automatically rebuild pch

diff --git a/Makefile.am b/Makefile.am
index 68db307..70c445f 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -56,4 +56,7 @@ AM_CPPFLAGS = -Winvalid-pch `test -f common.h.@PCHEXT@ && printf @PCHOPT@ "commo
 common.h.@PCHEXT@: src/common.h
        $(RM) $@; $(CXXCOMPILE) -x c++-header -o $@ $<
 pch: common.h.@PCHEXT@
+pch.mk: common.h.@PCHEXT@
+       : >pch.mk
+-include pch.mk
 endif