From cde9a0caea641ac95f4790a00ad826a9a87b2caf Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Mon, 31 Mar 2014 15:38:05 +0100
Subject: [PATCH] Build: Do not swallow Mako template errors in
 src/components/style/properties.rs.mako

---
 Makefile.in                     | 4 +++-
 src/components/style/.gitignore | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Makefile.in b/Makefile.in
index 4758e39349f..9cce690bfa1 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -309,7 +309,9 @@ $(AUTOGEN_SRC_script): $(BINDINGS_SRC)/%Binding.rs: $(bindinggen_dependencies) \
 globalgen_dependencies := $(addprefix $(BINDINGS_SRC)/, GlobalGen.py Bindings.conf Configuration.py CodegenRust.py parser/WebIDL.py) $(CACHE_DIR)/.done
 
 $(MAKO_style): $(MAKO_SRC_style)
-	PYTHONPATH=$(MAKO_ZIP) python -c "from mako.template import Template; print(Template(filename='$<').render())" > $@
+# Use a temporary file to avoid writing an empty (but more recent) file on failure.
+	PYTHONPATH=$(MAKO_ZIP) python -c "from mako.template import Template; print(Template(filename='$<').render())" > $@.tmp
+	mv $@.tmp $@
 
 
 $(CACHE_DIR)/.done:
diff --git a/src/components/style/.gitignore b/src/components/style/.gitignore
index babbbcce4e3..79d1b1f5fe2 100644
--- a/src/components/style/.gitignore
+++ b/src/components/style/.gitignore
@@ -1 +1,2 @@
 properties.rs
+properties.rs.tmp