(file_type): New file/function. Extracted from diffutils.

[gnulib.git] / m4 / xstrtoumax.m4

diff --git a/m4/xstrtoumax.m4 b/m4/xstrtoumax.m4
index ee87c9a..9ab71ec 100644 (file)
--- a/m4/xstrtoumax.m4
+++ b/m4/xstrtoumax.m4
@@ -1,10 +1,40 @@
-#serial 1
+#serial 4
 
 # autoconf tests required for use of xstrtoumax.c
 
-AC_DEFUN(jm_AC_PREREQ_XSTRTOUMAX,
+AC_DEFUN([jm_AC_PREREQ_XSTRTOUMAX],
 [
-  jm_AC_HEADER_INTTYPES_H
-  AC_CHECK_HEADERS(stdlib.h)
-  AC_CHECK_FUNCS(strtoull strtoumax strtouq)
+  AC_REQUIRE([jm_AC_TYPE_INTMAX_T])
+  AC_REQUIRE([jm_AC_TYPE_UINTMAX_T])
+  AC_REQUIRE([jm_AC_TYPE_LONG_LONG])
+  AC_REQUIRE([jm_AC_TYPE_UNSIGNED_LONG_LONG])
+  AC_CHECK_DECLS([strtol, strtoul, strtoull, strtoimax, strtoumax])
+  AC_CHECK_HEADERS(limits.h stdlib.h inttypes.h)
+
+  AC_CACHE_CHECK([whether <inttypes.h> defines strtoumax as a macro],
+    jm_cv_func_strtoumax_macro,
+    AC_EGREP_CPP([inttypes_h_defines_strtoumax], [#include <inttypes.h>
+#ifdef strtoumax
+ inttypes_h_defines_strtoumax
+#endif],
+      jm_cv_func_strtoumax_macro=yes,
+      jm_cv_func_strtoumax_macro=no))
+
+  if test "$jm_cv_func_strtoumax_macro" != yes; then
+    AC_REPLACE_FUNCS(strtoumax)
+  fi
+
+  dnl Only the replacement strtoumax invokes strtoul and strtoull,
+  dnl so we need the replacements only if strtoumax does not exist.
+  case "$jm_cv_func_strtoumax_macro,$ac_cv_func_strtoumax" in
+    no,no)
+      AC_REPLACE_FUNCS(strtoul)
+
+      dnl We don't need (and can't compile) the replacement strtoull
+      dnl unless the type `unsigned long long' exists.
+      if test "$ac_cv_type_unsigned_long_long" = yes; then
+       AC_REPLACE_FUNCS(strtoull)
+      fi
+      ;;
+  esac
 ])