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Description of problem:
We are porting our compilers to linux, and trying to use
the glibc headers (where we can) in combination with
our compiler (which is NOT g++).

Here is an issue we discovered:

  /usr/include/bits/mathcalls.h:277 has this

277: #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || \
     defined __USE_ISOC99
    __BEGIN_NAMESPACE_C99
    ...
    #endif

later (line 

300: #ifdef __USE_ISOC99
...
356: __END_NAMESPACE_C99
...
    #endif

 
It's a bad idea to have an open-scope statement protected
by different macros than the corresponding close.


At the top of mathcalls.h the NAMESPACE macros are closely nested
inside the #ifdefs.  But later in the file, the NAMESPACE macros
start to get separated by more distance, and eventually (around line 300)
they are covered by different #ifdef macros, which can sometimes
result in mismatched open and close braces. 

I can't see an easy suggestion for which way to group the
various guards in this file, but they need to be made
consistent somehow.


Version-Release number of selected component (if applicable):
glibc-headers-2.3.4-2

How reproducible:
Always

Steps to Reproduce:
You can see the bug by inspecting the header file.

% more t.cc

// This is turned on by #include <cassert> (for example)
// as opposed to #include <assert.h>
#define _GLIBCPP_USE_NAMESPACES 1

#include <math.h>

template<class T>  class foo {
   T bar;
};
foo<int> ff;

int main()
{
  return 0;
}

% g++ -U_GNU_SOURCE -c t.cc
t.cc:8: error: template with C linkage
t.cc:16: error: expected `}' at end of input
t.cc:16: error: expected `}' at end of input
t.cc:16: error: expected `}' at end of input



Additional info: