[PATCH] Do not inline variadic thunks (PR ipa/83549).

[Martin Liška]

Hi.

As mentioned in the PR, we should bail out inlining of thunks with variadic
arguments. It's problematic for cgraph_node::expand_thunk function that
does not support variadic functions.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.

Ready to be installed?
Martin

gcc/ChangeLog:

2018-01-03  Martin Liska  <mli...@suse.cz>

        PR ipa/83549
        * ipa-fnsummary.c (compute_fn_summary): Do not inline variadic
        thunks.

gcc/testsuite/ChangeLog:

2018-01-03  Martin Liska  <mli...@suse.cz>

        PR ipa/83549
        * g++.dg/ipa/pr83549.C: New test.
---
 gcc/ipa-fnsummary.c                | 5 +++++
 gcc/testsuite/g++.dg/ipa/pr83549.C | 8 ++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/ipa/pr83549.C



diff --git a/gcc/ipa-fnsummary.c b/gcc/ipa-fnsummary.c
index 94150312105..274bd8c6758 100644
--- a/gcc/ipa-fnsummary.c
+++ b/gcc/ipa-fnsummary.c
@@ -2422,6 +2422,11 @@ compute_fn_summary (struct cgraph_node *node, bool early)
           info->inlinable = false;
           node->callees->inline_failed = CIF_CHKP;
 	}
+      else if (stdarg_p (TREE_TYPE (node->decl)))
+	{
+	  info->inlinable = false;
+	  node->callees->inline_failed = CIF_MISMATCHED_ARGUMENTS;
+	}
       else
         info->inlinable = true;
     }
diff --git a/gcc/testsuite/g++.dg/ipa/pr83549.C b/gcc/testsuite/g++.dg/ipa/pr83549.C
new file mode 100644
index 00000000000..90cf8fe7e0d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/pr83549.C
@@ -0,0 +1,8 @@
+// PR ipa/83549
+// { dg-do compile }
+// { dg-options "-O2" }
+
+struct A { virtual ~A (); };
+struct B { virtual void foo (...); };
+struct C : A, B { void foo (...) {} };
+C c;