[PATCH 2/2] kbuild: handle excessively long argument lists

Jeff Johnson
2021-01-13T01:20:13Z

From: Mahesh Kumar Kalikot Veetil <mkalikot@codeaurora.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@codeaurora.org>
Signed-off-by: Jeff Johnson <jjohnson@codeaurora.org>
---
scripts/Makefile.build | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 252b7d2..d5ef345 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -425,7 +425,11 @@ $(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
+endif

$(multi-used-m): FORCE
$(call if_changed,link_multi-m)
--
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