Fix emulated arch CI: use CMAKE_PROJECT_INCLUDE to pass arch define

Use a temporary .cmake file with add_compile_definitions to pass
XSIMD_DEFAULT_ARCH=emulated<N> without shell angle-bracket redirection.
Revert CMakeLists.txt to its original state (no XSIMD_EMULATED_SIZE option).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: AntoinePrv

.github/workflows/emulated.yml

@@ -27,6 +27,11 @@ jobs:
       if: ${{ matrix.sys.compiler == 'g++' }}
       run: |
         echo "CXXFLAGS=-Wno-noexcept-type -Wno-stringop-overflow -Wno-maybe-uninitialized" >> $GITHUB_ENV
+    - name: Set emulated arch
+      run: |
+        SIZE="${{ matrix.sys.size }}"
+        echo "add_compile_definitions(\"XSIMD_DEFAULT_ARCH=emulated<${SIZE}>\")" >  /tmp/emulated.cmake
+        echo "add_compile_definitions(XSIMD_WITH_EMULATED=1)"                    >> /tmp/emulated.cmake
     - name: Configure build
       run: |
         cmake -B_build \
@@ -36,7 +41,7 @@ jobs:
           -DCMAKE_BUILD_TYPE=Release \
           -DCMAKE_CXX_COMPILER=${{ matrix.sys.compiler }} \
           -DXSIMD_ENABLE_WERROR=ON \
-          -DXSIMD_EMULATED_SIZE=${{ matrix.sys.size }} \
+          -DCMAKE_PROJECT_INCLUDE=/tmp/emulated.cmake \
           -DCMAKE_CXX_FLAGS="$CXXFLAGS" \
           -GNinja
     - name: Build

CMakeLists.txt

@@ -93,12 +93,6 @@ target_include_directories(xsimd INTERFACE
 OPTION(ENABLE_XTL_COMPLEX "enables support for xcomplex defined in xtl" OFF)
 OPTION(BUILD_TESTS "xsimd test suite" OFF)
 
-set(XSIMD_EMULATED_SIZE "" CACHE STRING "If set, compile with emulated<N> as the default arch (N = register size in bits)")
-if(XSIMD_EMULATED_SIZE)
-    add_compile_definitions("XSIMD_DEFAULT_ARCH=emulated<${XSIMD_EMULATED_SIZE}>")
-    add_compile_definitions(XSIMD_WITH_EMULATED=1)
-endif()
-
 if(ENABLE_XTL_COMPLEX)
     find_package(xtl 0.8.0 REQUIRED)
     target_compile_features(xsimd INTERFACE cxx_std_14)