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-rw-r--r--src/vppapigen.am9
1 files changed, 6 insertions, 3 deletions
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