From d29a5b367c20c979ec9349dda85a4b947742cb2a Mon Sep 17 00:00:00 2001
From: Luboš Luňák <l.lunak@suse.cz>
Date: Fri, 22 Jun 2012 19:12:04 +0200
Subject: bring back precompiled headers support

This is mostly a revert of 992757cc5ebfb1df42636b8d3269cdbc10fc4148
and bc78ac68c2492e63a680f68b524c4a51179ea83e, with tweaks to apply.
Also only MSVC support for now.

Change-Id: Ia926b3c28125b52012156ccfd47932837b09d20a
---
 configure.ac | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 648da1a55cac..96f517e9c48c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -677,6 +677,11 @@ AC_ARG_ENABLE(vba,
         [Disables the vba compatibility feature.])
 )
 
+AC_ARG_ENABLE(pch,
+    AS_HELP_STRING([--enable-pch],
+        [Enables precompiled header support for C++.])
+)
+
 AC_ARG_ENABLE(win-mozab-driver,
     AS_HELP_STRING([--enable-win-mozab-driver],
         [LibreOffice includes a driver to connect to Mozilla 
@@ -4474,7 +4479,23 @@ dnl ===================================================================
 dnl ENABLE_PCH i now a no-op
 dnl ===================================================================
 AC_MSG_CHECKING([whether to enable pch feature])
-AC_MSG_RESULT([no, obsolete])
+if test -n "$enable_pch" && test "$enable_pch" != "no"; then
+    if test "$_os" = "WINNT" -a "$WITH_MINGW" != "yes"; then
+        ENABLE_PCH="TRUE"
+        AC_MSG_RESULT([yes])
+dnl There is no PCH support in GCC versions prior to this
+    elif test "$GCC" = "yes"; then
+        ENABLE_PCH="TRUE"
+        AC_MSG_RESULT([yes])
+    else
+        ENABLE_PCH=""
+        AC_MSG_WARN([Precompiled header not yet supported for your platform/compiler])
+    fi
+else
+    ENABLE_PCH=""
+    AC_MSG_RESULT([no])
+fi
+AC_SUBST(ENABLE_PCH)
 
 dnl ===================================================================
 dnl Search all the common names for GNU make
-- 
cgit