From 1cb262099e1d777a0413517633ba9de85d647635 Mon Sep 17 00:00:00 2001
From: Ian Lynagh <igloo@earth.li>
Date: Sat, 5 Jul 2008 16:31:13 +0000
Subject: [PATCH] On cygwin, convert happy's path to a native path

---
 aclocal.m4 |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/aclocal.m4 b/aclocal.m4
index df7db2c..8593b89 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -268,6 +268,16 @@ dnl for a happy source tree and point the build system at that instead.
 dnl
 AC_DEFUN([FPTOOLS_HAPPY],
 [AC_PATH_PROG(HappyCmd,happy,)
+# Happy is passed to Cabal, so we need a native path
+if test "x$HostPlatform"  = "xi386-unknown-mingw32" && \
+   test "${OSTYPE}"      != "msys"                  && \
+   test "${HappyCmd}"    != ""
+then
+    # Canonicalise to <drive>:/path/to/gcc
+    HappyCmd=`cygpath -m ${HappyCmd}`
+    AC_MSG_NOTICE([normalized happy command to $HappyCmd])
+fi
+
 AC_CACHE_CHECK([for version of happy], fptools_cv_happy_version,
 changequote(, )dnl
 [if test x"$HappyCmd" != x; then
-- 
1.7.10.4