initial wasm support

.patch/openssl-cmake/0005-wasm-support.patch

@@ -0,0 +1,55 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1ca57e1..d38c0c6 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -113,9 +113,10 @@ elseif(MINGW)
+     find_program(MAKE mingw32-make REQUIRED)
+     set(OPENSSL_BUILD_TOOL ${MAKE})
+ else()
+-    find_program(MAKE make REQUIRED)
++    find_program(MAKE gmake REQUIRED)
+     set(OPENSSL_BUILD_TOOL ${MAKE})
+ endif()
++set(OPENSSL_BUILD_TOOL gmake)
+ 
+ # Modify configure/build options
+ if(OPENSSL_TEST AND NOT CMAKE_CROSSCOMPILING)
+@@ -140,7 +141,7 @@ if(NUMBER_OF_THREADS GREATER 1)
+         list(APPEND OPENSSL_CONFIGURE_OPTIONS /FS)
+         list(APPEND OPENSSL_BUILD_OPTIONS /J ${NUMBER_OF_THREADS})
+     else()
+-        list(APPEND OPENSSL_BUILD_OPTIONS -j ${NUMBER_OF_THREADS})
++#        list(APPEND OPENSSL_BUILD_OPTIONS -j ${NUMBER_OF_THREADS})
+     endif()
+ endif()
+ 
+diff --git a/cmake/ConfigureOpenSSL.cmake b/cmake/ConfigureOpenSSL.cmake
+index 3012e05..9862aa0 100644
+--- a/cmake/ConfigureOpenSSL.cmake
++++ b/cmake/ConfigureOpenSSL.cmake
+@@ -134,10 +134,24 @@ function(configure_openssl)
+         set(VERBOSE_OPTION OUTPUT_QUIET)
+     endif()
+ 
++    if (CMAKE_SYSTEM_NAME MATCHES "Emscripten")
++        set(EMSCRIPTEN_CMAKE_WRAPPER "emcmake")
++        find_program(EMCC emcc REQUIRED)
++        set(EMSCRIPTEN_LINKER ${EMCC})
++        list(APPEND CONFIGURE_COMMAND wasm64)
++    else()
++        set(EMSCRIPTEN_CMAKE_WRAPPER "")
++        set(EMSCRIPTEN_LINKER ${CMAKE_LINKER})
++    endif ()
++
+     execute_process(
+-        COMMAND ${CMAKE_COMMAND} -E env
++        COMMAND ${EMSCRIPTEN_CMAKE_WRAPPER} ${CMAKE_COMMAND} -E env
+             "CFLAGS=${CMAKE_C_FLAGS}"
+             "CXXFLAGS=${CMAKE_CXX_FLAGS}"
++            "LDFLAGS=${CMAKE_CXX_LINKER_FLAGS}"
++            "CC=${CMAKE_C_COMPILER}"
++            "CXX=${CMAKE_CXX_COMPILER}"
++            "LD=${EMSCRIPTEN_LINKER}"
+             ${CONFIGURE_COMMAND}
+         WORKING_DIRECTORY ${CONFIGURE_BUILD_DIR}
+         ${VERBOSE_OPTION}