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kbuild: document cc-fullversion

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Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Sam Ravnborg 2007-05-28 22:26:55 +02:00
parent f5e83fa4c0
commit 7015030faf
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14
Documentation/kbuild/makefiles.txt
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@ -501,6 +501,20 @@ more details, with real examples.
The third parameter may be a text as in this example, but it may also
be an expanded variable or a macro.
cc-fullversion
cc-fullversion is useful when the exact version of gcc is needed.
One typical use-case is when a specific GCC version is broken.
cc-fullversion points out a more specific version than cc-version does.
Example:
#arch/powerpc/Makefile
$(Q)if test "$(call cc-fullversion)" = "040200" ; then \
echo -n '*** GCC-4.2.0 cannot compile the 64-bit powerpc ' ; \
false ; \
fi
In this example for a specific GCC version the build will error out explaining
to the user why it stops.
=== 4 Host Program support