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Subject[PATCH 4/8] kgdb: COPTIMIZE flag
Date
From: Jason Wessel <jason.wessel@windriver.com>

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@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
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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