Use go:linkname to access build.Default and modify Compiler in init function.
This is much simpler than patching defaultContext() and all its dependencies.
- Reduced from 137 lines to 27 lines
- Removed zcgo.go (no longer needed)
- Removed complex parseGoVersion, defaultContext, and helper functions
- Now just sets build.Default.Compiler = "gc" in init()
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- Created zcgo.go with defaultCGO_ENABLED constant (Go 1.24 pattern)
- Updated parseGoVersion to panic on unexpected input instead of fallback
- Added runtime.(*Func).Name stub to symtab.go for Go 1.21/1.22 compatibility
- Removed go1.23 build constraint from demo
- Removed internal/buildcfg package (replaced by zcgo.go)
These changes ensure the demo works across Go 1.21+ versions.
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- Created internal/buildcfg package with DefaultCGO_ENABLED constant
- Updated CGO_ENABLED handling to use buildcfg.DefaultCGO_ENABLED
- Added original Go stdlib comment for release tags
- Simplified toolTags usage by using it directly instead of wrapper function
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- Link internal/buildcfg.ToolTags variable instead of hardcoding tool tags
- Add comprehensive test cases in demo.go to verify:
- build.Default.Compiler is correctly patched to "gc"
- ToolTags are properly populated from internal/buildcfg
- ReleaseTags are correctly generated
- Validates the go/build patches work as expected
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- Remove /llgo from .gitignore (unnecessary)
- Move cgoSupported linkname to top with other linknames
- Fix goVersion initialization timing by making it local variable
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Add linkname directives and stdlib comments for defaultToolTags and
defaultReleaseTags variables to match Go standard library pattern. This
allows external packages (like gopherjs) to access these internal variables
via linkname, maintaining compatibility with packages that depend on this
behavior.
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Instead of creating a custom platform package, use the go:linkname
directive to directly link to Go's standard library internal/platform.CgoSupported
function. This approach:
- Eliminates the need to maintain a copy of platform support data
- Uses Go's canonical platform information directly
- Reduces code duplication and maintenance burden
- Follows Go's linkname pattern for accessing internal packages
Changes:
- Added import _ "unsafe" to enable linkname
- Added //go:linkname directive for cgoSupported function
- Removed custom runtime/internal/lib/internal/platform package
- Updated function call from platform.CgoSupported to cgoSupported
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Created runtime/internal/lib/internal/platform package to house the
CgoSupported function, following the established pattern used by other
internal packages like internal/itoa.
Changes:
- Created runtime/internal/lib/internal/platform/platform.go
- Moved cgoSupported function to platform.CgoSupported
- Updated runtime/internal/lib/go/build/build.go to import and use
the new package
This refactoring improves code organization by separating
platform-specific utilities into their own package, making the code
more maintainable and reusable.
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Replaced hardcoded goVersion constant with parseGoVersion() function
that dynamically extracts the Go version from runtime.Version().
This eliminates the need to update the version manually.
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Learned from other AltPkg implementations to create a truly minimal patch:
- Moved from 2073-line overlay to 127-line hasAltPkg implementation
- Replaced internal package dependencies:
* internal/buildcfg → runtime.GOARCH/GOOS
* internal/goversion → hardcoded constant (24)
* internal/platform.CgoSupported → simplified implementation
* internal/buildcfg.ToolTags → simplified buildToolTags()
- Used type alias (Context = build.Context) to reference stdlib types
- Added go/build to hasAltPkg map
- Removed overlay entirely
This follows the pattern used by other AltPkg packages and achieves
the minimal patching approach requested.
Demo verified working with llgo.
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