https://bugs.llvm.org/show_bug.cgi?id=43425
Bug ID: 43425
Summary: -fprofile-generate profile merging from concurrent
processes fails on Windows with "LLVM Profile Error:
Failed to write file ... File exists"
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: h...@chromium.org
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
For example, consider a simple program:
int main() {
unsigned x = 1;
for (int i = 0; i < 100*1000*1000; i++) {
x *= i;
}
return 0;
}
built with instrumentation:
clang-cl -fprofile-generate=\src\tmp\ \src\tmp\a.cc
and run in an bunch of concurrent invocations (using e.g. Cygwin):
$ for i in `seq 1 100` ; do ./a.exe & done
A bunch of the program invocations fail to write their profile:
LLVM Profile Error: Failed to write file
"\src\tmp\default_15822669652030248442_0.profraw": File exists
LLVM Profile Error: Failed to write file
"\src\tmp\default_15822669652030248442_0.profraw": File exists
LLVM Profile Error: Failed to write file
"\src\tmp\default_15822669652030248442_0.profraw": File exists
(This shows up when running instrumented tablegen binaries as part of building
IR-instrumented Clang on Windows, see e.g.
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8901886476057032176/+/steps/package_clang/0/stdout)
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