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author | Daisuke Nojiri <dnojiri@chromium.org> | 2019-05-28 18:24:42 -0700 |
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committer | Commit Bot <commit-bot@chromium.org> | 2020-06-19 22:13:05 +0000 |
commit | b82ac7fd53b91c6835e6a4e95239ed03db89c351 (patch) | |
tree | 18706aff84b33864e49cebcffe27add6961cce1b | |
parent | f7a9b47693b7ad4906f75a8657b23597b68fd173 (diff) | |
download | chrome-ec-b82ac7fd53b91c6835e6a4e95239ed03db89c351.tar.gz |
common: Define markers for weak symbols
This patch introduces macros to mark weak symbols. These macros are
used to annotate weak definitions, declarations, and overriding
definitions.
__override_proto: declarations
__override: definitions which take precedence
__overridable: default (weak) definitions
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
BUG=chromium.org/964060
BRANCH=none
TEST=buildall
Change-Id: I44cec41e0523e285db19a890d084b52337f64a9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1633911
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Denis Brockus <dbrockus@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Denis Brockus <dbrockus@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2255319
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
Auto-Submit: Daisuke Nojiri <dnojiri@chromium.org>
-rw-r--r-- | include/common.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h index ddd310f5d4..ed2afcf81c 100644 --- a/include/common.h +++ b/include/common.h @@ -227,6 +227,33 @@ enum ec_error_list { #endif /* + * Weak symbol markers + * + * These macros are used to annotate weak definitions, their declarations, and + * overriding definitions. + * + * __override_proto: declarations + * __override: definitions which take precedence + * __overridable: default (weak) definitions + * + * For example, in foo.h: + * __override_proto void foo(void); + * + * and in foo.c: + * __overridable void foo(void) { + * ... + * } + * + * and in board.c: + * __override void foo(void) { + * ... + * } + */ +#define __override_proto +#define __override +#define __overridable __attribute__((weak)) + +/* * Mark functions that collide with stdlib so they can be hidden when linking * against libraries that require stdlib. HIDE_EC_STDLIB should be defined * before including common.h from code that links to cstdlib. |