[PATCH 4/8] kgdb: COPTIMIZE flag

[jason . wessel]

From: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>

This patch adds in the ability to unoptimize a single kernel module to
make source stepping more linear and not optimize out variables that
the developer might like to inspect.  It used with adding
COPTIMIZE=-O0 to the build line when doing something like a single
kernel module only build.  Or you could use it to override the default
optimization level entirely.

Signed-off-by: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 Makefile |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 89f2d8b..65aa7f8 100644
--- a/Makefile
+++ b/Makefile
@@ -502,10 +502,14 @@ endif # $(dot-config)
 all: vmlinux
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS	+= -Os
+COPTIMIZE	+= -Os
 else
-KBUILD_CFLAGS	+= -O2
+COPTIMIZE	+= -O2
 endif
+# COPTIMIZE may be overridden on the make command line with
+# 	make ... COPTIMIZE=""
+# The resulting object may be easier to debug with KGDB
+KBUILD_CFLAGS	+= $(COPTIMIZE)
 
 include $(srctree)/arch/$(SRCARCH)/Makefile
 
-- 
1.5.4

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