[r3wretrhy]

When stdout/stderr is not a terminal (or ColorMode::Off), sccache strips ANSI from cached compiler output before writing it back. That path used strip_ansi_escapes::Writer, which parses through VTE and drops any byte that is not valid UTF-8 ground-state input — including Latin-1 octets in #warning text, C1 controls, and bare \r.

So a plain gcc diagnostic like caf\xe9 survives, but the same bytes through sccache become caf with the 0xe9 gone. Repro from the issue (non-TTY stderr):

printf '#warning caf\xe9 na\xefve\nint f(void){ return 1; }\n' > lat1.c
gcc -c -Wall lat1.c -o /dev/null 2> bare.txt
sccache gcc -c -Wall lat1.c -o /dev/null 2> sccache.txt
cmp bare.txt sccache.txt

This replaces the VTE-based stripper with a small byte-wise CSI/OSC walker that only removes escape sequences and copies every other octet unchanged. ColorMode::On / TTY paths still write the original bytes.

Fixes #2864.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 59.74026% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.71%. Comparing base (50b3296) to head (7dd9487).

Files with missing lines	Patch %	Lines
src/commands.rs	59.74%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2879      +/-   ##
==========================================
+ Coverage   73.34%   76.71%   +3.36%     
==========================================
  Files          72       72              
  Lines       40776    40884     +108     
==========================================
+ Hits        29909    31363    +1454     
+ Misses      10867     9521    -1346     

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