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Add debugging info about .so size to build output (#477)

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* Add debugging info about so size to build output

This adds a small python script to tools that captures before-and-after
.so sizes between builds and outputs this in the build output via a
string such as:

------ pybind11_tests.cpython-35m-x86_64-linux-gnu.so file size: 924696 (decrease of 73680 bytes = 7.38%)

------ pybind11_tests.cpython-35m-x86_64-linux-gnu.so file size: 998376 (increase of 73680 bytes = 7.97%)

------ pybind11_tests.cpython-35m-x86_64-linux-gnu.so file size: 998376 (no change)

Or, if there was no .so during the build, just the .so size by itself:

------ pybind11_tests.cpython-35m-x86_64-linux-gnu.so file size: 998376

This allows you to, for example, build, checkout a different branch,
rebuild, and easily see exactly the change in the pybind11_tests.so
size.

It also allows looking at the travis and appveyor build logs to get an
idea of .so/.dll sizes across different build systems.

* Minor libsize.py script changes

- Use RAII open
- Remove unused libsize=-1
- Report change as [+-]xyz bytes = [+-]a.bc%
This commit is contained in:
Jason Rhinelander
2016-11-04 09:47:41 -04:00
committed by Wenzel Jakob
parent 45e6e6f6eb
commit dc0b4bd2c9
3 changed files with 44 additions and 0 deletions
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@@ -32,3 +32,4 @@ MANIFEST
/build
/cmake/
.cache/
sosize-*.txt