diff options
Diffstat (limited to 'm4/gnulib-common.m4')
| -rw-r--r-- | m4/gnulib-common.m4 | 100 |
1 files changed, 71 insertions, 29 deletions
diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4 index 8a5daa230..2db3376b0 100644 --- a/m4/gnulib-common.m4 +++ b/m4/gnulib-common.m4 @@ -1,5 +1,5 @@ -# gnulib-common.m4 serial 73 -dnl Copyright (C) 2007-2022 Free Software Foundation, Inc. +# gnulib-common.m4 serial 76 +dnl Copyright (C) 2007-2023 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -71,7 +71,7 @@ AC_DEFUN([gl_COMMON_BODY], [ && (!defined __clang_minor__ \ || (defined __apple_build_version__ \ ? 6000000 <= __apple_build_version__ \ - : 3 < __clang_major__ + (5 <= __clang_minor__)))) + : 5 <= __clang_major__))) # define _GL_HAS_ATTRIBUTE(attr) __has_attribute (__##attr##__) #else # define _GL_HAS_ATTRIBUTE(attr) _GL_ATTR_##attr @@ -105,17 +105,13 @@ AC_DEFUN([gl_COMMON_BODY], [ # define _GL_ATTR_warn_unused_result _GL_GNUC_PREREQ (3, 4) #endif -#ifdef __has_c_attribute -# if ((defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) <= 201710 \ - && _GL_GNUC_PREREQ (4, 6)) -# pragma GCC diagnostic ignored "-Wpedantic" -# endif -# define _GL_HAS_C_ATTRIBUTE(attr) __has_c_attribute (__##attr##__) -#else -# define _GL_HAS_C_ATTRIBUTE(attr) 0 +/* Disable GCC -Wpedantic if using __has_c_attribute and this is not C23+. */ +#if (defined __has_c_attribute && _GL_GNUC_PREREQ (4, 6) \ + && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) <= 201710) +# pragma GCC diagnostic ignored "-Wpedantic" #endif -]dnl There is no _GL_ATTRIBUTE_ALIGNED; use stdalign's _Alignas instead. +]dnl There is no _GL_ATTRIBUTE_ALIGNED; use stdalign's alignas instead. [ /* _GL_ATTRIBUTE_ALLOC_SIZE ((N)) declares that the Nth argument of the function is the size of the returned memory block. @@ -191,7 +187,14 @@ AC_DEFUN([gl_COMMON_BODY], [ to use this earlier definition, since <stdlib.h> may not have been included yet. */ #ifndef _GL_ATTRIBUTE_DEALLOC_FREE -# define _GL_ATTRIBUTE_DEALLOC_FREE _GL_ATTRIBUTE_DEALLOC (free, 1) +# if defined __cplusplus && defined __GNUC__ && !defined __clang__ +/* Work around GCC bug <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108231> */ +# define _GL_ATTRIBUTE_DEALLOC_FREE \ + _GL_ATTRIBUTE_DEALLOC ((void (*) (void *)) free, 1) +# else +# define _GL_ATTRIBUTE_DEALLOC_FREE \ + _GL_ATTRIBUTE_DEALLOC (free, 1) +# endif #endif /* _GL_ATTRIBUTE_DEPRECATED: Declares that an entity is deprecated. @@ -202,11 +205,15 @@ AC_DEFUN([gl_COMMON_BODY], [ - enumeration, enumeration item, - typedef, in C++ also: namespace, class, template specialization. */ -#if _GL_HAS_C_ATTRIBUTE (deprecated) -# define _GL_ATTRIBUTE_DEPRECATED [[__deprecated__]] -#elif _GL_HAS_ATTRIBUTE (deprecated) +#ifdef __has_c_attribute +# if __has_c_attribute (__deprecated__) +# define _GL_ATTRIBUTE_DEPRECATED [[__deprecated__]] +# endif +#endif +#if !defined _GL_ATTRIBUTE_DEPRECATED && _GL_HAS_ATTRIBUTE (deprecated) # define _GL_ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__)) -#else +#endif +#ifndef _GL_ATTRIBUTE_DEPRECATED # define _GL_ATTRIBUTE_DEPRECATED #endif @@ -240,11 +247,15 @@ AC_DEFUN([gl_COMMON_BODY], [ 'default' label. The compiler should not warn in this case. */ /* Applies to: Empty statement (;), inside a 'switch' statement. */ /* Always expands to something. */ -#if _GL_HAS_C_ATTRIBUTE (fallthrough) -# define _GL_ATTRIBUTE_FALLTHROUGH [[__fallthrough__]] -#elif _GL_HAS_ATTRIBUTE (fallthrough) +#ifdef __has_c_attribute +# if __has_c_attribute (__fallthrough__) +# define _GL_ATTRIBUTE_FALLTHROUGH [[__fallthrough__]] +# endif +#endif +#if !defined _GL_ATTRIBUTE_FALLTHROUGH && _GL_HAS_ATTRIBUTE (fallthrough) # define _GL_ATTRIBUTE_FALLTHROUGH __attribute__ ((__fallthrough__)) -#else +#endif +#ifndef _GL_ATTRIBUTE_FALLTHROUGH # define _GL_ATTRIBUTE_FALLTHROUGH ((void) 0) #endif @@ -305,12 +316,15 @@ AC_DEFUN([gl_COMMON_BODY], [ - enumeration, enumeration item, - typedef, in C++ also: class. */ -/* In C++ and C2x, this is spelled [[__maybe_unused__]]. +/* In C++ and C23, this is spelled [[__maybe_unused__]]. GCC's syntax is __attribute__ ((__unused__)). clang supports both syntaxes. */ -#if _GL_HAS_C_ATTRIBUTE (maybe_unused) -# define _GL_ATTRIBUTE_MAYBE_UNUSED [[__maybe_unused__]] -#else +#ifdef __has_c_attribute +# if __has_c_attribute (__maybe_unused__) +# define _GL_ATTRIBUTE_MAYBE_UNUSED [[__maybe_unused__]] +# endif +#endif +#ifndef _GL_ATTRIBUTE_MAYBE_UNUSED # define _GL_ATTRIBUTE_MAYBE_UNUSED _GL_ATTRIBUTE_UNUSED #endif /* Alternative spelling of this macro, for convenience and for @@ -323,11 +337,15 @@ AC_DEFUN([gl_COMMON_BODY], [ discard the return value. The compiler may warn if the caller does not use the return value, unless the caller uses something like ignore_value. */ /* Applies to: function, enumeration, class. */ -#if _GL_HAS_C_ATTRIBUTE (nodiscard) -# define _GL_ATTRIBUTE_NODISCARD [[__nodiscard__]] -#elif _GL_HAS_ATTRIBUTE (warn_unused_result) +#ifdef __has_c_attribute +# if __has_c_attribute (__nodiscard__) +# define _GL_ATTRIBUTE_NODISCARD [[__nodiscard__]] +# endif +#endif +#if !defined _GL_ATTRIBUTE_NODISCARD && _GL_HAS_ATTRIBUTE (warn_unused_result) # define _GL_ATTRIBUTE_NODISCARD __attribute__ ((__warn_unused_result__)) -#else +#endif +#ifndef _GL_ATTRIBUTE_NODISCARD # define _GL_ATTRIBUTE_NODISCARD #endif @@ -1005,6 +1023,30 @@ AC_DEFUN([gl_CONDITIONAL_HEADER], m4_popdef([gl_header_name]) ]) +dnl gl_CHECK_FUNCS_ANDROID([func], [[#include <foo.h>]]) +dnl is like AC_CHECK_FUNCS([func]), taking into account a portability problem +dnl on Android. +dnl Namely, if func was added to Android API level, say, 28, then the libc.so +dnl has the symbol func always, whereas the header file <foo.h> declares func +dnl conditionally: +dnl #if __ANDROID_API__ >= 28 +dnl ... func (...) __INTRODUCED_IN(28); +dnl #endif +dnl Thus, when compiling with "clang -target armv7a-unknown-linux-android28", +dnl the function func is declared and exists in libc. +dnl Whereas when compiling with "clang -target armv7a-unknown-linux-android27", +dnl the function func is not declared but exists in libc. We need to treat this +dnl case like the case where func does not exist. +AC_DEFUN([gl_CHECK_FUNCS_ANDROID], +[ + AC_CHECK_DECL([$1], , , [$2]) + if test $ac_cv_have_decl_[$1] = yes; then + AC_CHECK_FUNCS([$1]) + else + ac_cv_func_[$1]=no + fi +]) + dnl Expands to some code for use in .c programs that, on native Windows, defines dnl the Microsoft deprecated alias function names to the underscore-prefixed dnl actual function names. With this macro, these function names are available |