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-rw-r--r--configure.ac20
1 files changed, 20 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 123f0d26ee..33bcd62180 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1412,6 +1412,26 @@ elif test "$libc_cv_ssp" = "yes"; then
fi
AC_SUBST(stack_protector)
+AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
+[dnl
+cat > conftest.c <<EOF
+__thread int i;
+void foo (void)
+{
+ i = 10;
+}
+EOF
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
+ conftest.c 1>&AS_MESSAGE_LOG_FD])
+then
+ libc_cv_mtls_dialect_gnu2=yes
+else
+ libc_cv_mtls_dialect_gnu2=no
+fi
+rm -f conftest*])
+AC_SUBST(libc_cv_mtls_dialect_gnu2)
+LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
+
AC_CACHE_CHECK(whether cc puts quotes around section names,
libc_cv_have_section_quotes,
[cat > conftest.c <<EOF