Patch, CMake, fix some warnings in DTL

[Kornel Benko]

Am Mon, 7 Sep 2020 20:51:52 +0200
schrieb Yu Jin <yu_jin at lyx.org>:

> Can I commit the attached patch? It is used here (dtl.h):
> 
> #if (defined(__cplusplus) || defined(__STDC__) || defined(c_plusplus))
> #define STDC 1
> #else
> #define STDC 0
> #endif
> 
> /* Version (Traditional or ANSI) of C affects prototype and type
> definitions */
> #if STDC
> #define ARGS(parenthesized_list) parenthesized_list
> #else /* NOT STDC */
> #define ARGS(parenthesized_list) ()
> #endif /* NOT STDC */
> 
> #if STDC
> #define Void void     <-- meant to activate this
> #define VOID void
> #define FILE_BEGIN SEEK_SET
> #else  /* NOT STDC */
> #define Void int        <-- currently this is used
> #define VOID
> #define FILE_BEGIN 0
> #endif /* NOT STDC */
> 
> so the functions which don't return anything actually end up as
> "int fun(...)" not "void fun(...)" and Warnings are produced.
> 
> Can also enclose it in a "if (WIN32)" block if not wanted on other
> platforms.

So it is not STDC on Windows?
Then I propose to wrap the changes into "if (WIN32)"

	Kornel
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