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authorRasmus Villemoes2015-03-21 02:50:01 +0100
committerMichal Marek2015-06-11 15:08:32 +0200
commit50ab9a69275dca588cb5ad5038657f069bbdeb56 (patch)
treeefbc69d993a916f8a38dd8d61bcc75eca4edcc97 /lib/Makefile
parentscripts: link-vmlinux: Don't pass page offset to kallsyms if XIP Kernel (diff)
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kbuild: include core debug info when DEBUG_INFO_REDUCED
With CONFIG_DEBUG_INFO_REDUCED, we do get quite a lot of debug info (around 22.7 MB for a defconfig+DEBUG_INFO_REDUCED). However, the "basenames must match" rule used by -femit-struct-debug-baseonly option means that we miss some core data structures, such as struct {device, file, inode, mm_struct, page} etc. We can easily get these included as well, while still getting the benefits of CONFIG_DEBUG_INFO_REDUCED (faster build times and smaller individual object files): All it takes is a dummy translation unit including a few strategic headers and compiled with a flag overriding -femit-struct-debug-baseonly. This increases the size of .debug_info by ~0.3%, but these 90 KB contain some rather useful info. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'lib/Makefile')
-rw-r--r--lib/Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Makefile b/lib/Makefile
index 6c37933336a0..c918538110ed 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -45,6 +45,9 @@ CFLAGS_kobject.o += -DDEBUG
CFLAGS_kobject_uevent.o += -DDEBUG
endif
+obj-$(CONFIG_DEBUG_INFO_REDUCED) += debug_info.o
+CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any)
+
obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
obj-$(CONFIG_GENERIC_PCI_IOMAP) += pci_iomap.o
obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o