[RTEMS Project] #3012: Global C++ IO streams are broken (cout, cin, cerr)

[RTEMS trac]

#3012: Global C++ IO streams are broken (cout, cin, cerr)
-----------------------------+-------------------------
 Reporter:  Sebastian Huber  |      Owner:  Chris Johns
     Type:  defect           |     Status:  assigned
 Priority:  normal           |  Milestone:  Indefinite
Component:  GCC              |    Version:  4.12
 Severity:  normal           |   Keywords:
-----------------------------+-------------------------
 The global C++ IO stream objects are initialized here

 https://gcc.gnu.org/viewcvs/gcc/trunk/libstdc%2B%2B-v3/src/c%2B%2B98/ios_init.cc?view=markup#l85

 via a placement new. The "stdout" etc. is thread-local in Newlib
 {{{
 #define    stdout  (_REENT->_stdout)
 }}}

 Using this for a global object like std::cout is quite broken. Which FILE
 object should be used instead? Potential fix:
 {{{
 diff --git a/libstdc++-v3/src/c++98/ios_init.cc
 b/libstdc++-v3/src/c++98/ios_init.cc
 index c5bcc83..7470c44 100644
 --- a/libstdc++-v3/src/c++98/ios_init.cc
 +++ b/libstdc++-v3/src/c++98/ios_init.cc
 @@ -33,6 +33,15 @@
  #include <ext/stdio_filebuf.h>
  #include <ext/stdio_sync_filebuf.h>

 +#ifdef __rtems__
 +#undef stdout
 +#undef stdin
 +#undef stderr
 +#define stdout (_GLOBAL_REENT->_stdout)
 +#define stdin (_GLOBAL_REENT->_stdout)
 +#define stderr (_GLOBAL_REENT->_stdout)
 +#endif
 +
  namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden)
  {
    using namespace __gnu_cxx;
 }}}
 {{{
 diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
 index 83d3dc5..7d50951 100644
 --- a/newlib/libc/stdio/findfp.c
 +++ b/newlib/libc/stdio/findfp.c
 @@ -259,6 +259,12 @@ _DEFUN(__sinit, (s),
    __sinit_lock_release ();
  }

 +static void __attribute__((__constructor__(0)))
 +_global_reent_init(void)
 +{
 +  __sinit (_GLOBAL_REENT);
 +}
 +
  #ifndef __SINGLE_THREAD__

  __LOCK_INIT_RECURSIVE(static, __sfp_recursive_mutex);
 }}}

--
Ticket URL: <http://devel.rtems.org/ticket/3012>
RTEMS Project <http://www.rtems.org/>
RTEMS Project