Kbuild: Add option to set -femit-struct-debug-baseonly

Commit Message

Andi Kleen July 14, 2010, 1:43 p.m. UTC

None

Patch

Index: linux-2.6.34-ak/Makefile
===================================================================
--- linux-2.6.34-ak.orig/Makefile
+++ linux-2.6.34-ak/Makefile
@@ -554,6 +554,10 @@  KBUILD_CFLAGS	+= -g
 KBUILD_AFLAGS	+= -gdwarf-2
 endif
 
+ifdef CONFIG_DEBUG_INFO_REDUCED
+KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly)
+endif
+
 ifdef CONFIG_FUNCTION_TRACER
 KBUILD_CFLAGS	+= -pg
 endif
Index: linux-2.6.34-ak/lib/Kconfig.debug
===================================================================
--- linux-2.6.34-ak.orig/lib/Kconfig.debug
+++ linux-2.6.34-ak/lib/Kconfig.debug
@@ -616,6 +616,18 @@  config DEBUG_INFO
 
 	  If unsure, say N.
 
+config DEBUG_INFO_REDUCED
+	bool "Reduce debugging information"
+	depends on DEBUG_INFO
+	help
+	  If you say Y here gcc is instructed to generate less debugging information
+          for structure types. This means that tools that need full debugging information
+          (like kgdb or systemtap) won't be happy. But if you merely need debugging
+          information to resolve line numbers there is no loss.
+          Advantage is that build directory object sizes shrink dramatically over
+          a full DEBUG_INFO build and compile times are reduced too.
+          Only works with newer gcc versions.
+
 config DEBUG_VM
 	bool "Debug VM"
 	depends on DEBUG_KERNEL