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llvm-project/libcxx/test/std/depr/depr.c.headers/stdio_h.pass.cpp
JF Bastien 2df59c5068 Support tests in freestanding 
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
2019-02-04 20:31:13 +00:00

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// test <stdio.h>
#include <stdio.h>
#include <type_traits>
#include "test_macros.h"
#ifdef getc
#error getc is defined
#endif
#ifdef putc
#error putc is defined
#endif
#ifdef clearerr
#error clearerr is defined
#endif
#ifdef feof
#error feof is defined
#endif
#ifdef ferror
#error ferror is defined
#endif
#ifndef BUFSIZ
#error BUFSIZ not defined
#endif
#ifndef EOF
#error EOF not defined
#endif
#ifndef FILENAME_MAX
#error FILENAME_MAX not defined
#endif
#ifndef FOPEN_MAX
#error FOPEN_MAX not defined
#endif
#ifndef L_tmpnam
#error L_tmpnam not defined
#endif
#ifndef NULL
#error NULL not defined
#endif
#ifndef SEEK_CUR
#error SEEK_CUR not defined
#endif
#ifndef SEEK_END
#error SEEK_END not defined
#endif
#ifndef SEEK_SET
#error SEEK_SET not defined
#endif
#ifndef TMP_MAX
#error TMP_MAX not defined
#endif
#ifndef _IOFBF
#error _IOFBF not defined
#endif
#ifndef _IOLBF
#error _IOLBF not defined
#endif
#ifndef _IONBF
#error _IONBF not defined
#endif
#ifndef stderr
#error stderr not defined
#endif
#ifndef stdin
#error stdin not defined
#endif
#ifndef stdout
#error stdout not defined
#endif
#include <cstdarg>
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic ignored "-Wformat-zero-length"
#pragma GCC diagnostic ignored "-Wdeprecated-declarations" // for tmpnam
#endif
int main(int, char**)
{
FILE* fp = 0;
fpos_t fpos = fpos_t();
size_t s = 0;
char* cp = 0;
char arr[] = {'a', 'b'};
va_list va;
((void)fp); // Prevent unused warning
((void)fpos); // Prevent unused warning
((void)s); // Prevent unused warning
((void)cp); // Prevent unused warning
((void)arr); // Prevent unused warning
((void)va); // Prevent unused warning
static_assert((std::is_same<decltype(remove("")), int>::value), "");
static_assert((std::is_same<decltype(rename("","")), int>::value), "");
static_assert((std::is_same<decltype(tmpfile()), FILE*>::value), "");
static_assert((std::is_same<decltype(tmpnam(cp)), char*>::value), "");
static_assert((std::is_same<decltype(fclose(fp)), int>::value), "");
static_assert((std::is_same<decltype(fflush(fp)), int>::value), "");
static_assert((std::is_same<decltype(fopen("", "")), FILE*>::value), "");
static_assert((std::is_same<decltype(freopen("", "", fp)), FILE*>::value), "");
static_assert((std::is_same<decltype(setbuf(fp,cp)), void>::value), "");
static_assert((std::is_same<decltype(vfprintf(fp,"",va)), int>::value), "");
static_assert((std::is_same<decltype(fprintf(fp," ")), int>::value), "");
static_assert((std::is_same<decltype(fscanf(fp,"")), int>::value), "");
static_assert((std::is_same<decltype(printf("\n")), int>::value), "");
static_assert((std::is_same<decltype(scanf("\n")), int>::value), "");
static_assert((std::is_same<decltype(snprintf(cp,0,"p")), int>::value), "");
static_assert((std::is_same<decltype(sprintf(cp," ")), int>::value), "");
static_assert((std::is_same<decltype(sscanf("","")), int>::value), "");
static_assert((std::is_same<decltype(vfprintf(fp,"",va)), int>::value), "");
static_assert((std::is_same<decltype(vfscanf(fp,"",va)), int>::value), "");
static_assert((std::is_same<decltype(vprintf(" ",va)), int>::value), "");
static_assert((std::is_same<decltype(vscanf("",va)), int>::value), "");
static_assert((std::is_same<decltype(vsnprintf(cp,0," ",va)), int>::value), "");
static_assert((std::is_same<decltype(vsprintf(cp," ",va)), int>::value), "");
static_assert((std::is_same<decltype(vsscanf("","",va)), int>::value), "");
static_assert((std::is_same<decltype(fgetc(fp)), int>::value), "");
static_assert((std::is_same<decltype(fgets(cp,0,fp)), char*>::value), "");
static_assert((std::is_same<decltype(fputc(0,fp)), int>::value), "");
static_assert((std::is_same<decltype(fputs("",fp)), int>::value), "");
static_assert((std::is_same<decltype(getc(fp)), int>::value), "");
static_assert((std::is_same<decltype(getchar()), int>::value), "");
#if TEST_STD_VER < 14
static_assert((std::is_same<decltype(gets(cp)), char*>::value), "");
#endif
static_assert((std::is_same<decltype(putc(0,fp)), int>::value), "");
static_assert((std::is_same<decltype(putchar(0)), int>::value), "");
static_assert((std::is_same<decltype(puts("")), int>::value), "");
static_assert((std::is_same<decltype(ungetc(0,fp)), int>::value), "");
static_assert((std::is_same<decltype(fread((void*)0,0,0,fp)), size_t>::value), "");
static_assert((std::is_same<decltype(fwrite((const void*)arr,1,0,fp)), size_t>::value), "");
static_assert((std::is_same<decltype(fgetpos(fp, &fpos)), int>::value), "");
static_assert((std::is_same<decltype(fseek(fp, 0,0)), int>::value), "");
static_assert((std::is_same<decltype(fsetpos(fp, &fpos)), int>::value), "");
static_assert((std::is_same<decltype(ftell(fp)), long>::value), "");
static_assert((std::is_same<decltype(rewind(fp)), void>::value), "");
static_assert((std::is_same<decltype(clearerr(fp)), void>::value), "");
static_assert((std::is_same<decltype(feof(fp)), int>::value), "");
static_assert((std::is_same<decltype(ferror(fp)), int>::value), "");
static_assert((std::is_same<decltype(perror("")), void>::value), "");
return 0;
}
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