http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54580
Bug #: 54580 Summary: 64-bit pointer to int cast fails Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: russell.wall...@gmail.com int main() { return (int)""; } a.cc: In function 'int main()': a.cc:1:26: error: cast from 'const char*' to 'int' loses precision [-fpermissive] This should not be a warning let alone an error, because an explicit cast was used (though it would do no harm to retain it as a warning under -Wextra if so desired). Note that the -fpermissive workaround suggested in the message won't be a solution in all cases because this is going to trigger on code that was originally written - along with its build scripts - on 32-bit systems; in many cases the author of the code will no longer be available to fix the problem. Using built-in specs. COLLECT_GCC=x86_64-w64-mingw32-g++ COLLECT_LTO_WRAPPER=c:/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/4.7.0/lto-wrapper.exe Target: x86_64-w64-mingw32 Configured with: ../../../build/gcc/src/configure --target=x86_64-w64-mingw32 --prefix=/c/bb/vista64-mingw32/mingw-x86-x86_64/build/build/root --with-sysroot=/c/bb/vista64-mingw32/mingw-x86-x86_64/build/build/root --enable-languages=all,obj-c++ --enable-fully-dynamic-string --disable-multilib Thread model: win32 gcc version 4.7.0 20111220 (experimental) (GCC)