Consider following program. I think it shouldn't print anything, but when compiled with gcc-4.0.? it prints "arr==&arr".
The idea came from comp.lang.c faq question 6.12 (http://www.eskimo.com/~scs/C-faq/q6.12.html) #include <stdio.h> int main(int argc,char** argv) { int arr[1]; int (*bar)[1]=&arr; if ((void*)arr==(void*)&arr) { printf("arr==&arr\n"); } if (bar!=&arr) { printf("&arr!=&arr\n"); } return 0; } $ gcc -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,java,f95,objc,ada,treelang --prefix=/usr --with-gxx-include-dir=/usr/include/c++/4.0.2 --enable-shared --with-system-zlib --libexecdir=/usr/lib --enable-nls --without-included-gettext --enable-threads=posix --program-suffix=-4.0 --enable-__cxa_atexit --enable-libstdcxx-allocator=mt --enable-clocale=gnu --enable-libstdcxx-debug --enable-java-gc=boehm --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-4.0-1.4.2.0/jre --enable-mpfr --disable-werror --enable-checking=release i486-linux-gnu Thread model: posix gcc version 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu9) -- Summary: if arr is an array, arr == &arr Product: gcc Version: 4.0.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pablo at ipi dot fi http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25326
