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33 lines
989 B
XML
33 lines
989 B
XML
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="sec-debug-build">
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<title>Debugging Build Failures</title>
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<para>At the beginning of each phase, the set of all shell variables
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is written to the file <filename>env-vars</filename> at the top-level
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build directory. This is useful for debugging: it allows you to
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recreate the environment in which a build was performed. For
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instance, if a build fails, then assuming you used the
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<option>-K</option> flag, you can go to the output directory and
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<quote>switch</quote> to the environment of the builder:
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<screen>
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$ nix-build -K ./foo.nix
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... fails, keeping build directory `/tmp/nix-1234-0'
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$ cd /tmp/nix-1234-0
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$ source env-vars
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<lineannotation>(edit some files...)</lineannotation>
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$ make
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<lineannotation>(execution continues with the same GCC, make, etc.)</lineannotation></screen>
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</para>
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</section>
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