Don't link fmt-header-only directly when building a static lib

CMakeLists.txt

@@ -1371,7 +1371,16 @@ add_custom_target(clang-tidy-check ${CLANG_TIDY_EXECUTABLE} -format-style=file -
 if(LIBTYPE STREQUAL "STATIC")
     add_library(${IMPL_TARGET} STATIC ${COMMON_OBJS} ${OPENAL_OBJS} ${ALC_OBJS} ${CORE_OBJS})
     target_compile_definitions(${IMPL_TARGET} PUBLIC AL_LIBTYPE_STATIC)
-    target_link_libraries(${IMPL_TARGET} PRIVATE ${LINKER_FLAGS} ${EXTRA_LIBS} ${MATH_LIB} alsoft::fmt-header-only)
+    # Instead of "linking" with the fmt-header-only interface target, which
+    # puts an unwanted dependency on the target when exporting/installing, just
+    # copy the properties.
+    target_compile_definitions(${IMPL_TARGET} PRIVATE
+        $<TARGET_PROPERTY:alsoft::fmt-header-only,INTERFACE_COMPILE_DEFINITIONS>)
+    target_include_directories(${IMPL_TARGET} PRIVATE
+        $<TARGET_PROPERTY:alsoft::fmt-header-only,INTERFACE_INCLUDE_DIRECTORIES>)
+    target_compile_options(${IMPL_TARGET} PRIVATE
+        $<TARGET_PROPERTY:alsoft::fmt-header-only,INTERFACE_COMPILE_OPTIONS>)
+    target_link_libraries(${IMPL_TARGET} PRIVATE ${LINKER_FLAGS} ${EXTRA_LIBS} ${MATH_LIB})
 
     if(WIN32)
         # This option is for static linking OpenAL Soft into another project

fmt-11.0.2/CMakeLists.txt

@@ -94,10 +94,6 @@ set_target_properties(alsoft.fmt PROPERTIES ${ALSOFT_STD_VERSION_PROPS}
   COMPILE_PDB_NAME "fmt"
   COMPILE_PDB_NAME_DEBUG "fmt${ALSOFT_FMT_DEBUG_POSTFIX}")
 
-if (BUILD_SHARED_LIBS)
-  target_compile_definitions(alsoft.fmt PRIVATE FMT_LIB_EXPORT INTERFACE FMT_SHARED)
-endif ()
-
 add_library(alsoft.fmt-header-only INTERFACE)
 add_library(alsoft::fmt-header-only ALIAS alsoft.fmt-header-only)