Re: [fltk/fltk] Missing symbols when building with MSVC 2022 and CMAKE_BUILD_TYPE to RelWithDebInfo (Issue #960)

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Re: [fltk/fltk] Missing symbols when building with MSVC 2022 and CMAKE_BUILD_TYPE to RelWithDebInfo (Issue #960) Albrecht Schlosser Apr 27, 2024

@ggarra13 Can you please try the patch below? This should define the macro FL_DLL in MSVC (Visual Studio) projects that link to the shared FLTK library.

diff --git a/CMake/fl_add_library.cmake b/CMake/fl_add_library.cmake
index ebf9e28c0..c4e5f91c4 100644
--- a/CMake/fl_add_library.cmake
+++ b/CMake/fl_add_library.cmake
@@ -197,7 +197,7 @@ function(fl_add_library LIBNAME LIBTYPE SOURCES)
         OUTPUT_NAME_DEBUG   ${LIBNAME}_dlld
         OUTPUT_NAME_RELEASE ${LIBNAME}_dll
       )
-      target_compile_definitions(${TARGET_NAME} PRIVATE FL_DLL)
+      target_compile_definitions(${TARGET_NAME} PUBLIC FL_DLL)
     endif(MSVC)
   endif(LIBTYPE STREQUAL "SHARED")

Please let me know if this fixes the issue for your (example) project. Note that I'm not going to build your project myself (it's too large for me to check the details for such a tiny issue).

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