Another fix attempt for the CMake build from the root directory of Boost (#209)

Fixes #206

Author: apolukhin

.github/workflows/ci.yml

@@ -51,11 +51,6 @@ jobs:
             cxxstd: "20,23"
             os: ubuntu-24.04
             install: clang-19 llvm-19 libclang-rt-19-dev libc++-19-dev libc++abi-19-dev clang-tools-19
-          # - toolset: clang
-          #   cxxstd: "03,11,14,17,2a"
-          #   os: macos-10.15
-          #   cxxflags: "cxxflags=-fsanitize=address,undefined -fno-sanitize-recover=undefined"
-          #   linkflags: "linkflags=-fsanitize=address,undefined"
 
     runs-on: ${{matrix.os}}
 
@@ -110,7 +105,7 @@ jobs:
           cd ../boost-root/libs/pfr
           mkdir build_module
           cd build_module
-          cmake -DBUILD_TESTING=1 -DBOOST_USE_MODULES=1 -DCMAKE_CXX_COMPILER=clang++-19 -DCMAKE_CXX_FLAGS=-stdlib=libc++ -DCMAKE_EXE_LINKER_FLAGS=-stdlib=libc++ -DCMAKE_CXX_STANDARD=23 -DCMAKE_EXPERIMENTAL_CXX_IMPORT_STD=0e5b6991-d74f-4b3d-a41c-cf096e0b2508 -G Ninja ..
+          cmake -DBUILD_TESTING=1 -DBOOST_USE_MODULES=1 -DCMAKE_CXX_COMPILER=clang++-19 -DCMAKE_CXX_FLAGS=-stdlib=libc++ -DCMAKE_EXE_LINKER_FLAGS=-stdlib=libc++ -DCMAKE_CXX_STANDARD=23 -DCMAKE_EXPERIMENTAL_CXX_IMPORT_STD=0e5b6991-d74f-4b3d-a41c-cf096e0b2508 -G Ninja ../test/cmake_subdir_test
           cmake --build .
           ctest -V
           cd ..
@@ -122,7 +117,7 @@ jobs:
           cd ../boost-root/libs/pfr
           mkdir build_module
           cd build_module
-          cmake -DBOOST_USE_MODULES=1 -DBUILD_TESTING=1 -GNinja -DCMAKE_CXX_COMPILER=clang++-19 ..
+          cmake -DBOOST_USE_MODULES=1 -DBUILD_TESTING=1 -GNinja -DCMAKE_CXX_COMPILER=clang++-19 ../test/cmake_subdir_test
           cmake --build .
           ctest -V
           cd ..
@@ -243,7 +238,7 @@ jobs:
           cd ../boost-root/libs/pfr
           mkdir build_module
           cd build_module
-          cmake -DBOOST_USE_MODULES=1 -DBUILD_TESTING=1 -DCMAKE_CXX_STANDARD=23 -DCMAKE_EXPERIMENTAL_CXX_IMPORT_STD=0e5b6991-d74f-4b3d-a41c-cf096e0b2508 -G Ninja ..
+          cmake -DBOOST_USE_MODULES=1 -DBUILD_TESTING=1 -DCMAKE_CXX_STANDARD=23 -DCMAKE_EXPERIMENTAL_CXX_IMPORT_STD=0e5b6991-d74f-4b3d-a41c-cf096e0b2508 -G Ninja ../test/cmake_subdir_test
           cmake --build .
           ctest --no-tests=error -V
           cd ..
@@ -258,7 +253,7 @@ jobs:
           cd ../boost-root/libs/pfr
           mkdir build_module
           cd build_module
-          cmake -DBOOST_USE_MODULES=1 -DBUILD_TESTING=1 -DCMAKE_CXX_STANDARD=20 -G Ninja ..
+          cmake -DBOOST_USE_MODULES=1 -DBUILD_TESTING=1 -DCMAKE_CXX_STANDARD=20 -G Ninja ../test/cmake_subdir_test
           cmake --build .
           ctest --no-tests=error -V
           cd ..

test/CMakeLists.txt

@@ -10,7 +10,7 @@ file(GLOB CORE_RUN_FILES "core/run/*.cpp")
 foreach (testsourcefile ${CORE_RUN_FILES})
     get_filename_component(testname ${testsourcefile} NAME_WLE)
     add_executable(pfr_core_${testname} ${testsourcefile})
-    target_link_libraries(pfr_core_${testname} Boost::pfr)
+    target_link_libraries(pfr_core_${testname} Boost::pfr Boost::core)
     target_include_directories(pfr_core_${testname} PRIVATE ../../../)
     add_test(NAME pfr_core_${testname} COMMAND pfr_core_${testname})
     add_dependencies(tests pfr_core_${testname})
@@ -21,7 +21,7 @@ foreach (testsourcefile ${CORE_NAME_RUN_FILES})
     get_filename_component(testname ${testsourcefile} NAME_WLE)
     add_executable(pfr_corename_${testname} ${testsourcefile})
     target_compile_features(pfr_corename_${testname} PUBLIC cxx_std_20)
-    target_link_libraries(pfr_corename_${testname} Boost::pfr)
+    target_link_libraries(pfr_corename_${testname} Boost::pfr Boost::core)
     target_include_directories(pfr_corename_${testname} PRIVATE ../../../)
     add_test(NAME pfr_corename_${testname} COMMAND pfr_corename_${testname})
     add_dependencies(tests pfr_corename_${testname})

test/cmake_subdir_test/CMakeLists.txt

@@ -0,0 +1,15 @@
+# Copyright  (c) 2016-2025 Antony Polukhin
+# Distributed under the Boost Software License, Version 1.0.
+# See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
+
+cmake_minimum_required(VERSION 3.5...4.0)
+
+project(pfr_subdir_test LANGUAGES CXX)
+
+add_subdirectory(../../../assert boostorg/assert)
+add_subdirectory(../../../core boostorg/core)
+add_subdirectory(../../../config boostorg/config)
+add_subdirectory(../../../static_assert boostorg/static_assert)
+add_subdirectory(../../../throw_exception boostorg/throw_exception)
+
+add_subdirectory(../../ boostorg/pfr)