Next to setting explicit CFLAGS also set CXXFLAGS.

As we compile everything using CXXFLAGS when its C++ we should also set
the specific CFLAGS in CXXFLAGS on some platforms.

autoconf/configure.in

@@ -3482,6 +3482,7 @@ bsdi)
    TAPEDRIVE="/dev/nrmt0"
    PTHREAD_LIB="-pthread"
    CFLAGS="${CFLAGS} -pthread"
+   CXXFLAGS="${CXXFLAGS} -pthread"
    PSCMD="ps -ax -o pid,command"
    lld="qd"
    llu="qu"
@@ -3520,6 +3521,7 @@ freebsd)
    if test x$VER = x4 ; then
       PTHREAD_LIB="${PTHREAD_LIBS:--pthread}"
       CFLAGS="${CFLAGS} ${PTHREAD_CFLAGS:--pthread}"
+      CXXFLAGS="${CXXFLAGS} ${PTHREAD_CFLAGS:--pthread}"
    fi
    lld="qd"
    llu="qu"
@@ -3544,6 +3546,7 @@ hurd)
 hpux)
    PSCMD="UNIX95=1; ps -e -o pid,comm"
    CFLAGS="${CFLAGS} -D_XOPEN_SOURCE_EXTENDED=1"
+   CXXFLAGS="${CXXFLAGS} -D_XOPEN_SOURCE_EXTENDED=1"
    TAPEDRIVE="/dev/rmt/0hnb"
    PTHREAD_LIB="-lpthread"
    AC_DEFINE(_INCLUDE_LONGLONG, 1, [Needed on HP-UX/g++ systems to support long long ints (int64)])
@@ -3564,6 +3567,7 @@ netbsd)
    PSCMD="ps -ax -o pid,command"
    PTHREAD_LIB="-pthread"
    CFLAGS="${CFLAGS} -pthread"
+   CXXFLAGS="${CXXFLAGS} -pthread"
   ;;
 openbsd)
    lld="qd"
@@ -3572,6 +3576,7 @@ openbsd)
    PSCMD="ps -ax -o pid,command"
    PTHREAD_LIB="-pthread"
    CFLAGS="${CFLAGS} -pthread"
+   CXXFLAGS="${CXXFLAGS} -pthread"
    PFILES="${PFILES} \
        platforms/openbsd/Makefile \
        platforms/openbsd/bareos-fd \
@@ -3603,7 +3608,7 @@ gentoo)
    PSCMD="ps -e -o pid,command"
    PFILES="${PFILES} \
        platforms/gentoo/Makefile \
-    platforms/gentoo/bareos-init \
+       platforms/gentoo/bareos-init \
        platforms/gentoo/bareos-fd \
        platforms/gentoo/bareos-sd \
        platforms/gentoo/bareos-dir"