[Bug c/71914] New: Name 'DOMAIN' is blocked when including math.h

[henad221 at student dot liu.se]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71914

            Bug ID: 71914
           Summary: Name 'DOMAIN' is blocked when including math.h
           Product: gcc
           Version: 4.8.5
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: henad221 at student dot liu.se
  Target Milestone: ---

#include <math.h>
#include <stdio.h>

int DOMAIN = 3;

int main() {
  printf("%d\n", DOMAIN);
  return 0;
}

Compiled with:

gcc -v domain.cpp

Produces:

gcc -v domain.cpp 
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.8/lto-wrapper
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.8.5-2ubuntu1~14.04.1' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-i386/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-i386
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-i386
--with-arch-directory=i386 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-targets=all --enable-multiarch --disable-werror
--with-arch-32=i686 --with-multilib-list=m32,m64,mx32 --with-tune=generic
--enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu
--target=i686-linux-gnu
Thread model: posix
gcc version 4.8.5 (Ubuntu 4.8.5-2ubuntu1~14.04.1) 
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=i686'
 /usr/lib/gcc/i686-linux-gnu/4.8/cc1plus -quiet -v -imultiarch i386-linux-gnu
-D_GNU_SOURCE domain.cpp -quiet -dumpbase domain.cpp -mtune=generic -march=i686
-auxbase domain -version -fstack-protector -Wformat -Wformat-security -o
/tmp/ccDxzNcb.s
GNU C++ (Ubuntu 4.8.5-2ubuntu1~14.04.1) version 4.8.5 (i686-linux-gnu)
        compiled by GNU C version 4.8.5, GMP version 5.1.3, MPFR version 3.1.3,
MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring duplicate directory "/usr/include/i386-linux-gnu/c++/4.8"
ignoring nonexistent directory "/usr/local/include/i386-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i686-linux-gnu/4.8/../../../../i686-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/dyknowaccount/ros_catkin_ws/install_isolated/include
 /usr/include/c++/4.8
 /usr/include/i386-linux-gnu/c++/4.8
 /usr/include/c++/4.8/backward
 /usr/lib/gcc/i686-linux-gnu/4.8/include
 /usr/local/include
 /usr/lib/gcc/i686-linux-gnu/4.8/include-fixed
 /usr/include/i386-linux-gnu
 /usr/include
End of search list.
GNU C++ (Ubuntu 4.8.5-2ubuntu1~14.04.1) version 4.8.5 (i686-linux-gnu)
        compiled by GNU C version 4.8.5, GMP version 5.1.3, MPFR version 3.1.3,
MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 0603886523ce76985a8d2b2a7d22cd38
In file included from domain.cpp:1:0:
domain.cpp:4:5: error: expected unqualified-id before numeric constant
 int DOMAIN = 3;
     ^