1# gnulib-common.m4 serial 36 2dnl Copyright (C) 2007-2016 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7# gl_COMMON 8# is expanded unconditionally through gnulib-tool magic. 9AC_DEFUN([gl_COMMON], [ 10 dnl Use AC_REQUIRE here, so that the code is expanded once only. 11 AC_REQUIRE([gl_00GNULIB]) 12 AC_REQUIRE([gl_COMMON_BODY]) 13]) 14AC_DEFUN([gl_COMMON_BODY], [ 15 AH_VERBATIM([_Noreturn], 16[/* The _Noreturn keyword of C11. */ 17#if ! (defined _Noreturn \ 18 || (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__)) 19# if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \ 20 || 0x5110 <= __SUNPRO_C) 21# define _Noreturn __attribute__ ((__noreturn__)) 22# elif defined _MSC_VER && 1200 <= _MSC_VER 23# define _Noreturn __declspec (noreturn) 24# else 25# define _Noreturn 26# endif 27#endif 28]) 29 AH_VERBATIM([isoc99_inline], 30[/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports 31 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of 32 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__. 33 __APPLE__ && __MACH__ test for Mac OS X. 34 __APPLE_CC__ tests for the Apple compiler and its version. 35 __STDC_VERSION__ tests for the C99 mode. */ 36#if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__ 37# define __GNUC_STDC_INLINE__ 1 38#endif]) 39 AH_VERBATIM([unused_parameter], 40[/* Define as a marker that can be attached to declarations that might not 41 be used. This helps to reduce warnings, such as from 42 GCC -Wunused-parameter. */ 43#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7) 44# define _GL_UNUSED __attribute__ ((__unused__)) 45#else 46# define _GL_UNUSED 47#endif 48/* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name 49 is a misnomer outside of parameter lists. */ 50#define _UNUSED_PARAMETER_ _GL_UNUSED 51 52/* gcc supports the "unused" attribute on possibly unused labels, and 53 g++ has since version 4.5. Note to support C++ as well as C, 54 _GL_UNUSED_LABEL should be used with a trailing ; */ 55#if !defined __cplusplus || __GNUC__ > 4 \ 56 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) 57# define _GL_UNUSED_LABEL _GL_UNUSED 58#else 59# define _GL_UNUSED_LABEL 60#endif 61 62/* The __pure__ attribute was added in gcc 2.96. */ 63#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) 64# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__)) 65#else 66# define _GL_ATTRIBUTE_PURE /* empty */ 67#endif 68 69/* The __const__ attribute was added in gcc 2.95. */ 70#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95) 71# define _GL_ATTRIBUTE_CONST __attribute__ ((__const__)) 72#else 73# define _GL_ATTRIBUTE_CONST /* empty */ 74#endif 75]) 76 dnl Preparation for running test programs: 77 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not 78 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics 79 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N. 80 LIBC_FATAL_STDERR_=1 81 export LIBC_FATAL_STDERR_ 82]) 83 84# gl_MODULE_INDICATOR_CONDITION 85# expands to a C preprocessor expression that evaluates to 1 or 0, depending 86# whether a gnulib module that has been requested shall be considered present 87# or not. 88m4_define([gl_MODULE_INDICATOR_CONDITION], [1]) 89 90# gl_MODULE_INDICATOR_SET_VARIABLE([modulename]) 91# sets the shell variable that indicates the presence of the given module to 92# a C preprocessor expression that will evaluate to 1. 93AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE], 94[ 95 gl_MODULE_INDICATOR_SET_VARIABLE_AUX( 96 [GNULIB_[]m4_translit([[$1]], 97 [abcdefghijklmnopqrstuvwxyz./-], 98 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])], 99 [gl_MODULE_INDICATOR_CONDITION]) 100]) 101 102# gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable]) 103# modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION. 104# The shell variable's value is a C preprocessor expression that evaluates 105# to 0 or 1. 106AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX], 107[ 108 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1], 109 [ 110 dnl Simplify the expression VALUE || 1 to 1. 111 $1=1 112 ], 113 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1], 114 [gl_MODULE_INDICATOR_CONDITION])]) 115]) 116 117# gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition]) 118# modifies the shell variable to include the given condition. The shell 119# variable's value is a C preprocessor expression that evaluates to 0 or 1. 120AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR], 121[ 122 dnl Simplify the expression 1 || CONDITION to 1. 123 if test "$[]$1" != 1; then 124 dnl Simplify the expression 0 || CONDITION to CONDITION. 125 if test "$[]$1" = 0; then 126 $1=$2 127 else 128 $1="($[]$1 || $2)" 129 fi 130 fi 131]) 132 133# gl_MODULE_INDICATOR([modulename]) 134# defines a C macro indicating the presence of the given module 135# in a location where it can be used. 136# | Value | Value | 137# | in lib/ | in tests/ | 138# --------------------------------------------+---------+-----------+ 139# Module present among main modules: | 1 | 1 | 140# --------------------------------------------+---------+-----------+ 141# Module present among tests-related modules: | 0 | 1 | 142# --------------------------------------------+---------+-----------+ 143# Module not present at all: | 0 | 0 | 144# --------------------------------------------+---------+-----------+ 145AC_DEFUN([gl_MODULE_INDICATOR], 146[ 147 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]], 148 [abcdefghijklmnopqrstuvwxyz./-], 149 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), 150 [gl_MODULE_INDICATOR_CONDITION], 151 [Define to a C preprocessor expression that evaluates to 1 or 0, 152 depending whether the gnulib module $1 shall be considered present.]) 153]) 154 155# gl_MODULE_INDICATOR_FOR_TESTS([modulename]) 156# defines a C macro indicating the presence of the given module 157# in lib or tests. This is useful to determine whether the module 158# should be tested. 159# | Value | Value | 160# | in lib/ | in tests/ | 161# --------------------------------------------+---------+-----------+ 162# Module present among main modules: | 1 | 1 | 163# --------------------------------------------+---------+-----------+ 164# Module present among tests-related modules: | 1 | 1 | 165# --------------------------------------------+---------+-----------+ 166# Module not present at all: | 0 | 0 | 167# --------------------------------------------+---------+-----------+ 168AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], 169[ 170 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]], 171 [abcdefghijklmnopqrstuvwxyz./-], 172 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1], 173 [Define to 1 when the gnulib module $1 should be tested.]) 174]) 175 176# gl_ASSERT_NO_GNULIB_POSIXCHECK 177# asserts that there will never be a need to #define GNULIB_POSIXCHECK. 178# and thereby enables an optimization of configure and config.h. 179# Used by Emacs. 180AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK], 181[ 182 dnl Override gl_WARN_ON_USE_PREPARE. 183 dnl But hide this definition from 'aclocal'. 184 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], []) 185]) 186 187# gl_ASSERT_NO_GNULIB_TESTS 188# asserts that there will be no gnulib tests in the scope of the configure.ac 189# and thereby enables an optimization of config.h. 190# Used by Emacs. 191AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS], 192[ 193 dnl Override gl_MODULE_INDICATOR_FOR_TESTS. 194 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], []) 195]) 196 197# Test whether <features.h> exists. 198# Set HAVE_FEATURES_H. 199AC_DEFUN([gl_FEATURES_H], 200[ 201 AC_CHECK_HEADERS_ONCE([features.h]) 202 if test $ac_cv_header_features_h = yes; then 203 HAVE_FEATURES_H=1 204 else 205 HAVE_FEATURES_H=0 206 fi 207 AC_SUBST([HAVE_FEATURES_H]) 208]) 209 210# m4_foreach_w 211# is a backport of autoconf-2.59c's m4_foreach_w. 212# Remove this macro when we can assume autoconf >= 2.60. 213m4_ifndef([m4_foreach_w], 214 [m4_define([m4_foreach_w], 215 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])]) 216 217# AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH]) 218# ---------------------------------------------------- 219# Backport of autoconf-2.63b's macro. 220# Remove this macro when we can assume autoconf >= 2.64. 