Exit with an error if re2c is not available

Instead of overwriting src/json.hpp with an empty file
2017-03-20 13:07:01 +09:00 · 2017-03-20 13:07:01 +09:00 · b9c3b8d688
parent 86579209c8
commit b9c3b8d688
1 changed files with 4 additions and 1 deletions
--- a/5
+++ b/5
@ -1,7 +1,7 @@
 .PHONY: pretty clean ChangeLog.md

 # used programs
-RE2C = re2c
+RE2C := $(shell command -v re2c 2> /dev/null)
 SED = sed

 # main target
@ -185,6 +185,9 @@ clang_sanitize: clean

 # create scanner with re2c
 re2c: src/json.hpp.re2c
+ifndef RE2C
+	$(error "re2c is not available, please install re2c")
+endif
 	$(RE2C) -W --utf-8 --encoding-policy fail --bit-vectors --nested-ifs --no-debug-info $< | $(SED) '1d' > src/json.hpp

 # pretty printer