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Speed up MATLAB mex build by caching shared C object files #60

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Merged
benfulcher merged 1 commit into from
Aug 21, 2026
Merged

Speed up MATLAB mex build by caching shared C object files #60

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19 changes: 17 additions & 2 deletions wrap_Matlab/mexAll.m
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Original file line number Diff line number Diff line change
Expand Up @@ -12,16 +12,31 @@
% Add path to the c file names
includeFiles = cellfun(@(x) fullfile(basePath, x), CFileNames, 'UniformOutput', false);

% Compile the shared files (M_wrapper.c plus everything in basePath) to
% object files once, rather than recompiling all of them from source for
% every one of the ~24 features below:
sourcesToCache = [{'M_wrapper.c'}, includeFiles];
objDir = tempname;
mkdir(objDir);
cleanupObj = onCleanup(@() rmdir(objDir,'s'));
fprintf('Compiling %u shared C files (once)...\n',numel(sourcesToCache));
for i = 1:numel(sourcesToCache)
mex(ipath{:}, '-c', '-outdir', objDir, sourcesToCache{i});
end
objFiles = dir(objDir);
objFiles = fullfile(objDir, {objFiles(~[objFiles.isdir]).name});

% Get function names
featureNames = GetAllFeatureNames(true);

% mex all feature functions separately
% mex all feature functions separately, linking each against the cached
% shared objects instead of recompiling them
numFeatures = length(featureNames);
for i = 1:numFeatures
featureName = featureNames{i};

fprintf('[%u/%u]: Compiling %s...\n', i,numFeatures,featureName);
mex(ipath{:}, ['catch22_', featureName,'.c'], 'M_wrapper.c', includeFiles{:})
mex(ipath{:}, ['catch22_', featureName,'.c'], objFiles{:})
fprintf('\n');
end

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