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work around ubuntu 20.10 build issue

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NetHack was trying to suppress warn_unused_result
in include/tradstdc.h, by defining warn_unused_result
to an empty string. That began causing a build error
in a system-supplied header file cdefs.h
when using 20.10 ubuntu impish.

Try skipping that in tradstdc.h for any linux, unless
the NetHack build defines GCC_URWARN to force it into
play.
This commit is contained in:
nhmall
2022-01-04 08:24:08 -05:00
parent c54c857372
commit 1cb5dc0460
1 changed files with 2 additions and 0 deletions
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2
include/tradstdc.h
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@@ -405,12 +405,14 @@ typedef genericptr genericptr_t; /* (void *) or (char *) */
#if __GNUC__ >= 3
#define UNUSED __attribute__((unused))
#define NORETURN __attribute__((noreturn))
#if !defined(__linux__) || defined(GCC_URWARN)
/* disable gcc's __attribute__((__warn_unused_result__)) since explicitly
discarding the result by casting to (void) is not accepted as a 'use' */
#define __warn_unused_result__ /*empty*/
#define warn_unused_result /*empty*/
#endif
#endif
#endif
#ifndef PRINTF_F
#define PRINTF_F(f, v)