[FIX] Legacy libraries with shared linkage

.github/workflows/ci.yml

@@ -603,7 +603,7 @@ jobs:
           cmake --build .
           ctest --output-on-failure --no-tests=error
 
-  posix-cmake-install-legacy:
+  posix-cmake-install-legacy-static:
     strategy:
       fail-fast: false
       matrix:
@@ -655,6 +655,58 @@ jobs:
           cmake --build .
           ctest --output-on-failure --no-tests=error
 
+  posix-cmake-install-legacy-shared:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: macos-15
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Boost
+        run: |
+          echo GITHUB_REPOSITORY: $GITHUB_REPOSITORY
+          LIBRARY=${GITHUB_REPOSITORY#*/}
+          echo LIBRARY: $LIBRARY
+          echo "LIBRARY=$LIBRARY" >> $GITHUB_ENV
+          echo GITHUB_BASE_REF: $GITHUB_BASE_REF
+          echo GITHUB_REF: $GITHUB_REF
+          REF=${GITHUB_BASE_REF:-$GITHUB_REF}
+          REF=${REF#refs/heads/}
+          echo REF: $REF
+          BOOST_BRANCH=develop && [ "$REF" == "master" ] && BOOST_BRANCH=master || true
+          echo BOOST_BRANCH: $BOOST_BRANCH
+          cd ..
+          git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
+          cd boost-root
+          mkdir -p libs/$LIBRARY
+          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          git submodule update --init tools/boostdep
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" $LIBRARY
+
+      - name: Configure
+        run: |
+          cd ../boost-root
+          mkdir __build__ && cd __build__
+          cmake -DBOOST_INCLUDE_LIBRARIES=$LIBRARY -DBOOST_MATH_BUILD_WITH_LEGACY_FUNCTIONS=ON -DCMAKE_INSTALL_PREFIX=~/.local -DBUILD_SHARED_LIBS=ON ..
+
+      - name: Install
+        run: |
+          cd ../boost-root/__build__
+          cmake --build . --target install
+
+      - name: Use the installed library (legacy compiled)
+        run: |
+          cd ../boost-root/libs/$LIBRARY/test/cmake_install_test_legacy
+          mkdir __build__ && cd __build__
+          cmake -DCMAKE_INSTALL_PREFIX=~/.local ..
+          cmake --build .
+          ctest --output-on-failure --no-tests=error
+
   sycl-cmake-test:
     strategy:
       fail-fast: false

CMakeLists.txt

@@ -52,11 +52,12 @@ option(BOOST_MATH_BUILD_WITH_LEGACY_FUNCTIONS "Build the C99 and TR1 compiled li
 if(BOOST_MATH_BUILD_WITH_LEGACY_FUNCTIONS)
 
 include(CheckCXXSourceCompiles)
-get_target_property(_config_type Boost::config TYPE)
-if(_config_type STREQUAL "INTERFACE_LIBRARY")
-  get_target_property(_config_inc Boost::config INTERFACE_INCLUDE_DIRECTORIES)
-else()
-  set(_config_inc "")
+set(_config_inc "")
+if(NOT BOOST_MATH_STANDALONE)
+  get_target_property(_config_type Boost::config TYPE)
+  if(_config_type STREQUAL "INTERFACE_LIBRARY")
+    get_target_property(_config_inc Boost::config INTERFACE_INCLUDE_DIRECTORIES)
+  endif()
 endif()
 set(CMAKE_REQUIRED_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/include" ${_config_inc})
 check_cxx_source_compiles("#include <${CMAKE_CURRENT_SOURCE_DIR}/config/has_long_double_support.cpp> \n int main() { return 0;}" BOOST_MATH_HAS_LONG_DOUBLE)
@@ -130,22 +131,29 @@ list(TRANSFORM TR1_SOURCES APPEND ".cpp")
 foreach(type IN LISTS types)
   add_library(boost_math_tr1${type} ${TR1_SOURCES${type}})
   add_library(Boost::math_tr1${type} ALIAS boost_math_tr1${type})
-  target_link_libraries(boost_math_tr1${type} PUBLIC Boost::config)
+  if(NOT BOOST_MATH_STANDALONE)
+    target_link_libraries(boost_math_tr1${type} PUBLIC Boost::config)
+  endif()
   target_include_directories(boost_math_tr1${type} PRIVATE src/tr1)
   target_include_directories(boost_math_tr1${type} PRIVATE include)
 
   add_library(boost_math_c99${type} ${C99_SOURCES${type}})
   add_library(Boost::math_c99${type} ALIAS boost_math_c99${type})
-  target_link_libraries(boost_math_c99${type} PUBLIC Boost::config)
+  if(NOT BOOST_MATH_STANDALONE)
+    target_link_libraries(boost_math_c99${type} PUBLIC Boost::config)
+  endif()
   target_include_directories(boost_math_c99${type} PRIVATE src/tr1)
   target_include_directories(boost_math_c99${type} PRIVATE include)
 
   if(BUILD_SHARED_LIBS)
     target_compile_definitions(boost_math_tr1${type} PUBLIC BOOST_MATH_TR1_DYN_LINK=1)
     target_compile_definitions(boost_math_c99${type} PUBLIC BOOST_MATH_TR1_DYN_LINK=1)
-    if(MSVC)
+    if(WIN32)
       target_compile_definitions(boost_math_tr1${type} PRIVATE "BOOST_SYMBOL_EXPORT=__declspec(dllexport)" BOOST_ALL_NO_LIB)
       target_compile_definitions(boost_math_c99${type} PRIVATE "BOOST_SYMBOL_EXPORT=__declspec(dllexport)" BOOST_ALL_NO_LIB)
+    else()
+      target_compile_definitions(boost_math_tr1${type} PRIVATE "BOOST_SYMBOL_EXPORT=__attribute__((visibility(\"default\")))" BOOST_ALL_NO_LIB)
+      target_compile_definitions(boost_math_c99${type} PRIVATE "BOOST_SYMBOL_EXPORT=__attribute__((visibility(\"default\")))" BOOST_ALL_NO_LIB)
     endif()
   endif()