Test emmalloc in CI (WebAssembly#683)

Currently we don't even test that it builds, so this adds it both to run
the normal tests but additionally with Python as well. I found that if
`-fno-strict-aliasing` was left out it would crash Python, so this is
hopefully a pretty comprehensive test.

Author: alexcrichton

.github/workflows/main.yml

@@ -142,6 +142,14 @@ jobs:
               THREAD_MODEL: posix
               DEBUG: true
 
+          - name: Test emmalloc
+            os: ubuntu-24.04
+            clang_version: 19
+            test: true
+            env:
+              TARGET_TRIPLE: wasm32-wasip1
+              MALLOC_IMPL: emmalloc
+
     steps:
     - uses: actions/[email protected]
       with:
@@ -169,7 +177,8 @@ jobs:
         cmake -S test -B testbuild -G Ninja \
           -DTARGET_TRIPLE=${{ env.TARGET_TRIPLE }} \
           -DENGINE=${{ env.ENGINE }} \
-          -DCMAKE_LINK_DEPENDS_USE_LINKER=OFF
+          -DCMAKE_LINK_DEPENDS_USE_LINKER=OFF \
+          -DMALLOC_IMPL=${{ env.MALLOC_IMPL }}
 
     - name: Build tests
       if: matrix.test
@@ -256,6 +265,9 @@ jobs:
           - env:
               TARGET_TRIPLE: wasm32-wasip2
               WASI_SNAPSHOT: p2
+          - env:
+              TARGET_TRIPLE: wasm32-wasip1
+              MALLOC_IMPL: emmalloc
     steps:
     - uses: actions/[email protected]
       with:

test/CMakeLists.txt

@@ -15,6 +15,7 @@ include(CTest)
 enable_testing()
 
 set(TARGET_TRIPLE "wasm32-wasi" CACHE STRING "WASI target to test")
+set(MALLOC_IMPL "" CACHE STRING "Malloc implementation in use")
 option(PYTHON_TESTS "Build Python with this wasi-libc and run its tests" OFF)
 
 # ========= Sysroot sanity check ================================
@@ -234,6 +235,9 @@ add_libc_test(functional/memstream.c)
 add_libc_test(functional/qsort.c)
 add_libc_test(functional/random.c)
 add_libc_test(functional/search_hsearch.c)
+if (MALLOC_IMPL STREQUAL "emmalloc")
+  set_tests_properties(libc_test_functional_search_hsearch.wasm PROPERTIES WILL_FAIL TRUE)
+endif()
 add_libc_test(functional/search_insque.c)
 add_libc_test(functional/search_lsearch.c)
 add_libc_test(functional/search_tsearch.c)