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[libc] Add some integration features into newhdrgen #114272

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[libc] Add some integration features into newhdrgen #114272

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Commits on Oct 30, 2024

  1. [libc] Add some integration features into newhdrgen 

    This adds some command-line switches to the newhdrgen script
that facilitate more generalized build system integration.
These enable the use of the script in Fuchsia's GN build.

The --write-if-changed switch avoids touching the .h output file
if it's unchanged, which is beneficial to incremental rebuilds.

The --depfile switch writes out a make/ninja-compatible depfile
describing the inputs and outputs.  This is crucial for build
system integration when using the following new feature.

When the new --libc-dir switch is given, the YAML file argument
is optional.  Instead, the --h_def_file input file path must have
the --libc-dir path as a prefix and the yaml file is found in its
corresponding place in the libc source tree.
    @frobtech
    frobtech committed Oct 30, 2024
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  2. Restore old behavior for test suite with explicit YAML file arg

    @frobtech
    frobtech committed Oct 30, 2024
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  3. python formatting

    @frobtech
    frobtech committed Oct 30, 2024
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  4. Merge branch 'main' into p/libc-newhdrgen

    @frobtech
    frobtech authored Oct 30, 2024
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