Potential Bug in GCC5?

[Yubin Ruan <ablacktshirt at gmail dot com>]

Hi,
I don't know whether this bug has been reported(I have check GCC Bugzillia
though) or has been resolved:

This program:

    #include <stdio.h>
    int main()
    {
      char a = 'a';
      printf("Size of char : %d\n",sizeof(a));
      printf("Size of char : %d\n",sizeof('a'));
      return 0;
    }

when compiled with:

    gcc -Wall testgcc.c -o testgcc -fexec-charset=utf-16

will triggers GCC's bug report reminder:

  ...
  internal compiler error: character 0xa is not unibyte in execution character set
  ...
  Please submit a full bug report...

I think the problem comes with the "-fexec-character=utf-16" flag. And my GCC
version is (compiling with "gcc -v -Wall testgcc.c -o testgcc -fexec-charset=utf-16")

    Using built-in specs.
    COLLECT_GCC=gcc
    COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
    Target: x86_64-linux-gnu
    Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.4.0-6ubuntu1~16.04.4' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --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-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
    Thread model: posix
    gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 
    COLLECT_GCC_OPTIONS='-fno-common' '-v' '-Wall' '-o' 'testgcc' '-fexec-charset=utf-16' '-mtune=generic' '-march=x86-64'
     /usr/lib/gcc/x86_64-linux-gnu/5/cc1 -quiet -v -imultiarch x86_64-linux-gnu testgcc.c -quiet -dumpbase testgcc.c -mtune=generic -march=x86-64 -auxbase testgcc -Wall -version -fno-common -fexec-charset=utf-16 -fstack-protector-strong -Wformat-security -o /tmp/ccVA6bpI.s
    GNU C11 (Ubuntu 5.4.0-6ubuntu1~16.04.4) version 5.4.0 20160609 (x86_64-linux-gnu)
    	compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3
    GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
    ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
    ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/5/../../../../x86_64-linux-gnu/include"
    #include "..." search starts here:
    #include <...> search starts here:
     /usr/lib/gcc/x86_64-linux-gnu/5/include
     /usr/local/include
     /usr/lib/gcc/x86_64-linux-gnu/5/include-fixed
     /usr/include/x86_64-linux-gnu
     /usr/include
    End of search list.
    GNU C11 (Ubuntu 5.4.0-6ubuntu1~16.04.4) version 5.4.0 20160609 (x86_64-linux-gnu)
    	compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3
    GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
    Compiler executable checksum: 78b6f8b2ed219a71c67c16db887e4800
    testgcc.c: In function ‘main’:
    testgcc.c:4:12: warning: multi-character character constant [-Wmultichar]
       char a = 'a';
                ^
    testgcc.c:4:12: warning: overflow in implicit constant conversion [-Woverflow]
    testgcc.c:5:10: warning: embedded ‘\0’ in format [-Wformat-contains-nul]
       printf("Size of char : %d\n",sizeof(a));
              ^
    testgcc.c:5:10: warning: too many arguments for format [-Wformat-extra-args]
    testgcc.c:6:39: warning: multi-character character constant [-Wmultichar]
       printf("Size of char : %d\n",sizeof('a'));
                                           ^
    testgcc.c:6:10: warning: embedded ‘\0’ in format [-Wformat-contains-nul]
       printf("Size of char : %d\n",sizeof('a'));
              ^
    testgcc.c:6:10: warning: too many arguments for format [-Wformat-extra-args]
    testgcc.c:8:0: internal compiler error: character 0xa is not unibyte in execution character set
     }
     ^
    Please submit a full bug report,
    with preprocessed source if appropriate.
    See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.

Is it appropriate for me to create a bug report on GCC's bugzillia?

--
Yubin