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Use -fmacro-prefix-map to strip build path

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This commit matches sway's 2dc4978d8af326c310057ca8fd22a4c7f5d09335.

To help ensure a reproducible build (when debug info is disabled),
the meson build script now uses the -fmacro-prefix-map command line
argument supported by GCC to strip the build-path dependent bytes
of each __FILE__ string used by wlr_log and related functions.

A rather ugly algorithm is used to compute the relative path between
the build and source folders, because meson has no specific function
for this.

When the compiler does not support -fmacro-prefix-map, fall back
to shifting the start of each __FILE__ string by the length of the
relative path to the source directory.
This commit is contained in:
Manuel Stoeckl 2019-07-16 13:04:27 -04:00 • committed by Drew DeVault
parent 9e8f952997
commit bb05617414
4 changed files with 47 additions and 22 deletions
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17
util/log.c
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@ -81,23 +81,6 @@ void _wlr_log(enum wlr_log_importance verbosity, const char *fmt, ...) {
va_end(args);
}
// strips the path prefix from filepath
// will try to strip WLR_SRC_DIR as well as a relative src dir
// e.g. '/src/build/wlroots/backend/wayland/backend.c' and
// '../backend/wayland/backend.c' will both be stripped to
// 'backend/wayland/backend.c'
const char *_wlr_strip_path(const char *filepath) {
static int srclen = sizeof(WLR_SRC_DIR);
if (strstr(filepath, WLR_SRC_DIR) == filepath) {
filepath += srclen;
} else if (*filepath == '.') {
while (*filepath == '.' || *filepath == '/') {
++filepath;
}
}
return filepath;
}
enum wlr_log_importance wlr_log_get_verbosity(void) {
return log_importance;
}