diff options
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 19 |
1 files changed, 18 insertions, 1 deletions
@@ -352,9 +352,14 @@ include scripts/Kbuild.include # Make variables (CC, etc...) AS = $(CROSS_COMPILE)as LD = $(CROSS_COMPILE)ld +LDFINAL = $(LD) CC = $(CROSS_COMPILE)gcc CPP = $(CC) -E +ifdef CONFIG_LTO +AR = $(CROSS_COMPILE)gcc-ar +else AR = $(CROSS_COMPILE)ar +endif NM = $(CROSS_COMPILE)nm STRIP = $(CROSS_COMPILE)strip OBJCOPY = $(CROSS_COMPILE)objcopy @@ -416,7 +421,7 @@ KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(S export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC -export CPP AR NM STRIP OBJCOPY OBJDUMP +export CPP AR NM STRIP OBJCOPY OBJDUMP LDFINAL export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS @@ -427,6 +432,17 @@ export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL export KBUILD_ARFLAGS +ifdef CONFIG_LTO +# 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 +# instead. +ifndef TMPDIR +TMPDIR ?= $(objtree) +export TMPDIR +$(info setting TMPDIR=$(objtree) for LTO build) +endif +endif + # When compiling out-of-tree modules, put MODVERDIR in the module # tree rather than in the kernel tree. The kernel tree might # even be read-only. @@ -781,6 +797,7 @@ endif include scripts/Makefile.kasan include scripts/Makefile.extrawarn +include scripts/Makefile.lto # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments KBUILD_CPPFLAGS += $(KCPPFLAGS) |