X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvppapigen.am;h=3207c83a3250b8b7c595be819cd8b9e9a08b8a83;hb=d2c97d988b2fbc28f0905d1826b428967d09348a;hp=edde339d451120bc5683a521a0d14d5196f199b1;hpb=cb034b9b374927c7552e36dcbc306d8456b2a0cb;p=vpp.git

diff --git a/src/vppapigen.am b/src/vppapigen.am
index edde339d451..3207c83a325 100644
--- a/src/vppapigen.am
+++ b/src/vppapigen.am
@@ -13,14 +13,17 @@
 
 bin_PROGRAMS += vppapigen
 
-BUILT_SOURCES += tools/vppapigen/gram.h
+# We cannot rely on BUILT_SOURCES here as other built sources are relying
+# on vppapigen, so make can start compiling lex.c before gram.h is created.
+# This way we introduce new dependency by running C preprocessor.
 
-tools/vppapigen/gram.h: tools/vppapigen/gram.y
+tools/vppapigen/lex_e.c: tools/vppapigen/lex.c tools/vppapigen/gram.y
 	@$(YACC) -d @srcdir@/tools/vppapigen/gram.y
 	@mv y.tab.h tools/vppapigen/gram.h
 	@rm y.tab.c
+	@$(CC) -I. -E -o $@ $<
 
-vppapigen_SOURCES = tools/vppapigen/gram.y tools/vppapigen/lex.c tools/vppapigen/node.c
+vppapigen_SOURCES = tools/vppapigen/gram.y tools/vppapigen/lex_e.c tools/vppapigen/node.c
 vppapigen_LDADD = libvppinfra.la
 vppapigen_LDFLAGS = -static