Fix: standardize parser/lexer building

[lttng-tools.git] / src / lib / lttng-ctl / filter / Makefile.am

diff --git a/src/lib/lttng-ctl/filter/Makefile.am b/src/lib/lttng-ctl/filter/Makefile.am
index eb913e924f05f352a0fc7dca5075e8fa47b1c8c9..13a9e195a5f24b11bc85a2862221c76fd9106d07 100644 (file)
--- a/src/lib/lttng-ctl/filter/Makefile.am
+++ b/src/lib/lttng-ctl/filter/Makefile.am
@@ -7,9 +7,9 @@ noinst_HEADERS = filter-ast.h \
                filter-symbols.h
 
 BUILT_SOURCES = filter-parser.h
-AM_YFLAGS = -t -d -v
 
-libfilter_la_SOURCES = filter-lexer.l filter-parser.y \
+libfilter_la_SOURCES = \
+       filter-parser.y filter-lexer.l \
        filter-visitor-set-parent.c \
        filter-visitor-xml.c \
        filter-visitor-generate-ir.c \
@@ -22,7 +22,42 @@ libfilter_la_SOURCES = filter-lexer.l filter-parser.y \
        memstream.h
 libfilter_la_CFLAGS = -include filter-symbols.h
 
+AM_YFLAGS = -t -d -v
+
+# start with empty files to clean
+CLEANFILES =
+
+if HAVE_BISON
+# we have bison: we can clean the generated parser files
+CLEANFILES += filter-parser.c filter-parser.h filter-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."
+
+filter-parser.c filter-parser.h: filter-parser.y
+       @echo $(ERR_MSG)
+       @false
+
+all-local: filter-parser.c filter-parser.h
+endif # HAVE_BISON
+
+if HAVE_FLEX
+# we have flex: we can clean the generated lexer files
+CLEANFILES += filter-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: filter-lexer.l
+       @echo $(ERR_MSG)
+       @false
+
+all-local: filter-lexer.c
+endif # HAVE_FLEX
+
 filter_grammar_test_SOURCES = filter-grammar-test.c
 filter_grammar_test_LDADD = libfilter.la
-
-CLEANFILES = filter-lexer.c filter-parser.c filter-parser.h filter-parser.output