mirror of
https://github.com/nilfs-dev/nilfs-utils.git
synced 2026-01-26 13:43:15 +00:00
90fd5171f8
Add a mechanism to embed the git revision into the compiled binaries. This allows users and developers to identify the exact source commit used for the build, which aids in debugging and tracking versions. The git revision is obtained using 'git describe' and stored in the .comment ELF section using the new NILFS_UTILS_GITID() macro defined in util.h. This section is not loaded into memory at runtime. The embedded revision can be checked using 'readelf -p .comment <binary>'. This feature is opt-in to ensure deterministic builds for package maintainers. It is enabled only if the environment variable NILFS_UTILS_USE_GITID is set to 1, true, on, or yes when generating the configure script (e.g. by running autoconf or autogen.sh). Also, bump the minimum Autoconf version to 2.64 to utilize m4_esyscmd_s. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
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* util.h - utility definitions
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*/
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#ifndef __UTIL_H__
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#define __UTIL_H__
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#include <assert.h>
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#include <stdint.h> /* uint64_t, int64_t */
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#include <stddef.h> /* offsetof() */
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#include <stdlib.h>
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#include "compat.h"
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/* likely() and unlikely() macros */
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#ifndef BUG
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#define BUG() abort()
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#endif
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#define BUG_ON(x) assert(!(x))
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/* Force a compilation error if the condition is true */
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#define BUILD_BUG_ON(condition) ((void)sizeof(struct { int: -!!(condition); }))
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/* Macro to emit a git revision string into binaries */
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#if defined(NILFS_UTILS_GIT_REVISION) && defined(__GNUC__)
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#define NILFS_UTILS_GITID() \
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__asm__( \
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".section .comment\n\t" \
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".string \"nilfs-utils git: " NILFS_UTILS_GIT_REVISION "\"\n\t" \
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".previous")
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#else
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#define NILFS_UTILS_GITID() /* muted */
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#endif
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#define typecheck(type, x) \
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({ \
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type __dummy; \
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typeof(x) __dummy2; \
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(void)(&__dummy == &__dummy2); \
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1; \
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})
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#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
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#define DIV_ROUND_UP(n, m) (((n) + (m) - 1) / (m))
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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#define roundup(x, y) \
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({ \
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const typeof(y) __y = (y); \
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(((x) + __y - 1) / __y) * __y; \
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})
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/* offsetofend */
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#define offsetofend(TYPE, MEMBER) \
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(offsetof(TYPE, MEMBER) + sizeof(((TYPE *)0)->MEMBER))
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#define min_t(type, x, y) \
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({ type __x = (x); type __y = (y); __x < __y ? __x : __y; })
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#define max_t(type, x, y) \
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({ type __x = (x); type __y = (y); __x > __y ? __x : __y; })
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#define cnt64_gt(a, b) \
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(typecheck(uint64_t, a) && typecheck(uint64_t, b) && \
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((int64_t)(b) - (int64_t)(a) < 0))
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#define cnt64_ge(a, b) \
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(typecheck(uint64_t, a) && typecheck(uint64_t, b) && \
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((int64_t)(a) - (int64_t)(b) >= 0))
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#define cnt64_lt(a, b) cnt64_gt(b, a)
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#define cnt64_le(a, b) cnt64_ge(b, a)
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#define timeval_to_timespec(tv, ts) \
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do { \
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(ts)->tv_sec = (tv)->tv_sec; \
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(ts)->tv_nsec = (tv)->tv_usec * 1000; \
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} while (0)
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#endif /* __UTIL_H__ */
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