Re: [PATCH, GCC/LTO] Fix PR69866: LTO with def for weak alias in regular object file

[Thomas Preudhomme <thomas dot preudhomme at foss dot arm dot com>]

Ping?

Best regards,

Thomas

On 02/03/17 14:51, Thomas Preudhomme wrote:
> Hi,
>
> This patch fixes an assert failure when linking one LTOed object file
> having a weak alias with a regular object file containing a strong
> definition for that same symbol. The patch is twofold:
>
> + do not add an alias to a partition if it is external
> + do not declare (.globl) an alias if it is external
>
> ChangeLog entries are as follow:
>
> *** gcc/lto/ChangeLog ***
>
> 2017-03-01  Thomas Preud'homme  <thomas.preudhomme@arm.com>
>
>     PR lto/69866
>     * lto/lto-partition.c (add_symbol_to_partition_1): Do not add external
>     aliases to partition.
>
> *** gcc/ChangeLog ***
>
> 2017-03-01  Thomas Preud'homme  <thomas.preudhomme@arm.com>
>
>     PR lto/69866
>     * cgraphunit.c (cgraph_node::assemble_thunks_and_aliases): Do not
>     declare external aliases.
>
> *** gcc/testsuite/ChangeLog ***
>
> 2017-02-28  Thomas Preud'homme  <thomas.preudhomme@arm.com>
>
>     PR lto/69866
>     * gcc.dg/lto/pr69866_0.c: New test.
>     * gcc.dg/lto/pr69866_1.c: Likewise.
>
>
> Testing: Testsuite shows no regression when targeting Cortex-M3 with an
> arm-none-eabi GCC cross-compiler, neither does it show any regression with
> native LTO-bootstrapped x86-64_linux-gnu and aarch64-linux-gnu compilers.
>
> Is this ok for stage4?
>
> Best regards,
>
> Thomas
diff --git a/gcc/cgraphunit.c b/gcc/cgraphunit.c
index c82a88a599ca61b068dd9783d2a6158163809b37..580500ff922b8546d33119261a2455235edbf16d 100644
--- a/gcc/cgraphunit.c
+++ b/gcc/cgraphunit.c
@@ -1972,7 +1972,7 @@ cgraph_node::assemble_thunks_and_aliases (void)
   FOR_EACH_ALIAS (this, ref)
     {
       cgraph_node *alias = dyn_cast <cgraph_node *> (ref->referring);
-      if (!alias->transparent_alias)
+      if (!alias->transparent_alias && !DECL_EXTERNAL (alias->decl))
 	{
 	  bool saved_written = TREE_ASM_WRITTEN (decl);
 
diff --git a/gcc/lto/lto-partition.c b/gcc/lto/lto-partition.c
index e27d0d1690c1fcfb39e2fac03ce0f4154031fc7c..f44fd435ed075a27e373bdfdf0464eb06e1731ef 100644
--- a/gcc/lto/lto-partition.c
+++ b/gcc/lto/lto-partition.c
@@ -178,7 +178,8 @@ add_symbol_to_partition_1 (ltrans_partition part, symtab_node *node)
   /* Add all aliases associated with the symbol.  */
 
   FOR_EACH_ALIAS (node, ref)
-    if (!ref->referring->transparent_alias)
+    if (!ref->referring->transparent_alias
+	&& ref->referring->get_partitioning_class () != SYMBOL_EXTERNAL)
       add_symbol_to_partition_1 (part, ref->referring);
     else
       {
@@ -189,7 +190,8 @@ add_symbol_to_partition_1 (ltrans_partition part, symtab_node *node)
 	  {
 	    /* Nested transparent aliases are not permitted.  */
 	    gcc_checking_assert (!ref2->referring->transparent_alias);
-	    add_symbol_to_partition_1 (part, ref2->referring);
+	    if (ref2->referring->get_partitioning_class () != SYMBOL_EXTERNAL)
+	      add_symbol_to_partition_1 (part, ref2->referring);
 	  }
       }
 
diff --git a/gcc/testsuite/gcc.dg/lto/pr69866_0.c b/gcc/testsuite/gcc.dg/lto/pr69866_0.c
new file mode 100644
index 0000000000000000000000000000000000000000..f49ef8d4c1da7a21d1bfb5409d647bd18141595b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/lto/pr69866_0.c
@@ -0,0 +1,13 @@
+/* { dg-lto-do link } */
+
+int _umh(int i)
+{
+  return i+1;
+}
+
+int weaks(int i) __attribute__((weak, alias("_umh")));
+
+int main()
+{
+  return weaks(10);
+}
diff --git a/gcc/testsuite/gcc.dg/lto/pr69866_1.c b/gcc/testsuite/gcc.dg/lto/pr69866_1.c
new file mode 100644
index 0000000000000000000000000000000000000000..3a14f850eefaffbf659ce4642adef7900330f4ed
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/lto/pr69866_1.c
@@ -0,0 +1,6 @@
+/* { dg-options { -fno-lto } } */
+
+int weaks(int i)
+{
+  return i+1;
+}