m4/gnulib-common.m4

   1 # gnulib-common.m4 serial 31
   2 dnl Copyright (C) 2007-2011 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 draft C1X.  */
  17 #ifndef _Noreturn
  18 # if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \
  19       || 0x5110 <= __SUNPRO_C)
  20 #  define _Noreturn __attribute__ ((__noreturn__))
  21 # elif 1200 <= _MSC_VER
  22 #  define _Noreturn __declspec (noreturn)
  23 # else
  24 #  define _Noreturn
  25 # endif
  26 #endif
  27 ])
  28   AH_VERBATIM([isoc99_inline],
  29 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
  30    the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
  31    earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
  32    __APPLE__ && __MACH__ test for MacOS X.
  33    __APPLE_CC__ tests for the Apple compiler and its version.
  34    __STDC_VERSION__ tests for the C99 mode.  */
  35 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
  36 # define __GNUC_STDC_INLINE__ 1
  37 #endif])
  38   AH_VERBATIM([unused_parameter],
  39 [/* Define as a marker that can be attached to declarations that might not
  40     be used.  This helps to reduce warnings, such as from
  41     GCC -Wunused-parameter.  */
  42 #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
  43 # define _GL_UNUSED __attribute__ ((__unused__))
  44 #else
  45 # define _GL_UNUSED
  46 #endif
  47 /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
  48    is a misnomer outside of parameter lists.  */
  49 #define _UNUSED_PARAMETER_ _GL_UNUSED
  50
  51 /* The __pure__ attribute was added in gcc 2.96.  */
  52 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
  53 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
  54 #else
  55 # define _GL_ATTRIBUTE_PURE /* empty */
  56 #endif
  57
  58 /* The __const__ attribute was added in gcc 2.95.  */
  59 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
  60 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
  61 #else
  62 # define _GL_ATTRIBUTE_CONST /* empty */
  63 #endif
  64 ])
  65   dnl Preparation for running test programs:
  66   dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
  67   dnl to /dev/tty, so they can be redirected to log files.  Such diagnostics
  68   dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
  69   LIBC_FATAL_STDERR_=1
  70   export LIBC_FATAL_STDERR_
  71 ])
  72
  73 # gl_MODULE_INDICATOR_CONDITION
  74 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
  75 # whether a gnulib module that has been requested shall be considered present
  76 # or not.
  77 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
  78
  79 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
  80 # sets the shell variable that indicates the presence of the given module to
  81 # a C preprocessor expression that will evaluate to 1.
  82 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
  83 [
  84   gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
  85     [GNULIB_[]m4_translit([[$1]],
  86                           [abcdefghijklmnopqrstuvwxyz./-],
  87                           [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
  88     [gl_MODULE_INDICATOR_CONDITION])
  89 ])
  90
  91 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
  92 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
  93 # The shell variable's value is a C preprocessor expression that evaluates
  94 # to 0 or 1.
  95 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
  96 [
  97   m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
  98     [
  99      dnl Simplify the expression VALUE || 1 to 1.
 100      $1=1
 101     ],
 102     [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
 103                                              [gl_MODULE_INDICATOR_CONDITION])])
 104 ])
 105
 106 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
 107 # modifies the shell variable to include the given condition.  The shell
 108 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
 109 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
 110 [
 111   dnl Simplify the expression 1 || CONDITION to 1.
 112   if test "$[]$1" != 1; then
 113     dnl Simplify the expression 0 || CONDITION to CONDITION.
 114     if test "$[]$1" = 0; then
 115       $1=$2
 116     else
 117       $1="($[]$1 || $2)"
 118     fi
 119   fi
 120 ])
 121
 122 # gl_MODULE_INDICATOR([modulename])
 123 # defines a C macro indicating the presence of the given module
 124 # in a location where it can be used.
 125 #                                             |  Value  |   Value   |
 126 #                                             | in lib/ | in tests/ |
 127 # --------------------------------------------+---------+-----------+
 128 # Module present among main modules:          |    1    |     1     |
 129 # --------------------------------------------+---------+-----------+
 130 # Module present among tests-related modules: |    0    |     1     |
 131 # --------------------------------------------+---------+-----------+
 132 # Module not present at all:                  |    0    |     0     |
 133 # --------------------------------------------+---------+-----------+
 134 AC_DEFUN([gl_MODULE_INDICATOR],
 135 [
 136   AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
 137       [abcdefghijklmnopqrstuvwxyz./-],
 138       [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
 139     [gl_MODULE_INDICATOR_CONDITION],
 140     [Define to a C preprocessor expression that evaluates to 1 or 0,
 141      depending whether the gnulib module $1 shall be considered present.])
