2 # This is a collection of useful autoconf macros
5 ############################################
6 # Check if the compiler handles c99 struct initialization, and if not try -AC99 and -c99 flags
7 # Usage: LIBREPLACE_C99_STRUCT_INIT(success-action,failure-action)
8 # changes CFLAGS to add -AC99 or -c99 if needed
9 AC_DEFUN([LIBREPLACE_C99_STRUCT_INIT],
11 saved_CFLAGS="$CFLAGS";
13 if test x"$c99_init" = x"no"; then
14 AC_MSG_CHECKING(for C99 designated initializers)
15 CFLAGS="$saved_CFLAGS";
16 AC_TRY_COMPILE([#include <stdio.h>],
17 [ struct foo {int x;char y;};
18 struct foo bar = { .y = 'X', .x = 1 };
20 [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
22 if test x"$c99_init" = x"no"; then
23 AC_MSG_CHECKING(for C99 designated initializers with -AC99)
24 CFLAGS="$saved_CFLAGS -AC99";
25 AC_TRY_COMPILE([#include <stdio.h>],
26 [ struct foo {int x;char y;};
27 struct foo bar = { .y = 'X', .x = 1 };
29 [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
31 if test x"$c99_init" = x"no"; then
32 AC_MSG_CHECKING(for C99 designated initializers with -qlanglvl=extc99)
33 CFLAGS="$saved_CFLAGS -qlanglvl=extc99";
34 AC_TRY_COMPILE([#include <stdio.h>],
35 [ struct foo {int x;char y;};
36 struct foo bar = { .y = 'X', .x = 1 };
38 [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
40 if test x"$c99_init" = x"no"; then
41 AC_MSG_CHECKING(for C99 designated initializers with -qlanglvl=stdc99)
42 CFLAGS="$saved_CFLAGS -qlanglvl=stdc99";
43 AC_TRY_COMPILE([#include <stdio.h>],
44 [ struct foo {int x;char y;};
45 struct foo bar = { .y = 'X', .x = 1 };
47 [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
49 if test x"$c99_init" = x"no"; then
50 AC_MSG_CHECKING(for C99 designated initializers with -c99)
51 CFLAGS="$saved_CFLAGS -c99"
52 AC_TRY_COMPILE([#include <stdio.h>],
53 [ struct foo {int x;char y;};
54 struct foo bar = { .y = 'X', .x = 1 };
56 [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
59 if test "`uname`" = "HP-UX"; then
60 if test "$ac_cv_c_compiler_gnu" = no; then
61 # special override for broken HP-UX compiler - I can't find a way to test
62 # this properly (its a compiler bug)
63 CFLAGS="$CFLAGS -AC99";
68 if test x"$c99_init" = x"yes"; then
72 CFLAGS="$saved_CFLAGS"
78 dnl AC_PROG_CC_FLAG(flag)
79 AC_DEFUN(AC_PROG_CC_FLAG,
80 [AC_CACHE_CHECK(whether ${CC-cc} accepts -$1, ac_cv_prog_cc_$1,
81 [echo 'void f(){}' > conftest.c
82 if test -z "`${CC-cc} -$1 -c conftest.c 2>&1`"; then
90 AC_DEFUN([AC_EXTENSION_FLAG],
92 cat >>confdefs.h <<\EOF
97 AH_VERBATIM([$1], [#ifndef $1
103 dnl see if a declaration exists for a function or variable
104 dnl defines HAVE_function_DECL if it exists
105 dnl AC_HAVE_DECL(var, includes)
106 AC_DEFUN(AC_HAVE_DECL,
108 AC_CACHE_CHECK([for $1 declaration],ac_cv_have_$1_decl,[
109 AC_TRY_COMPILE([$2],[int i = (int)$1],
110 ac_cv_have_$1_decl=yes,ac_cv_have_$1_decl=no)])
111 if test x"$ac_cv_have_$1_decl" = x"yes"; then
112 AC_DEFINE([HAVE_]translit([$1], [a-z], [A-Z])[_DECL],1,[Whether $1() is available])
117 # AC_CHECK_LIB_EXT(LIBRARY, [EXT_LIBS], [FUNCTION],
118 # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
119 # [ADD-ACTION-IF-FOUND],[OTHER-LIBRARIES])
120 # ------------------------------------------------------
122 # Use a cache variable name containing both the library and function name,
123 # because the test really is for library $1 defining function $3, not
124 # just for library $1. Separate tests with the same $1 and different $3s
125 # may have different results.
127 # Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$3])
128 # is asking for trouble, since AC_CHECK_LIB($lib, fun) would give
129 # ac_cv_lib_$lib_fun, which is definitely not what was meant. Hence
130 # the AS_LITERAL_IF indirection.
132 # FIXME: This macro is extremely suspicious. It DEFINEs unconditionally,
133 # whatever the FUNCTION, in addition to not being a *S macro. Note
134 # that the cache does depend upon the function we are looking for.
136 # It is on purpose we used `ac_check_lib_ext_save_LIBS' and not just
137 # `ac_save_LIBS': there are many macros which don't want to see `LIBS'
138 # changed but still want to use AC_CHECK_LIB_EXT, so they save `LIBS'.
