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Edit File : ax_gcc_func_attribute.m4 \| Size : 8.21 KB
# =========================================================================== # 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_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 9 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], [ int foo( void ) {switch (0) { case 1: __attribute__(($1)); case 2: break ; }}; ], [flatten], [ int foo( void ) __attribute__(($1)); ], [format], [ int foo(const char p, ...) __attribute__(($1(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))); ], [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"))); ], [target], [ int bar( void ) __attribute__(($1("sse2"))); ], [ 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([test -s 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]) ]) Back

Edit File : ax_gcc_func_attribute.m4 | Size : 8.21 KB

# ===========================================================================
#  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_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 9

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], [
                    int foo( void ) {switch (0) { case 1: __attribute__(($1)); case 2: break ; }};
                ],
                [flatten], [
                    int foo( void ) __attribute__(($1));
                ],
                [format], [
                    int foo(const char *p, ...) __attribute__(($1(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)));
                ],
                [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")));
                ],
                [target], [
                    int bar( void ) __attribute__(($1("sse2")));
                ],
                [
                 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([test -s 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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