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build: fix sysctl() detection on macOS

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sysctl() on *BSD takes a "const int *name", whereas sysctl() on macOS
it takes an "int *name". So our configure check and sysctl() detection on
macOS currently fails:

```bash
/usr/include/sys/sysctl.h:759:9: note: candidate function not viable:
	no known conversion from 'const int [2]' to 'int *' for 1st argument
int     sysctl(int *, u_int, void *, size_t *, void *, size_t);
```

This change removes the name argument from the sysctl() detection check,
meaning we will detect correctly on macOS and *BSD.

For consistency we also switch to using the more generic, non-const
version of the name parameter in the rest of our usage.
This commit is contained in:
fanquake 2020-03-16 17:20:27 +08:00
parent a421e0a22f
commit e90e3e684f
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2 changed files with 8 additions and 6 deletions
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4
src/random.cpp
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@ -321,10 +321,10 @@ void GetOSRand(unsigned char *ent32)
RandFailure();
}
#elif defined(HAVE_SYSCTL_ARND)
/* FreeBSD and similar. It is possible for the call to return less
/* FreeBSD, NetBSD and similar. It is possible for the call to return less
* bytes than requested, so need to read in a loop.
*/
static const int name[2] = {CTL_KERN, KERN_ARND};
static int name[2] = {CTL_KERN, KERN_ARND};
int have = 0;
do {
size_t len = NUM_OS_RANDOM_BYTES - have;