[U-Boot] [PATCH v3 016/108] fdt: Show the preprocessed .dts file on error

[Simon Glass]

When device-tree compilation fails it is sometimes tricky to see which
line is broken, since the input file to dtc is a pre-processed version
of the device tree.

Add a line that points to the file that needs to be checked:

Output is something like this:

Error: arch/x86/dts/u-boot.dtsi:137.14-15 syntax error
FATAL ERROR: Unable to parse input tree
Check /tmp/b/chromebook_coral/arch/x86/dts/.chromebook_coral.dtb.pre.tmp
   for errors

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v3:
- Update example error message to better show the intended purpose

Changes in v2: None

 scripts/Makefile.lib | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index ef116e0e0ae..c10cd83a0a3 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -300,7 +300,9 @@ cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $(pre-tmp) ; \
 	$(DTC) -O dtb -o $@ -b 0 \
 		-i $(dir $<) $(DTC_FLAGS) \
-		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
+		-d $(depfile).dtc.tmp $(dtc-tmp) || \
+		(echo "Check $(shell pwd)/$(pre-tmp) for errors" && false) \
+		; \
 	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) ; \
 	sed -i "s:$(pre-tmp):$(<):" $(depfile)
 
-- 
2.23.0.866.gb869b98d4c-goog