1 # gnulib-common.m4 serial 33 2 dnl Copyright (C) 2007-2012 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 # gl_COMMON 8 # is expanded unconditionally through gnulib-tool magic. 9 AC_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 ]) 14 AC_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 /* The __pure__ attribute was added in gcc 2.96. */ 53 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) 54 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__)) 55 #else 56 # define _GL_ATTRIBUTE_PURE /* empty */ 57 #endif 58 59 /* The __const__ attribute was added in gcc 2.95. */ 60 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95) 61 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__)) 62 #else 63 # define _GL_ATTRIBUTE_CONST /* empty */ 64 #endif 65 ]) 66 dnl Preparation for running test programs: 67 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not 68 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics 69 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N. 70 LIBC_FATAL_STDERR_=1 71 export LIBC_FATAL_STDERR_ 72 ]) 73 74 # gl_MODULE_INDICATOR_CONDITION 75 # expands to a C preprocessor expression that evaluates to 1 or 0, depending 76 # whether a gnulib module that has been requested shall be considered present 77 # or not. 78 m4_define([gl_MODULE_INDICATOR_CONDITION], [1]) 79 80 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename]) 81 # sets the shell variable that indicates the presence of the given module to 82 # a C preprocessor expression that will evaluate to 1. 83 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE], 84 [ 85 gl_MODULE_INDICATOR_SET_VARIABLE_AUX( 86 [GNULIB_[]m4_translit([[$1]], 87 [abcdefghijklmnopqrstuvwxyz./-], 88 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])], 89 [gl_MODULE_INDICATOR_CONDITION]) 90 ]) 91 92 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable]) 93 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION. 94 # The shell variable's value is a C preprocessor expression that evaluates 95 # to 0 or 1. 96 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX], 97 [ 98 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1], 99 [ 100 dnl Simplify the expression VALUE || 1 to 1. 101 $1=1 102 ], 103 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1], 104 [gl_MODULE_INDICATOR_CONDITION])]) 105 ]) 106 107 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition]) 108 # modifies the shell variable to include the given condition. The shell 109 # variable's value is a C preprocessor expression that evaluates to 0 or 1. 110 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR], 111 [ 112 dnl Simplify the expression 1 || CONDITION to 1. 113 if test "$[]$1" != 1; then 114 dnl Simplify the expression 0 || CONDITION to CONDITION. 115 if test "$[]$1" = 0; then 116 $1=$2 117 else 118 $1="($[]$1 || $2)" 119 fi 120 fi 121 ]) 122 123 # gl_MODULE_INDICATOR([modulename]) 124 # defines a C macro indicating the presence of the given module 125 # in a location where it can be used. 126 # | Value | Value | 127 # | in lib/ | in tests/ | 128 # --------------------------------------------+---------+-----------+ 129 # Module present among main modules: | 1 | 1 | 130 # --------------------------------------------+---------+-----------+ 131 # Module present among tests-related modules: | 0 | 1 | 132 # --------------------------------------------+---------+-----------+ 133 # Module not present at all: | 0 | 0 | 134 # --------------------------------------------+---------+-----------+ 135 AC_DEFUN([gl_MODULE_INDICATOR], 136 [ 137 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]], 138 [abcdefghijklmnopqrstuvwxyz./-], 139 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), 140 [gl_MODULE_INDICATOR_CONDITION], 141 [Define to a C preprocessor expression that evaluates to 1 or 0, 142 depending whether the gnulib module $1 shall be considered present.]) 143 ]) 144 145 # gl_MODULE_INDICATOR_FOR_TESTS([modulename]) 146 # defines a C macro indicating the presence of the given module 147 # in lib or tests. This is useful to determine whether the module 148 # should be tested. 