Build system: deduplicate the rules used to generate the lexers and parsers

1 files changed, 22 insertions, 2 deletions

diff --git a/Makefile.common b/Makefile.common
index af979b789f..1e0486615f 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -66,8 +66,6 @@ OPTCOMPFLAGS=
 ifeq "$(FUNCTION_SECTIONS)" "true"
 OPTCOMPFLAGS += -function-sections
 endif
-# By default, request ocamllex to be quiet
-OCAMLLEXFLAGS ?= -q
 
 # Escape special characters in the argument string.
 # There are four characters that need escaping:
@@ -120,3 +118,25 @@ ifneq ($(EXE),)
 $(1): $(1)$(EXE)
 endif
 endef # PROGRAM_SYNONYM
+
+# Lexer generation
+
+BOOT_OCAMLLEX ?= $(CAMLRUN) $(ROOTDIR)/boot/ocamllex
+# The OCAMLLEX command used in the recipe below is defined in the individual
+# makefiles, because its default value is directory-specific.
+# By default, some directories use BOOT_OCAMLLEX while others use the
+# freshly compiled lexer generator.
+
+OCAMLLEXFLAGS ?= -q
+
+%.ml: %.mll
+	$(OCAMLLEX) $(OCAMLLEXFLAGS) $<
+
+# Parser generation
+
+OCAMLYACC ?= $(ROOTDIR)/yacc/ocamlyacc$(EXE)
+
+OCAMLYACCFLAGS ?=
+
+%.ml %.mli: %.mly
+	$(OCAMLYACC) $(OCAMLYACCFLAGS) $<