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build: add -O3 optimization to CGO flags (#13877)

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CGO_CFLAGS and CGO_CXXFLAGS were being set without optimization flags,
which overrides Go's default -O2 and results in unoptimized C++ code.

This caused significant performance degradation in release builds
compared to local `go build` which uses the default optimization.

- build_darwin.sh: add -O3 to CGO_CFLAGS and CGO_CXXFLAGS exports
- Dockerfile: preserve CGO_CFLAGS/CGO_CXXFLAGS from build args instead
  of overwriting them
- app/README.md: update documentation to include -O3
This commit is contained in:
Jeffrey Morgan
2026-01-24 10:55:38 -08:00
committed by GitHub
parent 5267d31d56
commit f3b476c592
4 changed files with 14 additions and 6 deletions
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6
app/README.md
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@@ -75,9 +75,9 @@ The `-dev` flag enables:
CI builds with Xcode 14.1 for OS compatibility prior to v13. If you want to manually build v11+ support, you can download the older Xcode [here](https://developer.apple.com/services-account/download?path=/Developer_Tools/Xcode_14.1/Xcode_14.1.xip), extract, then `mv ./Xcode.app /Applications/Xcode_14.1.0.app` then activate with:
```
export CGO_CFLAGS=-mmacosx-version-min=12.0
export CGO_CXXFLAGS=-mmacosx-version-min=12.0
export CGO_LDFLAGS=-mmacosx-version-min=12.0
export CGO_CFLAGS="-O3 -mmacosx-version-min=12.0"
export CGO_CXXFLAGS="-O3 -mmacosx-version-min=12.0"
export CGO_LDFLAGS="-mmacosx-version-min=12.0"
export SDKROOT=/Applications/Xcode_14.1.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
export DEVELOPER_DIR=/Applications/Xcode_14.1.0.app/Contents/Developer
```