mirror of
https://github.com/llvm-mirror/libcxx.git
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e15dd4e32e
Summary: Freestanding is *weird*. The standard allows it to differ in a bunch of odd manners from regular C++, and the committee would like to improve that situation. I'd like to make libc++ behave better with what freestanding should be, so that it can be a tool we use in improving the standard. To do that we need to try stuff out, both with "freestanding the language mode" and "freestanding the library subset". Let's start with the super basic: run the libc++ tests in freestanding, using clang as the compiler, and see what works. The easiest hack to do this: In utils/libcxx/test/config.py add: self.cxx.compile_flags += ['-ffreestanding'] Run the tests and they all fail. Why? Because in freestanding `main` isn't special. This "not special" property has two effects: main doesn't get mangled, and main isn't allowed to omit its `return` statement. The first means main gets mangled and the linker can't create a valid executable for us to test. The second means we spew out warnings (ew) and the compiler doesn't insert the `return` we omitted, and main just falls of the end and does whatever undefined behavior (if you're luck, ud2 leading to non-zero return code). Let's start my work with the basics. This patch changes all libc++ tests to declare `main` as `int main(int, char**` so it mangles consistently (enabling us to declare another `extern "C"` main for freestanding which calls the mangled one), and adds `return 0;` to all places where it was missing. This touches 6124 files, and I apologize. The former was done with The Magic Of Sed. The later was done with a (not quite correct but decent) clang tool: https://gist.github.com/jfbastien/793819ff360baa845483dde81170feed This works for most tests, though I did have to adjust a few places when e.g. the test runs with `-x c`, macros are used for main (such as for the filesystem tests), etc. Once this is in we can create a freestanding bot which will prevent further regressions. After that, we can start the real work of supporting C++ freestanding fairly well in libc++. <rdar://problem/47754795> Reviewers: ldionne, mclow.lists, EricWF Subscribers: christof, jkorous, dexonsmith, arphaman, miyuki, libcxx-commits Differential Revision: https://reviews.llvm.org/D57624 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@353086 91177308-0d34-0410-b5e6-96231b3b80d8
347 lines
4.7 KiB
C++
347 lines
4.7 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// test <cerrno>
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#include <cerrno>
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#ifndef E2BIG
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#error E2BIG not defined
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#endif
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#ifndef EACCES
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#error EACCES not defined
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#endif
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#ifndef EACCES
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#error EACCES not defined
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#ifndef EADDRINUSE
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#error EADDRINUSE not defined
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#endif
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#ifndef EADDRNOTAVAIL
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#error EADDRNOTAVAIL not defined
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#endif
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#ifndef EAFNOSUPPORT
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#error EAFNOSUPPORT not defined
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#endif
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#ifndef EAGAIN
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#error EAGAIN not defined
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#endif
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#ifndef EALREADY
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#error EALREADY not defined
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#ifndef EBADF
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#error EBADF not defined
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#endif
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#ifndef EBADMSG
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#error EBADMSG not defined
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#endif
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#ifndef EBUSY
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#error EBUSY not defined
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#endif
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#ifndef ECANCELED
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#ifndef ECHILD
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#ifndef ECONNABORTED
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#error ECONNABORTED not defined
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#ifndef ECONNREFUSED
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#error ECONNREFUSED not defined
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#ifndef ECONNRESET
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#ifndef EDOM
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#ifndef EFAULT
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#error EFAULT not defined
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#ifndef EFBIG
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#error EFBIG not defined
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#ifndef EHOSTUNREACH
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#error EHOSTUNREACH not defined
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#ifndef EINTR
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#ifndef EINVAL
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#error ENETUNREACH not defined
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#ifndef ENFILE
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#ifndef ENOBUFS
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#if (defined(_XOPEN_STREAMS) && _XOPEN_STREAMS != -1)
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#ifndef ENOENT
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#ifndef ENOEXEC
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#error ENOEXEC not defined
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#ifndef ENOLCK
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#ifndef ENOMEM
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#error ENOMSG not defined
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#ifndef ENOPROTOOPT
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#error ENOPROTOOPT not defined
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#endif
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#ifndef ENOSPC
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#error ENOSPC not defined
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#endif
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#if (defined(_XOPEN_STREAMS) && _XOPEN_STREAMS != -1)
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#ifndef ENOSR
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#endif
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#if (defined(_XOPEN_STREAMS) && _XOPEN_STREAMS != -1)
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#ifndef ENOSTR
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#error ENOSTR not defined
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#endif
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#ifndef ENOSYS
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#error ENOSYS not defined
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#ifndef ENOTCONN
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#error ENOTCONN not defined
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#endif
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#ifndef ENOTDIR
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#error ENOTDIR not defined
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#endif
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#ifndef ENOTEMPTY
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#error ENOTEMPTY not defined
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#endif
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#ifndef ENOTRECOVERABLE
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#error ENOTRECOVERABLE not defined
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#endif
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#ifndef ENOTSOCK
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#error ENOTSOCK not defined
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#endif
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#ifndef ENOTSUP
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#error ENOTSUP not defined
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#endif
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#ifndef ENOTTY
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#error ENOTTY not defined
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#endif
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#ifndef ENXIO
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#error ENXIO not defined
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#endif
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#ifndef EOPNOTSUPP
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#error EOPNOTSUPP not defined
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#endif
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#ifndef EOVERFLOW
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#error EOVERFLOW not defined
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#endif
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#ifndef EOWNERDEAD
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#error EOWNERDEAD not defined
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#endif
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#ifndef EPERM
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#error EPERM not defined
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#endif
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#ifndef EPIPE
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#error EPIPE not defined
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#endif
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#ifndef EPROTO
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#error EPROTO not defined
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#endif
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#ifndef EPROTONOSUPPORT
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#error EPROTONOSUPPORT not defined
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#endif
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#ifndef EPROTOTYPE
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#error EPROTOTYPE not defined
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#ifndef ERANGE
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#error ERANGE not defined
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#endif
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#ifndef EROFS
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#error EROFS not defined
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#endif
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#ifndef ESPIPE
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#error ESPIPE not defined
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#endif
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#ifndef ESRCH
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#error ESRCH not defined
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#endif
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#if (defined(_XOPEN_STREAMS) && _XOPEN_STREAMS != -1)
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#ifndef ETIME
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#error ETIME not defined
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#endif
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#endif
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#ifndef ETIMEDOUT
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#error ETIMEDOUT not defined
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#ifndef ETXTBSY
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#error ETXTBSY not defined
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#endif
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#ifndef EWOULDBLOCK
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#error EWOULDBLOCK not defined
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#endif
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#ifndef EXDEV
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#error EXDEV not defined
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#endif
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#ifndef errno
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#error errno not defined
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#endif
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int main(int, char**)
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{
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return 0;
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}
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