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[rust] Skip processor info on i386 mingw-w64 < 7

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This will limit LLVM thread pools to a single thread on that target, but
we don't use that functionality in rustc anyway.

See also:
8404aeb56a (commitcomment-37406150)
This commit is contained in:
Josh Stone 2020-07-29 11:50:36 -07:00 committed by Nikita Popov
parent 9d74699edc
commit e746ae8048
1 changed files with 6 additions and 0 deletions
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6
llvm/lib/Support/Windows/Threading.inc
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@ -144,6 +144,11 @@ struct ProcessorGroup {
template <typename F>
static bool IterateProcInfo(LOGICAL_PROCESSOR_RELATIONSHIP Relationship, F Fn) {
#if !defined(_WIN64) && defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR < 7
// `GetLogicalProcessorInformationEx@12` was only added to i386 mingw-w64 in v7.0.0
// https://github.com/mingw-w64/mingw-w64/commit/24842d45e025db0d38fa2bbd932b95a83282efa2#diff-faf1d8a1556e75a84b7cef2e89512e79R634
return false;
#else
DWORD Len = 0;
BOOL R = ::GetLogicalProcessorInformationEx(Relationship, NULL, &Len);
if (R || GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
@ -164,6 +169,7 @@ static bool IterateProcInfo(LOGICAL_PROCESSOR_RELATIONSHIP Relationship, F Fn) {
}
free(Info);
return true;
#endif
}
static ArrayRef<ProcessorGroup> getProcessorGroups() {