X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=acinclude.m4;h=42ae613bfb88b4fe6d390fd0dcd05e93b764d5cb;hb=3e1b09cda059699f71650a4dcc80c847f379499a;hp=e45a9be468f66c4d1af7d2f748929b77c3898d0c;hpb=cf4da7ffcb1c9f1016c4fa013deb8ce40c431e19;p=pspp-builds.git

diff --git a/acinclude.m4 b/acinclude.m4
index e45a9be4..42ae613b 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -3,40 +3,21 @@ dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-dnl Check longest integer in digits.
-
-AC_DEFUN([BLP_INT_DIGITS],
+dnl Check whether a warning flag is accepted.
+dnl If so, add it to CFLAGS.
+dnl Example: PSPP_ENABLE_WARNING(-Wdeclaration-after-statement)
+AC_DEFUN([PSPP_ENABLE_WARNING],
 [
-AC_MSG_CHECKING(number of digits in LONG_MIN (incl. sign))
-AC_CACHE_VAL(blp_int_digits,
-	     [AC_TRY_RUN([#include <stdio.h>
-                          #include <limits.h>
-			  int
-			  main()
-			  {
-			    int len;
-			    char s[80];
-			    sprintf(s, "%ld", LONG_MAX);
-			    len = strlen(s);
-			    sprintf(s, "%ld", LONG_MIN);
-			    if(strlen(s)>len) len=strlen(s);
-			    sprintf(s, "%lu", ULONG_MAX);
-			    if(strlen(s)>len) len=strlen(s);
-			    exit(len);
-			  }
-			 ],
-			 eval "blp_int_digits=19",
-			 eval "blp_int_digits=$?"
-			 if test "$blp_int_digits" -lt 11; then
-			   blp_int_digits=11
-			 fi,
-			 eval "blp_int_digits=19")
-	     ])
-AC_DEFINE_UNQUOTED([INT_DIGITS], $blp_int_digits,
-	[Number of digits in longest `long' value, including sign.
-         This is usually 11, for 32-bit `long's, or 19, for 64-bit
-         `long's.])
-AC_MSG_RESULT($blp_int_digits) ])dnl
+  m4_define([pspp_cv_name], [pspp_cv_[]m4_translit([$1], [-], [_])])dnl
+  AC_CACHE_CHECK([whether $CC accepts $1], [pspp_cv_name], 
+    [pspp_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $1"
+     AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [pspp_cv_name[]=yes], [pspp_cv_name[]=no])
+     CFLAGS="$pspp_save_CFLAGS"])
+  if test $pspp_cv_name = yes; then
+    CFLAGS="$CFLAGS $1"
+  fi
+])
 
 dnl Check for readline and history libraries.