cmake: remove use of -H for -S

.github/workflows/build.yml

@@ -63,7 +63,7 @@ jobs:
       - name: Configure CMake
         run: |
           export CXX='${{ matrix.config.compiler_invocation }}'
-          cmake -H. -Bbuild \
+          cmake -S . -B build \
             -DCMAKE_INSTALL_PREFIX=install \
             -DREAPER_DEBUG_BUILD=${{ matrix.cmake_build_type == 'Debug' && 'ON' || 'OFF'}} \
             -DBUILD_SHARED_LIBS=${{ matrix.cmake_build_shared_libs }} \
@@ -129,7 +129,7 @@ jobs:
 
       - name: Configure CMake
         run: |
-          cmake .\ -Bbuild `
+          cmake -S . -B build `
             -G "${{ matrix.cmake_generator }}" `
             -A "${{ matrix.cmake_arch }}" `
             -DCMAKE_INSTALL_PREFIX=install `

CMakeLists.txt

@@ -11,14 +11,6 @@
 
 cmake_minimum_required(VERSION 3.21 FATAL_ERROR)
 
-# Avoid source tree pollution
-if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
-    message(FATAL_ERROR
-        " In-source builds are discouraged. Tell CMake to use a separate folder:\n"
-        " $ rm -rf CMakeCache.txt CMakeFiles\n"
-        " $ cmake -H. -Bbuild")
-endif()
-
 # You can choose the build type here, and a build directory will only support either Debug or Release.
 option(REAPER_DEBUG_BUILD "Debug build" ON)
 

README.md

@@ -6,6 +6,6 @@ Reaper is a small C++ test engine.
 
 ```sh
 $ git submodule update --init
-$ cmake -H. -B./build
+$ cmake -S . -B build
 $ cmake --build build
 ```