[RFA] Fix PR 16201: internal error on a cygwin program linked against a DLL with no .data section

["Pierre Muller" <pierre.muller@ics-cnrs.unistra.fr>]

  See discussion in 
https://sourceware.org/bugzilla/show_bug.cgi?id=16201

  The patch below seems to fix the issues as it avoids calling
prim_record_minimal_symbol
with ms_type argument being equal to mst_XXX (where XXX can be text, data or
bss)
without having set sect_index_XXX field of the corresponding objfile.

  Is this OK?

Pierre Muller


2013-11-27  Pierre Muller  <muller@sourceware.org>

        PR 16201
        coff-pe-read.c (read_pe_exported_syms): Set sect_index_text,
        sect_index_data and sect_index_bss of objfile struct, even if
        there is no canonical '.text', '.data' or '.bss' named section.

diff --git a/gdb/coff-pe-read.c b/gdb/coff-pe-read.c
index 91ee3f6..954c457 100644
--- a/gdb/coff-pe-read.c
+++ b/gdb/coff-pe-read.c
@@ -466,6 +466,13 @@ read_pe_exported_syms (struct objfile *objfile)
        {
          section_data[sectix].rva_start = vaddr;
          section_data[sectix].rva_end = vaddr + vsize;
+         /* Force sect_index, even if it was already set before.  */
+         if (sectix == PE_SECTION_INDEX_TEXT)
+           objfile->sect_index_text = sectix;
+         if (sectix == PE_SECTION_INDEX_DATA)
+           objfile->sect_index_data = sectix;
+         if (sectix == PE_SECTION_INDEX_BSS)
+           objfile->sect_index_bss = sectix;
        }
       else
        {
@@ -480,11 +487,23 @@ read_pe_exported_syms (struct objfile *objfile)
          section_data[otherix].rva_end = vaddr + vsize;
          section_data[otherix].vma_offset = 0;
          if (characteristics & IMAGE_SCN_CNT_CODE)
-           section_data[otherix].ms_type = mst_text;
+           {
+             section_data[otherix].ms_type = mst_text;
+             if (objfile->sect_index_text == -1)
+               objfile->sect_index_text = otherix;
+           }
          else if (characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
-           section_data[otherix].ms_type = mst_data;
+           {
+             section_data[otherix].ms_type = mst_data;
+             if (objfile->sect_index_data == -1)
+             objfile->sect_index_data = otherix;
+           }
          else if (characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
-           section_data[otherix].ms_type = mst_bss;
+           {
+             section_data[otherix].ms_type = mst_bss;
+             if (objfile->sect_index_bss == -1)
+               objfile->sect_index_bss = otherix;
+           }
          else
            section_data[otherix].ms_type = mst_unknown;
          otherix++;