#379 Compilation error in math functions (C++)

[maki]

The following error occurs when using g++.

---

[mingw-w64 version]
trunk r6470

[test code - test.cpp]

#include <cmath>
int main ()
{
  float f; isnan(f);
  return 0;
}

[command line]
g++ test.cpp

[error log]

In file included from d:\dev\msys32\mingw\i686-w64-mingw32\include\c++\4.8.2\cmath:44:0,
                 from test.cpp:1:
test.cpp: In function 'int main()':
test.cpp:5:10: error: expected primary-expression before '__typeof__'
 float f; isnan(f);
          ^
test.cpp:5:10: error: expected primary-expression before 'double'
 float f; isnan(f);
          ^
test.cpp:5:10: error: '__builtin_types_compatible_p' was not declared in this scope
 float f; isnan(f);
          ^
test.cpp:5:10: error: expected primary-expression before '__typeof__'
 float f; isnan(f);
          ^
test.cpp:5:10: error: expected primary-expression before 'float'
 float f; isnan(f);
          ^
test.cpp:5:10: error: expected primary-expression before '__typeof__'
 float f; isnan(f);
          ^
test.cpp:5:10: error: expected primary-expression before 'long'
 float f; isnan(f);
          ^
test.cpp:5:10: error: '__builtin_choose_expr' was not declared in this scope
 float f; isnan(f);
          ^
test.cpp:5:10: error: '__builtin_choose_expr' was not declared in this scope
 float f; isnan(f);
          ^
test.cpp:5:10: error: redeclaration of '<typeprefixerror>__builtin_choose_expr'
test.cpp:5:10: note: previous declaration '<typeprefixerror>__builtin_choose_expr'
 float f; isnan(f);
          ^
test.cpp:5:10: error: '__builtin_choose_expr' was not declared in this scope
 float f; isnan(f);
          ^
test.cpp:5:10: error: redeclaration of '<typeprefixerror>__builtin_choose_expr'
test.cpp:5:10: note: previous declaration '<typeprefixerror>__builtin_choose_expr'
 float f; isnan(f);
          ^

---

This error was ocurred in configure script of llvm-3.4.
Please confirm attached files.

Thank you.

[Erik van Pienbroek]

Issue also happens on the Fedora MinGW toolchain (using recent mingw-w64 trunk snapshots): https://bugzilla.redhat.com/show_bug.cgi?id=1061443
MinGW-w64 Commit r6463 is the likely culprit of this issue as it changed the implementation of various macros like isnan and signbit: https://sourceforge.net/p/mingw-w64/code/6463/

[Kai Tietz]

Issue fixed on trunk at rev. 6476 & rev. 6477