Bow out of C++17 for now; switch to Boost.

CMakeLists.txt

@@ -7,11 +7,14 @@ if ("${CMAKE_CURRENT_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
     "Hint: mkdir -p build; cmake -H. -Bbuild; make -Cbuild\n")
 endif ()
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 11)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}")
 include(ExternalProject)
 
+include(${CMAKE_BINARY_DIR}/conanbuildinfo_multi.cmake)
+conan_basic_setup(TARGETS)
+
 # FBX
 foreach (FBXSDK_VERSION "2019.2")
   find_package(FBX)
@@ -124,22 +127,6 @@ ExternalProject_Add(CPPCodec
 )
 set(CPPCODEC_INCLUDE_DIR "${CMAKE_BINARY_DIR}/cppcodec/src/CPPCodec")
 
-# FMT
-ExternalProject_Add(Fmt
-  PREFIX fmt
-  GIT_REPOSITORY https://github.com/fmtlib/fmt
-  GIT_TAG 4.0.0
-  CMAKE_CACHE_ARGS  "-DFMT_DOC:BOOL=OFF" "-DFMT_INSTALL:BOOL=ON" "-DFMT_TEST:BOOL=OFF"
-  CMAKE_ARGS
-        -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
-)
-set(FMT_INCLUDE_DIR "${CMAKE_BINARY_DIR}/fmt/include")
-if (WIN32)
-   set(FMT_LIB "${CMAKE_BINARY_DIR}/fmt/lib/fmt.lib")
-else()
-   set(FMT_LIB "${CMAKE_BINARY_DIR}/fmt/lib/libfmt.a")
-endif()
-
 if (APPLE)
     find_library(CF_FRAMEWORK CoreFoundation)
     message("CoreFoundation Framework: ${CF_FRAMEWORK}")
@@ -218,7 +205,6 @@ add_dependencies(libFBX2glTF
   MathFu
   FiFoMap
   CPPCodec
-  Fmt
 )
 
 if (NOT MSVC)
@@ -235,8 +221,10 @@ endif()
 
 target_link_libraries(libFBX2glTF
   ${FRAMEWORKS}
+  CONAN_PKG::boost_filesystem
+  CONAN_PKG::boost_optional
+  CONAN_PKG::fmt
   ${DRACO_LIB}
-  ${FMT_LIB}
   optimized ${FBXSDK_LIBRARY}
   debug ${FBXSDK_LIBRARY_DEBUG}
   ${CMAKE_DL_LIBS}
@@ -260,7 +248,6 @@ else()
   target_link_libraries(libFBX2glTF
     ${LIBXML2_LIBRARIES}
     ${ZLIB_LIBRARIES}
-    "stdc++fs"
   )
 endif()
 
@@ -268,16 +255,14 @@ target_include_directories(libFBX2glTF SYSTEM PUBLIC
   ${CMAKE_CURRENT_SOURCE_DIR}/src
   "third_party/stb"
   "third_party/json"
-)
+  CONAN_PKG::boost_filesystem
-
+  CONAN_PKG::boost_optional
-target_include_directories(libFBX2glTF SYSTEM PUBLIC
+  CONAN_PKG::fmt
-  Iconv::Iconv
   ${FBXSDK_INCLUDE_DIR}
   ${DRACO_INCLUDE_DIR}
   ${MATHFU_INCLUDE_DIRS}
   ${FIFO_MAP_INCLUDE_DIR}
   ${CPPCODEC_INCLUDE_DIR}
-  ${FMT_INCLUDE_DIR}
   ${LIBXML2_INCLUDE_DIR}
   ${ZLIB_INCLUDE_DIRS}
 )

src/FBX2glTF.h

@@ -20,12 +20,14 @@
 
 #define FBX2GLTF_VERSION std::string("0.9.6")
 
-#include <fbxsdk.h>
 #include <fmt/printf.h>
 
+#include <fbxsdk.h>
+
 #if defined(_WIN32)
 // this is defined in fbxmath.h
 #undef isnan
+#undef snprintf
 #endif
 
