glibc/sysdeps/alpha/elf/configure.in

GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/alpha/elf.

if test "$usetls" != no; then
# Check for support of thread-local storage handling in assembler and
# linker.
AC_CACHE_CHECK(for Alpha TLS support, libc_cv_alpha_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:
	.set nomacro
	ldq	$27, __tls_get_addr($29)	!literal!1
	ldq	$16, a($29)			!tlsgd!1
	jsr	$26, ($27), __tls_get_addr	!lituse_tlsgd!1

	jsr	$26, ($27), __tls_get_addr	!lituse_tlsldm!2
	ldq	$27, __tls_get_addr($29)	!literal!2
	ldq	$16, b($29)			!tlsldm!2

	ldq	$16, c($29)			!tlsgd
	ldq	$16, d($29)			!tlsldm

	ldq	$16, e($29)			!tlsgd!3
	ldq	$16, f($29)			!tlsldm!4

	ldq	$16, g($29)			!gotdtprel
	ldah	$16, h($31)			!dtprelhi
	lda	$16, i($16)			!dtprello
	lda	$16, j($31)			!dtprel

	ldq	$16, k($29)			!gottprel
	ldah	$16, l($31)			!tprelhi
	lda	$16, m($16)			!tprello
	lda	$16, n($31)			!tprel
EOF
dnl
if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
  libc_cv_alpha_tls=yes
else
  libc_cv_alpha_tls=no
fi
rm -f conftest*])
if test $libc_cv_alpha_tls = yes; then
  AC_DEFINE(HAVE_TLS_SUPPORT)
fi
fi

AC_CACHE_CHECK(for GP relative module local relocs, libc_cv_alpha_hidden_gprel, [dnl
cat > conftest.c <<\EOF
static int bar;
int baz __attribute__((visibility("hidden")));

int foo (void)
{
  return bar + baz;
}
EOF
dnl

libc_cv_alpha_hidden_gprel=no
if AC_TRY_COMMAND(${CC-cc} -S $CFLAGS -O2 -fpic conftest.c 1>&AS_MESSAGE_LOG_FD); then
  if grep -q 'bar.*!gprel' conftest.s \
     && grep -q 'baz.*!gprel' conftest.s \
     && ! grep -q 'bar.*!literal' conftest.s \
     && ! grep -q 'baz.*!literal' conftest.s; then
    libc_cv_alpha_hidden_gprel=yes
  fi
fi
rm -f conftest*])
if test $libc_cv_alpha_hidden_gprel = yes; then
  AC_DEFINE(PI_STATIC_AND_HIDDEN)
fi