Fix OpenSSL dependency in CMake (#2447)

.github/workflows/build.yml

@@ -80,7 +80,7 @@ jobs:
         docker exec emscripten emcc -v
         docker exec emscripten emcmake cmake -B emscripten -DWERROR=ON
         docker exec -w /src/emscripten emscripten make -j $(nproc)
-        
+
   wasi:
     name: wasi
     runs-on: ubuntu-latest
@@ -162,10 +162,35 @@ jobs:
         python -m pip install -U setuptools wheel pip
         python -m pip install "cmake==${WABT_CMAKE_VER}.*"
         cmake --version
-    - name: Configure WABT
+
+    - name: configure (OpenSSL)
       run: cmake -G Ninja -S . -B out -DCMAKE_BUILD_TYPE=Release
-    - name: build
+    - name: build (OpenSSL)
       run: cmake --build out
+    - name: install (OpenSSL)
+      run: cmake --install out --prefix install
+
+    - name: configure (PicoSHA2)
+      run: cmake -G Ninja -S . -B out-picosha -DCMAKE_BUILD_TYPE=Release -DUSE_INTERNAL_SHA256=ON
+    - name: build (PicoSHA2)
+      run: cmake --build out-picosha
+    - name: install (PicoSHA2)
+      run: cmake --install out-picosha --prefix install-picosha
+
+    - name: test CMake package (OpenSSL)
+      run: >
+        ctest --build-and-test scripts/example-project example-openssl
+        --build-generator Ninja
+        --build-options -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=$PWD/install
+        --test-command ctest
+
+    - name: test CMake package (PicoSHA2)
+      run: >
+        ctest --build-and-test scripts/example-project example-picosha
+        --build-generator Ninja
+        --build-options -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=$PWD/install-picosha
+        --test-command ctest
+
     - name: unittests
       run: cmake --build out --target run-unittests
     - name: c-api-tests

scripts/example-project/CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.16)
+project(example CXX)
+
+enable_testing()
+
+find_package(wabt REQUIRED)
+
+add_executable(example example.cpp)
+target_link_libraries(example PRIVATE wabt::wabt)
+
+add_test(NAME example COMMAND example)

scripts/example-project/example.cpp

@@ -0,0 +1,3 @@
+#include <wabt/ir.h>
+
+int main () {}

scripts/wabt-config.cmake.in

@@ -1,5 +1,10 @@
 cmake_minimum_required(VERSION 3.8)
 @PACKAGE_INIT@
 
+if ("@HAVE_OPENSSL_SHA_H@")
+    include(CMakeFindDependencyMacro)
+    find_dependency(OpenSSL)
+endif ()
+
 include("${CMAKE_CURRENT_LIST_DIR}/wabt-targets.cmake")
 check_required_components(wabt)