Messages in this thread Patch in this message | | | From | Arnd Bergmann <> | Subject | [PATCH 7/7] Kbuild: lto: pass -m32/-m64 to to LDFINAL | Date | Fri, 2 Feb 2018 17:21:04 +0100 |
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Building randconfig kernels with a biarch compiler fails with LTO when the final link uses a different target architecture compared to the earlier compilation stages.
Setting -m32 or -m64 in ${LDFINAL} solves this problem, though my feeling is that there is a better way to do this. There might also be other from KBUILD_CFLAGS that we may need in LDFINAL.
Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- Makefile | 2 +- arch/x86/Makefile | 2 ++ scripts/Makefile.lto | 2 +- 3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile index 3b214c5a51a5..1a82fa39f82b 100644 --- a/Makefile +++ b/Makefile @@ -440,7 +440,7 @@ export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL -export KBUILD_ARFLAGS +export KBUILD_ARFLAGS KBUILD_BIARCHFLAGS # When compiling out-of-tree modules, put MODVERDIR in the module # tree rather than in the kernel tree. The kernel tree might diff --git a/arch/x86/Makefile b/arch/x86/Makefile index e79f0fda9aea..12425aafc7fc 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -69,6 +69,7 @@ ifeq ($(CONFIG_X86_32),y) biarch := $(call cc-option,-m32) KBUILD_AFLAGS += $(biarch) KBUILD_CFLAGS += $(biarch) + KBUILD_BIARCHFLAGS += $(biarch) KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return @@ -97,6 +98,7 @@ else biarch := -m64 KBUILD_AFLAGS += -m64 KBUILD_CFLAGS += -m64 + KBUILD_BIARCHFLAGS += $(biarch) # Align jump targets to 1 byte, not the default 16 bytes: KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1) diff --git a/scripts/Makefile.lto b/scripts/Makefile.lto index 2d6995ba7d0b..e57d025b7728 100644 --- a/scripts/Makefile.lto +++ b/scripts/Makefile.lto @@ -72,7 +72,7 @@ endif KBUILD_CFLAGS += ${LTO_CFLAGS} LDFINAL := ${CONFIG_SHELL} ${srctree}/scripts/gcc-ld \ - ${LTO_FINAL_CFLAGS} + ${LTO_FINAL_CFLAGS} ${KBUILD_BIARCHFLAGS} # LTO gcc creates a lot of files in TMPDIR, and with /tmp as tmpfs # it's easy to drive the machine OOM. Use the object directory -- 2.9.0
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