LLONG_MIN and LLONG_MAX constants in C++ code

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1

Hello!

There’s a bug in /usr/include/limits.h file in 6.2.
If compiled with C code, LLONG_xxx constants are OK (endind with LL),
but with C++ compilation fails:

[compiler output]
22.cc: In function `int main()’:
22.cc:6: integer constant out of range
22.cc:6: warning: decimal integer constant is so large that it is unsigned

[limits.h file]
…
#if INT_BITS-0 == 64
#define LLONG_MIN (-9223372036854775807LL-1) /* minimum value of a
long long /
#define LLONG_MAX 9223372036854775807LL / maximum value of a
long long /
#define ULLONG_MAX 18446744073709551615ULL / maximum value of an
unsigned long long /
#else
#define LLONG_MIN (-9223372036854775807-1) / minimum value of a
long long /
#define LLONG_MAX 9223372036854775807 / maximum value of a
long long /
#define ULLONG_MAX 18446744073709551615U / maximum value of an
unsigned long long */
#endif
…

Dmitry Alexeyev

2

Thanks Dmitry. This has been fixed. The LL and ULL modifiers are
on the wrong set of defines.

Dmitry Alexeyev <dmi@qnx.org.ru> wrote:

Hello!

There’s a bug in /usr/include/limits.h file in 6.2.
If compiled with C code, LLONG_xxx constants are OK (endind with LL),
but with C++ compilation fails:

[compiler output]
22.cc: In function `int main()’:
22.cc:6: integer constant out of range
22.cc:6: warning: decimal integer constant is so large that it is unsigned

[limits.h file]
…
#if INT_BITS-0 == 64
#define LLONG_MIN (-9223372036854775807LL-1) /* minimum value of a
long long /
#define LLONG_MAX 9223372036854775807LL / maximum value of a
long long /
#define ULLONG_MAX 18446744073709551615ULL / maximum value of an
unsigned long long /
#else
#define LLONG_MIN (-9223372036854775807-1) / minimum value of a
long long /
#define LLONG_MAX 9223372036854775807 / maximum value of a
long long /
#define ULLONG_MAX 18446744073709551615U / maximum value of an
unsigned long long */
#endif
…

Dmitry Alexeyev

–
cburgess@qnx.com

3

Colin Burgess ÐÉÛÅÔ:

Thanks Dmitry. This has been fixed. The LL and ULL modifiers are
on the wrong set of defines.

But why it works in two different ways on one machine with C and C++
compilers? C compiler gets into first set, and C++ into second one.

Dmitry

4

It doesn’t get the two different cases, but the default type of
constants is different between the C and C++ compilers.

Thanks Dmitry. This has been fixed. The LL and ULL modifiers are
on the wrong set of defines.

But why it works in two different ways on one machine with C and C++
compilers? C compiler gets into first set, and C++ into second one.

Dmitry

–
cburgess@qnx.com