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platform_long.c revision 1.4 
      1 /*	$NetBSD: platform_long.c,v 1.4 2022/06/11 11:52:13 rillig Exp $	*/
      2 # 3 "platform_long.c"
      3 
      4 /*
      5  * Test features that only apply to platforms on which size_t is unsigned
      6  * long and ptr_diff is signed long.
      7  */
      8 
      9 /* lint1-extra-flags: -c -h -a -p -b -r -z */
     10 /* lint1-only-if: long */
     11 
     12 void to_size(typeof(sizeof(int)));
     13 
     14 /* See should_warn_about_prototype_conversion. */
     15 void
     16 convert_unsigned_char_to_size(unsigned char uc)
     17 {
     18 	/*
     19 	 * In this function call, uc is first promoted to INT. It is then
     20 	 * converted to size_t, which is ULONG. The portable bit size of INT
     21 	 * is 24 (see INT_RSIZE in inittyp.c), which is less than the 32 of
     22 	 * ULONG. Since the portable bit size increases from 24 to 32, there
     23 	 * is no warning.
     24 	 *
     25 	 * XXX: Investigate whether this rule makes sense. Warning 259 is
     26 	 * about prototype mismatch, not about lossy integer conversions,
     27 	 * and there is a clear mismatch here between INT and LONG,
     28 	 * therefore a warning makes sense.
     29 	 */
     30 	to_size(uc);
     31 }
     32 
     33 /* expect+1: warning: static variable 'unused_variable' unused [226] */
     34 static int unused_variable;
     35