Hi This patch is an attempt to fix https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67280. I have written up an analysis of the bug there.
When cgraph_node::create_wrapper() updates the callgraph for the new
function, it sets the can_throw_external flag to false, even when
wrapping a function which can throw. This causes the ipa-pure-const
phase to mark the wrapper function as nothrow which results in
incorrect unwinding tables. (more details on bugzilla)
The attached patch addresses the problem in
cgraph_node::create_wrapper(). A slightly more general approach would
be to change symbol_table::create_edge() so that it checks
TREE_NOTHROW(callee->decl) when call_stmt is NULL.
This patch passed make check with no new regressions on gcc-5-branch
on arm-linux-gnueabihf using qemu.
I will do a bootstrap on ARM hardware over the weekend. Do I also need
to test x86_64?
I plan to add a test case, but it seems it's worth getting review for
the approach in the mean time.
Thanks,
Charles
gcc/ChangeLog:
2015-08-28 Charles Baylis <charles.bay...@linaro.org>
* cgraphunit.c (cgraph_node::create_wrapper): Set can_throw_external
in new callgraph edge.
0001-fix-up-can_throw_external-in-cgraph_node-create_wrap.patch
Description: application/download
