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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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2
include/render/gles2.h
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@ -98,7 +98,7 @@ struct wlr_gles2_texture *gles2_get_texture(
void push_gles2_marker(const char *file, const char *func);
void pop_gles2_marker(void);
#define PUSH_GLES2_DEBUG push_gles2_marker(_wlr_strip_path(__FILE__), __func__)
#define PUSH_GLES2_DEBUG push_gles2_marker(_WLR_FILENAME, __func__)
#define POP_GLES2_DEBUG pop_gles2_marker()
#endif