On 22/07/14 05:01 AM, Allan McRae wrote:
On 22/07/14 07:41, Daniel Micay wrote:
A `pie` option is added for wrapping C and C++ compilers and passing the correct options for building position independent executables. PIE is required for full address space layout optimization (ASLR) and there is little to no benefit from ASLR without it since global ELF tables (GOT/PLT) and application code are at known locations.
A wrapper script is required in order to pass the correct flags for executables without changing the flags for libraries. It adds `-pie` when linking (no `-c` switch) if `-static` or `-shared` are not passed, and `-fPIE` whenever `-fPIC` is not already there. This technique comes from the Debian hardening wrappers.
Position independent code is expensive on i686, so it's only enabled by default on x86_64 where the cost is negligible. It can be enabled on a package-by-package basis on i686. The same cost already exists for any code in a dynamic library.
Why should this be in makepkg? Just like Debian this should be a distribution build system integration rather than in the package manager.
Allan
I'll add a pie-wrapper package to [community] and ask for it to be included in base-devel on arch-dev-public instead of this.