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-rw-r--r--.gitignore1
-rw-r--r--Makefile5
-rw-r--r--lib/Kconfig.debug15
3 files changed, 21 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
index f4c0b091dcf4..e213b27f3921 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@
*.gcno
modules.builtin
Module.symvers
+*.dwo
#
# Top-level generic files
diff --git a/Makefile b/Makefile
index 89fe23a0825c..e5a269465f99 100644
--- a/Makefile
+++ b/Makefile
@@ -684,7 +684,11 @@ endif
endif
ifdef CONFIG_DEBUG_INFO
+ifdef CONFIG_DEBUG_INFO_SPLIT
+KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
+else
KBUILD_CFLAGS += -g
+endif
KBUILD_AFLAGS += -Wa,-gdwarf-2
endif
@@ -1372,6 +1376,7 @@ clean: $(clean-dirs)
@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
-o -name '*.ko.*' \
+ -o -name '*.dwo' \
-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
-o -name '*.symtypes' -o -name 'modules.order' \
-o -name modules.builtin -o -name '.tmp_*.o.*' \
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7cfcc1b8e101..910355da9d14 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -143,6 +143,21 @@ config DEBUG_INFO_REDUCED
DEBUG_INFO build and compile times are reduced too.
Only works with newer gcc versions.
+config DEBUG_INFO_SPLIT
+ bool "Produce split debuginfo in .dwo files"
+ depends on DEBUG_INFO
+ help
+ Generate debug info into separate .dwo files. This significantly
+ reduces the build directory size for builds with DEBUG_INFO,
+ because it stores the information only once on disk in .dwo
+ files instead of multiple times in object files and executables.
+ In addition the debug information is also compressed.
+
+ Requires recent gcc (4.7+) and recent gdb/binutils.
+ Any tool that packages or reads debug information would need
+ to know about the .dwo files and include them.
+ Incompatible with older versions of ccache.
+
config ENABLE_WARN_DEPRECATED
bool "Enable __deprecated logic"
default y