acinclude.m4

   1 dnl  On the NeXT, #including <utime.h> doesn't give you a definition for
   2 dnl  struct utime, unless you #define _POSIX_SOURCE.
   3
   4 AC_DEFUN(GUILE_STRUCT_UTIMBUF, [
   5   AC_CACHE_CHECK([whether we need POSIX to get struct utimbuf],
   6     guile_cv_struct_utimbuf_needs_posix,
   7     [AC_TRY_CPP([
   8 #ifdef __EMX__
   9 #include <sys/utime.h>
  10 #else
  11 #include <utime.h>
  12 #endif
  13 struct utime blah;
  14 ],
  15                 guile_cv_struct_utimbuf_needs_posix=no,
  16                 guile_cv_struct_utimbuf_needs_posix=yes)])
  17   if test "$guile_cv_struct_utimbuf_needs_posix" = yes; then
  18      AC_DEFINE(UTIMBUF_NEEDS_POSIX)
  19   fi])
  20
  21
  22
  23
  24 dnl
  25 dnl Apparently, at CMU they have a weird version of libc.h that is
  26 dnl installed in /usr/local/include and conflicts with unistd.h.
  27 dnl In these situations, we should not #include libc.h.
  28 dnl This test arranges to #define LIBC_H_WITH_UNISTD_H iff libc.h is
  29 dnl present on the system, and is safe to #include.
  30 dnl
  31 AC_DEFUN([GUILE_HEADER_LIBC_WITH_UNISTD],
  32   [
  33     AC_CHECK_HEADERS(libc.h unistd.h)
  34     AC_CACHE_CHECK(
  35       "whether libc.h and unistd.h can be included together",
  36       guile_cv_header_libc_with_unistd,
  37       [
  38         if test "$ac_cv_header_libc_h" = "no"; then
  39           guile_cv_header_libc_with_unistd="no"
  40         elif test "$ac_cv_header_unistd.h" = "no"; then
  41           guile_cv_header_libc_with_unistd="yes"
  42         else
  43           AC_TRY_COMPILE(
  44             [
  45 #             include <libc.h>
  46 #             include <unistd.h>
  47             ],
  48             [],
  49             [guile_cv_header_libc_with_unistd=yes],
  50             [guile_cv_header_libc_with_unistd=no]
  51           )
  52         fi
  53       ]
  54     )
  55     if test "$guile_cv_header_libc_with_unistd" = yes; then
  56       AC_DEFINE(LIBC_H_WITH_UNISTD_H)
  57     fi
  58   ]
  59 )
  60
  61
  62
  63 dnl This is needed when we want to check for the same function repeatedly
  64 dnl with other parameters, such as libraries, varying.
  65 dnl
  66 dnl GUILE_NAMED_CHECK_FUNC(FUNCTION, TESTNAME,
  67 dnl                        [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
  68 AC_DEFUN(GUILE_NAMED_CHECK_FUNC,
  69 [AC_MSG_CHECKING([for $1])
  70 AC_CACHE_VAL(ac_cv_func_$1_$2,
  71 [AC_TRY_LINK(
  72 dnl Don't include <ctype.h> because on OSF/1 3.0 it includes <sys/types.h>
  73 dnl which includes <sys/select.h> which contains a prototype for
  74 dnl select.  Similarly for bzero.
  75 [/* System header to define __stub macros and hopefully few prototypes,
  76     which can conflict with char $1(); below.  */
  77 #include <assert.h>
  78 /* Override any gcc2 internal prototype to avoid an error.  */
  79 ]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
  80 extern "C"
  81 #endif
  82 ])dnl
  83 [/* We use char because int might match the return type of a gcc2
  84     builtin and then its argument prototype would still apply.  */
  85 char $1();
  86 ], [
  87 /* The GNU C library defines this for functions which it implements
  88     to always fail with ENOSYS.  Some functions are actually named
  89     something starting with __ and the normal name is an alias.  */
  90 #if defined (__stub_$1) || defined (__stub___$1)
  91 choke me
  92 #else
  93 $1();
  94 #endif
  95 ], eval "ac_cv_func_$1_$2=yes", eval "ac_cv_func_$1_$2=no")])
  96 if eval "test \"`echo '$ac_cv_func_'$1'_'$2`\" = yes"; then
  97   AC_MSG_RESULT(yes)
  98   ifelse([$3], , :, [$3])
  99 else
 100   AC_MSG_RESULT(no)
 101 ifelse([$4], , , [$4
 102 ])dnl
 103 fi
 104 ])
 105
 106
 107
 108 dnl Check checks whether dlsym (if present) requires a leading underscore.
 109 dnl Written by Dan Hagerty <hag@ai.mit.edu> for scsh-0.5.0.
 110 AC_DEFUN(GUILE_DLSYM_USCORE, [
 111   AC_MSG_CHECKING(for underscore before symbols)
 112   AC_CACHE_VAL(guile_cv_uscore,[
 113     echo "main(){int i=1;}
 114     fnord(){int i=23; int ltuae=42;}" > conftest.c
 115     ${CC} conftest.c > /dev/null
 116     if (nm a.out | grep _fnord) > /dev/null; then
 117       guile_cv_uscore=yes
 118     else
 119       guile_cv_uscore=no
 120     fi])
 121   AC_MSG_RESULT($guile_cv_uscore)
 122   rm -f conftest.c a.out
 123
 124   if test $guile_cv_uscore = yes; then
 125     AC_DEFINE(USCORE)
 126
 127     if test $ac_cv_func_dlopen = yes -o $ac_cv_lib_dl_dlopen = yes ; then
 128         AC_MSG_CHECKING(whether dlsym always adds an underscore for us)
 129         AC_CACHE_VAL(guile_cv_dlsym_adds_uscore,AC_TRY_RUN( [
 130 #include <dlfcn.h>
 131 #include <stdio.h>
 132 fnord() { int i=42;}
 133 main() { void *self, *ptr1, *ptr2; self=dlopen(NULL,RTLD_LAZY);
 134     if(self) { ptr1=dlsym(self,"fnord"); ptr2=dlsym(self,"_fnord");
 135     if(ptr1 && !ptr2) exit(0); } exit(1); }
 136 ], [guile_cv_dlsym_adds_uscore=yes
 137         AC_DEFINE(DLSYM_ADDS_USCORE) ], guile_cv_dlsym_adds_uscore=no,
 138         guile_cv_dlsym_adds_uscore=no))
 139
 140         AC_MSG_RESULT($guile_cv_dlsym_adds_uscore)
 141     fi
 142   fi
 143 ])