template<int sz> struct xxx_t { char foo[sz]; char bar[0]; };
int main(int argc, char *argv[]) { xxx_t<0> xyz; } gcc -Wall foo.cpp -o foo foo.cpp: In instantiation of xxx_t<0>: foo.cpp:9: instantiated from here foo.cpp:3: error: creating array with size zero (0) foo.cpp: In function int main(int, char**): foo.cpp:9: warning: unused variable xyz Using built-in specs. Target: i386-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man -- infodir=/usr/share/info --enable-shared --enable-threads=posix --enable- checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind- exceptions --enable-libgcj-multifile --enable- languages=c,c++,objc,java,f95,ada --enable-java-awt=gtk --with-java- home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --host=i386-redhat-linux Thread model: posix gcc version 4.0.0 20050519 (Red Hat 4.0.0-8) explicit zero sized array 'bar' compiles correctly, the template parameter 'sz' causes a compilation error when 0 is passed. -- Summary: array dimensioned to zero via template parameter yields parse error Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: guido at grumpy-cat dot com CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22243