Patch for Review: Add regex functions checks to fastjar/configure.in

[Ranjit Mathew]

Hi,

     The following is my attempt to address the fact that the
regex functions like regexec, regcomp, etc. might not be defined
in libc (as on Linux) and might need a separate library like
libregex (as on MinGW).

Unfortunately, the current fastjar configuration assumes otherwise.

I really wanted to define a straightforward:

AC_CHECK_FUNC( regexec, ,
    AC_CHECK_LIB( regex, regexec, ,
       AC_MSG_ERROR([regex functions not found - get libregex])))

but autoconf does not accept this due to recursive definition
errors from m4.

This patch relies on the fact that the default success action of
AC_CHECK_LIB for a library "foo" is to prefix "-lfoo" to the shell
variable "LIBS".

Finally, "configure" needs to be regenerated after this patch.

ChangeLog:

2003-01-18  Ranjit Mathew  <rmathew@hotmail.com>

	* configure.in: Check if libc really has regex functions,
         otherwise try libregex.
         * configure: Rebuilt.

Patch:
------------------------------- 8< -------------------------------
--- configure.in	2003-01-18 20:27:39.000000000 +0530
+++ configure.in	2003-01-18 21:53:31.000000000 +0530
@@ -34,4 +34,13 @@
  gcc_AC_FUNC_MKDIR_TAKES_ONE_ARG

+dnl Check for regex functions
+regex_impl=unknown
+AC_CHECK_FUNC( regexec, regex_impl=libc)
+
+if test "$regex_impl" = unknown; then
+   AC_CHECK_LIB( regex, regexec, ,
+      AC_MSG_ERROR([regex functions not found - get libregex]))
+fi
+
  dnl Check for type-widths
  gcc_AC_COMPILE_CHECK_SIZEOF(char)
------------------------------- 8< -------------------------------

Sincerely Yours,
Ranjit.

-- 
Ranjit Mathew        Email: rmathew AT hotmail DOT com
Bangalore,
INDIA.               Web: http://ranjitmathew.tripod.com/