 142 ])
 143
 144 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
 145 # defines a C macro indicating the presence of the given module
 146 # in lib or tests. This is useful to determine whether the module
 147 # should be tested.
 148 #                                             |  Value  |   Value   |
 149 #                                             | in lib/ | in tests/ |
 150 # --------------------------------------------+---------+-----------+
 151 # Module present among main modules:          |    1    |     1     |
 152 # --------------------------------------------+---------+-----------+
 153 # Module present among tests-related modules: |    1    |     1     |
 154 # --------------------------------------------+---------+-----------+
 155 # Module not present at all:                  |    0    |     0     |
 156 # --------------------------------------------+---------+-----------+
 157 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
 158 [
 159   AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
 160       [abcdefghijklmnopqrstuvwxyz./-],
 161       [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
 162     [Define to 1 when the gnulib module $1 should be tested.])
 163 ])
 164
 165 # gl_ASSERT_NO_GNULIB_POSIXCHECK
 166 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
 167 # and thereby enables an optimization of configure and config.h.
 168 # Used by Emacs.
 169 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
 170 [
 171   dnl Override gl_WARN_ON_USE_PREPARE.
 172   dnl But hide this definition from 'aclocal'.
 173   AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
 174 ])
 175
 176 # gl_ASSERT_NO_GNULIB_TESTS
 177 # asserts that there will be no gnulib tests in the scope of the configure.ac
 178 # and thereby enables an optimization of config.h.
 179 # Used by Emacs.
 180 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
 181 [
 182   dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
 183   AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
 184 ])
 185
 186 # Test whether <features.h> exists.
 187 # Set HAVE_FEATURES_H.
 188 AC_DEFUN([gl_FEATURES_H],
 189 [
 190   AC_CHECK_HEADERS_ONCE([features.h])
 191   if test $ac_cv_header_features_h = yes; then
 192     HAVE_FEATURES_H=1
 193   else
 194     HAVE_FEATURES_H=0
 195   fi
 196   AC_SUBST([HAVE_FEATURES_H])
 197 ])
 198
 199 # m4_foreach_w
 200 # is a backport of autoconf-2.59c's m4_foreach_w.
 201 # Remove this macro when we can assume autoconf >= 2.60.
 202 m4_ifndef([m4_foreach_w],
 203   [m4_define([m4_foreach_w],
 204     [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
 205
 206 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
 207 # ----------------------------------------------------
 208 # Backport of autoconf-2.63b's macro.
 209 # Remove this macro when we can assume autoconf >= 2.64.
 210 m4_ifndef([AS_VAR_IF],
 211 [m4_define([AS_VAR_IF],
 212 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
 213
 214 # gl_PROG_CC_C99
 215 # Modifies the value of the shell variable CC in an attempt to make $CC
 216 # understand ISO C99 source code.
 217 # This is like AC_PROG_CC_C99, except that
 218 # - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60,
 219 # - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
 220 #   <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00367.html>,
 221 #   but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
 222 #   <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00441.html>.
 223 # Remaining problems:
 224 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
 225 #   to CC twice
 226 #   <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00431.html>.
 227 # - AC_PROG_CC_STDC is likely to change when C1X is an ISO standard.
 228 AC_DEFUN([gl_PROG_CC_C99],
 229 [
 230   dnl Change that version number to the minimum Autoconf version that supports
 231   dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
 232   m4_version_prereq([9.0],
 233     [AC_REQUIRE([AC_PROG_CC_C99])],
 234     [AC_REQUIRE([AC_PROG_CC_STDC])])
 235 ])
 236
 237 # gl_PROG_AR_RANLIB
 238 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
 239 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
 240 # the values.
 241 AC_DEFUN([gl_PROG_AR_RANLIB],
 242 [
 243   dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
 244   dnl as "cc", and GCC as "gcc". They have different object file formats and
 245   dnl library formats. In particular, the GNU binutils programs ar, ranlib
 246   dnl produce libraries that work only with gcc, not with cc.
