tree 32dd1253511bf68bf045bb9ead62db997c25c99f
parent de1c2f24bc1991beed8314ee5922f5768391537e
author Andre Kuhlenschmidt <andre.kuhlenschmidt@gmail.com> 1743017764 -0700
committer GitHub <noreply@github.com> 1743017764 -0700
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[flang][openacc] Make OpenACC block construct parse errors less verbose. (#131042)

This PR does reduces the verbosity of parser errors for OpenACC block
constructs that do not parse correctly because they are missing their
trailing end block directive by:
- Removing the redundant error messages created by parsing 3 different
styles of directive tokens.
- Providing a general mechanism of configuring the max number of
contexts printed for every syntax error.
- Not printing less specific contexts that are at the same location.

Prior to the changes:
```
$ flang -fc1 -fopenacc -fsyntax-only flang/test/Parser/acc-data-statement.f90 2>&1 | tee acc-data-statement.prior.log | wc -l
262
```

[acc-data-statement.prior.log](https://github.com/user-attachments/files/19298165/acc-data-statement.prior.log)

```
$ flang -fc1 -fopenacc -fsyntax-only flang/test/Parser/acc-data-statement.f90 2>&1 | tee acc-data-statement.prior.log | wc -l
73
```

[acc-data-statement.post.log](https://github.com/user-attachments/files/19298181/acc-data-statement.post.log)