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GCC 15 internal compiler error with llvm - use clang instead

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modified use flags for clang
This commit is contained in:
Damien Coles 2026-01-24 21:10:41 -05:00
parent 9a4a970f76
commit 89d79e8cfa
2 changed files with 23 additions and 2 deletions
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20
docs/troubleshooting.md
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@ -217,6 +217,26 @@ dns=default
Adjust `-j4` based on your available RAM (roughly 2-3GB per job). With 24GB RAM, `-j6` to `-j8` is usually safe.
### LLVM/Clang GCC 15 ICE (Steam 32-bit)
When building LLVM with `abi_x86_32` for Steam, GCC 15 may crash with an internal compiler error (ICE):
```
internal compiler error: Segmentation fault
```
This typically occurs in `AMDGPURewriteAGPRCopyMFMA.cpp` and is triggered by `-march=znver3` optimizations.
**Fix:** Have LLVM compile itself with clang instead of GCC:
```bash
# Add to /etc/portage/package.use/steam
llvm-core/llvm clang
llvm-core/clang clang
```
This is already included in the provided `package.use/steam` file.
### Circular Dependency (freetype/harfbuzz)
During initial install, use `-harfbuzz` flag temporarily:

5
portage/package.use/steam
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@ -37,8 +37,9 @@ dev-util/spirv-tools abi_x86_32
dev-util/sysprof-capture abi_x86_32
gnome-base/librsvg abi_x86_32
gui-libs/libdecor abi_x86_32
llvm-core/clang abi_x86_32
llvm-core/llvm abi_x86_32
# Use clang to build LLVM/clang - workaround for GCC 15 ICE on AMDGPURewriteAGPRCopyMFMA.cpp
llvm-core/clang abi_x86_32 clang
llvm-core/llvm abi_x86_32 clang
media-gfx/graphite2 abi_x86_32
media-libs/alsa-lib abi_x86_32
media-libs/flac abi_x86_32