[boost] fix emscripten build (#29481)

* Update CMakeLists.txt

* print lib prefix and suffix

* set extension to bc

* wip: wasm .bc copy workaround

* hack wasm32 boost libs copy

* rename bc to a

* remove status messages

* update port ver

* run addver cmd

ports/boost-modular-build-helper/CMakeLists.txt

@@ -44,6 +44,8 @@ elseif(VCPKG_TARGET_ARCHITECTURE MATCHES "mips64")
     list(APPEND B2_OPTIONS architecture=mips64)
 elseif("arm64" IN_LIST VCPKG_TARGET_ARCHITECTURE AND "x86_64" IN_LIST VCPKG_TARGET_ARCHITECTURE)
     list(APPEND B2_OPTIONS architecture=arm+x86)
+elseif(VCPKG_TARGET_ARCHITECTURE STREQUAL "wasm32")
+    # do nothing
 else()
     list(APPEND B2_OPTIONS architecture=x86)
 endif()
@@ -63,6 +65,8 @@ if(VCPKG_DETECTED_MSVC)
     else()
         math(EXPR USER_CONFIG_TOOLSET_VERSION "${VCPKG_DETECTED_MSVC_VERSION} / 10 - 50")
     endif()
+elseif(VCPKG_TARGET_ARCHITECTURE STREQUAL "wasm32")
+    set(USER_CONFIG_TOOLSET emscripten)
 elseif(VCPKG_DETECTED_CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     set(USER_CONFIG_TOOLSET clang)
 else()

ports/boost-modular-build-helper/boost-modular-build.cmake

@@ -53,7 +53,10 @@ function(boost_modular_build)
         endif()
     else()
         set(BOOST_LIB_PREFIX lib)
-        if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
+        if(VCPKG_TARGET_ARCHITECTURE STREQUAL "wasm32")
+            set(BOOST_LIB_RELEASE_SUFFIX .bc)
+            set(BOOST_LIB_DEBUG_SUFFIX .bc)
+        elseif(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
             set(BOOST_LIB_RELEASE_SUFFIX .a)
             set(BOOST_LIB_DEBUG_SUFFIX .a)
         elseif(VCPKG_CMAKE_SYSTEM_NAME STREQUAL "Darwin")
@@ -144,6 +147,30 @@ function(boost_modular_build)
             "${CURRENT_PACKAGES_DIR}/debug/bin/*.pyd"
     )
 
+    if(VCPKG_TARGET_ARCHITECTURE STREQUAL "wasm32")
+        # install .bc files
+        file(GLOB WASM_LIBS_RELEASE "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/boost/build/*/${BOOST_LIB_PREFIX}*${BOOST_LIB_RELEASE_SUFFIX}")
+        file(GLOB WASM_LIBS_DEBUG "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg/boost/build/*/${BOOST_LIB_PREFIX}*${BOOST_LIB_DEBUG_SUFFIX}")
+        file(COPY ${WASM_LIBS_RELEASE} DESTINATION "${CURRENT_PACKAGES_DIR}/lib")
+        file(COPY ${WASM_LIBS_DEBUG} DESTINATION "${CURRENT_PACKAGES_DIR}/debug/lib")
+
+        # rename .bc to .a
+        file(GLOB WASM_LIBS_RELEASE "${CURRENT_PACKAGES_DIR}/lib/*.bc")
+        file(GLOB WASM_LIBS_DEBUG "${CURRENT_PACKAGES_DIR}/debug/lib/*.bc")
+        foreach(LIB IN LISTS WASM_LIBS_RELEASE)
+            get_filename_component(OLD_FILENAME ${LIB} NAME)
+            get_filename_component(DIRECTORY_OF_LIB_FILE ${LIB} DIRECTORY)
+            string(REPLACE ".bc" ".a" NEW_FILENAME ${OLD_FILENAME})
+            file(RENAME ${LIB} ${DIRECTORY_OF_LIB_FILE}/${NEW_FILENAME})
+        endforeach()
+        foreach(LIB IN LISTS WASM_LIBS_DEBUG)
+            get_filename_component(OLD_FILENAME ${LIB} NAME)
+            get_filename_component(DIRECTORY_OF_LIB_FILE ${LIB} DIRECTORY)
+            string(REPLACE ".bc" ".a" NEW_FILENAME ${OLD_FILENAME})
+            file(RENAME ${LIB} ${DIRECTORY_OF_LIB_FILE}/${NEW_FILENAME})
+        endforeach()
+    endif()
+
     file(GLOB INSTALLED_LIBS "${CURRENT_PACKAGES_DIR}/debug/lib/*.lib" "${CURRENT_PACKAGES_DIR}/lib/*.lib")
     foreach(LIB IN LISTS INSTALLED_LIBS)
         get_filename_component(OLD_FILENAME ${LIB} NAME)

ports/boost-modular-build-helper/vcpkg.json

@@ -2,7 +2,7 @@
   "$comment": "Automatically generated by scripts/boost/generate-ports.ps1",
   "name": "boost-modular-build-helper",
   "version": "1.81.0",
-  "port-version": 1,
+  "port-version": 2,
   "description": "Internal vcpkg port used to build Boost libraries",
   "license": "MIT",
   "dependencies": [

versions/b-/boost-modular-build-helper.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "99f9bc3d7c9ac2864942f3f8d80a3d8db4689794",
+      "version": "1.81.0",
+      "port-version": 2
+    },
     {
       "git-tree": "6e28e9a445dc3442e89761e500fbb8bb5e175c00",
       "version": "1.81.0",

versions/baseline.json

@@ -894,7 +894,7 @@
     },
     "boost-modular-build-helper": {
       "baseline": "1.81.0",
-      "port-version": 1
+      "port-version": 2
     },
     "boost-move": {
       "baseline": "1.81.0",