Build FoundationMacros as external CMake project

swiftlang/swift-foundation#849

Author: kateinoigakukun

schemes/main/build/build-foundation.sh

@@ -13,6 +13,7 @@ BUILD_SDK_PATH="$SOURCE_PATH/build-sdk"
 LIBXML2_PATH="$BUILD_SDK_PATH/libxml2-$TRIPLE"
 
 FOUNDATION_BUILD="$SOURCE_PATH/build/WebAssembly/foundation-$TRIPLE"
+FOUNDATION_MACROS_BUILD="$SOURCE_PATH/build/WebAssembly/foundation-macros-$TRIPLE"
 
 swift_extra_flags=""
 c_extra_flags=""
@@ -21,6 +22,16 @@ if [[ "$TRIPLE" == "wasm32-unknown-wasip1-threads" ]]; then
   c_extra_flags="-mthread-model posix -pthread -ftls-model=local-exec"
 fi
 
+cmake -G Ninja \
+  -D CMAKE_C_COMPILER="$CLANG_BIN_DIR/clang" \
+  -D CMAKE_CXX_COMPILER="$CLANG_BIN_DIR/clang++" \
+  -D CMAKE_Swift_COMPILER="$SWIFT_BIN_DIR/swiftc" \
+  -D BUILD_SHARED_LIBS=ON \
+  -B "$FOUNDATION_MACROS_BUILD" \
+  "${SOURCE_PATH}/swift-foundation/Sources/FoundationMacros"
+
+cmake --build "$FOUNDATION_MACROS_BUILD"
+
 cmake -G Ninja \
   -D CMAKE_BUILD_TYPE="Release" \
   -D CMAKE_SYSROOT="$WASI_SYSROOT_PATH" \
@@ -47,6 +58,7 @@ cmake -G Ninja \
   -D _SwiftCollections_SourceDIR="$SOURCE_PATH/swift-collections" \
   -D _SwiftFoundation_SourceDIR="$SOURCE_PATH/swift-foundation" \
   -D _SwiftFoundationICU_SourceDIR="$SOURCE_PATH/swift-foundation-icu" \
+  -D SwiftFoundation_MACRO="$FOUNDATION_MACROS_BUILD/lib" \
   -B "$FOUNDATION_BUILD" \
   "${SOURCE_PATH}/swift-corelibs-foundation"