Messages in this thread Patch in this message | | | Date | Tue, 13 Feb 2007 22:06:19 -0800 | From | Randy Dunlap <> | Subject | kbuild feature/question: default ARCH |
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Hi,
I'd like for kbuild to default ARCH to the already-symlinked arch in include/asm-$(ARCH) if ARCH is not specified on the command line or in the environment. I have a non-working patch, complete with a circular dependency which is dropped:
make: Circular ' <- ' dependency dropped.
Any suggestions for how to complete this?
Thanks. ---
From: Randy Dunlap <randy.dunlap@oracle.com>
If ARCH is unspecified (command line or environment) and if include/asm is already a symlink to include/asm-$ARCH, use that ARCH as the default instead of the host ARCH. Undo the effect of this by using 'make mrproper' or just 'rm include/asm'.
This allows us to drop 'ARCH=fobr' for subsequent builds of the same ARCH, after using it in a build one time (not counting make *config).
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> --- Makefile | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
--- linux-2.6.20-git9.orig/Makefile +++ linux-2.6.20-git9/Makefile @@ -172,6 +172,10 @@ SUBARCH := $(shell uname -m | sed -e s/i # make ARCH=ia64 # Another way is to have ARCH set in the environment. # The default ARCH is the host where make is executed. +# +# However, if include/asm is already a symlink to include/asm-$ARCH, +# use that ARCH as the default instead of the host ARCH. +# Undo the effect of this by using 'make mrproper' or just 'rm include/asm'. # CROSS_COMPILE specify the prefix used for all executables used # during compilation. Only gcc and related bin-utils executables @@ -182,6 +186,20 @@ SUBARCH := $(shell uname -m | sed -e s/i # Default value for CROSS_COMPILE is not to prefix executables # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile +# if ARCH is unspecified & symlink include/asm exists, set ARCH to +# its symlink arch +@echo ' CHK DEF ARCH -> include/asm:' +$(Q)if [ "$(ARCH)" == "" -a -h $(srctree)/include/asm ]; then \ + symlink=`readlink include/asm` \ + len=`expr length $symlink` \ + if [ len -le 4 ]; then \ + @echo ' no symlink for include/asm' \ + else \ + ARCH=${symlink:4} \ + @echo ' ARCH symlink to ${ARCH}' \ + fi \ +fi + ARCH ?= $(SUBARCH) CROSS_COMPILE ?= - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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