mirror of
https://github.com/golang/go
synced 2024-11-23 04:30:03 -07:00
da769814b8
Before GCC 8 C code like
const unsigned long long int neg = (const unsigned long long) -1;
void f(void) { static const double x = (neg); }
would get an error "initializer element is not constant". In GCC 8 and
later it does not.
Because a value like neg, above, can not be used as a general integer
constant, this causes cgo to conclude that it is a floating point
constant. The way that cgo handles floating point values then causes
it to get the wrong value for it: 18446744073709551615 rather than -1.
These are of course the same value when converted to int64, but Go
does not permit that kind of conversion for an out-of-range constant.
This CL side-steps the problem by treating floating point constants
with integer type as they would up being treated before GCC 8: as
variables rather than constants.
Fixes #26066
Change-Id: I6f2f9ac2fa8a4b8218481b474f0b539758eb3b79
Reviewed-on: https://go-review.googlesource.com/121035
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
|
||
|---|---|---|
| .. | ||
| errors | ||
| fortran | ||
| gmp | ||
| life | ||
| nocgo | ||
| stdio | ||
| test | ||
| testasan | ||
| testcarchive | ||
| testcshared | ||
| testgodefs | ||
| testplugin | ||
| testsanitizers | ||
| testshared | ||
| testsigfwd | ||
| testso | ||
| testsovar | ||
| testtls | ||