From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751876AbbCUBu1 (ORCPT ); Fri, 20 Mar 2015 21:50:27 -0400 Received: from mail-la0-f45.google.com ([209.85.215.45]:33875 "EHLO mail-la0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751164AbbCUBuY (ORCPT ); Fri, 20 Mar 2015 21:50:24 -0400 From: Rasmus Villemoes To: Michal Marek , Andrew Morton Cc: linux-kbuild@vger.kernel.org, Rasmus Villemoes , linux-kernel@vger.kernel.org Subject: [PATCH] kbuild: include core debug info when DEBUG_INFO_REDUCED Date: Sat, 21 Mar 2015 02:50:01 +0100 Message-Id: <1426902601-13524-1-git-send-email-linux@rasmusvillemoes.dk> X-Mailer: git-send-email 2.1.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- lib/Makefile | 3 +++ lib/debug_info.c | 27 +++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) create mode 100644 lib/debug_info.c diff --git a/lib/Makefile b/lib/Makefile index 58f74d2dd396..3d788091d60c 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 diff --git a/lib/debug_info.c b/lib/debug_info.c new file mode 100644 index 000000000000..2edbe27517ed --- /dev/null +++ b/lib/debug_info.c @@ -0,0 +1,27 @@ +/* + * This file exists solely to ensure debug information for some core + * data structures is included in the final image even for + * CONFIG_DEBUG_INFO_REDUCED. Please do not add actual code. However, + * adding appropriate #includes is fine. + */ +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include -- 2.1.3