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[flang] Update instructions for a standalone flang build #68361

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Oct 6, 2023
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[flang] Update instructions for a standalone flang build #68361

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12 changes: 9 additions & 3 deletions flang/docs/GettingStarted.md
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Expand Up @@ -141,8 +141,14 @@ code is in good shape.

### Building flang standalone
To do the standalone build, start by building flang in tree as described above.
This build is base build for subsequent standalone builds. Start each
standalone build the same way by cloning the source for llvm-project:
This build can be used as the base build for several subsequent standalone
builds. Set the environment variable **ROOT_DIR** to the directory that
contains the subdirectory `build` that was created previously, for example:
```bash
export ROOTDIR=/home/user/root
```
Start each standalone build the same way by cloning the source for
llvm-project:
```bash
mkdir standalone
cd standalone
Expand Down Expand Up @@ -175,7 +181,7 @@ cmake \
ninja
```

To run the flang tests on this build, execute the command in the "flang/build"
To run the flang tests on this build, execute the command in the `flang/build`
directory:
```bash
ninja check-flang
Expand Down