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| author | Hauke Mehrtens <hauke@hauke-m.de> | 2020-06-20 18:48:32 +0200 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2020-06-22 20:55:02 +0200 |
| commit | cc203387cc17783a8b6715dcaf43c324cc415212 (patch) | |
| tree | 329b9232273b8fe635f145b9542b09d5d3795cda | |
| parent | d715a931e24a943aa4694b023cfe99244ef004f3 (diff) | |
| download | backports-cc203387cc17783a8b6715dcaf43c324cc415212.tar.gz | |
backports: Add fallthrough attribute
This adds the fallthrough attribute from Linux commit 294f69e662d1
("compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use")
This also adds the __has_attribute() define for older compilers like
GCC < 5.
linux/compiler_attributes.h needs to be included, this file was only
added in more recent kernel versions.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
| -rw-r--r-- | backport/backport-include/linux/compiler.h | 2 | ||||
| -rw-r--r-- | backport/backport-include/linux/compiler_attributes.h | 34 |
2 files changed, 36 insertions, 0 deletions
diff --git a/backport/backport-include/linux/compiler.h b/backport/backport-include/linux/compiler.h index 53c069df..51a6ec2c 100644 --- a/backport/backport-include/linux/compiler.h +++ b/backport/backport-include/linux/compiler.h @@ -2,6 +2,8 @@ #define __BACKPORT_LINUX_COMPILER_H #include_next <linux/compiler.h> +#include <linux/compiler_attributes.h> + #ifndef __rcu #define __rcu #endif diff --git a/backport/backport-include/linux/compiler_attributes.h b/backport/backport-include/linux/compiler_attributes.h new file mode 100644 index 00000000..31ddc163 --- /dev/null +++ b/backport/backport-include/linux/compiler_attributes.h @@ -0,0 +1,34 @@ +#ifndef _BACKPORTS_LINUX_COMPILER_ATTRIBUTES_H +#define _BACKPORTS_LINUX_COMPILER_ATTRIBUTES_H 1 + +#if LINUX_VERSION_IS_GEQ(4,20,0) +#include_next <linux/compiler_attributes.h> +#endif + +#ifndef __has_attribute +# define __has_attribute(x) __GCC4_has_attribute_##x +#endif + +#ifndef __GCC4_has_attribute___fallthrough__ +# define __GCC4_has_attribute___fallthrough__ 0 +#endif /* __GCC4_has_attribute___fallthrough__ */ + +#ifndef fallthrough +/* + * Add the pseudo keyword 'fallthrough' so case statement blocks + * must end with any of these keywords: + * break; + * fallthrough; + * goto <label>; + * return [expression]; + * + * gcc: https://gcc.gnu.org/onlinedocs/gcc/Statement-Attributes.html#Statement-Attributes + */ +#if __has_attribute(__fallthrough__) +# define fallthrough __attribute__((__fallthrough__)) +#else +# define fallthrough do {} while (0) /* fallthrough */ +#endif +#endif /* fallthrough */ + +#endif /* _BACKPORTS_LINUX_COMPILER_ATTRIBUTES_H */ |