The function preprocessor is broken. The line numbers are incorrect.
It's because no #line directives are added before the #include (#line 1 "PATH\define.hpp) and after the #include (#line N "PATH\fn_someFnc.sqf")
See the steps to reproduce and additional details.
preprocessorFileLineNumbers works fine.
Create a function in description.ext. Put this EXACT code in it (it contains errors but it's for testing):
#include "defines.hpp" "line2"; "line3"; "line4"; "This should be line 5" BUT ITS LINE10
contents of defines.hpp (5 lines):
"incl line 1"; "incl line 2"; "incl line 3"; "incl line 4"; "incl line 5";
This is how the function is preprocessed by CfgFunctions (use copyToClipboard str TEST_fnc_TEST):
{
private _fnc_scriptNameParent = if (isNil '_fnc_scriptName') then {'TEST_fnc_TEST'} else {_fnc_scriptName};
private _fnc_scriptName = 'TEST_fnc_TEST';
scriptName _fnc_scriptName;
#line 1 "TEST\fn_TEST.sqf [TEST_fnc_TEST]"
"incl line 1";
"incl line 2";
"incl line 3";
"incl line 4";
"incl line 5";
"line2";
"line3";
"line4";
"This should be line 5" BUT ITS LINE10}This is how it should be (you can validate this if you use preprocessorFileLineNumbers instead of functions):
Notice that there are now 2 #line directives. One before the #include (with file name set to that of the header file), and one after it (with file name set to the source file)
{
private _fnc_scriptNameParent = if (isNil '_fnc_scriptName') then {'TEST_fnc_TEST'} else {_fnc_scriptName};
private _fnc_scriptName = 'TEST_fnc_TEST';
scriptName _fnc_scriptName;
#line 1 "TEST\defines.hpp"
"included line 1";
"included line 2";
"included line 3";
"included line 4";
"included line 5";
#line 1 "TEST\fn_TEST.sqf [TEST_fnc_TEST]"
"line2";
"line3";
"line4";
"This should be line 5" BUT ITS LINE10}Not a preprocessor bug.
CfgFunction uses preprocessFile, that is supposed to not have line numbers.
Everything is working correctly here.
CfgFunctions should be changed to use preprocessFileLineNumbers yes, and it will be. But nothing is wrong with the preprocessor.