about summary refs log tree commit diff
path: root/sysdeps/i386/elf/configure.in
blob: d7e17045403a9266a51340b4967f23fb7356b7d8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
sinclude(./aclocal.m4)dnl Autoconf lossage
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/unix/sysv/linux.

# Check for support of thread-local storage handling in assembler and
# linker.
AC_CACHE_CHECK(for i386 TLS support, libc_cv_386_tls, [dnl
cat > conftest.s <<\EOF
	.section ".tdata", "awT", @progbits
foo:	.long	1
	.section ".tbss", "awT", @nobits
	.comm	bar,4,4
	.text
baz:	leal	bar@TLSLDM(%ebx), %eax
	leal	bar@DTPOFF(%eax), %edx
	subl	foo@GOTTPOFF(%edx), %eax
	subl	$bar@TPOFF, %eax
EOF
dnl
if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s 1>&AC_FD_CC); then
  libc_cv_386_tls=yes
else
  libc_cv_386_tls=no
fi
rm -f conftest*])
if test $libc_cv_386_tls = yes; then
  AC_DEFINE(HAVE_TLS_SUPPORT)
fi