From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
linux-arch@vger.kernel.org, linux-kbuild@vger.kernel.org,
Christophe Leroy <christophe.leroy@c-s.fr>,
Nicolas Pitre <nico@fluxnic.net>
Subject: [PATCH 2/4] kbuild: LD_DEAD_CODE_DATA_ELIMINATION no -ffunction-sections/-fdata-sections for module build
Date: Fri, 20 Apr 2018 17:34:12 +1000 [thread overview]
Message-ID: <20180420073414.23169-3-npiggin@gmail.com> (raw)
In-Reply-To: <20180420073414.23169-1-npiggin@gmail.com>
Modules do not tend to cope with -ffunction-sections, even though they
do not link with -gc-sections. It may be possible for unused symbols to
be trimmed from modules, but in general that would take much more work
in architecture module linker scripts.
For now, enable these only for kernel build.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
Makefile | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index e811e0c509c5..2ed651403bb4 100644
--- a/Makefile
+++ b/Makefile
@@ -799,8 +799,8 @@ KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
-KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
-KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
+KBUILD_CFLAGS_KERNEL += $(call cc-option,-ffunction-sections,)
+KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdata-sections,)
endif
# arch Makefile may override CC so keep this after arch Makefile is included
--
2.17.0
next prev parent reply other threads:[~2018-04-20 7:34 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-20 7:34 [PATCH 0/4] LD_DEAD_CODE_DATA_ELIMINATION fixes and enabling for powerpc Nicholas Piggin
2018-04-20 7:34 ` [PATCH 1/4] kbuild: Fix asm-generic/vmlinux.lds.h for LD_DEAD_CODE_DATA_ELIMINATION Nicholas Piggin
2018-04-20 7:34 ` Nicholas Piggin [this message]
2018-04-20 7:34 ` [PATCH 3/4] kbuild: Allow LD_DEAD_CODE_DATA_ELIMINATION to be selectable if enabled Nicholas Piggin
2018-04-20 7:34 ` [PATCH 4/4] powerpc: Allow LD_DEAD_CODE_DATA_ELIMINATION to be selected Nicholas Piggin
2018-04-20 10:00 ` Mathieu Malaterre
2018-04-20 10:41 ` Nicholas Piggin
2018-04-20 20:08 ` Mathieu Malaterre
2018-04-21 2:48 ` Nicholas Piggin
2018-05-02 9:17 ` Mathieu Malaterre
2018-05-02 12:24 ` Nicholas Piggin
2018-05-14 19:10 ` Mathieu Malaterre
2018-04-21 7:16 ` christophe leroy
2018-04-23 11:01 ` Mathieu Malaterre
2018-05-07 0:46 ` Masahiro Yamada
2018-05-07 9:53 ` Nicholas Piggin
2018-04-20 10:01 ` Christophe LEROY
2018-04-20 10:36 ` Nicholas Piggin
2018-04-20 13:21 ` Christophe LEROY
2018-04-20 10:39 ` Christophe LEROY
2018-04-20 9:59 ` [PATCH 0/4] LD_DEAD_CODE_DATA_ELIMINATION fixes and enabling for powerpc Mathieu Malaterre
2018-04-20 10:02 ` Christophe LEROY
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