Use CAPI for lseek
[packages/base.git] / aclocal.m4
index f19b052..6e9801f 100644 (file)
@@ -7,8 +7,10 @@
 # Implementation note: We are lazy and use an internal autoconf macro, but it
 # is supported in autoconf versions 2.50 up to the actual 2.57, so there is
 # little risk.
+# The public AC_COMPUTE_INT macro isn't supported by some versions of
+# autoconf.
 AC_DEFUN([FP_COMPUTE_INT],
-[_AC_COMPUTE_INT([$1], [$2], [$3], [$4])[]dnl
+[_AC_COMPUTE_INT([$2], [$1], [$3], [$4])[]dnl
 ])# FP_COMPUTE_INT
 
 
@@ -19,7 +21,7 @@ AC_DEFUN([FP_COMPUTE_INT],
 AC_DEFUN([FP_CHECK_CONST],
 [AS_VAR_PUSHDEF([fp_Cache], [fp_cv_const_$1])[]dnl
 AC_CACHE_CHECK([value of $1], fp_Cache,
-[FP_COMPUTE_INT([$1], fp_check_const_result, [AC_INCLUDES_DEFAULT([$2])],
+[FP_COMPUTE_INT(fp_check_const_result, [$1], [AC_INCLUDES_DEFAULT([$2])],
                 [fp_check_const_result=m4_default([$3], ['-1'])])
 AS_VAR_SET(fp_Cache, [$fp_check_const_result])])[]dnl
 AC_DEFINE_UNQUOTED(AS_TR_CPP([CONST_$1]), AS_VAR_GET(fp_Cache), [The value of $1.])[]dnl
@@ -40,7 +42,7 @@ m4_define([FP_CHECK_CONSTS_TEMPLATE],
 # FP_CHECK_CONSTS(EXPRESSION..., [INCLUDES = DEFAULT-INCLUDES], [VALUE-IF-FAIL = -1])
 # -----------------------------------------------------------------------------------
 # List version of FP_CHECK_CONST
-AC_DEFUN(FP_CHECK_CONSTS,
+AC_DEFUN([FP_CHECK_CONSTS],
 [FP_CHECK_CONSTS_TEMPLATE([$1])dnl
 for fp_const_name in $1
 do
@@ -49,24 +51,10 @@ done
 ])# FP_CHECK_CONSTS
 
 
-dnl ** Map an arithmetic C type to a Haskell type.
-dnl    Based on autconf's AC_CHECK_SIZEOF.
-
-dnl FPTOOLS_CHECK_HTYPE(TYPE [, DEFAULT_VALUE, [, VALUE-FOR-CROSS-COMPILATION])
-AC_DEFUN(FPTOOLS_CHECK_HTYPE,
-[changequote(<<, >>)dnl
-dnl The name to #define.
-define(<<AC_TYPE_NAME>>, translit(htype_$1, [a-z *], [A-Z_P]))dnl
-dnl The cache variable name.
-define(<<AC_CV_NAME>>, translit(fptools_cv_htype_$1, [ *], [_p]))dnl
-define(<<AC_CV_NAME_supported>>, translit(fptools_cv_htype_sup_$1, [ *], [_p]))dnl
-changequote([, ])dnl
-AC_MSG_CHECKING(Haskell type for $1)
-AC_CACHE_VAL(AC_CV_NAME,
-[AC_CV_NAME_supported=yes
-fp_check_htype_save_cppflags="$CPPFLAGS"
-CPPFLAGS="$CPPFLAGS $X_CFLAGS"
-AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+dnl FPTOOLS_HTYPE_INCLUDES
+AC_DEFUN([FPTOOLS_HTYPE_INCLUDES],
+[
+#include <stdio.h>
 #include <stddef.h>
 
 #if HAVE_SYS_TYPES_H
@@ -105,108 +93,139 @@ AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
 # include <ctype.h>
 #endif
 
-#if defined(HAVE_GL_GL_H)
-# include <GL/gl.h>
-#elif defined(HAVE_OPENGL_GL_H)
-# include <OpenGL/gl.h>
-#endif
-
-#if defined(HAVE_AL_ALC_H)
-# include <AL/alc.h>
-#elif defined(HAVE_OPENAL_ALC_H)
-# include <OpenAL/alc.h>
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#else
+# if HAVE_STDINT_H
+#  include <stdint.h>
+# endif
 #endif
 
