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Document steps to perform CMake configuration without network access #6649

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10 changes: 10 additions & 0 deletions COMPILING.md
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Expand Up @@ -82,6 +82,16 @@ files.
to generate IDE projects by supplying the `-G` flag. Run `cmake -G` for a
comprehensive list of supported back-ends.

As part of this step, CMake will download the back-end solver (see Section
"Compiling with alternative SAT solvers" in this document for configuration
options). Should it be necessary to perform this step without network access,
a solver can be downloaded ahead of the above `cmake` invocation as follows:
```
mkdir -p build/minisat2-download/minisat2-download-prefix/src/
wget http://ftp.debian.org/debian/pool/main/m/minisat2/minisat2_2.2.1.orig.tar.gz \
-O build/minisat2-download/minisat2-download-prefix/src/minisat2_2.2.1.orig.tar.gz
```

On macOS >10.14, the build will fail unless you explicitly specify
the full path to the compiler. This issue is being tracked
[here](https://github.com/diffblue/cbmc/issues/4956). The invocation thus
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