | ||
| dnl only if no warning were issued. | ||
| [AS_IF([grep -- -Wattributes conftest.err], | ||
| [AS_VAR_SET([ac_var], [no])], | ||
| [AS_VAR_SET([ac_var], [yes])])], | ||
| [AS_VAR_SET([ac_var], [no])]) | ||
| ]) | ||
| AS_IF([test yes = AS_VAR_GET([ac_var])], | ||
| [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_FUNC_ATTRIBUTE_$1), 1, | ||
| [Define to 1 if the system has the `$1' function attribute])], []) | ||
| AS_VAR_POPDEF([ac_var]) | ||
| ]) |
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