Core: Add libfmt via FetchContent

CMakeLists.txt

@@ -42,6 +42,7 @@ InitializeFreeCADBuildOptions()
 CheckInterModuleDependencies()
 FreeCADLibpackChecks()
 SetupDoxygen()
+SetupLibFmt()
 if(NOT FREECAD_LIBPACK_USE OR FREECAD_LIBPACK_CHECKFILE_CLBUNDLER)
     SetupPython()
     SetupPCL()

cMake/FreeCAD_Helpers/PrintFinalReport.cmake

@@ -178,6 +178,7 @@ macro(PrintFinalReport)
     conditional(Doxygen DOXYGEN_FOUND "not found" "${DOXYGEN_VERSION} Language: ${DOXYGEN_LANGUAGE}")
     conditional(Coin3D_DOC COIN3D_DOC_FOUND "not found" ${COIN3D_DOC_PATH})
     conditional(PYCXX ${PYCXX_FOUND} "not found" "${PYCXX_VERSION} Incl: ${PYCXX_INCLUDE_DIR} Src:${PYCXX_SOURCE_DIR}")
+    conditional(fmt ${fmt_FOUND} "${fmt_VERSION}" "Source located in ${fmt_SOURCE_DIR}")
 
     section_end()
 

cMake/FreeCAD_Helpers/SetupLibFmt.cmake

@@ -0,0 +1,39 @@
+macro(SetupLibFmt)
+
+       # This internet check idea is borrowed from:
+       # https://stackoverflow.com/questions/62214621/how-to-check-for-internet-connection-with-cmake-automatically-prevent-fails-if
+
+       message(STATUS "Checking for connection to GitHub...")
+       if (WIN32)
+              set(ping_command "ping /n 1 /w 1000 github.com")
+       else()
+              set(ping_command "ping -c 1 -W 1000 github.com")
+       endif()
+       execute_process(
+              COMMAND ${ping_command}
+              RESULT_VARIABLE NO_CONNECTION
+       )
+       if(NO_CONNECTION GREATER 0)
+              set(FETCHCONTENT_UPDATES_DISCONNECTED ON)
+              message(WARNING "NO INTERNET CONNECTION: Using disconnected mode for FetchContent updates")
+       else()
+              message(STATUS "GitHub connection established for FetchContent")
+              set(FETCHCONTENT_UPDATES_DISCONNECTED OFF)
+       endif()
+
+       include(FetchContent)
+       FetchContent_Declare(fmt
+              GIT_REPOSITORY https://github.com/fmtlib/fmt
+              GIT_TAG 9.1.0
+       )
+       FetchContent_MakeAvailable(fmt)
+       set_target_properties(fmt PROPERTIES POSITION_INDEPENDENT_CODE ON)
+       if (${fmt_FOUND})
+              message(STATUS "find_package() was used to locate the fmt version ${fmt_VERSION}")
+       elseif(${fmt_POPULATED})
+              message(STATUS "fmt was downloaded using FetchContent into ${fmt_SOURCE_DIR}")
+       else()
+              message(ERROR "Failed to install the fmt library")
+       endif()
+
+endmacro()

src/App/CMakeLists.txt

@@ -65,6 +65,7 @@ include_directories(
 set(FreeCADApp_LIBS
     FreeCADBase
     ${Boost_LIBRARIES}
+    fmt::fmt
 )
 
 include_directories(