Enabling PCRE in autoconf for mqexec.

LICENSE

@@ -1,3 +1,4 @@
+Copyright 2012 Jonathan Reams
 Copyright 2012 The Trustees of Columbia University in the City of New York
 
    Licensed under the Apache License, Version 2.0 (the "License");

configure.ac

@@ -12,6 +12,12 @@ AC_ARG_WITH([zmq-headers],
 	[]
 	[with_zmq_headers=default])
 
+AC_ARG_WITH([pcre-config],
+	[AC_HELP_STRING([--with-pcre-config],
+		[Path to PCRE configuration for mqexec filtering])],
+	[pcre_config_prog=$withval])
+AC_PATH_PROG(PCRE_CONFIG, [pcre-config], $pcre_config_prog)
+
 AC_PROG_CC
 AC_PROG_LIBTOOL
 
@@ -33,6 +39,21 @@ AC_FUNC_REALLOC
 AC_FUNC_STRTOD
 
 m4_include([libev/libev.m4])
+if test "x$PCRE_CONFIG" != "x"; then
+	CFLAGS_SAVE=$CFLAGS
+	LIBS_SAVE=$LIBS
+	CFLAGS="$CFLAGS $($PCRE_CONFIG --cflags)"
+	LIBS="$LIBS $($PCRE_CONFIG --libs)"
+	AC_CHECK_HEADER([pcre.h], [],
+		AC_MSG_FAILURE([PCRE was enabled but headers weren't found]), [])
+	AC_CHECK_LIB([pcre], [pcre_compile], [],
+		AC_MSG_FAILURE([PCRE was enabled but libraries weren't found]), [])
+	CFLAGS=$CFLAGS_SAVE
+	LIBS=$LIBS_SAVE
+	AC_SUBST([PCRE_HEADERS], $($PCRE_CONFIG --cflags))
+	AC_SUBST([PCRE_LIBS], $($PCRE_CONFIG --libs))
+	AC_DEFINE([HAVE_PCRE], [], [PCRE Libraries are installed])
+fi
 
 AC_CONFIG_FILES([Makefile mods/Makefile dnxmq/Makefile])
 AC_CONFIG_SUBDIRS([jansson])

dnxmq/Makefile.am

@@ -1,5 +1,5 @@
 sbin_PROGRAMS = mqexec
 
 mqexec_SOURCES = mqexec.c ../libev/ev.c
-mqexec_LDADD = ../jansson/src/libjansson.la
-mqexec_CFLAGS = -I../jansson/src
+mqexec_LDADD = ../jansson/src/libjansson.la @PCRE_LIBS@
+mqexec_CFLAGS = -I../jansson/src @PCRE_HEADERS@

dnxmq/config.h.in

@@ -0,0 +1,2 @@
+/* Define to 1 if you have the PCRE libraries installed */
+#undef HAVE_PCRE