diff options
Diffstat (limited to 'sysdeps/i386/configure.in')
| -rw-r--r-- | sysdeps/i386/configure.in | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/sysdeps/i386/configure.in b/sysdeps/i386/configure.in index 7b4879d54a..b9e6f9eef4 100644 --- a/sysdeps/i386/configure.in +++ b/sysdeps/i386/configure.in @@ -85,3 +85,37 @@ LIBC_TRY_CC_OPTION([-mno-vzeroupper], [libc_cv_cc_novzeroupper=yes], [libc_cv_cc_novzeroupper=no]) ]) + +# 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 + .globl foo +foo: .long 1 + .section ".tbss", "awT", @nobits + .globl bar +bar: .skip 4 + .text +baz: leal bar@TLSLDM(%ebx), %eax + leal bar@DTPOFF(%eax), %edx + subl foo@GOTTPOFF(%edx), %eax + subl $bar@TPOFF, %eax + movl foo@GOTNTPOFF(%edx), %ecx + movl %gs:(%ecx), %eax + movl %gs:bar@NTPOFF, %eax +EOF +dnl +if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then + libc_cv_386_tls=yes +else + libc_cv_386_tls=no +fi +rm -f conftest*]) +if test $libc_cv_386_tls = no; then + AC_MSG_ERROR([the assembler must support TLS]) +fi + +dnl It is always possible to access static and hidden symbols in an +dnl position independent way. +AC_DEFINE(PI_STATIC_AND_HIDDEN) |