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-rw-r--r--sysdeps/ieee754/ldbl-opt/configure.in19
1 files changed, 19 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-opt/configure.in b/sysdeps/ieee754/ldbl-opt/configure.in
new file mode 100644
index 0000000000..a77fadd1c4
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-opt/configure.in
@@ -0,0 +1,19 @@
+sinclude(./aclocal.m4)dnl Autoconf lossage
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/ieee754/ldbl-opt/.
+
+AC_CACHE_CHECK(whether $CC $CFLAGS supports -mlong-double-128,
+	       libc_cv_mlong_double_128, [dnl
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -mlong-double-128"
+AC_TRY_COMPILE(, [
+#ifndef __LONG_DOUBLE_128__
+# error "compiler did not predefine __LONG_DOUBLE_128__ as expected"
+#endif
+long double foobar (long double x) { return x; }],
+	       libc_cv_mlong_double_128=yes,
+	       libc_cv_mlong_double_128=no)
+CFLAGS="$save_CFLAGS"])
+if test "$libc_cv_mlong_double_128" = no; then
+  AC_MSG_ERROR([this configuration requires -mlong-double-128 support])
+fi