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angerman and others added 30 commits September 11, 2025 10:29
This change reverts part of !14544, which forces the bootstrap
compiler to have ghc-internal.  As such it breaks booting with
ghc 9.8.4. A better solution would be to make this conditional
on the ghc version in the cabal file!
mermaid is a common diagram format that can be inlined in markdown
files, and e.g. github will even render it.  This change adds
support for mermaid diagram output to ghc-pkg.
This adds support to ghc-pkg to infer a package-db from a target name.
When the library dirs in the package conf files are not set up correctly,
the JS linker will happily ignore such packages and not link against them,
although they're part of the link plan.

Fixes #26383
Make the first simple optimization pass after desugaring a real CoreToDo
pass. This allows CorePlugins to decide whether they want to be executed
before or after this pass.
Running the testsuite without Hadrian should set config.debug_rts
correctly too.
It's more user-friendly to directly print the right thing instead of
requiring the user to retry with the additional `-dppr-debug` flag.
When GHC is linked statically, the stdout C global variable that GHC uses
isn't shared with the stdout C global variable used by loaded code.

As a consequence, the latter must be explicitly flushed because GHC
won't flush it before exiting.
This change adds more information about the symbol and addresses
we try to relocate in the linker.  This significantly helps when
deubbging relocation issues reported by users.
The referenced issue 20706 also doesn't list T13786 as a broken test.
There is no signal 0. The signal mask is 1-32.
By mistake we tried to use deriveConstant without passing
`--gcc-flag -fcommon` (which Hadrian does) and it failed.

This patch adds deriveConstant support for constants stored in the .bss
section so that deriveConstant works without passing `-fcommon` to the C
compiler.
This commit restructures the Runtime System (RTS) components for better
modularity and reusability across different build configurations. The
changes enable cleaner separation of concerns and improved support for
cross-compilation scenarios.

Key changes:
- Extract RTS headers into standalone rts-headers package
  * Moved include/rts/Bytecodes.h to rts-headers
  * Moved include/rts/storage/ClosureTypes.h to rts-headers
  * Moved include/rts/storage/FunTypes.h to rts-headers
  * Moved include/stg/MachRegs/* to rts-headers
- Create rts-fs package for filesystem utilities
  * Extracted filesystem code from utils/fs
  * Provides reusable filesystem operations for RTS
- Rename utils/iserv to utils/ghc-iserv for consistency
  * Better naming alignment with other GHC utilities
  * Updated all references throughout the codebase
- Update RTS configuration and build files
  * Modified rts/configure.ac for new structure
  * Updated rts.cabal with new dependencies
  * Adjusted .gitignore for new artifacts

Rationale:
The modularization allows different stages of the compiler build to
share common RTS components without circular dependencies. This is
particularly important for:
- Cross-compilation where host and target RTS differ
- JavaScript backend which needs selective RTS components
- Stage1/Stage2 builds that require different RTS configurations

Contributors:
- Moritz Angermann: RTS modularization architecture and implementation
- Sylvain Henry: JavaScript backend RTS adjustments
- Andrea Bedini: Build system integration

This refactoring maintains full backward compatibility while providing
a cleaner foundation for multi-target support.
angerman and others added 6 commits September 11, 2025 11:02
This commit introduces a comprehensive cabal-based build infrastructure
to support multi-target and cross-compilation scenarios for GHC. The new
build system provides a clean separation between different build stages
and better modularity for toolchain components.

Key changes:
- Add Makefile with stage1, stage2, and stage3 build targets
- Create separate cabal.project files for each build stage
- Update configure.ac for new build system requirements
- Adapt hie.yaml to support cabal-based builds
- Update GitHub CI workflow for new build process

Build stages explained:
- Stage 1: Bootstrap compiler built with system GHC
- Stage 2: Intermediate compiler built with Stage 1
- Stage 3: Final compiler built with Stage 2 (for validation)

This modular approach enables:
- Clean cross-compilation support
- Better dependency management
- Simplified build process for different targets
- Improved build reproducibility

Contributors:
- Andrea Bedini: Build system design and Makefile implementation
- Moritz Angermann: Cross-compilation infrastructure

The new build system maintains compatibility with existing workflows
while providing a more maintainable foundation for future enhancements.
While we do want to drop this, for now, to keep the diff to upstream
small, we will just disable it with [10,100] range, which should
include all relevent LLVM versions in the foresable future.
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3 participants