dnl BOOST uses long long, so don't warn about this
CXXFLAGSG="$CXXFLAGSG -Wno-long-long"
+ dnl On some gcc 4.3 snapshots, a 'const' qualifier on a return type triggers a
+ dnl warning. This is unfortunate, since we happen to stumble on this
+ dnl in some of our template trickery with iterator classes. If necessary,
+ dnl do not use the relevant warning flag
+ CXXFLAGS="-Wreturn-type -Werror"
+ AC_MSG_CHECKING(whether qualifiers in return types lead to a warning)
+ AC_TRY_COMPILE(
+ [
+ const double foo() { return 1.; }
+ ],
+ [;],
+ [
+ AC_MSG_RESULT(no)
+ ],
+ [
+ AC_MSG_RESULT(yes)
+ CXXFLAGSG="$CXXFLAGSG -Wno-return-type"
+ ])
+
dnl Set PIC flags. On some systems, -fpic/PIC is implied, so don't set
dnl anything to avoid a warning. on AIX make sure we always pass -lpthread
dnl because this seems to be somehow required to make things work. Likewise
CXXFLAGSG="$CXXFLAGSG -Wno-long-long"
+ CXXFLAGS="-Wreturn-type -Werror"
+ echo "$as_me:$LINENO: checking whether qualifiers in return types lead to a warning" >&5
+echo $ECHO_N "checking whether qualifiers in return types lead to a warning... $ECHO_C" >&6
+ cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h. */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h. */
+
+ const double foo() { return 1.; }
+
+int
+main ()
+{
+;
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+ (eval $ac_compile) 2>conftest.er1
+ ac_status=$?
+ grep -v '^ *+' conftest.er1 >conftest.err
+ rm -f conftest.er1
+ cat conftest.err >&5
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); } &&
+ { ac_try='test -z "$ac_cxx_werror_flag"
+ || test ! -s conftest.err'
+ { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); }; } &&
+ { ac_try='test -s conftest.$ac_objext'
+ { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); }; }; then
+
+ echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+
+else
+ echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+ echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6
+ CXXFLAGSG="$CXXFLAGSG -Wno-return-type"
+
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+
case "$target" in
*aix* )
CXXFLAGSPIC=