patch 8.1.2316: FORTIFY_SOURCE can also be present in CPPFLAGS

Problem:    FORTIFY_SOURCE can also be present in CPPFLAGS.
Solution:   Remove it in configure. (Benedikt Morbach, closes #2786)

Author: brammool

src/auto/configure

@@ -12989,8 +12989,8 @@ if ac_fn_c_try_link "$LINENO"; then :
 $as_echo "yes" >&6; }; $as_echo "#define HAVE_CANBERRA 1" >>confdefs.h
 
 else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }; CFLAGS="$ac_save_CFLAGS"; LIBS="$ac_save_LIBS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no; try installing libcanberra-dev" >&5
+$as_echo "no; try installing libcanberra-dev" >&6; }; CFLAGS="$ac_save_CFLAGS"; LIBS="$ac_save_LIBS"
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
@@ -14807,6 +14807,7 @@ $as_echo "no" >&6; }
 $as_echo_n "checking whether we need -D_FORTIFY_SOURCE=1... " >&6; }
   if test "$gccmajor" -gt "3"; then
     CFLAGS=`echo "$CFLAGS" | sed -e 's/ *-Wp,-D_FORTIFY_SOURCE=.//g' -e 's/ *-D_FORTIFY_SOURCE=.//g' -e 's/ *-U_FORTIFY_SOURCE//g' -e 's/$/ -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1/'`
+    CPPFLAGS=`echo "$CPPFLAGS" | sed -e 's/ *-Wp,-D_FORTIFY_SOURCE=.//g' -e 's/ *-D_FORTIFY_SOURCE=.//g' -e 's/ *-U_FORTIFY_SOURCE//g'`
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
   else

src/configure.ac

@@ -3789,7 +3789,7 @@ if test "$enable_canberra" = "yes"; then
      ca_context *hello;
      ca_context_create(&hello);],
        AC_MSG_RESULT(yes); AC_DEFINE(HAVE_CANBERRA),
-       AC_MSG_RESULT(no); CFLAGS="$ac_save_CFLAGS"; LIBS="$ac_save_LIBS")
+       AC_MSG_RESULT(no; try installing libcanberra-dev); CFLAGS="$ac_save_CFLAGS"; LIBS="$ac_save_LIBS")
 fi
 
 
@@ -4482,6 +4482,7 @@ if test "$GCC" = yes; then
   AC_MSG_CHECKING(whether we need -D_FORTIFY_SOURCE=1)
   if test "$gccmajor" -gt "3"; then
     CFLAGS=`echo "$CFLAGS" | sed -e 's/ *-Wp,-D_FORTIFY_SOURCE=.//g' -e 's/ *-D_FORTIFY_SOURCE=.//g' -e 's/ *-U_FORTIFY_SOURCE//g' -e 's/$/ -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1/'`
+    CPPFLAGS=`echo "$CPPFLAGS" | sed -e 's/ *-Wp,-D_FORTIFY_SOURCE=.//g' -e 's/ *-D_FORTIFY_SOURCE=.//g' -e 's/ *-U_FORTIFY_SOURCE//g'`
     AC_MSG_RESULT(yes)
   else
     AC_MSG_RESULT(no)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2316,
 /**/
     2315,
 /**/