fable: Fix segfault in GCC 8

Author: cassava

fable/CMakeLists.txt

@@ -52,6 +52,7 @@ target_link_libraries(fable
   PUBLIC
     fmt::fmt
     nlohmann_json::nlohmann_json
+    stdc++fs
 )
 
 option(FABLE_ALLOW_COMMENTS "Allow comments when parsing JSON?" ON)

fable/conanfile.py

@@ -93,6 +93,14 @@ def package_info(self):
         self.cpp_info.set_property("cmake_file_name", "fable")
         self.cpp_info.set_property("cmake_target_name", "fable::fable")
         self.cpp_info.set_property("pkg_config_name", "fable")
+
+        # Linking to libstdc++fs is required on GCC < 9.
+        # (GCC compilers with version < 7 have no std::filesystem support.)
+        # No consideration has been made yet for other compilers,
+        # please add them here as necessary.
+        if self.settings.get_safe("compiler") == "gcc" and self.settings.get_safe("compiler.version") in ["7", "8"]:
+            self.cpp_info.system_libs = ["stdc++fs"]
+
         if not self.in_local_cache:
             self.cpp_info.libs = ["fable"]
             self.cpp_info.includedirs.append(os.path.join(self.build_folder, "include"))