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re PR preprocessor/39559 (constants too large for intmax_t need pedwarns)

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libcpp:
	PR preprocessor/39559
	* expr.c (cpp_interpret_integer): Use a pedwarn for decimal
	constants larger than intmax_t in C99 mode.

gcc/testsuite:
	* gcc.dg/c99-intconst-2.c: New test.

From-SVN: r146777
This commit is contained in:
Joseph Myers 2009-04-25 19:46:03 +01:00 • committed by Joseph Myers
parent a3710436b6
commit f88d07724f
4 changed files with 39 additions and 1 deletions
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21
libcpp/expr.c
View file

@ -538,8 +538,27 @@ cpp_interpret_integer (cpp_reader *pfile, const cpp_token *token,
&& pfile->state.in_directive)
&& !num_positive (result, precision))
{
/* This is for constants within the range of uintmax_t but
not that or intmax_t. For such decimal constants, a
diagnostic is required for C99 as the selected type must
be signed and not having a type is a constraint violation
(DR#298, TC3), so this must be a pedwarn. For C90,
unsigned long is specified to be used for a constant that
does not fit in signed long; if uintmax_t has the same
range as unsigned long this means only a warning is
appropriate here. C90 permits the preprocessor to use a
wider range than unsigned long in the compiler, so if
uintmax_t is wider than unsigned long no diagnostic is
required for such constants in preprocessor #if
expressions and the compiler will pedwarn for such
constants outside the range of unsigned long that reach
the compiler so a diagnostic is not required there
either; thus, pedwarn for C99 but use a plain warning for
C90. */
if (base == 10)
cpp_error (pfile, CPP_DL_WARNING,
cpp_error (pfile, (CPP_OPTION (pfile, c99)
? CPP_DL_PEDWARN
: CPP_DL_WARNING),
"integer constant is so large that it is unsigned");
result.unsignedp = true;
}