[PATCH] ARM: Don't mention the full path of the source directory in mach-types.h

[Uwe Kleine-König]

To make package building reproducible independent of the location of the
source tree, the absolute path of this source tree must not be mentioned
in the built artifact. So strip $abs_srctree from FILENAME in the
output.

This fixes a warning issued by Yocto:
	WARNING: linux-lxatac-6.7-r0 do_package_qa: QA Issue: File /usr/src/debug/linux-lxatac/6.7-r0/arch/arm/include/generated/asm/mach-types.h in package linux-lxatac-src contains reference to TMPDIR

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 arch/arm/tools/gen-mach-types | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm/tools/gen-mach-types b/arch/arm/tools/gen-mach-types
index cbe1c33bb871..9592ceb8a102 100644
--- a/arch/arm/tools/gen-mach-types
+++ b/arch/arm/tools/gen-mach-types
@@ -21,10 +21,21 @@ NF == 3 {
 	  num[nr] = ""; nr++
 	}
 
+# prepend a \ to all special chars in a regexp
+function quote(s) {
+	return gensub("[][\\^$.|()*+?{}]", "\\\\&", "g", s)
+}
+
+# Strip the absolute path of the source tree from the parameter
+# to make the result independent of where the source is located.
+function relsrcfile(fn) {
+	sub("^" quote(ENVIRON["abs_srctree"]) "/", "", fn)
+	return fn
+}
 
 END	{
 	  printf("/*\n");
-	  printf(" * This was automagically generated from %s!\n", FILENAME);
+	  printf(" * This was automagically generated from %s!\n", relsrcfile(FILENAME));
 	  printf(" * Do NOT edit\n");
 	  printf(" */\n\n");
 	  printf("#ifndef __ASM_ARM_MACH_TYPE_H\n");
-- 
2.43.0