为什么不 <string.h> 在getopt库中？

Question

I have been using Ludvig Jerabek's port of the GNU getopt on Windows and getting errors on lines like:

if (d->optind != argc && !_tcscmp(argv[d->optind], _T("--")))

_tcscmp is a macro that resolves to strcmp on my system and then it reports strcmp not found. If we examine the headers in getopt.cpp:

/* Getopt for Microsoft C  
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Date: 02/03/2011 - Ludvik Jerabek - Initial Release
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Revisions:
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08/09/2011
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#include <stdlib.h>
#include <stdio.h>
#include "getopt.h"

We see the problem: <string.h> is not included. I guess in Visual Studio <string.h> is included automatically maybe? I know I have successfully built getopt.cpp in Visual Studio, but using a manual environment with gcc on MinGW it is complaining about all the string compare functions being missing. What is the explanation for this?

Answer 1

The real tchar.h causes either #include <string.h> or #include <mbstring.h> depending on the character-set macros.

You have a broken version of tchar.h that does not correctly emulate these Microsoft-specific "Generic-Text Routine Mappings".