139 # And ``ac_save_LIBS' is too tempting a name, so let's leave them some
141 AC_DEFUN([AC_CHECK_LIB_EXT],
143 AH_CHECK_LIB_EXT([$1])
144 ac_check_lib_ext_save_LIBS=$LIBS
145 LIBS="-l$1 $$2 $7 $LIBS"
147 [AS_VAR_PUSHDEF([ac_Lib_ext], [ac_cv_lib_ext_$1])],
148 [AS_VAR_PUSHDEF([ac_Lib_ext], [ac_cv_lib_ext_$1''])])dnl
152 AH_CHECK_FUNC_EXT([$3])
154 [AS_VAR_PUSHDEF([ac_Lib_func], [ac_cv_lib_ext_$1_$3])],
155 [AS_VAR_PUSHDEF([ac_Lib_func], [ac_cv_lib_ext_$1''_$3])])dnl
156 AC_CACHE_CHECK([for $3 in -l$1], ac_Lib_func,
157 [AC_TRY_LINK_FUNC($3,
158 [AS_VAR_SET(ac_Lib_func, yes);
159 AS_VAR_SET(ac_Lib_ext, yes)],
160 [AS_VAR_SET(ac_Lib_func, no);
161 AS_VAR_SET(ac_Lib_ext, no)])
163 AS_IF([test AS_VAR_GET(ac_Lib_func) = yes],
164 [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$3))])dnl
165 AS_VAR_POPDEF([ac_Lib_func])dnl
167 AC_CACHE_CHECK([for -l$1], ac_Lib_ext,
168 [AC_TRY_LINK_FUNC([main],
169 [AS_VAR_SET(ac_Lib_ext, yes)],
170 [AS_VAR_SET(ac_Lib_ext, no)])
173 LIBS=$ac_check_lib_ext_save_LIBS
175 AS_IF([test AS_VAR_GET(ac_Lib_ext) = yes],
177 [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
188 AS_VAR_POPDEF([ac_Lib_ext])dnl
191 # AH_CHECK_LIB_EXT(LIBNAME)
192 # ---------------------
193 m4_define([AH_CHECK_LIB_EXT],
194 [AH_TEMPLATE(AS_TR_CPP(HAVE_LIB$1),
195 [Define to 1 if you have the `]$1[' library (-l]$1[).])])
197 dnl AC_SEARCH_LIBS_EXT(FUNCTION, SEARCH-LIBS, EXT_LIBS,
198 dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
199 dnl [OTHER-LIBRARIES])
200 dnl --------------------------------------------------------
201 dnl Search for a library defining FUNC, if it's not already available.
202 AC_DEFUN([AC_SEARCH_LIBS_EXT],
203 [AC_CACHE_CHECK([for library containing $1], [ac_cv_search_ext_$1],
205 ac_func_search_ext_save_LIBS=$LIBS
206 ac_cv_search_ext_$1=no
207 AC_LINK_IFELSE([AC_LANG_CALL([], [$1])],
208 [ac_cv_search_ext_$1="none required"])
209 if test "$ac_cv_search_ext_$1" = no; then
211 LIBS="-l$ac_lib $$3 $6 $ac_func_search_save_ext_LIBS"
212 AC_LINK_IFELSE([AC_LANG_CALL([], [$1])],
213 [ac_cv_search_ext_$1="-l$ac_lib"
217 LIBS=$ac_func_search_ext_save_LIBS])
218 AS_IF([test "$ac_cv_search_ext_$1" != no],
219 [test "$ac_cv_search_ext_$1" = "none required" || $3="$ac_cv_search_ext_$1 $$3"
224 dnl check for a function in a $LIBS and $OTHER_LIBS libraries variable.
225 dnl AC_CHECK_FUNC_EXT(func,OTHER_LIBS,IF-TRUE,IF-FALSE)
226 AC_DEFUN([AC_CHECK_FUNC_EXT],
228 AH_CHECK_FUNC_EXT($1)
229 ac_check_func_ext_save_LIBS=$LIBS
231 AS_VAR_PUSHDEF([ac_var], [ac_cv_func_ext_$1])dnl
232 AC_CACHE_CHECK([for $1], ac_var,
233 [AC_LINK_IFELSE([AC_LANG_FUNC_LINK_TRY([$1])],
234 [AS_VAR_SET(ac_var, yes)],
235 [AS_VAR_SET(ac_var, no)])])
236 LIBS=$ac_check_func_ext_save_LIBS
237 AS_IF([test AS_VAR_GET(ac_var) = yes],
238 [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1])) $3],
240 AS_VAR_POPDEF([ac_var])dnl
243 # AH_CHECK_FUNC_EXT(FUNCNAME)
244 # ---------------------
245 m4_define([AH_CHECK_FUNC_EXT],
246 [AH_TEMPLATE(AS_TR_CPP(HAVE_$1),
247 [Define to 1 if you have the `]$1[' function.])])
249 dnl Define an AC_DEFINE with ifndef guard.
250 dnl AC_N_DEFINE(VARIABLE [, VALUE])
252 [cat >> confdefs.h <<\EOF
254 [#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
260 dnl AC_ADD_INCLUDE(VARIABLE)
261 define(AC_ADD_INCLUDE,
262 [cat >> confdefs.h <<\EOF
267 dnl AS_HELP_STRING is not available in autoconf 2.57, and AC_HELP_STRING is deprecated
268 dnl in autoconf 2.59, so define AS_HELP_STRING to be AC_HELP_STRING unless it is already
270 m4_ifdef([AS_HELP_STRING], , [m4_define([AS_HELP_STRING], m4_defn([AC_HELP_STRING]))])
272 dnl check if the prototype in the header matches the given one
273 dnl AC_VERIFY_C_PROTOTYPE(prototype,functionbody,[IF-TRUE].[IF-FALSE],[extraheaders])
274 AC_DEFUN(AC_VERIFY_C_PROTOTYPE,
275 [AC_CACHE_CHECK([for prototype $1], AS_TR_SH([ac_cv_c_prototype_$1]),
284 AS_TR_SH([ac_cv_c_prototype_$1])=yes
286 AS_TR_SH([ac_cv_c_prototype_$1])=no
289 AS_IF([test $AS_TR_SH([ac_cv_c_prototype_$1]) = yes],[$3],[$4])