From 51521153490ab0b01959c10c57e476de3ad27acb Mon Sep 17 00:00:00 2001
From: Akira TAGOH <akira@tagoh.org>
Date: Mon, 2 Dec 2013 18:43:10 +0900
Subject: Simplify to validate the availability of posix_fadvise

---
 m4/ac_check_symbol.m4 | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 m4/ac_check_symbol.m4

(limited to 'm4')

diff --git a/m4/ac_check_symbol.m4 b/m4/ac_check_symbol.m4
new file mode 100644
index 00000000..41c15286
--- /dev/null
+++ b/m4/ac_check_symbol.m4
@@ -0,0 +1,48 @@
+dnl @synopsis AC_CHECK_SYMBOL(SYMBOL, HEADER... [,ACTION-IF-FOUND [,ACTION-IF-NOT-FOUND]])
+dnl
+dnl a wrapper around AC_EGREP_HEADER the shellvar $ac_found will hold
+dnl the HEADER-name that had been containing the symbol. This value is
+dnl shown to the user.
+dnl
+dnl @category C
+dnl @author Guido U. Draheim <guidod@gmx.de>
+dnl @version 2006-10-13
+dnl @license GPLWithACException
+
+AC_DEFUN([AC_CHECK_SYMBOL],
+[AC_MSG_CHECKING([for $1 in $2])
+AC_CACHE_VAL(ac_cv_func_$1,
+[AC_REQUIRE_CPP()dnl
+changequote(, )dnl
+symbol="[^a-zA-Z_0-9]$1[^a-zA-Z_0-9]"
+changequote([, ])dnl
+ac_found=no
+for ac_header in $2 ; do
+  ac_safe=`echo "$ac_header" | sed 'y%./+-%__p_%' `
+  if test $ac_found != "yes" ; then
+      if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
+            AC_EGREP_HEADER( $symbol, $ac_header, [ac_found="$ac_header"] )
+      fi
+  fi
+done
+if test "$ac_found" != "no" ; then
+  AC_MSG_RESULT($ac_found)
+  ifelse([$3], , :, [$3])
+else
+  AC_MSG_RESULT(no)
+  ifelse([$4], , , [$4
+])dnl
+fi
+])])
+
+dnl AC_CHECK_SYMBOLS( symbol..., header... [, action-if-found [, action-if-not-found]])
+AC_DEFUN([AC_CHECK_SYMBOLS],
+[for ac_func in $1
+do
+P4_CHECK_SYMBOL($ac_func, $2,
+[changequote(, )dnl
+  ac_tr_func=HAVE_`echo $ac_func | sed -e 'y:abcdefghijklmnopqrstuvwxyz:ABCDEFGHIJKLMNOPQRSTUVWXYZ:' -e 's:[[^A-Z0-9]]:_:'`
+changequote([, ])dnl
+  AC_DEFINE_UNQUOTED($ac_tr_func) $2], $3)dnl
+done
+])
-- 
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