use fmt as an own dependency instead of the one included by spdlog.

This should make it possible to decouple the formating and logging in nautilus.

CMakeLists.txt

@@ -5,6 +5,7 @@ option(ENABLE_LOGGING "Enable logging support" ON)
 option(ENABLE_STACKTRACE "Enable stacktrace support" ON)
 option(ENABLE_TESTS "Enable tests" ON)
 option(ENABLE_COMPILER "Enables tracing and backend compilers" ON)
+option(USE_EXTERNAL_FMT "Use a externally provided version of fmt" OFF)
 option(USE_EXTERNAL_SPDLOG "Use a externally provided version of spdlog" OFF)
 option(USE_EXTERNAL_MLIR "Use a externally provided version of MLIR" OFF)
 cmake_dependent_option(ENABLE_TRACING "Enable the tracing" ON "ENABLE_COMPILER" OFF)
@@ -66,17 +67,26 @@ if (ENABLE_TESTS)
     list(APPEND EXPORT_TARGETS Catch2)
 endif ()
 
+if (USE_EXTERNAL_FMT)
+    find_package(fmt CONFIG REQUIRED)
+else ()
+    add_subdirectory(${THIRD_PARTY_DIR}/fmt EXCLUDE_FROM_ALL)
+    list(APPEND EXPORT_TARGETS fmt)
+endif ()
+
 if (ENABLE_LOGGING)
     if (USE_EXTERNAL_SPDLOG)
         find_package(spdlog CONFIG REQUIRED)
     else ()
         set(SPDLOG_COMPILED_LIB ON)
         set(SPDLOG_BUILD_SHARED OFF)
+        set(SPDLOG_FMT_EXTERNAL ON)
         add_subdirectory(${THIRD_PARTY_DIR}/spdlog)
         list(APPEND EXPORT_TARGETS spdlog)
     endif ()
 endif ()
 
+
 if (ENABLE_STACKTRACE)
     # Also requires one of: libbfd (gnu binutils), libdwarf, libdw (elfutils)
     add_subdirectory(${THIRD_PARTY_DIR}/backward-cpp)

nautilus/CMakeLists.txt

@@ -32,6 +32,9 @@ set_target_properties(nautilus PROPERTIES
         EXPORT_NAME nautilus
 )
 
+disable_target_warnings(fmt)
+target_link_libraries(nautilus PRIVATE fmt::fmt)
+
 if (ENABLE_LOGGING)
     target_link_libraries(nautilus PRIVATE spdlog::spdlog)
 endif ()
@@ -54,6 +57,7 @@ install(
         TARGETS nautilus ${EXPORT_TARGETS}
         EXPORT ${PROJECT_NAME}-config
         ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/
 )
 
 install(

third_party/CMakeLists.txt

@@ -8,9 +8,13 @@ endif ()
 if (ENABLE_LOGGING)
     set(SPDLOG_COMPILED_LIB ON)
     set(SPDLOG_BUILD_SHARED OFF)
+    set(SPDLOG_FMT_EXTERNAL ON)
     add_subdirectory(spdlog)
 endif ()
 
+add_subdirectory(fmt)
+disable_target_warnings(fmt)
+
 if (ENABLE_STACKTRACE)
     # Also requires one of: libbfd (gnu binutils), libdwarf, libdw (elfutils)
     add_subdirectory(backward-cpp)