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Nicolas Pitre 9059a3493e kconfig: fix relational operators for bool and tristate symbols 
Since commit 31847b67be ("kconfig: allow use of relations other than
(in)equality") it is possible to use relational operators in Kconfig
statements. However, those operators give unexpected results when
applied to bool/tristate values:

	(n < y) = y (correct)
	(m < y) = y (correct)
	(n < m) = n (wrong)

This happens because relational operators process bool and tristate
symbols as strings and m sorts before n. It makes little sense to do a
lexicographical compare on bool and tristate values though.

Documentation/kbuild/kconfig-language.txt states that expression can have
a value of 'n', 'm' or 'y' (or 0, 1, 2 respectively for calculations).
Let's make it so for relational comparisons with bool/tristate
expressions as well and document them. If at least one symbol is an
actual string then the lexicographical compare works just as before.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
History 2018-01-06 02:31:23 +09:00
..
00-INDEX Documentation: headers_install.txt is part of kbuild 2014-08-05 16:08:11 +02:00
headers_install.txt kbuild : Fix documentation of INSTALL_HDR_PATH 2015-06-22 09:56:07 -06:00
kbuild.txt kbuild: handle libs-y archives separately from built-in.o archives 2017-06-30 09:03:03 +09:00
kconfig-language.txt kconfig: fix relational operators for bool and tristate symbols 2018-01-06 02:31:23 +09:00
Kconfig.recursion-issue-01 kbuild: document recursive dependency limitation / resolution 2015-10-08 15:36:16 +02:00
Kconfig.recursion-issue-02 kbuild: document recursive dependency limitation / resolution 2015-10-08 15:36:16 +02:00
Kconfig.select-break kbuild: document recursive dependency limitation / resolution 2015-10-08 15:36:16 +02:00
kconfig.txt Documentation/kbuild/kconfig.txt: 'make listnewconfig' replaces: yes "" | make oldconfig 2013-10-08 23:51:50 +02:00
makefiles.txt DeviceTree for 4.15: 2017-11-14 18:25:40 -08:00
modules.txt kbuild: Fix a typo in documentation 2014-06-10 14:14:29 +02:00