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?