Put bison/flex files in parsers dir, so scan-build --exclude can be used

The autogenerated files create warnings that we can't do much about, so
exclude them.

src/.gitignore

@@ -1,8 +1,5 @@
 owntone
 
-*_lexer.[ch]
-*_parser.[ch]
-
 daap_query_hash.h
 rsp_query_hash.h
 dacp_prop_hash.h

src/Makefile.am

@@ -62,14 +62,8 @@ GPERF_FILES = \
 
 GPERF_SRC = $(GPERF_FILES:.gperf=_hash.h)
 
-LEXER_SRC  = daap_lexer.l smartpl_lexer.l
-PARSER_SRC = daap_parser.y smartpl_parser.y
-
-# This flag is given to flex and tells it to produce headers. automake's ylwrap
-# doesn't seem to rename the header like it does with the .c flex output, so
-# here we give it the final name. The "$(@:.c=.h)" uses substitution reference
-# and means 'change .c to .h in $@' (the target name, e.g. calc_lexer.c).
-AM_LFLAGS = --header-file=$(@:.c=.h)
+LEXER_SRC  = parsers/daap_lexer.l parsers/smartpl_lexer.l
+PARSER_SRC = parsers/daap_parser.y parsers/smartpl_parser.y
 
 # This flag is given to Bison and tells it to produce headers. Note that
 # automake recognizes this flag too, and has special logic around it, so don't
@@ -153,7 +147,7 @@ owntone_SOURCES = main.c \
 # the C files as target, as the AM_LFLAGS will make sure headers are produced.
 BUILT_SOURCES = \
 	$(GPERF_SRC) \
-	$(LEXER_SRC:.l=.c) $(PARSER_SRC:.y=.h)
+	$(LEXER_SRC:.l=.h) $(PARSER_SRC:.y=.h)
 
 # automake doesn't know how to make lexer headers, nor does it automatically
 # include them, so need to specify them as EXTRA_DIST.
@@ -165,6 +159,11 @@ EXTRA_DIST = \
 %_hash.h: %.gperf
 	$(AM_V_GEN)$(GPERF) --output-file=$@ $<
 
+# Rule for generating lexer headers. $@ is an automatic variable that is equal
+# to the particular target name, so a header file name.
+$(LEXER_SRC:.l=.h): $(LEXER_SRC)
+	$(LEX) --header-file=$@ --stdout $(@:.h=.l) > /dev/null
+
 # Anything built by make should be cleaned by make clean, but when it comes to
 # flex/bison automake's support leaves something to be desired
 clean-local:

src/daap_query.c

@@ -26,7 +26,7 @@
 #include <errno.h>
 
 #include "daap_query.h"
-#include "daap_parser.h"
+#include "parsers/daap_parser.h"
 #include "logger.h"
 #include "misc.h"
 

src/parsers/.gitignore

@@ -0,0 +1,2 @@
+*_lexer.[ch]
+*_parser.[ch]

src/smartpl_query.c

@@ -32,7 +32,7 @@
 #include <errno.h>
 
 #include "smartpl_query.h"
-#include "smartpl_parser.h"
+#include "parsers/smartpl_parser.h"
 #include "logger.h"
 #include "misc.h"