_RWSTD_NO_NATIVE_IO doesn't disable native I/O
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Key: STDCXX-1049
URL: https://issues.apache.org/jira/browse/STDCXX-1049
Project: C++ Standard Library
Issue Type: Bug
Components: 27. Input/Output
Affects Versions: 4.2.1
Environment: non-POSIX
Reporter: Martin Sebor
Assignee: Martin Sebor
Priority: Minor
Fix For: 4.2.2
Quoting from the thread [Re: stdcxx and
POSIX|http://mail-archives.apache.org/mod_mbox/stdcxx-dev/201006.mbox/%3cdee44afe682197449410588eb783a51403635a4...@bungle.emea.arm.com%3e]
{quote}
We are trying to use stdcxx library on a environment where POSIX
environment is not available (and it is not a win32 platform), as
a continuation of RoguWave library. We would like to know if
stdcxx supports it. We have found some occurrences of POSIX
headers and symbols in {{file.cpp}} and {{iostream.cpp}}. Although
run-time behavior for iostreams can be changed by passing
unofficial extension to openmode {{\_RWSTD_IOS_STDIO}}, but the POSIX
symbols are still present, so the compilation will fail. There is
{{_RWSTD_NO_NATIVE_IO}} as the {{README}} file says:
{code}
o _RWSTD_NO_NATIVE_IO
[lib, over]
#defined to force file streams to use the facilities of libc
stdio as opposed to the POSIX I/O interface.
{code}
and here:
{code}
#ifndef _RWSTD_NO_NATIVE_IO
# define _RWSTD_INVALID_FILE -1
# define _RWSTD_INVALID_OPENMODE -1
#else
# define _RWSTD_INVALID_FILE (FILE*)0
# define _RWSTD_INVALID_OPENMODE 0
#endif // _RWSTD_NO_NATIVE_IO
{code}
but that does not to fix the problem at all.
On other side, the initialization routine ({{iostream.cpp}}) uses POSIX
file descriptors and posix calls for std console streams ({{cout}},
{{cin}}, {{cerr}} objects and wchar equivalents), in this case there is no
other way than patching library to replace it with {{stdio.h}} functionality.
To reproduce the problem, on the system where POSIX is not present:
{code}
#include <iostream>
int main() { return 0; }
{code}
Will fail, because we could not compile it, even if we compiled it
excluding files that use POSIX we will get linking errors. Is
there any chance of solving it in your upstream? We know about the
status of Apache STL.
{quote}
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