summaryrefslogtreecommitdiff
path: root/gnulib-m4/minmax.m4
diff options
context:
space:
mode:
Diffstat (limited to 'gnulib-m4/minmax.m4')
-rw-r--r--gnulib-m4/minmax.m441
1 files changed, 41 insertions, 0 deletions
diff --git a/gnulib-m4/minmax.m4 b/gnulib-m4/minmax.m4
new file mode 100644
index 0000000..d2993fb
--- /dev/null
+++ b/gnulib-m4/minmax.m4
@@ -0,0 +1,41 @@
+# minmax.m4 serial 3
+dnl Copyright (C) 2005, 2009 Free Software Foundation, Inc.
+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.
+
+AC_PREREQ([2.52])
+
+AC_DEFUN([gl_MINMAX],
+[
+ AC_REQUIRE([gl_PREREQ_MINMAX])
+])
+
+# Prerequisites of lib/minmax.h.
+AC_DEFUN([gl_PREREQ_MINMAX],
+[
+ gl_MINMAX_IN_HEADER([limits.h])
+ gl_MINMAX_IN_HEADER([sys/param.h])
+])
+
+dnl gl_MINMAX_IN_HEADER(HEADER)
+dnl The parameter has to be a literal header name; it cannot be macro,
+dnl nor a shell variable. (Because autoheader collects only AC_DEFINE
+dnl invocations with a literal macro name.)
+AC_DEFUN([gl_MINMAX_IN_HEADER],
+[
+ m4_pushdef([header], AS_TR_SH([$1]))
+ m4_pushdef([HEADER], AS_TR_CPP([$1]))
+ AC_CACHE_CHECK([whether <$1> defines MIN and MAX],
+ [gl_cv_minmax_in_]header,
+ [AC_TRY_COMPILE([#include <$1>
+int x = MIN (42, 17);], [],
+ [gl_cv_minmax_in_]header[=yes],
+ [gl_cv_minmax_in_]header[=no])])
+ if test $gl_cv_minmax_in_[]header = yes; then
+ AC_DEFINE([HAVE_MINMAX_IN_]HEADER, 1,
+ [Define to 1 if <$1> defines the MIN and MAX macros.])
+ fi
+ m4_popdef([HEADER])
+ m4_popdef([header])
+])