 #include "mathfu.hpp"

src/mathfu.hpp

@@ -9,6 +9,8 @@
 
 #pragma once
 
+#include <vector>
+
 #include <fbxsdk.h>
 
 #include <mathfu/matrix.h>

src/utils/File_Utils.cpp

@@ -29,8 +29,8 @@ std::vector<std::string> ListFolderFiles(
   if (folder.empty()) {
     folder = ".";
   }
-  for (const auto& entry : std::filesystem::directory_iterator(folder)) {
+  for (const auto& entry : boost::filesystem::directory_iterator(folder)) {
-    const auto& suffix = FileUtils::GetFileSuffix(entry.path());
+    const auto& suffix = FileUtils::GetFileSuffix(entry.path().string());
     if (suffix.has_value()) {
       const auto& suffix_str = StringUtils::ToLower(suffix.value());
       if (matchExtensions.find(suffix_str) != matchExtensions.end()) {
@@ -42,15 +42,15 @@ std::vector<std::string> ListFolderFiles(
 }
 
 bool CreatePath(const std::string path) {
-  const auto& parent = std::filesystem::path(path).parent_path();
+  const auto& parent = boost::filesystem::path(path).parent_path();
   if (parent.empty()) {
-    // this is either CWD or std::filesystem root; either way it exists
+    // this is either CWD or boost::filesystem root; either way it exists
     return true;
   }
-  if (std::filesystem::exists(parent)) {
+  if (boost::filesystem::exists(parent)) {
-    return std::filesystem::is_directory(parent);
+    return boost::filesystem::is_directory(parent);
   }
-  return std::filesystem::create_directory(parent);
+  return boost::filesystem::create_directory(parent);
 }
 
 bool CopyFile(const std::string& srcFilename, const std::string& dstFilename, bool createPath) {

src/utils/File_Utils.hpp

@@ -9,13 +9,13 @@
 
 #pragma once
 
-#include <filesystem>
-
-#include <optional>
 #include <set>
 #include <string>
 #include <vector>
 
+#include <boost/filesystem.hpp>
+#include <boost/optional.hpp>
+
 namespace FileUtils {
 
 std::string GetCurrentFolder();
@@ -35,37 +35,37 @@ bool CopyFile(
     bool createPath = false);
 
 inline std::string GetAbsolutePath(const std::string& filePath) {
-  return std::filesystem::absolute(filePath).string();
+  return boost::filesystem::absolute(filePath).string();
 }
 
 inline std::string GetCurrentFolder() {
-  return std::filesystem::current_path().string();
+  return boost::filesystem::current_path().string();
 }
 
 inline bool FileExists(const std::string& filePath) {
-  return std::filesystem::exists(filePath) && std::filesystem::is_regular_file(filePath);
+  return boost::filesystem::exists(filePath) && boost::filesystem::is_regular_file(filePath);
 }
 
 inline bool FolderExists(const std::string& folderPath) {
-  return std::filesystem::exists(folderPath) && std::filesystem::is_directory(folderPath);
+  return boost::filesystem::exists(folderPath) && boost::filesystem::is_directory(folderPath);
 }
 
 inline std::string getFolder(const std::string& path) {
-  return std::filesystem::path(path).parent_path().string();
+  return boost::filesystem::path(path).parent_path().string();
 }
 
 inline std::string GetFileName(const std::string& path) {
-  return std::filesystem::path(path).filename().string();
+  return boost::filesystem::path(path).filename().string();
 }
 
 inline std::string GetFileBase(const std::string& path) {
-  return std::filesystem::path(path).stem().string();
+  return boost::filesystem::path(path).stem().string();
 }
 
-inline std::optional<std::string> GetFileSuffix(const std::string& path) {
+inline boost::optional<std::string> GetFileSuffix(const std::string& path) {
-  const auto& extension = std::filesystem::path(path).extension();
+  const auto& extension = boost::filesystem::path(path).extension();
   if (extension.empty()) {
-    return std::nullopt;
+    return boost::none;
   }
   return extension.string().substr(1);
 }