[binutils-gdb] [gdb/symtab] Support DW_AT_main_subprogram with -readnow.

[Tom de Vries <vries@sourceware.org>]

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=81873cc81effbd657efe5f525d369e430ce77d7a

commit 81873cc81effbd657efe5f525d369e430ce77d7a
Author: Tom de Vries <tdevries@suse.de>
Date:   Mon Jun 10 09:28:30 2019 +0200

    [gdb/symtab] Support DW_AT_main_subprogram with -readnow.
    
    DW_AT_main_subprogram is supported in normal mode in read_partial_die, but not
    in -readnow mode.
    
    Fix this by adding support for DW_AT_main_subprogram in read_func_scope.
    
    Tested on x86_64-linux with native and RFC target board readnow (
    https://sourceware.org/ml/gdb-patches/2019-05/msg00073.html ).
    
    gdb/ChangeLog:
    
    2019-06-10  Tom de Vries  <tdevries@suse.de>
    
    	PR symtab/16264
    	PR symtab/24517
    	* dwarf2read.c (read_func_scope): Handle DW_AT_main_subprogram.

Diff:
---
 gdb/ChangeLog    | 6 ++++++
 gdb/dwarf2read.c | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index efe4618..3a40ecc 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2019-06-10  Tom de Vries  <tdevries@suse.de>
+
+	PR symtab/16264
+	PR symtab/24517
+	* dwarf2read.c (read_func_scope): Handle DW_AT_main_subprogram.
+
 2019-06-06  Руслан Ижбулатов <lrn1986@gmail.com>
 
 	* source.c (find_and_open_source): Also rewrite relative file
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index e1d6bb2..9d9bc99 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -13746,6 +13746,10 @@ read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
   newobj->name = new_symbol (die, read_type_die (die, cu), cu,
 			     (struct symbol *) templ_func);
 
+  if (dwarf2_flag_true_p (die, DW_AT_main_subprogram, cu))
+    set_objfile_main_name (objfile, SYMBOL_LINKAGE_NAME (newobj->name),
+			   cu->language);
+
   /* If there is a location expression for DW_AT_frame_base, record
      it.  */
   attr = dwarf2_attr (die, DW_AT_frame_base, cu);