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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
114 lines
5.3 KiB
C++
114 lines
5.3 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 <cstdlib>
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#include <cstdlib>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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// As of 1/10/2015 clang emits a -Wnonnull warnings even if the warning occurs
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// in an unevaluated context. For this reason we manually suppress the warning.
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#if defined(__clang__)
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#pragma clang diagnostic ignored "-Wnonnull"
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#endif
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#ifndef EXIT_FAILURE
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#error EXIT_FAILURE not defined
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#endif
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#ifndef EXIT_SUCCESS
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#error EXIT_SUCCESS not defined
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#endif
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#ifndef MB_CUR_MAX
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#error MB_CUR_MAX not defined
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#endif
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#ifndef NULL
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#error NULL not defined
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#endif
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#ifndef RAND_MAX
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#error RAND_MAX not defined
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#endif
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template <class TestType, class IntType>
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void test_div_struct() {
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TestType obj;
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static_assert(sizeof(obj) >= sizeof(IntType) * 2, ""); // >= to account for alignment.
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static_assert((std::is_same<decltype(obj.quot), IntType>::value), "");
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static_assert((std::is_same<decltype(obj.rem), IntType>::value), "");
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((void) obj);
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};
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int main(int, char**)
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{
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std::size_t s = 0;
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((void)s);
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static_assert((std::is_same<std::size_t, decltype(sizeof(int))>::value), "");
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test_div_struct<std::div_t, int>();
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test_div_struct<std::ldiv_t, long>();
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test_div_struct<std::lldiv_t, long long>();
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char** endptr = 0;
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static_assert((std::is_same<decltype(std::atof("")), double>::value), "");
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static_assert((std::is_same<decltype(std::atoi("")), int>::value), "");
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static_assert((std::is_same<decltype(std::atol("")), long>::value), "");
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static_assert((std::is_same<decltype(std::atoll("")), long long>::value), "");
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static_assert((std::is_same<decltype(std::getenv("")), char*>::value), "");
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static_assert((std::is_same<decltype(std::strtod("", endptr)), double>::value), "");
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static_assert((std::is_same<decltype(std::strtof("", endptr)), float>::value), "");
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static_assert((std::is_same<decltype(std::strtold("", endptr)), long double>::value), "");
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static_assert((std::is_same<decltype(std::strtol("", endptr,0)), long>::value), "");
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static_assert((std::is_same<decltype(std::strtoll("", endptr,0)), long long>::value), "");
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static_assert((std::is_same<decltype(std::strtoul("", endptr,0)), unsigned long>::value), "");
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static_assert((std::is_same<decltype(std::strtoull("", endptr,0)), unsigned long long>::value), "");
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static_assert((std::is_same<decltype(std::rand()), int>::value), "");
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static_assert((std::is_same<decltype(std::srand(0)), void>::value), "");
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// Microsoft does not implement aligned_alloc in their C library
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#if TEST_STD_VER > 14 && defined(TEST_HAS_C11_FEATURES) && !defined(_WIN32)
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static_assert((std::is_same<decltype(aligned_alloc(0,0)), void*>::value), "");
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#endif
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static_assert((std::is_same<decltype(std::calloc(0,0)), void*>::value), "");
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static_assert((std::is_same<decltype(std::free(0)), void>::value), "");
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static_assert((std::is_same<decltype(std::malloc(0)), void*>::value), "");
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static_assert((std::is_same<decltype(std::realloc(0,0)), void*>::value), "");
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static_assert((std::is_same<decltype(std::abort()), void>::value), "");
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static_assert((std::is_same<decltype(std::atexit(0)), int>::value), "");
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static_assert((std::is_same<decltype(std::exit(0)), void>::value), "");
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static_assert((std::is_same<decltype(std::_Exit(0)), void>::value), "");
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static_assert((std::is_same<decltype(std::getenv("")), char*>::value), "");
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static_assert((std::is_same<decltype(std::system("")), int>::value), "");
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static_assert((std::is_same<decltype(std::bsearch(0,0,0,0,0)), void*>::value), "");
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static_assert((std::is_same<decltype(std::qsort(0,0,0,0)), void>::value), "");
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static_assert((std::is_same<decltype(std::abs(0)), int>::value), "");
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static_assert((std::is_same<decltype(std::abs((long)0)), long>::value), "");
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static_assert((std::is_same<decltype(std::abs((long long)0)), long long>::value), "");
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static_assert((std::is_same<decltype(std::labs((long)0)), long>::value), "");
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static_assert((std::is_same<decltype(std::llabs((long long)0)), long long>::value), "");
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static_assert((std::is_same<decltype(std::div(0,0)), std::div_t>::value), "");
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static_assert((std::is_same<decltype(std::div(0L,0L)), std::ldiv_t>::value), "");
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static_assert((std::is_same<decltype(std::div(0LL,0LL)), std::lldiv_t>::value), "");
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static_assert((std::is_same<decltype(std::ldiv(0L,0L)), std::ldiv_t>::value), "");
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static_assert((std::is_same<decltype(std::lldiv(0LL,0LL)), std::lldiv_t>::value), "");
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wchar_t* pw = 0;
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const wchar_t* pwc = 0;
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char* pc = 0;
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static_assert((std::is_same<decltype(std::mblen("",0)), int>::value), "");
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static_assert((std::is_same<decltype(std::mbtowc(pw,"",0)), int>::value), "");
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static_assert((std::is_same<decltype(std::wctomb(pc,L' ')), int>::value), "");
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static_assert((std::is_same<decltype(std::mbstowcs(pw,"",0)), std::size_t>::value), "");
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static_assert((std::is_same<decltype(std::wcstombs(pc,pwc,0)), std::size_t>::value), "");
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return 0;
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}
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