 247   AC_REQUIRE([AC_PROG_CC])
 248   AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
 249     [
 250       AC_EGREP_CPP([Amsterdam],
 251         [
 252 #ifdef __ACK__
 253 Amsterdam
 254 #endif
 255         ],
 256         [gl_cv_c_amsterdam_compiler=yes],
 257         [gl_cv_c_amsterdam_compiler=no])
 258     ])
 259   if test -z "$AR"; then
 260     if test $gl_cv_c_amsterdam_compiler = yes; then
 261       AR='cc -c.a'
 262       if test -z "$ARFLAGS"; then
 263         ARFLAGS='-o'
 264       fi
 265     else
 266       dnl Use the Automake-documented default values for AR and ARFLAGS,
 267       dnl but prefer ${host}-ar over ar (useful for cross-compiling).
 268       AC_CHECK_TOOL([AR], [ar], [ar])
 269       if test -z "$ARFLAGS"; then
 270         ARFLAGS='cru'
 271       fi
 272     fi
 273   else
 274     if test -z "$ARFLAGS"; then
 275       ARFLAGS='cru'
 276     fi
 277   fi
 278   AC_SUBST([AR])
 279   AC_SUBST([ARFLAGS])
 280   if test -z "$RANLIB"; then
 281     if test $gl_cv_c_amsterdam_compiler = yes; then
 282       RANLIB=':'
 283     else
 284       dnl Use the ranlib program if it is available.
 285       AC_PROG_RANLIB
 286     fi
 287   fi
 288   AC_SUBST([RANLIB])
 289 ])
 290
 291 # AC_PROG_MKDIR_P
 292 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
 293 # for interoperability with automake-1.9.6 from autoconf-2.62.
 294 # Remove this macro when we can assume autoconf >= 2.62 or
 295 # autoconf >= 2.60 && automake >= 1.10.
 296 m4_ifdef([AC_PROG_MKDIR_P], [
 297   dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
 298   m4_define([AC_PROG_MKDIR_P],
 299     m4_defn([AC_PROG_MKDIR_P])[
 300     AC_SUBST([MKDIR_P])])], [
 301   dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
 302   AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
 303     [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
 304      MKDIR_P='$(mkdir_p)'
 305      AC_SUBST([MKDIR_P])])])
 306
 307 # AC_C_RESTRICT
 308 # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
 309 # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
 310 # works.
 311 # This definition can be removed once autoconf >= 2.62 can be assumed.
 312 m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[
 313 AC_DEFUN([AC_C_RESTRICT],
 314 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
 315   [ac_cv_c_restrict=no
 316    # The order here caters to the fact that C++ does not require restrict.
 317    for ac_kw in __restrict __restrict__ _Restrict restrict; do
 318      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
 319       [[typedef int * int_ptr;
 320         int foo (int_ptr $ac_kw ip) {
 321         return ip[0];
 322        }]],
 323       [[int s[1];
 324         int * $ac_kw t = s;
 325         t[0] = 0;
 326         return foo(t)]])],
 327       [ac_cv_c_restrict=$ac_kw])
 328      test "$ac_cv_c_restrict" != no && break
 329    done
 330   ])
 331  AH_VERBATIM([restrict],
 332 [/* Define to the equivalent of the C99 'restrict' keyword, or to
 333    nothing if this is not supported.  Do not define if restrict is
 334    supported directly.  */
 335 #undef restrict
 336 /* Work around a bug in Sun C++: it does not support _Restrict, even
 337    though the corresponding Sun C compiler does, which causes
 338    "#define restrict _Restrict" in the previous line.  Perhaps some future
 339    version of Sun C++ will work with _Restrict; if so, it'll probably
 340    define __RESTRICT, just as Sun C does.  */
 341 #if defined __SUNPRO_CC && !defined __RESTRICT
 342 # define _Restrict
 343 #endif])
 344  case $ac_cv_c_restrict in
 345    restrict) ;;
 346    no) AC_DEFINE([restrict], []) ;;
 347    *)  AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
 348  esac
 349 ])
 350 ])
 351
 352 # gl_BIGENDIAN
 353 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
 354 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
 355 # macros invoke AC_C_BIGENDIAN with arguments.
 356 AC_DEFUN([gl_BIGENDIAN],
 357 [
 358   AC_C_BIGENDIAN
 359 ])
 360
 361 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
 362 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
 363 # output a spurious "(cached)" mark in the midst of other configure output.
 364 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
 365 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
 366 AC_DEFUN([gl_CACHE_VAL_SILENT],
 367 [
 368   saved_as_echo_n="$as_echo_n"
 369   as_echo_n=':'
 370   AC_CACHE_VAL([$1], [$2])
 371   as_echo_n="$saved_as_echo_n"
 372 ])