Makefile is much improved ("make deps" works again, etc).

1 files changed, 17 insertions, 0 deletions

diff --git a/gen-deps.sh b/gen-deps.sh
new file mode 100755
index 0000000..6f7b4af
--- /dev/null
+++ b/gen-deps.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+# This script wraps gcc -MM, which unhelpfully strips the directory
+# off of the input filename.  In other words, if you run:
+#
+# $ gcc -MM src/upb_parse.c
+#
+# ...the emitted dependency information looks like:
+#
+# upb_parse.o: src/upb_parse.h [...]
+#
+# Since upb_parse.o is actually in src, the dependency information is
+# not used.  To remedy this, we use the -MT flag (see gcc docs).
+
+rm -f deps
+for file in $@; do
+  gcc -MM $file -MT ${file%.*}.o -Idescriptor -Isrc -I. >> deps
+done