Cleanup: bison and flex detection

[babeltrace.git] / plugins / ctf / common / metadata / Makefile.am

diff --git a/plugins/ctf/common/metadata/Makefile.am b/plugins/ctf/common/metadata/Makefile.am
index 925b31a9493153d3f63dbf341cb8c0fbebbab19c..b6cf623824509cd88aabbded247f1baefc7e3e1f 100644 (file)
--- a/plugins/ctf/common/metadata/Makefile.am
+++ b/plugins/ctf/common/metadata/Makefile.am
@@ -1,11 +1,12 @@
 AM_CPPFLAGS += -I$(builddir) -I$(srcdir)
-BUILT_SOURCES = parser.h parser.c lexer.c
 AM_YFLAGS = -t -d -v
 
 noinst_LTLIBRARIES = libctf-parser.la libctf-ast.la
 
+BUILT_SOURCES = parser.h
+
 libctf_parser_la_SOURCES = lexer.l parser.y objstack.c
-# ctf-scanner-symbols.h is included to prefix generated yy_* symbols
+# scanner-symbols.h is included to prefix generated yy_* symbols
 # with bt_.
 libctf_parser_la_CPPFLAGS = $(AM_CPPFLAGS) \
                -include $(srcdir)/scanner-symbols.h
@@ -31,4 +32,37 @@ if BABELTRACE_BUILD_WITH_MINGW
 libctf_ast_la_LIBADD += -lrpcrt4 -lintl -liconv -lole32 $(POPT_LIBS)
 endif
 
-CLEANFILES = $(BUILT_SOURCES) parser.output
+# start with empty files to clean
+CLEANFILES =
+
+if HAVE_BISON
+# we have bison: we can clean the generated parser files
+CLEANFILES += parser.c parser.h parser.output
+else # HAVE_BISON
+# create target used to stop the build if we want to build the parser,
+# but we don't have the necessary tool to do so
+ERR_MSG = "Error: Cannot build target because bison is missing."
+ERR_MSG += "Make sure bison is installed and run the configure script again."
+
+parser.c parser.h: parser.y
+       @echo $(ERR_MSG)
+       @false
+
+all-local: parser.c parser.h
+endif # HAVE_BISON
+
+if HAVE_FLEX
+# we have flex: we can clean the generated lexer files
+CLEANFILES += lexer.c
+else # HAVE_FLEX
+# create target used to stop the build if we want to build the lexer,
+# but we don't have the necessary tool to do so
+ERR_MSG = "Error: Cannot build target because flex is missing."
+ERR_MSG += "Make sure flex is installed and run the configure script again."
+
+filter-lexer.c: lexer.l
+        @echo $(ERR_MSG)
+        @false
+
+all-local: lexer.c
+endif # HAVE_FLEX