[PATCH v1] Kbuild: generate debug info in building
From: Wenji Huang
Date: Wed Nov 12 2008 - 20:43:45 EST
This patch will generate kernel debuginfo in Kbuild when invoking "make
debug_info". The separate debug files are in .debug under building tree.
They can help the cases of requiring debug info for tracing/debug tools,
especially cross-compilation. Moreover, it can simplify or standardize
the packaging process for the distributions those will provide
kernel-debuginfo.
Signed-off-by: Wenji Huang <wenji.huang@xxxxxxxxxx>
---
Makefile | 14 ++++++++++++++
scripts/Makefile.modpost | 14 ++++++++++++++
2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
index 7f9ff9b..eed7510 100644
--- a/Makefile
+++ b/Makefile
@@ -814,6 +814,20 @@ define rule_vmlinux-modpost
$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
endef
+ifdef CONFIG_DEBUG_INFO
+quiet_cmd_vmlinux_debug = GEN $<.debug
+ cmd_vmlinux_debug = mkdir -p .debug; \
+ $(OBJCOPY) --only-keep-debug \
+ $< .debug/$<.debug
+targets += vmlinux.debug
+endif
+
+debug_info: vmlinux FORCE
+ifdef CONFIG_DEBUG_INFO
+ $(call if_changed,vmlinux_debug)
+ $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
+endif
+
# vmlinux image - including updated kernel symbols
vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o
$(kallsyms.o) FORCE
ifdef CONFIG_HEADERS_CHECK
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index f4053dc..0df73b2 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -137,6 +137,20 @@ $(modules): %.ko :%.o %.mod.o FORCE
targets += $(modules)
+modules-debug := $(modules:.ko=.ko.debug)
+ifdef CONFIG_DEBUG_INFO
+quiet_cmd_debug_ko = GEN $@
+ cmd_debug_ko = mkdir -p .debug/`dirname $@`; \
+ $(OBJCOPY) --only-keep-debug $< .debug/$@
+targets += $(modules-debug)
+endif
+
+debug_info: $(modules-debug) FORCE
+
+$(modules-debug): $(modules) FORCE
+ifdef CONFIG_DEBUG_INFO
+ $(call if_changed,debug_ko)
+endif
# Add FORCE to the prequisites of a target to force it to be always
rebuilt.
#
---------------------------------------------------------------------------
--
1.5.6
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