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-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