http://llvm.org/bugs/show_bug.cgi?id=21589
Bug ID: 21589
Summary: clang-cl.exe does not reproduce semantic of cl.exe's
/Fo switch correctly
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Overview
--------
The clang-cl.exe driver as shipped with clang version 3.6.0 (221592) does not
reproduce the semantic of the /Fo switch correctly.
How to Reproduce
----------------
1. Create a source file 'x.cpp' containing just
void f() {}
2. Compile the source file by running
clang-cl /c /Fo x.cpp
Actual Results
--------------
clang-cl.exe prints an error message saying
clang-cl.exe: error: argument to '/Fo' is missing (expected 1 value)
Expected Results
----------------
clang does not print any output. Instead, it compiles the given source file,
and writes an object file with the default name -- x.obj
Build Date & Platform
---------------------
clang version 3.6.0 (221592)
Target: i686-pc-windows-msvc
Thread model: posix
Additional Information
----------------------
Contrary to what the MSDN documentation and the "cl.exe /help" output says, the
/Fo switch (which can be used to define the name of the output file) does *not*
require an argument. If no argment is given, the default name will be used
(i.e. it appears to behave as if /Fo was not specified at all).
This differene in behaviour unfortunately breaks using clang-cl as a drop-in
replacement for cl for setups which rely on compiler invocations to work even
if no argument to /Fo is given.
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