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-rw-r--r--Documentation/kbuild/makefiles.txt22
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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.
In this example for a specific GCC version the build will error out explaining
to the user why it stops.
+ cc-cross-prefix
+ cc-cross-prefix is used to check if there exist a $(CC) in path with
+ one of the listed prefixes. The first prefix where there exist a
+ prefix$(CC) in the PATH is returned - and if no prefix$(CC) is found
+ then nothing is returned.
+ Additional prefixes are separated by a single space in the
+ call of cc-cross-prefix.
+ This functionality is usefull for architecture Makefile that try
+ to set CROSS_COMPILE to well know values but may have several
+ values to select between.
+ It is recommended only to try to set CROSS_COMPILE is it is a cross
+ build (host arch is different from target arch). And is CROSS_COMPILE
+ is already set then leave it with the old value.
+
+ Example:
+ #arch/m68k/Makefile
+ ifneq ($(SUBARCH),$(ARCH))
+ ifeq ($(CROSS_COMPILE),)
+ CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu-)
+ endif
+ endif
+
=== 4 Host Program support
Kbuild supports building executables on the host for use during the