149 # | Value | Value | 150 # | in lib/ | in tests/ | 151 # --------------------------------------------+---------+-----------+ 152 # Module present among main modules: | 1 | 1 | 153 # --------------------------------------------+---------+-----------+ 154 # Module present among tests-related modules: | 1 | 1 | 155 # --------------------------------------------+---------+-----------+ 156 # Module not present at all: | 0 | 0 | 157 # --------------------------------------------+---------+-----------+ 158 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], 159 [ 160 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]], 161 [abcdefghijklmnopqrstuvwxyz./-], 162 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1], 163 [Define to 1 when the gnulib module $1 should be tested.]) 164 ]) 165 166 # gl_ASSERT_NO_GNULIB_POSIXCHECK 167 # asserts that there will never be a need to #define GNULIB_POSIXCHECK. 168 # and thereby enables an optimization of configure and config.h. 169 # Used by Emacs. 170 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK], 171 [ 172 dnl Override gl_WARN_ON_USE_PREPARE. 173 dnl But hide this definition from 'aclocal'. 174 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], []) 175 ]) 176 177 # gl_ASSERT_NO_GNULIB_TESTS 178 # asserts that there will be no gnulib tests in the scope of the configure.ac 179 # and thereby enables an optimization of config.h. 180 # Used by Emacs. 181 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS], 182 [ 183 dnl Override gl_MODULE_INDICATOR_FOR_TESTS. 184 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], []) 185 ]) 186 187 # Test whether <features.h> exists. 188 # Set HAVE_FEATURES_H. 189 AC_DEFUN([gl_FEATURES_H], 190 [ 191 AC_CHECK_HEADERS_ONCE([features.h]) 192 if test $ac_cv_header_features_h = yes; then 193 HAVE_FEATURES_H=1 194 else 195 HAVE_FEATURES_H=0 196 fi 197 AC_SUBST([HAVE_FEATURES_H]) 198 ]) 199 200 # m4_foreach_w 201 # is a backport of autoconf-2.59c's m4_foreach_w. 202 # Remove this macro when we can assume autoconf >= 2.60. 203 m4_ifndef([m4_foreach_w], 204 [m4_define([m4_foreach_w], 205 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])]) 206 207 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH]) 208 # ---------------------------------------------------- 209 # Backport of autoconf-2.63b's macro. 210 # Remove this macro when we can assume autoconf >= 2.64. 211 m4_ifndef([AS_VAR_IF], 212 [m4_define([AS_VAR_IF], 213 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])]) 214 215 # gl_PROG_CC_C99 216 # Modifies the value of the shell variable CC in an attempt to make $CC 217 # understand ISO C99 source code. 218 # This is like AC_PROG_CC_C99, except that 219 # - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60, 220 # - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC 221 # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00367.html>, 222 # but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99 223 # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00441.html>. 224 # Remaining problems: 225 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options 226 # to CC twice 227 # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00431.html>. 228 # - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard. 229 AC_DEFUN([gl_PROG_CC_C99], 230 [ 231 dnl Change that version number to the minimum Autoconf version that supports 232 dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls. 233 m4_version_prereq([9.0], 234 [AC_REQUIRE([AC_PROG_CC_C99])], 235 [AC_REQUIRE([AC_PROG_CC_STDC])]) 236 ]) 237 238 # gl_PROG_AR_RANLIB 239 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler. 240 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override 241 # the values. 