On Wed, Jul 5, 2017 at 8:53 AM, Szabolcs Nagy <szabolcs.n...@arm.com> wrote: > On 05/07/17 16:38, H.J. Lu wrote: >> On x86-64, __tls_get_addr has to realigns stack so that binaries compiled by >> GCCs older than GCC 4.9.4: >> >> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066 >> >> continue to work even if vector instructions are used by functions called >> from __tls_get_addr, which assumes 16-byte stack alignment as specified >> by x86-64 psABI. >> >> We are considering to add an alternative interface, ___tls_get_addr, to >> glibc, which doesn't realign stack. Compilers, which properly align stack >> for TLS, call generate call to ___tls_get_addr, instead of __tls_get_addr, >> if ___tls_get_addr is available. >> >> Any comments? >> >> > > what happens when new compiler generating the new symbol > is used with old glibc? >
Compiler shouldn't do that. -- H.J.
