http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45879
Summary: strcpy returns unexpected result Product: gcc Version: 4.4.3 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassig...@gcc.gnu.org ReportedBy: jachrist...@gmail.com This is my first bug report, I am not sure I have assigned the correct category to this and whether this is actually a bug or change in philosophy. My code was last compiled on GCC 4.1.2 and many other previous versions of the GCC compilers over the last 8 years. Are moving to a 64bit machine and this code that has worked for years, now gives a strange result. gcc -v Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.3-4ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i486 --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 4.4.3 (Ubuntu 4.4.3-4ubuntu5) A test case is as follows , built with gcc -osample sample.c #include <stdio.h> #include <string.h> int main(int argc, char *argv[]) { char data[20]; strcpy(data, "2010-1004"); strcpy(&data[4], &data[5]); printf("%s\n", data); return 0; } The expected return in data is "20101004", GCC 4.4.3 is returning "20101044" I have no explanation for the unexpected result. Thanks, John