221m4_ifndef([AS_VAR_IF], 222[m4_define([AS_VAR_IF], 223[AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])]) 224 225# gl_PROG_CC_C99 226# Modifies the value of the shell variable CC in an attempt to make $CC 227# understand ISO C99 source code. 228# This is like AC_PROG_CC_C99, except that 229# - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60, 230# - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC 231# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00367.html>, 232# but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99 233# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00441.html>. 234# Remaining problems: 235# - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options 236# to CC twice 237# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00431.html>. 238# - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard. 239AC_DEFUN([gl_PROG_CC_C99], 240[ 241 dnl Change that version number to the minimum Autoconf version that supports 242 dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls. 243 m4_version_prereq([9.0], 244 [AC_REQUIRE([AC_PROG_CC_C99])], 245 [AC_REQUIRE([AC_PROG_CC_STDC])]) 246]) 247 248# gl_PROG_AR_RANLIB 249# Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler. 250# The user can set the variables AR, ARFLAGS, RANLIB if he wants to override 251# the values. 252AC_DEFUN([gl_PROG_AR_RANLIB], 253[ 254 dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler 255 dnl as "cc", and GCC as "gcc". They have different object file formats and 256 dnl library formats. In particular, the GNU binutils programs ar and ranlib 257 dnl produce libraries that work only with gcc, not with cc. 258 AC_REQUIRE([AC_PROG_CC]) 259 AC_BEFORE([$0], [AM_PROG_AR]) 260 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler], 261 [ 262 AC_EGREP_CPP([Amsterdam], 263 [ 264#ifdef __ACK__ 265Amsterdam 266#endif 267 ], 268 [gl_cv_c_amsterdam_compiler=yes], 269 [gl_cv_c_amsterdam_compiler=no]) 270 ]) 271 272 dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not 273 dnl building with __ACK__. 274 if test $gl_cv_c_amsterdam_compiler = yes; then 275 if test -z "$AR"; then 276 AR='cc -c.a' 277 fi 278 if test -z "$ARFLAGS"; then 279 ARFLAGS='-o' 280 fi 281 else 282 dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST 283 dnl ARFLAGS variable (it is filed into Makefile.in directly by automake 284 dnl script on-demand, if not specified by ./configure of course). 285 dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above 286 dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block 287 dnl because AM_PROG_AR is written so it could re-set AR variable even for 288 dnl __ACK__. It may seem like its easier to avoid calling the macro here, 289 dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good 290 dnl default value and automake should usually know them). 291 m4_ifdef([AM_PROG_AR], [AM_PROG_AR], [:]) 292 fi 293 294 dnl In case the code above has not helped with setting AR/ARFLAGS, use 295 dnl Automake-documented default values for AR and ARFLAGS, but prefer 296 dnl ${host}-ar over ar (useful for cross-compiling). 297 AC_CHECK_TOOL([AR], [ar], [ar]) 298 if test -z "$ARFLAGS"; then 299 ARFLAGS='cr' 300 fi 301 302 AC_SUBST([AR]) 303 AC_SUBST([ARFLAGS]) 304 if test -z "$RANLIB"; then 305 if test $gl_cv_c_amsterdam_compiler = yes; then 306 RANLIB=':' 307 else 308 dnl Use the ranlib program if it is available. 309 AC_PROG_RANLIB 310 fi 311 fi 312 AC_SUBST([RANLIB]) 313]) 314 315# AC_PROG_MKDIR_P 316# is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix 317# for interoperability with automake-1.9.6 from autoconf-2.62. 318# Remove this macro when we can assume autoconf >= 2.62 or 319# autoconf >= 2.60 && automake >= 1.10. 320# AC_AUTOCONF_VERSION was introduced in 2.62, so use that as the witness. 321m4_ifndef([AC_AUTOCONF_VERSION],[ 322m4_ifdef([AC_PROG_MKDIR_P], [ 323 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed. 324 m4_define([AC_PROG_MKDIR_P], 325 m4_defn([AC_PROG_MKDIR_P])[ 326 AC_SUBST([MKDIR_P])])], [ 327 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P. 328 AC_DEFUN_ONCE([AC_PROG_MKDIR_P], 329 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake 330 MKDIR_P='$(mkdir_p)' 331 AC_SUBST([MKDIR_P])])]) 332]) 333 334# AC_C_RESTRICT 335# This definition is copied from post-2.69 Autoconf and overrides the 336# AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed 337# once autoconf >= 2.70 can be assumed. It's painful to check version 338# numbers, and in practice this macro is more up-to-date than Autoconf 339# is, so override Autoconf unconditionally. 