Only install handlers when HAVE_SIGNAL_H

.github/workflows/ci.yaml

@@ -79,3 +79,46 @@ jobs:
     - name: Haddock
       if: matrix.ghc != '8.0'
       run: cabal haddock all
+
+  build-wasi:
+    runs-on: ubuntu-latest
+    env:
+      GHC_WASM_META_REV: 5ad5e045f52609eab12c7e09ed9b110980807957
+      FLAVOUR: '9.6'
+    steps:
+    - name: setup-ghc-wasm32-wasi
+      run: |
+        cd $(mktemp -d)
+        curl -L https://gitlab.haskell.org/ghc/ghc-wasm-meta/-/archive/$GHC_WASM_META_REV/ghc-wasm-meta-master.tar.gz | tar xz --strip-components=1
+        ./setup.sh
+        ~/.ghc-wasm/add_to_github_path.sh
+    - uses: actions/checkout@v3
+
+    - uses: actions/cache@v3
+      with:
+        path: |
+          ~/.ghc-wasm/.cabal/store
+          dist-newstyle
+        key: build-wasi-${{ runner.os }}-wasm-meta-${{ env.GHC_WASM_META_REV }}-flavour-${{ env.FLAVOUR }}-${{ github.sha }}
+        restore-keys: |
+          build-wasi-${{ runner.os }}-wasm-meta-${{ env.GHC_WASM_META_REV }}-flavour-${{ env.FLAVOUR }}-
+
+    - name: Build
+      run: |
+        wasm32-wasi-cabal build all
+
+        TEST_WRAPPERS=$(mktemp -d)
+        echo $TEST_WRAPPERS >> $GITHUB_PATH
+        wasm32-wasi-cabal install ./core-tests
+        for test in tasty-core-tests exit-status-test resource-release-test failing-pattern-test; do
+          echo '#!/usr/bin/env bash' > $TEST_WRAPPERS/$test
+          echo "wasmtime --mapdir /::/ --env PWD=\"\$PWD\" ~/.ghc-wasm/.cabal/bin/$test.wasm -- \"\$@\"" \
+            >> $TEST_WRAPPERS/$test
+          chmod +x $TEST_WRAPPERS/$test
+        done
+
+    - name: Test
+      run: |
+        (cd core-tests && tasty-core-tests)
+        core-tests/exit-status-tests.sh
+        core-tests/failing-pattern-test.sh

cabal.project

@@ -5,3 +5,12 @@ packages:
   quickcheck
   smallcheck
 
+if os(wasi)
+  -- https://github.com/haskellari/splitmix/pull/73
+  source-repository-package
+    type: git
+    location: https://github.com/amesgen/splitmix
+    tag: 9c307e1bb4a84ef838b90e739990a616411e2d81
+  package splitmix
+    tests: False
+    benchmarks: False

core-tests/core-tests.cabal

@@ -1,6 +1,4 @@
--- Initial core-tests.cabal generated by cabal init.  For further
--- documentation, see http://haskell.org/cabal/users-guide/
-
+cabal-version:       2.2
 name:                core-tests
 version:             0.1
 synopsis:            Tests for tasty
@@ -13,37 +11,42 @@ maintainer:          roma@ro-che.info
 category:            Testing
 build-type:          Simple
 -- extra-source-files:
-cabal-version:       >=1.10
+
+common commons
+  default-language:    Haskell2010
+  if !os(wasi)
+    -- WASM backend does not yet support the threaded runtime
+    ghc-options:       -threaded -with-rtsopts=-N
 
 executable tasty-core-tests
+  import:              commons
   main-is:             test.hs
   other-modules:       Resources, Timeouts, Utils, AWK, Dependencies
   -- other-extensions:
   build-depends:       base >= 4.9 && <= 5, tasty, tasty-hunit, tasty-golden, tasty-quickcheck, containers, stm, mtl,
                        filepath, bytestring, optparse-applicative
   -- hs-source-dirs:
-  default-language:    Haskell2010
   default-extensions:  CPP, NumDecimals
-  ghc-options:         -Wall -fno-warn-type-defaults -threaded -fno-warn-name-shadowing -fno-warn-incomplete-uni-patterns
+  ghc-options:         -Wall -fno-warn-type-defaults -fno-warn-name-shadowing -fno-warn-incomplete-uni-patterns
 
 executable exit-status-test
+  import:              commons
   main-is:             exit-status-test.hs
   build-depends:       base <= 5, tasty, tasty-hunit,
                        random, random-shuffle
-  default-language:    Haskell2010
   default-extensions:  CPP
-  ghc-options:         -Wall -fno-warn-type-defaults -threaded -with-rtsopts=-N
+  ghc-options:         -Wall -fno-warn-type-defaults
 
 executable resource-release-test
+  import:              commons
   main-is:             resource-release-test.hs
   build-depends:       base <= 5, tasty, tasty-hunit
-  default-language:    Haskell2010
   default-extensions:  CPP
-  ghc-options:         -Wall -fno-warn-type-defaults -threaded -with-rtsopts=-N
+  ghc-options:         -Wall -fno-warn-type-defaults
 
 executable failing-pattern-test
+  import:              commons
   main-is:             failing-pattern-test.hs
   build-depends:       base <= 5, tasty, tasty-hunit, random >= 1.2, mtl
-  default-language:    Haskell2010
   default-extensions:  ScopedTypeVariables
-  ghc-options:         -Wall -fno-warn-type-defaults -threaded -with-rtsopts=-N
+  ghc-options:         -Wall -fno-warn-type-defaults

core/Test/Tasty/Runners/Utils.hs

@@ -18,12 +18,16 @@ import GHC.Clock (getMonotonicTime)
 import Data.Time.Clock.POSIX (getPOSIXTime)
 #endif
 
--- Install handlers only on UNIX
 #ifdef VERSION_unix
+#include "HsUnixConfig.h"
+#ifdef HAVE_SIGNAL_H
 #define INSTALL_HANDLERS 1
 #else
 #define INSTALL_HANDLERS 0
 #endif
+#else
+#define INSTALL_HANDLERS 0
+#endif
 
 #if INSTALL_HANDLERS
 import System.Posix.Signals
@@ -69,8 +73,7 @@ forceElements = foldr seq ()
 -- functions. You only need to call it explicitly if you call
 -- 'Test.Tasty.Runners.tryIngredients' yourself.
 --
--- This function does nothing on non-UNIX systems or when compiled with GHC
--- older than 7.6.
+-- This function does nothing when POSIX signals are not supported.
 --
 -- @since 1.2.1
 installSignalHandlers :: IO ()