cabal-version: 1.12
-- ^ 1.12 is the version included with GHC 7.2.1, the oldest version that
-- supports plugins.
--
-- https://cabal.readthedocs.io/en/stable/file-format-changelog.html
name: ghc-compat-plugin
version: 0.0.2.0
synopsis: Eases support for multiple GHC versions
description: Controls various GHC options and extensions to make compilation
across multiple versions easier, and to alert you to
incompatibilities.
maintainer: Greg Pfeil <greg@technomadic.org>
author: Greg Pfeil <greg@technomadic.org>
copyright: 2026 Greg Pfeil
-- GHC before 8.8.1 (and Cabal before 3.0) can’t deal with the
-- `Universal-FOSS-exception-1.0` SPDX license exception. Since it only makes
-- the license more lax, we just omit it from this field.
license: AGPL-3
license-file: LICENSE.AGPL-3.0-only
category: Compatibility, Compiler Plugins
build-type: Simple
extra-source-files:
CHANGELOG.md
README.md
docs/*.md
tested-with:
GHC ==7.10.3
|| ==8.0.2
|| ==8.2.2
|| ==8.4.1
|| ==8.6.1
|| ==8.8.1
|| ==8.10.1
|| ==9.0.1
|| ==9.2.1
|| ==9.4.1 || ==9.4.8
|| ==9.6.1 || ==9.6.7
|| ==9.8.1 || ==9.8.4
|| ==9.10.1 || ==9.10.2 || ==9.10.3
|| ==9.12.1 || ==9.12.2
|| ==9.14.1
homepage: https://github.com/sellout/ghc-compat-plugin#readme
bug-reports: https://github.com/sellout/ghc-compat-plugin/issues
source-repository head
type: git
location: https://github.com/sellout/ghc-compat-plugin.git
subdir: core
source-repository this
type: git
location: https://github.com/sellout/ghc-compat-plugin.git
subdir: core
-- NB: This is the repo version, which is distinct from the package version.
tag: v0.2.0
flag noisy-deprecations
description:
Prior to GHC 9.10, the @DEPRECATED@ pragma can’t distinguish between terms
and types. Consenquently, you can get spurious warnings when there’s a name
collision and the name in the other namespace is deprecated. Or you can
choose to not get those warnings, at the risk of not being warned when
there’s a name collision and the namespace you’re referencing is the one
that’s deprecated.
default: True
-- Because disabling this flag won’t help the solver.
manual: True
library
default-language: Haskell98
build-depends:
ghc >=7.2.1 && <9.16
default-extensions:
-- 6.8.1
NoImplicitPrelude
-- 6.10.1
NamedFieldPuns
PackageImports
exposed-modules:
GhcCompat
-- blockers for supporting GHC <7.10:
-- - use of `MIN_VERSION_GLASGOW_HASKELL`
if impl(ghc >= 7.10.1)
build-depends:
base >=4.8.0 && <4.23
if impl(ghc >= 8.0.1)
build-depends:
ghc-boot-th >=8.0.1 && <9.16
hs-source-dirs:
supported
other-modules:
GhcCompat.GhcRelease
GhcCompat.Opts
else
hs-source-dirs:
unsupported
if impl(ghc >= 8.0.1)
ghc-options:
-Weverything
-- This one just reports unfixable things, AFAICT.
-Wno-all-missed-specialisations
-- Type inference good.
-Wno-missing-local-signatures
-- Warns even when `Unsafe` is explicit, not inferred. See
-- https://gitlab.haskell.org/ghc/ghc/-/issues/16689
-Wno-unsafe
if impl(ghc < 8.8.1)
ghc-options:
-- This used to warn even when `Safe` was explicit.
-Wno-safe
else
ghc-options:
-Wall
if flag(noisy-deprecations)
cpp-options:
-DSELLOUT_NOISY_DEPRECATIONS
-- THIS PLUGIN WILL INFORM YOU AS TO WHETHER YOU NEED THE FOLLOWING
-- CONDITIONALS IN YOUR OWN CABAL FILES.
if impl(ghc >= 7.10.1)
ghc-options:
-- remove if the oldest supported version is GHC 7.8.1+
-fno-warn-deriving-typeable
if impl(ghc >= 8.6.1)
ghc-options:
-- remove if the oldest supported version is GHC 8.6.1+
-Wno-star-is-type
if impl(ghc >= 8.8.1)
ghc-options:
-- remove if the oldest supported version is GHC 8.2.1+
-Wno-missing-deriving-strategies
-- THIS PLUGIN ELIMINATES THE NEED FOR THE FOLLOWING CONDITIONALS IN YOUR OWN
-- CABAL FILES.
if impl(ghc >= 8.10.1)
ghc-options:
-- remove if the oldest supported version is GHC 8.10.1+
-Wno-prepositive-qualified-module
if impl(ghc >= 9.2.1)
ghc-options:
-- remove if the oldest supported version is GHC 6.8.1+
-Wno-missing-kind-signatures
if impl(ghc >= 9.8.1)
ghc-options:
-- remove if the oldest supported version is GHC 7.4.1+
-Wno-missing-poly-kind-signatures
-- remove if the oldest supported version is GHC 7.8.1+
-Wno-missing-role-annotations
if impl(ghc >= 9.14.1)
ghc-options:
-- remove if the oldest supported version is GHC 9.14.1+
-Wno-pattern-namespace-specifier