From a9cfb33b6c82a99e852a06de2127ffaea85bc212 Mon Sep 17 00:00:00 2001
From: Jon Beniston <jon@beniston.com>
Date: Fri, 31 Aug 2018 17:44:33 +0100
Subject: Add --disable-newlib-fno-builtin to allow compilation without
 -fno-builtin for smaller and faster code.

---
 newlib/configure.host | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'newlib/configure.host')

diff --git a/newlib/configure.host b/newlib/configure.host
index bfa51669d..7e9336a0a 100644
--- a/newlib/configure.host
+++ b/newlib/configure.host
@@ -28,6 +28,7 @@
 #   newlib_io_long_long --enable-newlib-io-long-long ("yes", "no", "")
 #   newlib_io_long_double --enable-newlib-io-long-double ("yes", "no", "")
 #   newlib_global_stdio_streams --enable-global-stdio-streams ("yes", "no, "")
+#   newlib_fno_builtin  --disable-newlib-fno-builtin ("yes", "no, "")
 
 # It sets the following shell variables:
 #   newlib_cflags	Special CFLAGS to use when building
@@ -91,6 +92,19 @@ case "${target_optspace}:${host}" in
     ;;
 esac
 
+case "${newlib_fno_builtin}:${host}" in
+  yes:*)
+    newlib_cflags="${newlib_cflags} -fno-builtin"
+    ;;
+  no:*)
+    newlib_cflags="${newlib_cflags}"
+    ;;
+  *:*)
+    # For now, all targets default to using -fno-builtin until tested without
+    newlib_cflags="${newlib_cflags} -fno-builtin"
+    ;;
+esac
+
 # Get the source directories to use for the CPU type.
 # machine_dir should supply CPU dependent routines, such as setjmp.
 # newlib_cflags is passed to gcc when compiling.
-- 
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