While I'd still like to detect the obvious wrong cases like outlined
in comment #27 of the PR the following makes the seemingly obvious
workarounds work (use -fno-builtin, -ffreestanding or -fno-hosted).
Ok for trunk and branches?
Thanks,
Richard.
2014-05-06 Richard Biener <rguent...@suse.de>
c-family/
* c-opts.c (c_common_post_options): For -freestanding,
-fno-hosted and -fno-builtin disable pattern recognition
if not enabled explicitely.
Index: gcc/c-family/c-opts.c
===================================================================
*** gcc/c-family/c-opts.c (revision 210097)
--- gcc/c-family/c-opts.c (working copy)
*************** c_common_post_options (const char **pfil
*** 851,856 ****
--- 851,862 ----
if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
flag_exceptions = 1;
+ /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
+ pattern recognition. */
+ if (!global_options_set.x_flag_tree_loop_distribute_patterns
+ && flag_no_builtin)
+ flag_tree_loop_distribute_patterns = 0;
+
/* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
It is never enabled in C++, as the minimum limit is not normative
in that standard. */
