build: replace SSTRIP_ARGS with SSTRIP_DISCARD_TRAILING_ZEROES

sstrip only has one functional arg. Make that a bool option, which can
easily depend on other knobs then.

This is required to be disabled for the mold linker.

Signed-off-by: Andre Heider <a.heider@gmail.com>

config/Config-build.in

@@ -182,7 +182,6 @@ menu "Global build settings"
 			help
 			  This will install binaries stripped using strip from binutils.
 
-
 		config USE_SSTRIP
 			bool "sstrip"
 			depends on !USE_GLIBC
@@ -199,13 +198,12 @@ menu "Global build settings"
 		help
 		  Specifies arguments passed to the strip command when stripping binaries.
 
-	config SSTRIP_ARGS
-		string
-		prompt "Sstrip arguments"
+	config SSTRIP_DISCARD_TRAILING_ZEROES
+		bool "Strip trailing zero bytes"
 		depends on USE_SSTRIP
-		default "-z"
+		default y
 		help
-		  Specifies arguments passed to the sstrip command when stripping binaries.
+		  Use sstrip's -z option to discard trailing zero bytes
 
 	config STRIP_KERNEL_EXPORTS
 		bool "Strip unnecessary exports from the kernel image"

rules.mk

@@ -330,7 +330,7 @@ else
     STRIP:=$(TARGET_CROSS)strip $(call qstrip,$(CONFIG_STRIP_ARGS))
   else
     ifneq ($(CONFIG_USE_SSTRIP),)
-      STRIP:=$(STAGING_DIR_HOST)/bin/sstrip $(call qstrip,$(CONFIG_SSTRIP_ARGS))
+      STRIP:=$(STAGING_DIR_HOST)/bin/sstrip $(if $(CONFIG_SSTRIP_DISCARD_TRAILING_ZEROES),-z)
     endif
   endif
   RSTRIP= \