On 2021-01-14 13:07, Nick Desaulniers wrote:
From: Mahesh Kumar Kalikot Veetil <mkalikot@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Jeff Johnson <jjohnson@xxxxxxxxxxxxxx>
---
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
Was this build tested?
$ make LLVM=1 LLVM_IAS=1 -j72 defconfig
scripts/Makefile.build:432: *** extraneous 'endif'. Stop.
make: *** [Makefile:535: scripts_basic] Error 2
(Please cc me on v2)
blush
It was tested on a workspace that also contains the Clang LTO series
https://patchwork.kernel.org/project/linux-kbuild/patch/20201211184633.3213045-3-samitolvanen@xxxxxxxxxx/
I messed up when trimming, will update in v2
