glibc/sysdeps/powerpc/powerpc64/configure.in

GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/powerpc/powerpc64.

# The Aix ld uses global .symbol_names instead of symbol_names
# and unfortunately early Linux PPC64 linkers use it as well.
AC_CACHE_CHECK(for support for omitting dot symbols,
libc_cv_omit_dot_syms, [dnl
libc_cv_omit_dot_syms=no
echo 'void foo (void) {}' > conftest.c
if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
  if grep -w '\.foo' conftest.s > /dev/null; then
    :
  else
    libc_cv_omit_dot_syms=yes
  fi
fi
rm -f conftest.c conftest.s
])
if test x$libc_cv_omit_dot_syms != xyes; then
  AC_DEFINE(HAVE_ASM_GLOBAL_DOT_NAME)
fi

AC_CACHE_CHECK(for linker support for overlapping .opd entries,
libc_cv_overlapping_opd, [dnl
libc_cv_overlapping_opd=no
echo 'void foo (void) {}' > conftest.c
if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
changequote(,)dnl
  if grep '\.TOC\.@tocbase' conftest.s > /dev/null; then
    if grep '\.TOC\.@tocbase[ 	]*,[ 	]*0' conftest.s > /dev/null; then
      :
    else
      libc_cv_overlapping_opd=yes
    fi
  fi
changequote([,])dnl
fi
rm -f conftest.c conftest.s
])
if test x$libc_cv_overlapping_opd = xyes; then
  AC_DEFINE(USE_PPC64_OVERLAPPING_OPD)
fi

# Check for support of thread-local storage handling in assembler and
# linker.
AC_CACHE_CHECK(for powerpc64 TLS support, libc_cv_powerpc64_tls, [dnl
cat > conftest.s <<\EOF
	.section ".tdata","awT",@progbits
x:      .quad   1
x1:     .quad   1
x2:     .quad   1
x3:     .quad   1
x4:     .long   1
	.section ".toc","aw"
.LC0:
	.quad	x@dtpmod
	.quad	x@dtprel
.LC1:
	.quad	x1@dtpmod
	.quad	0
.LC2:
	.quad	x@tprel
	.text
	addi    3,2,x@got@tlsgd
	addi    3,2,.LC0@toc
	addi    3,2,x1@got@tlsld
	addi    9,3,x1@dtprel
	addis   9,3,x2@dtprel@ha
	addi    9,9,x2@dtprel@l
	ld      9,x3@got@dtprel(2)
	addi    3,2,.LC0@toc
	lwz     0,x1@dtprel(3)
	ld      0,x1@dtprel(3)
	addis   9,3,x2@dtprel@ha
	lwz     0,x2@dtprel@l(9)
	ld      0,x2@dtprel@l(9)
	ld      9,x3@got@dtprel(2)
	ld      9,x@got@tprel(2)
	add     9,9,x@tls
	ld      9,.LC2@toc(2)
	add     9,9,.LC2@tls
	addi    9,13,x1@tprel
	addis   9,13,x2@tprel@ha
	addi    9,9,x2@tprel@l
EOF
dnl
if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
  libc_cv_powerpc64_tls=yes
else
  libc_cv_powerpc64_tls=no
fi
rm -f conftest*])
if test $libc_cv_powerpc64_tls = no; then
  AC_MSG_ERROR([the assembler must support TLS])
fi