Dear sun york-R58495, > On Aug 21, 2013, at 7:51 PM, Marek Vasut wrote: > > 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 <ma...@denx.de> > >>> Cc: Tom Rini <tr...@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. > > I didn't use this patch but I modified config.mk as this patch did. MAKEALL > works fine for "-a powerpc". It cuts my compiling time more than half for > 660+ boards.
That is still poor, it should be much faster. If you use separate ccache for each board, then it will be _much_ more performant. The problem is that when rebuilding all of those 680 configurations, the cached files get replaced by ones based on different board config all the time => you need to rebuild them => you loose performance. Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
