[gcc r13-1574] lto-dump: Do not print output file

[gcc r13-1574] lto-dump: Do not print output file

[Martin Liska]

https://gcc.gnu.org/g:95a234f5cbd510e6b8c8e53dd9f1003fddc84c28

commit r13-1574-g95a234f5cbd510e6b8c8e53dd9f1003fddc84c28
Author: Martin Liska <mliska@suse.cz>
Date:   Mon Jul 4 16:32:51 2022 +0200

    lto-dump: Do not print output file
    
    Right now the following is printed:
    
    lto-dump
            .file   "<artificial>"
            .ident  "GCC: (GNU) 13.0.0 20220707 (experimental)"
            .section        .note.GNU-stack,"",@progbits
    
    After the patch we print -help and do not emit any assembly output:
    
    lto-dump
    Usage: lto-dump [OPTION]... SUB_COMMAND [OPTION]...
    
    LTO dump tool command line options.
    
      -list [options]           Dump the symbol list.
        -demangle               Dump the demangled output.
        -defined-only           Dump only the defined symbols.
    ...
    
    gcc/lto/ChangeLog:
    
            * lto-dump.cc (lto_main): Exit in the function
            as we don't want any LTO bytecode processing.
    
    gcc/ChangeLog:
    
            * toplev.cc (init_asm_output): Do not init asm_out_file.

Diff:
---
 gcc/lto/lto-dump.cc | 16 ++++++++++------
 gcc/toplev.cc       |  2 +-
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/gcc/lto/lto-dump.cc b/gcc/lto/lto-dump.cc
index f88486b5143..f3d852df51f 100644
--- a/gcc/lto/lto-dump.cc
+++ b/gcc/lto/lto-dump.cc
@@ -316,7 +316,10 @@ lto_main (void)
 {
   quiet_flag = true;
   if (flag_lto_dump_tool_help)
-    dump_tool_help ();
+    {
+      dump_tool_help ();
+      exit (SUCCESS_EXIT_CODE);
+    }
 
   /* LTO is called as a front end, even though it is not a front end.
      Because it is called as a front end, TV_PHASE_PARSING and
@@ -369,11 +372,12 @@ lto_main (void)
     {
       /* Dump specific gimple body of specified function.  */
       dump_body ();
-      return;
     }
   else if (flag_dump_callgraph)
-    {
-      dump_symtab_graphviz ();
-      return;
-    }
+    dump_symtab_graphviz ();
+  else
+    dump_tool_help ();
+
+  /* Exit right now.  */
+  exit (SUCCESS_EXIT_CODE);
 }
diff --git a/gcc/toplev.cc b/gcc/toplev.cc
index a24ad5db438..61d234a9ef4 100644
--- a/gcc/toplev.cc
+++ b/gcc/toplev.cc
@@ -721,7 +721,7 @@ init_asm_output (const char *name)
 		     "cannot open %qs for writing: %m", asm_file_name);
     }
 
-  if (!flag_syntax_only)
+  if (!flag_syntax_only && !(global_dc->lang_mask & CL_LTODump))
     {
       targetm.asm_out.file_start ();