| GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory. |
| # Local configure fragment for sysdeps/x86_64/elf. |
| |
| if test "$usetls" != no; then |
| # Check for support of thread-local storage handling in assembler and linker. |
| AC_CACHE_CHECK(for x86-64 TLS support, libc_cv_x86_64_tls, [dnl |
| cat > conftest.s <<\EOF |
| .section ".tdata", "awT", @progbits |
| .globl foo |
| foo: .quad 1 |
| .section ".tbss", "awT", @nobits |
| .globl bar |
| bar: .skip 8 |
| .text |
| baz: leaq bar@TLSLD(%rip), %rdi |
| leaq bar@DTPOFF(%rax), %rcx |
| addq foo@GOTTPOFF(%rip), %rax |
| movq $bar@TPOFF, %rdx |
| EOF |
| dnl |
| if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then |
| libc_cv_x86_64_tls=yes |
| else |
| libc_cv_x86_64_tls=no |
| fi |
| rm -f conftest*]) |
| if test $libc_cv_x86_64_tls = yes; then |
| AC_DEFINE(HAVE_TLS_SUPPORT) |
| fi |
| fi |
| |
| dnl It is always possible to access static and hidden symbols in an |
| dnl position independent way. |
| AC_DEFINE(PI_STATIC_AND_HIDDEN) |
