On Sat, Feb 22, 2020 at 9:40 AM Alex Xu (Hello71) <alex_y_xu@xxxxxxxx> wrote: > > -pipe reduces unnecessary disk wear for systems where /tmp is not a > tmpfs, slightly increases compilation speed, and avoids leaving behind > files when gcc crashes. > > According to the gcc manual, "this fails to work on some systems where > the assembler is unable to read from a pipe; but the GNU assembler has > no trouble". We already require GNU ld on all platforms, so this is not > an additional dependency. LLVM as also supports pipes. > > -pipe has always been used for most architectures, this change > standardizes it globally. Most notably, arm, arm64, riscv, and x86 are > affected. > > Signed-off-by: Alex Xu (Hello71) <alex_y_xu@xxxxxxxx> <snip> > diff --git a/arch/arc/Makefile b/arch/arc/Makefile > index 20e9ab6cc521..b6a2f553771c 100644 > --- a/arch/arc/Makefile > +++ b/arch/arc/Makefile > @@ -9,7 +9,7 @@ ifeq ($(CROSS_COMPILE),) > CROSS_COMPILE := $(call cc-cross-prefix, arc-linux- arceb-linux-) > endif > > -cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__ > +cflags-y += -fno-common -fno-builtin -mmedium-calls -D__linux__ > cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7 > cflags-$(CONFIG_ISA_ARCV2) += -mcpu=hs38 > > diff --git a/arch/arm/Makefile b/arch/arm/Makefile > index db857d07114f..7711467e0797 100644 > --- a/arch/arm/Makefile > +++ b/arch/arm/Makefile > @@ -21,7 +21,6 @@ KBUILD_LDS_MODULE += $(srctree)/arch/arm/kernel/module.lds > endif > > GZFLAGS :=-9 > -#KBUILD_CFLAGS +=-pipe This was commented out by a very old commit, which is available in the historical git tree. https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=ce20ed858a20f6f04de475cae79e40d3697f4776 But, I could not parse the reason from the commit message. Russell, do you remember why? If arch maintainers are fine with this change, I can pick up it. Thanks. -- Best Regards Masahiro Yamada
