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Use -fmacro-prefix-map to strip build path

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Because meson does not provide a simple way to get the relative build
path, it is computed with a pair of foreach loops. As meson does not
have a simple way to compute string length (except via underscorify
and 63 split operations), the build script uses a shell command
instead.

If the compiler does not suppot -fmacro-prefix-map, then fall back
to passing in the relative path prefix, and use its length to offset
the uses of __FILE__ in log messages so that the build path is at
least still not included in the logs. This is significantly more
efficient than calling _sway_strip_path.
This commit is contained in:
Manuel Stoeckl 2019-06-22 23:13:19 -04:00 • committed by Drew DeVault
parent e3a3917d3a
commit 2dc4978d8a
3 changed files with 48 additions and 25 deletions
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16
include/log.h
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@ -33,22 +33,26 @@ void _sway_vlog(sway_log_importance_t verbosity, const char *format, va_list arg
void _sway_abort(const char *filename, ...) ATTRIB_PRINTF(1, 2);
bool _sway_assert(bool condition, const char* format, ...) ATTRIB_PRINTF(2, 3);
// TODO: get meson to precompute this, for better reproducibility/less overhead
const char *_sway_strip_path(const char *filepath);
#ifdef SWAY_REL_SRC_DIR
// strip prefix from __FILE__, leaving the path relative to the project root
#define _SWAY_FILENAME ((const char *)__FILE__ + sizeof(SWAY_REL_SRC_DIR) - 1)
#else
#define _SWAY_FILENAME __FILE__
#endif
#define sway_log(verb, fmt, ...) \
_sway_log(verb, "[%s:%d] " fmt, _sway_strip_path(__FILE__), __LINE__, ##__VA_ARGS__)
_sway_log(verb, "[%s:%d] " fmt, _SWAY_FILENAME, __LINE__, ##__VA_ARGS__)
#define sway_vlog(verb, fmt, args) \
_sway_vlog(verb, "[%s:%d] " fmt, _sway_strip_path(__FILE__), __LINE__, args)
_sway_vlog(verb, "[%s:%d] " fmt, _SWAY_FILENAME, __LINE__, args)
#define sway_log_errno(verb, fmt, ...) \
sway_log(verb, fmt ": %s", ##__VA_ARGS__, strerror(errno))
#define sway_abort(FMT, ...) \
_sway_abort("[%s:%d] " FMT, _sway_strip_path(__FILE__), __LINE__, ##__VA_ARGS__)
_sway_abort("[%s:%d] " FMT, _SWAY_FILENAME, __LINE__, ##__VA_ARGS__)
#define sway_assert(COND, FMT, ...) \
_sway_assert(COND, "[%s:%d] %s:" FMT, _sway_strip_path(__FILE__), __LINE__, __PRETTY_FUNCTION__, ##__VA_ARGS__)
_sway_assert(COND, "[%s:%d] %s:" FMT, _SWAY_FILENAME, __LINE__, __PRETTY_FUNCTION__, ##__VA_ARGS__)
#endif