configure.ac: Always check for C++ compiler

Even though libinput uses no C++, it should be supported to include
libinput.h from C++. Therefore a build test ensuring this possibility
exist. However, since we can not conditionally invoke AC_PROG_CXX
in configure.ac just do it always.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>

diff --git a/configure.ac b/configure.ac
index e44adcb..faae148 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,7 @@ AM_SILENT_RULES([yes])
 
 # Check for programs
 AC_PROG_CC_C99
+AC_PROG_CXX # Only used by build C++ test
 
 # Initialize libtool
 LT_PREREQ([2.2])
@@ -75,9 +76,6 @@ fi
 if test "x$build_tests" = "xyes" -a "x$HAVE_CHECK" = "xno"; then
        AC_MSG_ERROR([Cannot build tests, check is missing])
 fi
-if test "x$build_tests" = "xyes"; then
-       AC_PROG_CXX
-fi
 
 AM_CONDITIONAL(BUILD_TESTS, [test "x$build_tests" = "xyes"])