version.h: make generation more robust

* $(ENIGMA2_REV) may be empty, so prefix the line with '-'
* mark target as intermediate and phony to ensure execution and deletion

diff --git a/main/Makefile.am b/main/Makefile.am
index 06e6e920add50d1c6447496ecd452072d4ac0b7b..78fcc6cdc6e664663edf3bcb4c4724a63c62e8f7 100644 (file)
--- a/main/Makefile.am
+++ b/main/Makefile.am
@@ -66,14 +66,14 @@ ENIGMA2_REV = `$(GIT) describe --abbrev=7 --always --dirty --long --tags`
 endif
 
 BUILT_SOURCES = version-intermediate.h
-CLEANFILES = version-intermediate.h
+.INTERMEDIATE: version-intermediate.h
+.PHONY: version-intermediate.h
 version-intermediate.h:
        $(AM_V_GEN)touch $@
        $(AM_V_at)[ -n "$(ENIGMA2_DATE)" ] && echo "#define ENIGMA2_LAST_CHANGE_DATE \"$(ENIGMA2_DATE)\"" >> $@
        $(AM_V_at)[ -n "$(ENIGMA2_BRANCH)" ] && echo "#define ENIGMA2_BRANCH \"$(ENIGMA2_BRANCH)\"" >> $@
-       $(AM_V_at)[ -n "$(ENIGMA2_REV)" ] && echo "#define ENIGMA2_REV \"$(ENIGMA2_REV)\"" >> $@
+       -$(AM_V_at)[ -n "$(ENIGMA2_REV)" ] && echo "#define ENIGMA2_REV \"$(ENIGMA2_REV)\"" >> $@
        $(AM_V_at)([ -f version.h ] && diff -q version.h $@ >/dev/null) || $(INSTALL_HEADER) $@ version.h
-       $(AM_V_at)$(RM) $@
 endif
 
 enigma2$(EXEEXT): $(enigma2_OBJECTS) $(enigma2_DEPENDENCIES) $(enigma2_LDADD_WHOLE)