linux-kernel - [PATCH v2 1/2] kbuild: pass jobserver to cmd_ld

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Date:   Tue, 19 Jul 2022 10:41:48 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     masahiroy@...nel.org
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Signed-off-by : Martin Liska" <mliska@...e.cz>
Subject: [PATCH v2 1/2] kbuild: pass jobserver to cmd_ld_vmlinux.o

Until the link-vmlinux.sh split (cf. the commit below), the linker was
run with jobserver set in MAKEFLAGS. After the split, the command in
Makefile.vmlinux_o is not prefixed by "+" anymore, so this information
is lost.

Restore it as linkers working in parallel (esp. the LTO ones) make a use
of it. In this case, it is gcc producing this warning otherwise:
lto-wrapper: warning: jobserver is not available: ‘--jobserver-auth=’ is not present in ‘MAKEFLAGS’

Cc: Sedat Dilek <sedat.dilek@...il.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Michal Marek <michal.lkml@...kovi.net>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Signed-off-by: Martin Liska <mliska@...e.cz>
Fixes: 5d45950dfbb1 (kbuild: move vmlinux.o link to scripts/Makefile.vmlinux_o)
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---

Notes:
    [v2] only commit message updated

 scripts/Makefile.vmlinux_o | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
index 84019814f33f..886db0659d9c 100644
--- a/scripts/Makefile.vmlinux_o
+++ b/scripts/Makefile.vmlinux_o
@@ -65,7 +65,7 @@ define rule_ld_vmlinux.o
 endef
 
 vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
-	$(call if_changed_rule,ld_vmlinux.o)
+	+$(call if_changed_rule,ld_vmlinux.o)
 
 targets += vmlinux.o
 
-- 
2.37.1