https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125773
Bug ID: 125773
Summary: -fdiagnostics-format=sarif-stderr counts TAB as 8
columns, when it should be 1
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: diagnostics
Assignee: dmalcolm at redhat dot com
Reporter: lahvuun at gmail dot com
Target Milestone: ---
Example code (there is a TAB before foo):
```
foo(void);
```
Output of ./gcc -c foo.c -fdiagnostics-format=sarif-stderr (shortened to the
relevant part):
```
"region":{"startLine":1,"startColumn":9,"endColumn":12}
```
I think startColumn should be 2 here, not 9. I'm far from an expert on SARIF,
but the way I understand it, SARIF producers are supposed to measure columns in
either UTF-16 code units or Unicode code points. See "3.14.27 columnKind
property" in the spec:
https://docs.oasis-open.org/sarif/sarif/v2.1.0/sarif-v2.1.0.html
TAB is 1 code unit in UTF-16 and 1 code point in Unicode, so GCC should count
it as 1 column either way, not 8. Clang with -fdiagnostics-format=sarif already
counts it as 1.
