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authorMasahiro Yamada <yamada.masahiro@socionext.com>2018-05-28 18:21:40 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-05-29 03:28:58 +0900
commit104daea149c45cc84842ce77a9bd6436d19f3dd8 (patch)
tree7f0aaa24e9fa03154a74b2bd7bcb93f24d678ea4 /arch/sh/Kconfig
parentkbuild: remove CONFIG_CROSS_COMPILE support (diff)
downloadlinux-dev-104daea149c45cc84842ce77a9bd6436d19f3dd8.tar.xz
linux-dev-104daea149c45cc84842ce77a9bd6436d19f3dd8.zip
kconfig: reference environment variables directly and remove 'option env='
To get access to environment variables, Kconfig needs to define a symbol using "option env=" syntax. It is tedious to add a symbol entry for each environment variable given that we need to define much more such as 'CC', 'AS', 'srctree' etc. to evaluate the compiler capability in Kconfig. Adding '$' for symbol references is grammatically inconsistent. Looking at the code, the symbols prefixed with 'S' are expanded by: - conf_expand_value() This is used to expand 'arch/$ARCH/defconfig' and 'defconfig_list' - sym_expand_string_value() This is used to expand strings in 'source' and 'mainmenu' All of them are fixed values independent of user configuration. So, they can be changed into the direct expansion instead of symbols. This change makes the code much cleaner. The bounce symbols 'SRCARCH', 'ARCH', 'SUBARCH', 'KERNELVERSION' are gone. sym_init() hard-coding 'UNAME_RELEASE' is also gone. 'UNAME_RELEASE' should be replaced with an environment variable. ARCH_DEFCONFIG is a normal symbol, so it should be simply referenced without '$' prefix. The new syntax is addicted by Make. The variable reference needs parentheses, like $(FOO), but you can omit them for single-letter variables, like $F. Yet, in Makefiles, people tend to use the parenthetical form for consistency / clarification. At this moment, only the environment variable is supported, but I will extend the concept of 'variable' later on. The variables are expanded in the lexer so we can simplify the token handling on the parser side. For example, the following code works. [Example code] config MY_TOOLCHAIN_LIST string default "My tools: CC=$(CC), AS=$(AS), CPP=$(CPP)" [Result] $ make -s alldefconfig && tail -n 1 .config CONFIG_MY_TOOLCHAIN_LIST="My tools: CC=gcc, AS=as, CPP=gcc -E" Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to '')
-rw-r--r--arch/sh/Kconfig4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 1851eaeee131..c8400e34e255 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -58,7 +58,7 @@ config SUPERH
<http://www.linux-sh.org/>.
config SUPERH32
- def_bool ARCH = "sh"
+ def_bool "$(ARCH)" = "sh"
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_IOREMAP_PROT if MMU && !X2TLB
@@ -77,7 +77,7 @@ config SUPERH32
select HAVE_CC_STACKPROTECTOR
config SUPERH64
- def_bool ARCH = "sh64"
+ def_bool "$(ARCH)" = "sh64"
select HAVE_EXIT_THREAD
select KALLSYMS