340AC_DEFUN([AC_C_RESTRICT], 341[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict], 342 [ac_cv_c_restrict=no 343 # The order here caters to the fact that C++ does not require restrict. 344 for ac_kw in __restrict __restrict__ _Restrict restrict; do 345 AC_COMPILE_IFELSE( 346 [AC_LANG_PROGRAM( 347 [[typedef int *int_ptr; 348 int foo (int_ptr $ac_kw ip) { return ip[0]; } 349 int bar (int [$ac_kw]); /* Catch GCC bug 14050. */ 350 int bar (int ip[$ac_kw]) { return ip[0]; } 351 ]], 352 [[int s[1]; 353 int *$ac_kw t = s; 354 t[0] = 0; 355 return foo (t) + bar (t); 356 ]])], 357 [ac_cv_c_restrict=$ac_kw]) 358 test "$ac_cv_c_restrict" != no && break 359 done 360 ]) 361 AH_VERBATIM([restrict], 362[/* Define to the equivalent of the C99 'restrict' keyword, or to 363 nothing if this is not supported. Do not define if restrict is 364 supported directly. */ 365#undef restrict 366/* Work around a bug in Sun C++: it does not support _Restrict or 367 __restrict__, even though the corresponding Sun C compiler ends up with 368 "#define restrict _Restrict" or "#define restrict __restrict__" in the 369 previous line. Perhaps some future version of Sun C++ will work with 370 restrict; if so, hopefully it defines __RESTRICT like Sun C does. */ 371#if defined __SUNPRO_CC && !defined __RESTRICT 372# define _Restrict 373# define __restrict__ 374#endif]) 375 case $ac_cv_c_restrict in 376 restrict) ;; 377 no) AC_DEFINE([restrict], []) ;; 378 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;; 379 esac 380])# AC_C_RESTRICT 381 382# gl_BIGENDIAN 383# is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd. 384# Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some 385# macros invoke AC_C_BIGENDIAN with arguments. 386AC_DEFUN([gl_BIGENDIAN], 387[ 388 AC_C_BIGENDIAN 389]) 390 391# gl_CACHE_VAL_SILENT(cache-id, command-to-set-it) 392# is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not 393# output a spurious "(cached)" mark in the midst of other configure output. 394# This macro should be used instead of AC_CACHE_VAL when it is not surrounded 395# by an AC_MSG_CHECKING/AC_MSG_RESULT pair. 396AC_DEFUN([gl_CACHE_VAL_SILENT], 397[ 398 saved_as_echo_n="$as_echo_n" 399 as_echo_n=':' 400 AC_CACHE_VAL([$1], [$2]) 401 as_echo_n="$saved_as_echo_n" 402]) 403 404# AS_VAR_COPY was added in autoconf 2.63b 405m4_define_default([AS_VAR_COPY], 406[AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])]) 407 408# AC_PROG_SED was added in autoconf 2.59b 409m4_ifndef([AC_PROG_SED], 410[AC_DEFUN([AC_PROG_SED], 411[AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED, 412 [dnl ac_script should not contain more than 99 commands (for HP-UX sed), 413 dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed. 414 ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/ 415 for ac_i in 1 2 3 4 5 6 7; do 416 ac_script="$ac_script$as_nl$ac_script" 417 done 418 echo "$ac_script" 2>/dev/null | sed 99q >conftest.sed 419 AS_UNSET([ac_script]) 420 if test -z "$SED"; then 421 ac_path_SED_found=false 422 _AS_PATH_WALK([], [ 423 for ac_prog in sed gsed; do 424 for ac_exec_ext in '' $ac_executable_extensions; do 425 ac_path_SED="$as_dir/$ac_prog$ac_exec_ext" 426 AS_EXECUTABLE_P(["$ac_path_SED"]) || continue 427 case `"$ac_path_SED" --version 2>&1` in 428 *GNU*) ac_cv_path_SED=$ac_path_SED ac_path_SED_found=:;; 429 *) 430 ac_count=0 431 _AS_ECHO_N([0123456789]) >conftest.in 432 while : 433 do 434 cat conftest.in conftest.in >conftest.tmp 435 mv conftest.tmp conftest.in 436 cp conftest.in conftest.nl 437 echo >> conftest.nl 438 "$ac_path_SED" -f conftest.sed <conftest.nl >conftest.out 2>/dev/null || break 439 diff conftest.out conftest.nl >/dev/null 2>&1 || break 440 ac_count=`expr $ac_count + 1` 441 if test $ac_count -gt ${ac_path_SED_max-0}; then 442 # Best so far, but keep looking for better 443 ac_cv_path_SED=$ac_path_SED 444 ac_path_SED_max=$ac_count 445 fi 446 test $ac_count -gt 10 && break 447 done 448 rm -f conftest.in conftest.tmp conftest.nl conftest.out;; 449 esac 450 $ac_path_SED_found && break 3 451 done 452 done]) 453 if test -z "$ac_cv_path_SED"; then 454 AC_ERROR([no acceptable sed could be found in \$PATH]) 455 fi 456 else 457 ac_cv_path_SED=$SED 458 fi 459 SED="$ac_cv_path_SED" 460 AC_SUBST([SED])dnl 461 rm -f conftest.sed 462])])]) 463