[U-Boot] [U-Boot, 1/2] common: Add CCACHE variable to allow use of ccache
Marek Vasut
marex at denx.de
Thu Aug 22 04:51:21 CEST 2013
Dear York Sun,
> On 05/20/2013 10:25 AM, Marek Vasut wrote:
> > Prefix HOSTCC and CC with CCACHE variable to allow easy use of ccache.
> > In case the user wants to use ccache, exporting CCACHE=ccache will do
> > the trick. It is of course possible to either make the cross-compiler
> > name into a shellscript which invokes the ccache and the compiler, but
> > setting this variable makes use of ccache easier and more convenient.
> >
> > Using ccache becomes convenient when using MAKEALL for large build
> > tests, where the speedup after building the cache for the first time
> > is about 4-6 times.
> >
> > Signed-off-by: Marek Vasut <marex at denx.de>
> > Cc: Tom Rini <trini at ti.com>
> >
> > ---
> > config.mk | 8 +++++---
> >
> > 1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/config.mk b/config.mk
> > index 1fd109f..d59ded2 100644
> > --- a/config.mk
> > +++ b/config.mk
> > @@ -98,6 +98,8 @@ else
> >
> > HOSTCC = gcc
> > endif
> >
> > +HOSTCC := $(CCACHE) $(HOSTCC)
> > +
> >
> > ifeq ($(HOSTOS),cygwin)
> > HOSTCFLAGS += -ansi
> > endif
> >
> > @@ -140,13 +142,13 @@ binutils-version = $(shell $(SHELL)
> > $(SRCTREE)/tools/binutils-version.sh $(AS))
> >
> > #
> > # Include the make variables (CC, etc...)
> > #
> >
> > -AS = $(CROSS_COMPILE)as
> > +AS = $(CCACHE) $(CROSS_COMPILE)as
> >
> > # Always use GNU ld
> > LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
> >
> > then echo "$(CROSS_COMPILE)ld.bfd"; else echo
"$(CROSS_COMPILE)ld";
> > fi;)
> >
> > -CC = $(CROSS_COMPILE)gcc
> > +CC = $(CCACHE) $(CROSS_COMPILE)gcc
> >
> > CPP = $(CC) -E
> > AR = $(CROSS_COMPILE)ar
> > NM = $(CROSS_COMPILE)nm
> >
> > @@ -320,7 +322,7 @@ endif
> >
> > ########################################################################
> > #
> >
> > -export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE
\
> > +export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE
> > CCACHE \
> >
> > AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
> >
> > export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS
CPPFLAGS
> > CFLAGS AFLAGS
>
> Where did this patch go? I found it useful.
It needs additional fixes, try running with MAKEALL and you will see the problem
-- the problem is you would need separate ccache for each MAKEALL thread.
Best regards,
Marek Vasut
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