From: Paul Eggert <eggert@cs.ucla.edu>
Date: Fri, 19 May 2017 03:27:11 +0000 (-0700)
Subject: Port --enable-gcc-warnings to clang 3.9.1
X-Git-Tag: emacs-26.0.90~521^2~368
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=af4ac3dc852647e5ea41be5ffc387be591978aee;p=emacs.git

Port --enable-gcc-warnings to clang 3.9.1

* configure.ac (WERROR_CFLAGS): Omit -Wdouble-promotion if clang.
Problem reported by Philipp Stephani in:
http://lists.gnu.org/archive/html/emacs-devel/2017-05/msg00495.html
---

diff --git a/configure.ac b/configure.ac
index 34b75a768bf..03542a6b1c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -963,6 +963,7 @@ AS_IF([test $gl_gcc_warnings = no],
 
   if test $emacs_cv_clang = yes; then
     nw="$nw -Wcast-align"
+    nw="$nw -Wdouble-promotion"
   fi
 
   # This causes too much noise in the MinGW build