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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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38
meson.build
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@ -17,7 +17,6 @@ project(
so_version = ['3', '4', '1']
add_project_arguments([
'-DWLR_SRC_DIR="@0@"'.format(meson.current_source_dir()),
'-DWLR_USE_UNSTABLE',
], language: 'c')
@ -41,6 +40,43 @@ add_project_arguments(cc.get_supported_arguments([
'-Wno-unused-parameter',
]), language: 'c')
# Compute the relative path used by compiler invocations.
source_root = meson.current_source_dir().split('/')
build_root = meson.build_root().split('/')
relative_dir_parts = []
i = 0
in_prefix = true
foreach p : build_root
if i >= source_root.length() or not in_prefix or p != source_root[i]
in_prefix = false
relative_dir_parts += '..'
endif
i += 1
endforeach
i = 0
in_prefix = true
foreach p : source_root
if i >= build_root.length() or not in_prefix or build_root[i] != p
in_prefix = false
relative_dir_parts += p
endif
i += 1
endforeach
relative_dir = join_paths(relative_dir_parts) + '/'
# Strip relative path prefixes from the code if possible, otherwise hide them.
if cc.has_argument('-fmacro-prefix-map=/prefix/to/hide=')
add_project_arguments(
'-fmacro-prefix-map=@0@='.format(relative_dir),
language: 'c',
)
else
add_project_arguments(
'-DWLR_REL_SRC_DIR="@0@"'.format(relative_dir),
language: 'c',
)
endif
conf_data = configuration_data()
conf_data.set10('WLR_HAS_LIBCAP', false)
conf_data.set10('WLR_HAS_SYSTEMD', false)