[LLVMbugs] [Bug 14551] New: clang hangs with -Os when block nested in for and if
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Sat Dec 8 19:15:50 PST 2012
http://llvm.org/bugs/show_bug.cgi?id=14551
Bug #: 14551
Summary: clang hangs with -Os when block nested in for and if
Product: clang
Version: 3.1
Platform: PC
OS/Version: MacOS X
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: unassignedclangbugs at nondot.org
ReportedBy: llvm at ext.emilb.us
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
Perhaps I'm missing something, but the following code:
$ cat hang_clang.c
void hang_clang() {
void (^block)();
__block int foo = 0;
for (int i = 0; i < 10; i++) {
if (foo) {
block = ^{
};
}
}
}
on the following platform:
$ clang -v
Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.2
Thread model: posix
appears to hang clang when complied under -Os:
$ clang -x objective-c -fobjc-arc -Os -c hang_clang.c
^C
(variants using -O<n> do not hang).
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