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authorSam Ravnborg <sam@neptun.(none)>2007-10-19 15:46:01 -0400
committerSam Ravnborg <sam@neptun.(none)>2007-10-19 15:46:01 -0400
commit910b40468a9ce3f2f5d48c5d260329c27d45adb5 (patch)
tree7c6957b94da9c9358839cde3f1ed6c827aac63a7 /Documentation/kbuild/makefiles.txt
parent50a8ec31c3a00594ceb7c5f1dcf2ecdaf6a5b847 (diff)
kbuild: introduce cc-cross-prefix
cc-cross-prefix is useful for the architecture that like to provide a default CROSS_COMPILE value, but may have several to select between. Sample usage: ifneq ($(SUBARCH),$(ARCH)) ifeq ($(CROSS_COMPILE),) CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) endif endif Actual usage by the different archs will taken care of later. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'Documentation/kbuild/makefiles.txt')
-rw-r--r--Documentation/kbuild/makefiles.txt22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index f099b814d383..6166e2d7da76 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -518,6 +518,28 @@ more details, with real examples.
518 In this example for a specific GCC version the build will error out explaining 518 In this example for a specific GCC version the build will error out explaining
519 to the user why it stops. 519 to the user why it stops.
520 520
521 cc-cross-prefix
522 cc-cross-prefix is used to check if there exist a $(CC) in path with
523 one of the listed prefixes. The first prefix where there exist a
524 prefix$(CC) in the PATH is returned - and if no prefix$(CC) is found
525 then nothing is returned.
526 Additional prefixes are separated by a single space in the
527 call of cc-cross-prefix.
528 This functionality is usefull for architecture Makefile that try
529 to set CROSS_COMPILE to well know values but may have several
530 values to select between.
531 It is recommended only to try to set CROSS_COMPILE is it is a cross
532 build (host arch is different from target arch). And is CROSS_COMPILE
533 is already set then leave it with the old value.
534
535 Example:
536 #arch/m68k/Makefile
537 ifneq ($(SUBARCH),$(ARCH))
538 ifeq ($(CROSS_COMPILE),)
539 CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu-)
540 endif
541 endif
542
521=== 4 Host Program support 543=== 4 Host Program support
522 544
523Kbuild supports building executables on the host for use during the 545Kbuild supports building executables on the host for use during the