https://bugs.llvm.org/show_bug.cgi?id=34809
Bug ID: 34809
Summary: Passing multiple optimization level options (e.g., /O1
/O2) to clang-cl causes "argument unused" warning
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Driver
Assignee: unassignedclangb...@nondot.org
Reporter: dco...@google.com
CC: llvm-bugs@lists.llvm.org
I am using trunk r314281. I would expect passing multiple /O<value> option to
cause the driver to use the final one passed (i.e., the behavior seen with
normal clang and multiple -O<value> options).
$ cat a.cc
int main() { return 0; }
$ clang-cl -c /O1 a.cc
<works fine -- no output>
$ clang-cl -c /O1 /O1 a.cc
clang-cl: warning: argument unused during compilation: '/O1'
[-Wunused-command-line-argument]
$ clang-cl -c /O1 /O2 a.cc
clang-cl: warning: argument unused during compilation: '/O1'
[-Wunused-command-line-argument]
$ clang-cl -c /O2 /O1 a.cc
clang-cl: warning: argument unused during compilation: '/O2'
[-Wunused-command-line-argument
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