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As the comparison uses process substitution to pass files after
conversion to DTS format, the diff header doesn't show the real
filenames, but the names of the file descriptors used:

--- /dev/fd/63 2017-06-22 11:21:47.531637188 +0200
+++ /dev/fd/62 2017-06-22 11:21:47.531637188 +0200

This is especially annoying when comparing a bunch of DT files in a
loop, as the output doesn't show a clue about which files it refers to.

Fix this by explicitly passing the original file names to the diff
command using the --label option, giving e.g.:

--- arch/arm/boot/dts/r8a7791-koelsch.dtb
+++ arch/arm/boot/dts/r8a7791-porter.dtb

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
scripts/dtc/dtx_diff | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/dtc/dtx_diff b/scripts/dtc/dtx_diff
index ec47f95991a3aecc..fb86f3899e162200 100755
--- a/scripts/dtc/dtx_diff
+++ b/scripts/dtc/dtx_diff
@@ -338,7 +338,7 @@ DTC="${DTC} ${dtc_flags} -O dts -qq -f ${dtc_sort} -o -"

if (( ${cmd_diff} )) ; then

- diff ${diff_flags} \
+ diff ${diff_flags} --label "${dtx_file_1}" --label "${dtx_file_2}" \
<(compile_to_dts "${dtx_file_1}") \
<(compile_to_dts "${dtx_file_2}")

--
2.7.4
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