+ac_link="$ac_link $ld_switch_system"
+
+
+C_SWITCH_MACHINE=
+if test "$machine" = "alpha"; then
+ { $as_echo "$as_me:$LINENO: checking whether __ELF__ is declared" >&5
+$as_echo_n "checking whether __ELF__ is declared... " >&6; }
+if test "${ac_cv_have_decl___ELF__+set}" = set; then
+ $as_echo_n "(cached) " >&6
+else
+ cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h. */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h. */
+$ac_includes_default
+int
+main ()
+{
+#ifndef __ELF__
+ (void) __ELF__;
+#endif
+
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+ *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+ *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+ (eval "$ac_compile") 2>conftest.er1
+ ac_status=$?
+ grep -v '^ *+' conftest.er1 >conftest.err
+ rm -f conftest.er1
+ cat conftest.err >&5
+ $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); } && {
+ test -z "$ac_c_werror_flag" ||
+ test ! -s conftest.err
+ } && test -s conftest.$ac_objext; then
+ ac_cv_have_decl___ELF__=yes
+else
+ $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ ac_cv_have_decl___ELF__=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_have_decl___ELF__" >&5
+$as_echo "$ac_cv_have_decl___ELF__" >&6; }
+
+ if test "$ac_cv_have_decl___ELF__" = "yes"; then
+ ## With ELF, make sure that all common symbols get allocated to in the
+ ## data section. Otherwise, the dump of temacs may miss variables in
+ ## the shared library that have been initialized. For example, with
+ ## GNU libc, __malloc_initialized would normally be resolved to the
+ ## shared library's .bss section, which is fatal.
+ if test "x$GCC" = "xyes"; then
+ C_SWITCH_MACHINE="-fno-common"
+ else
+ { { $as_echo "$as_me:$LINENO: error: What gives? Fix me if DEC Unix supports ELF now." >&5
+$as_echo "$as_me: error: What gives? Fix me if DEC Unix supports ELF now." >&2;}
+ { (exit 1); exit 1; }; }
+ fi
+ fi
+fi
+
+
+
+C_SWITCH_SYSTEM=
+## Some programs in src produce warnings saying certain subprograms
+## are too complex and need a MAXMEM value greater than 2000 for
+## additional optimization. --nils@exp-math.uni-essen.de
+test "$opsys" = "aix4.2" && test "x$GCC" = "xyes" && \
+ C_SWITCH_SYSTEM="-ma -qmaxmem=4000"
+## gnu-linux might need -D_BSD_SOURCE on old libc5 systems.
+## It is redundant in glibc2, since we define _GNU_SOURCE.
+
+