linux-kernel - [PATCH v2 2/2] kbuild: handle excessively long argument lists

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Date:   Thu, 14 Jan 2021 13:49:50 -0800
From:   Jeff Johnson <jjohnson@...eaurora.org>
To:     linux-kbuild@...r.kernel.org
Cc:     psodagud@...cinc.com, eberman@...cinc.com, ndesaulniers@...gle.com,
        Mahesh Kumar Kalikot Veetil <mkalikot@...eaurora.org>,
        Jeff Johnson <jjohnson@...eaurora.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] kbuild: handle excessively long argument lists

From: Mahesh Kumar Kalikot Veetil <mkalikot@...eaurora.org>

Modules with a large number of compilation units may be
exceeding AR and LD command argument list. Handle this gracefully by
writing the long argument list in a file. The command line options
read from file are inserted in place of the original @file option.

The usage is well documented at
https://www.gnu.org/software/make/manual/html_node/File-Function.html

Signed-off-by: Mahesh Kumar Kalikot Veetil <mkalikot@...eaurora.org>
Signed-off-by: Jeff Johnson <jjohnson@...eaurora.org>
---

Changes in v2:
  - Remove spurious endif
  
scripts/Makefile.build | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 252b7d2..787dca2 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -425,7 +425,10 @@ $(obj)/lib.a: $(lib-y) FORCE
 # module is turned into a multi object module, $^ will contain header file
 # dependencies recorded in the .*.cmd file.
 quiet_cmd_link_multi-m = LD [M]  $@
-      cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
+      cmd_link_multi-m =					\
+	$(file >$@.in,$(filter %.o,$^))				\
+	$(LD) $(ld_flags) -r -o $@ @$@.in;			\
+	rm -f $@.in
 
 $(multi-used-m): FORCE
 	$(call if_changed,link_multi-m)
-- 
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