[PATCH 3/6] Make it possible to enable/disable parsers generation at ./configure

[Diego 'Flameeyes' Pettenò]

Instead of having to edit the configure.in file to disable parsers,
make it possible to disable it at ./configure stage, like any good
autoconf project should do.
---

 configure.in       |   12 +++++++-----
 ragel/Makefile.in  |    6 +++---
 redfsm/Makefile.in |    2 +-
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/configure.in b/configure.in
index cc25f2e..3995551 100644
--- a/configure.in
+++ b/configure.in
@@ -21,10 +21,12 @@ dnl   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 AC_INIT(ragel/main.cpp)
 AC_CONFIG_HEADER(common/config.h)
 
-dnl Set to true if build system should generate parsers from ragel, kelbt, and
-dnl gperf sources. Set to false if generated files are included and not to be
-dnl built (production).
-AC_SUBST(BUILD_PARSERS,true)
+dnl You need to enable this unless the generated files are included
+dnl and don't need to be built.
+AC_ARG_ENABLE([parsers],
+  AS_HELP_STRING([--disable-parsers], [Disable building of parsers with ragel, kelbt and gperf]),
+  [], [enable_parsers=yes])
+AC_SUBST([enable_parsers])
 
 dnl Checks for programs.
 AC_PROG_CC
@@ -38,7 +40,7 @@ AC_LANG_CPLUSPLUS
 dnl Check for definition of MAKE.
 AC_PROG_MAKE_SET
 
-if test $BUILD_PARSERS = true; then
+if test $enable_parsers = yes; then
 
 dnl Check for Ragel
 AC_CHECK_PROG(RAGEL, ragel, ragel)
diff --git a/ragel/Makefile.in b/ragel/Makefile.in
index b6397dc..2a6b5da 100644
--- a/ragel/Makefile.in
+++ b/ragel/Makefile.in
@@ -45,7 +45,7 @@ MINGW_LIBS = -lpsapi
 #*************************************
 
 prefix = @prefix@
-BUILD_PARSERS = @BUILD_PARSERS@
+BUILD_PARSERS = @enable_parsers@
 EXEEXT = @EXEEXT@
 CXX = @CXX@
 
@@ -63,7 +63,7 @@ all: ragel$(EXEEXT)
 ragel$(EXEEXT): $(GEN_SRC) $(OBJS) $(RAGEL_LIBS)
 	$(CXX) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)
 
-ifeq ($(BUILD_PARSERS),true)
+ifeq ($(BUILD_PARSERS),yes)
 
 rlparse.h: rlparse.kh
 	kelbt -o $@ $<
@@ -87,7 +87,7 @@ endif
 distclean: clean
 	rm -f Makefile 
 
-ifeq ($(BUILD_PARSERS),true)
+ifeq ($(BUILD_PARSERS),yes)
 EXTRA_CLEAN = $(GEN_SRC)
 endif
 
diff --git a/redfsm/Makefile.in b/redfsm/Makefile.in
index a4c6737..951de79 100644
--- a/redfsm/Makefile.in
+++ b/redfsm/Makefile.in
@@ -28,7 +28,7 @@ CC_SRCS = redfsm.cpp gendata.cpp xmltags.cpp xmlscan.cpp xmlparse.cpp
 
 GEN_SRC = xmltags.cpp xmlscan.cpp xmlparse.cpp xmlparse.h
 
-BUILD_PARSERS = @BUILD_PARSERS@
+BUILD_PARSERS = @enable_parsers@
 
 #*************************************