[PATCH] Fix segfault in inliner with attribute flatten

[Andi Kleen]

From: Andi Kleen <a...@linux.intel.com>

This fixes a segfault in gcc 7/8 when building turicreate.

For some reason the node has no decl here, and there is a
crash when checking for attribute flatten.

gcc/:

2017-12-10  Andi Kleen  <a...@linux.intel.com>

        PR ipa/83346
        * ipa-inline.c (ipa_inline): Check for NULL pointer.

gcc/testsuite:

2017-12-10  Andi Kleen  <a...@linux.intel.com>

        * g++.dg/pr83346.C: Add.
---
 gcc/ipa-inline.c               |  3 ++-
 gcc/testsuite/g++.dg/pr83346.C | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/pr83346.C

diff --git a/gcc/ipa-inline.c b/gcc/ipa-inline.c
index 7846e93d119..dcd8a3de1ac 100644
--- a/gcc/ipa-inline.c
+++ b/gcc/ipa-inline.c
@@ -2391,7 +2391,8 @@ ipa_inline (void)
         entry of cycles, possibly cloning that entry point and
         try to flatten itself turning it into a self-recursive
         function.  */
-      if (lookup_attribute ("flatten",
+      if (node->decl
+        && lookup_attribute ("flatten",
                            DECL_ATTRIBUTES (node->decl)) != NULL)
        {
          if (dump_file)
diff --git a/gcc/testsuite/g++.dg/pr83346.C b/gcc/testsuite/g++.dg/pr83346.C
new file mode 100644
index 00000000000..2a916223dc9
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pr83346.C
@@ -0,0 +1,32 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" }  */
+namespace {
+template <typename, typename a> struct b { a c; };
+}
+typedef int d;
+namespace {
+namespace {
+template <typename e, typename = e, typename = e> class ac;
+typedef ac<char> ad;
+template <typename, typename, typename> class ac {
+public:
+  ~ac();
+};
+}
+typedef ad f;
+struct g {};
+enum ag {};
+class ae {
+public:
+  ~ae();
+  template <typename h> ae(h);
+  union aj {
+    b<d, f> *ak;
+    struct {
+      ag al;
+    };
+  } am;
+  __attribute__((always_inline)) void an(aj i, ag) { delete i.ak; }
+} ao = g();
+__attribute__((always_inline, flatten)) ae::~ae() { an(am, am.al); }
+}
-- 
2.15.1