From 05fbcb47684eaffc23f5fc3dda52690baf629aaa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lubo=C5=A1=20Lu=C5=88=C3=A1k?= <l.lunak@collabora.com>
Date: Sat, 9 Mar 2019 11:32:07 +0100
Subject: [PATCH] AC_CHECK_HEADER uses both CXX and CXXCPP
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Because it does both a compile and a preprocessor check.

Change-Id: I2f144ea63ae1481822bb239127f0f5a934e22e73
Reviewed-on: https://gerrit.libreoffice.org/68971
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 7f63ecd0f7db..40dac2f7fa0f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6887,9 +6887,11 @@ if test "$COM_IS_CLANG" = "TRUE"; then
         AC_LANG_PUSH([C++])
         save_CPPFLAGS=$CPPFLAGS
         save_CXX=$CXX
+        save_CXXCPP=$CXXCPP
         # compiler plugins must be built with "native" compiler that was used to build Clang itself:
         : "${COMPILER_PLUGINS_CXX=g++ -std=c++11}"
         CXX=$COMPILER_PLUGINS_CXX
+        CXXCPP="$COMPILER_PLUGINS_CXX -E"
         CPPFLAGS="$CPPFLAGS -I$CLANGDIR/include -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS"
         AC_CHECK_HEADER(clang/AST/RecursiveASTVisitor.h,
             [COMPILER_PLUGINS=TRUE],
@@ -6902,6 +6904,7 @@ if test "$COM_IS_CLANG" = "TRUE"; then
             fi
             ])
         CXX=$save_CXX
+        CXXCPP=$save_CXXCPP
         CPPFLAGS=$save_CPPFLAGS
         AC_LANG_POP([C++])
     fi