242 AC_DEFUN([gl_PROG_AR_RANLIB], 243 [ 244 dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler 245 dnl as "cc", and GCC as "gcc". They have different object file formats and 246 dnl library formats. In particular, the GNU binutils programs ar, ranlib 247 dnl produce libraries that work only with gcc, not with cc. 248 AC_REQUIRE([AC_PROG_CC]) 249 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler], 250 [ 251 AC_EGREP_CPP([Amsterdam], 252 [ 253 #ifdef __ACK__ 254 Amsterdam 255 #endif 256 ], 257 [gl_cv_c_amsterdam_compiler=yes], 258 [gl_cv_c_amsterdam_compiler=no]) 259 ]) 260 if test -z "$AR"; then 261 if test $gl_cv_c_amsterdam_compiler = yes; then 262 AR='cc -c.a' 263 if test -z "$ARFLAGS"; then 264 ARFLAGS='-o' 265 fi 266 else 267 dnl Use the Automake-documented default values for AR and ARFLAGS, 268 dnl but prefer ${host}-ar over ar (useful for cross-compiling). 269 AC_CHECK_TOOL([AR], [ar], [ar]) 270 if test -z "$ARFLAGS"; then 271 ARFLAGS='cru' 272 fi 273 fi 274 else 275 if test -z "$ARFLAGS"; then 276 ARFLAGS='cru' 277 fi 278 fi 279 AC_SUBST([AR]) 280 AC_SUBST([ARFLAGS]) 281 if test -z "$RANLIB"; then 282 if test $gl_cv_c_amsterdam_compiler = yes; then 283 RANLIB=':' 284 else 285 dnl Use the ranlib program if it is available. 286 AC_PROG_RANLIB 287 fi 288 fi 289 AC_SUBST([RANLIB]) 290 ]) 291 292 # AC_PROG_MKDIR_P 293 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix 294 # for interoperability with automake-1.9.6 from autoconf-2.62. 295 # Remove this macro when we can assume autoconf >= 2.62 or 296 # autoconf >= 2.60 && automake >= 1.10. 297 m4_ifdef([AC_PROG_MKDIR_P], [ 298 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed. 299 m4_define([AC_PROG_MKDIR_P], 300 m4_defn([AC_PROG_MKDIR_P])[ 301 AC_SUBST([MKDIR_P])])], [ 302 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P. 303 AC_DEFUN_ONCE([AC_PROG_MKDIR_P], 304 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake 305 MKDIR_P='$(mkdir_p)' 306 AC_SUBST([MKDIR_P])])]) 307 308 # AC_C_RESTRICT 309 # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61, 310 # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++ 311 # works. 312 # This definition can be removed once autoconf >= 2.62 can be assumed. 313 m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[ 314 AC_DEFUN([AC_C_RESTRICT], 315 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict], 316 [ac_cv_c_restrict=no 317 # The order here caters to the fact that C++ does not require restrict. 318 for ac_kw in __restrict __restrict__ _Restrict restrict; do 319 AC_COMPILE_IFELSE([AC_LANG_PROGRAM( 320 [[typedef int * int_ptr; 321 int foo (int_ptr $ac_kw ip) { 322 return ip[0]; 323 }]], 324 [[int s[1]; 325 int * $ac_kw t = s; 326 t[0] = 0; 327 return foo(t)]])], 328 [ac_cv_c_restrict=$ac_kw]) 329 test "$ac_cv_c_restrict" != no && break 330 done 331 ]) 332 AH_VERBATIM([restrict], 333 [/* Define to the equivalent of the C99 'restrict' keyword, or to 334 nothing if this is not supported. Do not define if restrict is 335 supported directly. */ 336 #undef restrict 337 /* Work around a bug in Sun C++: it does not support _Restrict, even 338 though the corresponding Sun C compiler does, which causes 339 "#define restrict _Restrict" in the previous line. Perhaps some future 340 version of Sun C++ will work with _Restrict; if so, it'll probably 341 define __RESTRICT, just as Sun C does. */ 342 #if defined __SUNPRO_CC && !defined __RESTRICT 343 # define _Restrict 344 #endif]) 345 case $ac_cv_c_restrict in 346 restrict) ;; 347 no) AC_DEFINE([restrict], []) ;; 348 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;; 349 esac 350 ]) 351 ]) 352 353 # gl_BIGENDIAN 354 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd. 355 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some 356 # macros invoke AC_C_BIGENDIAN with arguments. 357 AC_DEFUN([gl_BIGENDIAN], 358 [ 359 AC_C_BIGENDIAN 360 ]) 361 362 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it) 363 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not 364 # output a spurious "(cached)" mark in the midst of other configure output. 365 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded 366 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair. 367 AC_DEFUN([gl_CACHE_VAL_SILENT], 368 [ 369 saved_as_echo_n="$as_echo_n" 370 as_echo_n=':' 371 AC_CACHE_VAL([$1], [$2]) 372 as_echo_n="$saved_as_echo_n" 373 ]) 374
