From bb931195fe780bb63e3d57d0742abad1d2128424 Mon Sep 17 00:00:00 2001
From: Thomas Schwinge <thomas@codesourcery.com>
Date: Fri, 25 Jan 2013 12:33:19 +0100
Subject: configure: Default to CPP="$CC -E" unless overridden.

---
 configure.in | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index 4cfa36d..2c50d09 100644
--- a/configure.in
+++ b/configure.in
@@ -17,6 +17,23 @@ AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
   [m4_divert_text([DEFAULTS],
     [ac_includes_default='/* none */'])])
 
+# We require GCC, and by default use its preprocessor.  Override AC_PROG_CPP
+# here to work around the Autoconf issue discussed in
+# <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
+AC_DEFUN([AC_PROG_CPP],
+[AC_REQUIRE([AC_PROG_CC])dnl
+AC_ARG_VAR([CPP],      [C preprocessor])dnl
+_AC_ARG_VAR_CPPFLAGS()dnl
+# On Suns, sometimes $CPP names a directory.
+if test -n "$CPP" && test -d "$CPP"; then
+  CPP=
+fi
+if test -z "$CPP"; then
+  CPP="$CC -E"
+fi
+AC_SUBST(CPP)dnl
+])# AC_PROG_CPP
+
 dnl This is here so we can set $subdirs directly based on configure fragments.
 AC_CONFIG_SUBDIRS()
 
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