2df59c5068
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 llvm-svn: 353086
186 lines
3.0 KiB
C++
186 lines
3.0 KiB
C++
//===----------------------------------------------------------------------===//
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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 <float.h>
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#include <float.h>
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#include "test_macros.h"
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#ifndef FLT_ROUNDS
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#error FLT_ROUNDS not defined
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#endif
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#ifndef FLT_EVAL_METHOD
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#error FLT_EVAL_METHOD not defined
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#endif
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#ifndef FLT_RADIX
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#error FLT_RADIX not defined
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#endif
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#if TEST_STD_VER > 14 && defined(TEST_HAS_C11_FEATURES) && 0
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#ifndef FLT_HAS_SUBNORM
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#error FLT_HAS_SUBNORM not defined
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#endif
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#ifndef DBL_HAS_SUBNORM
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#error DBL_HAS_SUBNORM not defined
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#endif
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#ifndef LDBL_HAS_SUBNORM
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#error LDBL_HAS_SUBNORM not defined
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#endif
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#endif
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#ifndef FLT_MANT_DIG
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#error FLT_MANT_DIG not defined
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#endif
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#ifndef DBL_MANT_DIG
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#error DBL_MANT_DIG not defined
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#endif
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#ifndef LDBL_MANT_DIG
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#error LDBL_MANT_DIG not defined
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#endif
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#ifndef DECIMAL_DIG
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#error DECIMAL_DIG not defined
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#endif
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#if TEST_STD_VER > 14 && defined(TEST_HAS_C11_FEATURES) && 0
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#ifndef FLT_DECIMAL_DIG
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#error FLT_DECIMAL_DIG not defined
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#endif
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#ifndef DBL_DECIMAL_DIG
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#error DBL_DECIMAL_DIG not defined
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#endif
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#ifndef LDBL_DECIMAL_DIG
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#error LDBL_DECIMAL_DIG not defined
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#endif
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#endif
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#ifndef FLT_DIG
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#error FLT_DIG not defined
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#endif
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#ifndef DBL_DIG
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#error DBL_DIG not defined
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#endif
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#ifndef LDBL_DIG
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#error LDBL_DIG not defined
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#endif
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#ifndef FLT_MIN_EXP
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#error FLT_MIN_EXP not defined
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#endif
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#ifndef DBL_MIN_EXP
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#error DBL_MIN_EXP not defined
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#endif
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#ifndef LDBL_MIN_EXP
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#error LDBL_MIN_EXP not defined
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#endif
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#ifndef FLT_MIN_10_EXP
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#error FLT_MIN_10_EXP not defined
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#endif
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#ifndef DBL_MIN_10_EXP
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#error DBL_MIN_10_EXP not defined
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#endif
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#ifndef LDBL_MIN_10_EXP
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#error LDBL_MIN_10_EXP not defined
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#endif
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#ifndef FLT_MAX_EXP
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#error FLT_MAX_EXP not defined
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#endif
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#ifndef DBL_MAX_EXP
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#error DBL_MAX_EXP not defined
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#endif
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#ifndef LDBL_MAX_EXP
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#error LDBL_MAX_EXP not defined
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#endif
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#ifndef FLT_MAX_10_EXP
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#error FLT_MAX_10_EXP not defined
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#endif
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#ifndef DBL_MAX_10_EXP
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#error DBL_MAX_10_EXP not defined
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#endif
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#ifndef LDBL_MAX_10_EXP
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#error LDBL_MAX_10_EXP not defined
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#endif
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#ifndef FLT_MAX
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#error FLT_MAX not defined
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#endif
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#ifndef DBL_MAX
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#error DBL_MAX not defined
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#endif
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#ifndef LDBL_MAX
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#error LDBL_MAX not defined
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#endif
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#ifndef FLT_EPSILON
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#error FLT_EPSILON not defined
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#endif
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#ifndef DBL_EPSILON
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#error DBL_EPSILON not defined
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#endif
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#ifndef LDBL_EPSILON
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#error LDBL_EPSILON not defined
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#endif
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#ifndef FLT_MIN
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#error FLT_MIN not defined
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#endif
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#ifndef DBL_MIN
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#error DBL_MIN not defined
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#endif
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#ifndef LDBL_MIN
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#error LDBL_MIN not defined
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#endif
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#if TEST_STD_VER > 14 && defined(TEST_HAS_C11_FEATURES) && 0
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#ifndef FLT_TRUE_MIN
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#error FLT_TRUE_MIN not defined
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#endif
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#ifndef DBL_TRUE_MIN
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#error DBL_TRUE_MIN not defined
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#endif
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#ifndef LDBL_TRUE_MIN
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#error LDBL_TRUE_MIN not defined
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#endif
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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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