 #if HAVE_SYS_RESOURCE_H
 # include <sys/resource.h>
 #endif
 
-typedef $1 testing;
-
-main() {
-  FILE *f=fopen("conftestval", "w");
-  if (!f) exit(1);
-  if (((testing)((int)((testing)1.4))) == ((testing)1.4)) {
-    fprintf(f, "%s%d\n",
-           ((testing)(-1) < (testing)0) ? "Int" : "Word",
-           sizeof(testing)*8);
-  } else {
-    fprintf(f,"%s\n",
-           (sizeof(testing) >  sizeof(double)) ? "LDouble" :
-           (sizeof(testing) == sizeof(double)) ? "Double"  : "Float");
-  }
-  fclose(f);
-  exit(0);
-}]])],[AC_CV_NAME=`cat conftestval`],
-[ifelse([$2], , [AC_CV_NAME=NotReallyAType; AC_CV_NAME_supported=no], [AC_CV_NAME=$2])],
-[ifelse([$3], , [AC_CV_NAME=NotReallyATypeCross; AC_CV_NAME_supported=no], [AC_CV_NAME=$3])])]) dnl
-CPPFLAGS="$fp_check_htype_save_cppflags"
-if test "$AC_CV_NAME_supported" = yes; then
-  AC_MSG_RESULT($AC_CV_NAME)
-  AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [Define to Haskell type for $1])
-else
-  AC_MSG_RESULT([not supported])
-fi
-undefine([AC_TYPE_NAME])dnl
-undefine([AC_CV_NAME])dnl
-undefine([AC_CV_NAME_supported])dnl
+#include <stdlib.h>
 ])
 
 
-# FP_READDIR_EOF_ERRNO
-# --------------------
-# Defines READDIR_ERRNO_EOF to what readdir() sets 'errno' to upon reaching end
-# of directory (not set => 0); not setting it is the correct thing to do, but
-# MinGW based versions have set it to ENOENT until recently (summer 2004).
-AC_DEFUN([FP_READDIR_EOF_ERRNO],
-[AC_CACHE_CHECK([what readdir sets errno to upon EOF], [fptools_cv_readdir_eof_errno],
-[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <dirent.h>
-#include <stdio.h>
-#include <errno.h>
-int
-main(argc, argv)
-int argc;
-char **argv;
-{
-  FILE *f=fopen("conftestval", "w");
-#if defined(__MINGW32__)
-  int fd = mkdir("testdir");
-#else
-  int fd = mkdir("testdir", 0666);
-#endif
-  DIR* dp;
-  struct dirent* de;
-  int err = 0;
-
-  if (!f) return 1;
-  if (fd == -1) { 
-     fprintf(stderr,"unable to create directory; quitting.\n");
-     return 1;
-  }
-  close(fd);
-  dp = opendir("testdir");
-  if (!dp) { 
-     fprintf(stderr,"unable to browse directory; quitting.\n");
-     rmdir("testdir");
-     return 1;
-  }
-
-  /* the assumption here is that readdir() will only return NULL
-   * due to reaching the end of the directory.
-   */
-  while (de = readdir(dp)) {
-       ;
-  }
-  err = errno;
-  fprintf(f,"%d", err);
-  fclose(f);
-  closedir(dp);
-  rmdir("testdir");
-  return 0;
-}]])],
-[fptools_cv_readdir_eof_errno=`cat conftestval`],
-[AC_MSG_WARN([failed to determine the errno value])
- fptools_cv_readdir_eof_errno=0],
-[fptools_cv_readdir_eof_errno=0])])
-AC_DEFINE_UNQUOTED([READDIR_ERRNO_EOF], [$fptools_cv_readdir_eof_errno], [readdir() sets errno to this upon EOF])
-])# FP_READDIR_EOF_ERRNO
+dnl ** Map an arithmetic C type to a Haskell type.
+dnl    Based on autconf's AC_CHECK_SIZEOF.
+
+dnl FPTOOLS_CHECK_HTYPE_ELSE(TYPE, WHAT_TO_DO_IF_TYPE_DOES_NOT_EXIST)
+AC_DEFUN([FPTOOLS_CHECK_HTYPE_ELSE],[
+    changequote(<<, >>)
+    dnl The name to #define.
+    define(<<AC_TYPE_NAME>>, translit(htype_$1, [a-z *], [A-Z_P]))
+    dnl The cache variable names.
+    define(<<AC_CV_NAME>>, translit(fptools_cv_htype_$1, [ *], [_p]))
+    define(<<AC_CV_NAME_supported>>, translit(fptools_cv_htype_sup_$1, [ *], [_p]))
+    changequote([, ])
+
+    AC_MSG_CHECKING(Haskell type for $1)
+    AC_CACHE_VAL(AC_CV_NAME,[
+        AC_CV_NAME_supported=yes
+        FP_COMPUTE_INT([HTYPE_IS_INTEGRAL],
+                       [(($1)((int)(($1)1.4))) == (($1)1.4)],
+                       [FPTOOLS_HTYPE_INCLUDES],[AC_CV_NAME_supported=no])
+        if test "$AC_CV_NAME_supported" = "yes"
+        then
+            if test "$HTYPE_IS_INTEGRAL" -eq 0
+            then
+                FP_COMPUTE_INT([HTYPE_IS_FLOAT],[sizeof($1) == sizeof(float)],
+                               [FPTOOLS_HTYPE_INCLUDES],
+                               [AC_CV_NAME_supported=no])
+                FP_COMPUTE_INT([HTYPE_IS_DOUBLE],[sizeof($1) == sizeof(double)],
+                               [FPTOOLS_HTYPE_INCLUDES],
+                               [AC_CV_NAME_supported=no])
+                FP_COMPUTE_INT([HTYPE_IS_LDOUBLE],[sizeof($1) == sizeof(long double)],
+                               [FPTOOLS_HTYPE_INCLUDES],
+                               [AC_CV_NAME_supported=no])
+                if test "$HTYPE_IS_FLOAT" -eq 1
+                then
+                    AC_CV_NAME=Float
+                elif test "$HTYPE_IS_DOUBLE" -eq 1
+                then
+                    AC_CV_NAME=Double
+                elif test "$HTYPE_IS_LDOUBLE" -eq 1
+                then
+                    AC_CV_NAME=LDouble
+                else
+                    AC_CV_NAME_supported=no
+                fi
+            else
+                FP_COMPUTE_INT([HTYPE_IS_SIGNED],[(($1)(-1)) < (($1)0)],
+                               [FPTOOLS_HTYPE_INCLUDES],
+                               [AC_CV_NAME_supported=no])
+                FP_COMPUTE_INT([HTYPE_SIZE],[sizeof($1) * 8],
+                               [FPTOOLS_HTYPE_INCLUDES],
+                               [AC_CV_NAME_supported=no])
+                if test "$HTYPE_IS_SIGNED" -eq 0
+                then
+                    AC_CV_NAME="Word$HTYPE_SIZE"
+                else
+                    AC_CV_NAME="Int$HTYPE_SIZE"
+                fi
+            fi
+        fi
+        ])
+    if test "$AC_CV_NAME_supported" = no
+    then
+        $2
+    fi
+
+    dnl Note: evaluating dollar-2 can change the value of
+    dnl $AC_CV_NAME_supported, so we might now get a different answer
+    if test "$AC_CV_NAME_supported" = yes; then
+        AC_MSG_RESULT($AC_CV_NAME)
+        AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME,
+                           [Define to Haskell type for $1])
+    fi
+    undefine([AC_TYPE_NAME])dnl
+    undefine([AC_CV_NAME])dnl
+    undefine([AC_CV_NAME_supported])dnl
+])
+
+dnl FPTOOLS_CHECK_HTYPE(TYPE)
+AC_DEFUN([FPTOOLS_CHECK_HTYPE],[
+    FPTOOLS_CHECK_HTYPE_ELSE([$1],[
+        AC_CV_NAME=NotReallyAType
+        AC_MSG_RESULT([not supported])
+    ])
+])
+
+
+# FP_SEARCH_LIBS_PROTO(WHAT, PROTOTYPE, FUNCTION, SEARCH-LIBS,
+#                [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
+#                [OTHER-LIBRARIES])
+# --------------------------------------------------------
+# Search for a library defining FUNC, if it's not already available.
+# This is a copy of the AC_SEARCH_LIBS definition, but extended to take
+# the name of the thing we are looking for as its first argument, and
+# prototype text as its second argument. It also calls AC_LANG_PROGRAM
+# instead of AC_LANG_CALL
+AC_DEFUN([FP_SEARCH_LIBS_PROTO],
+[AS_VAR_PUSHDEF([ac_Search], [ac_cv_search_$1])dnl
+AC_CACHE_CHECK([for library containing $1], [ac_Search],
+[ac_func_search_save_LIBS=$LIBS
+AC_LANG_CONFTEST([AC_LANG_PROGRAM([$2], [$3])])
+for ac_lib in '' $4; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib $7 $ac_func_search_save_LIBS"
+  fi
+  AC_LINK_IFELSE([], [AS_VAR_SET([ac_Search], [$ac_res])])
+  AS_VAR_SET_IF([ac_Search], [break])
+done
+AS_VAR_SET_IF([ac_Search], , [AS_VAR_SET([ac_Search], [no])])
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS])
+ac_res=AS_VAR_GET([ac_Search])
+AS_IF([test "$ac_res" != no],
+  [test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+  $5],
+      [$6])dnl
+AS_VAR_POPDEF([ac_Search])dnl
+])