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-rw-r--r--configure.in16
1 files changed, 16 insertions, 0 deletions
diff --git a/configure.in b/configure.in
index c115be5..8983031 100644
--- a/configure.in
+++ b/configure.in
@@ -1624,6 +1624,22 @@ if test "$libc_cv_gcc___thread" = yes; then
AC_DEFINE(HAVE___THREAD)
fi
+if test "$libc_cv_gcc___thread" = yes; then
+ dnl Check whether the compiler supports the tls_model attribute.
+ AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
+ cat > conftest.c <<\EOF
+extern __thread int a __attribute__((tls_model ("initial-exec")));
+EOF
+ if AC_TRY_COMMAND([${CC-cc} $CFLAGS -S -Werror conftest.c >&AC_FD_CC]); then
+ libc_cv_gcc_tls_model_attr=yes
+ else
+ libc_cv_gcc_tls_model_attr=no
+ fi
+ rm -f conftest*])
+ if test "$libc_cv_gcc_tls_model_attr" = yes; then
+ AC_DEFINE(HAVE_TLS_MODEL_ATTRIBUTE)
+ fi
+fi
dnl Check whether we have the gd library available.
AC_MSG_CHECKING(for libgd)