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authorMasahiro Yamada <yamada.masahiro@socionext.com>2018-05-28 12:21:40 +0300
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-05-28 21:28:58 +0300
commit104daea149c45cc84842ce77a9bd6436d19f3dd8 (patch)
tree7f0aaa24e9fa03154a74b2bd7bcb93f24d678ea4 /scripts/kconfig/lkc.h
parentf1089c92da791034af73478159626007cba7f092 (diff)
downloadlinux-104daea149c45cc84842ce77a9bd6436d19f3dd8.tar.xz
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 'scripts/kconfig/lkc.h')
-rw-r--r--scripts/kconfig/lkc.h5
1 files changed, 1 insertions, 4 deletions
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index 2628bc6a2141..ed3ff88e60ba 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -44,7 +44,6 @@ enum conf_def_mode {
#define T_OPT_MODULES 1
#define T_OPT_DEFCONFIG_LIST 2
-#define T_OPT_ENV 3
#define T_OPT_ALLNOCONFIG_Y 4
struct kconf_id {
@@ -103,6 +102,7 @@ void *xmalloc(size_t size);
void *xcalloc(size_t nmemb, size_t size);
void *xrealloc(void *p, size_t size);
char *xstrdup(const char *s);
+char *xstrndup(const char *s, size_t n);
struct gstr {
size_t len;
@@ -120,9 +120,6 @@ void str_printf(struct gstr *gs, const char *fmt, ...);
const char *str_get(struct gstr *gs);
/* symbol.c */
-extern struct expr *sym_env_list;
-
-void sym_init(void);
void sym_clear_all_valid(void);
struct symbol *sym_choice_default(struct symbol *sym);
const char *sym_get_string_default(struct symbol *sym);