[Bug lto/65559] [5/6 Regression] lto1.exe: internal compiler error: in read_cgraph_and_symbols, at lto/lto.c:2947

["breedlove.matt at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65559

--- Comment #33 from Matt Breedlove <breedlove.matt at gmail dot com> ---
bootstrap-lto fails to build:

`isl_union_map_read_from_str' referenced in section `.text' of
M:\msys64\tmp\cceOtKWH.ltrans0.ltrans.o: defined in discarded section `.text'
of isl_input.o (symbol from plugin)
`isl_union_map_read_from_str' referenced in section `.text' of
M:\msys64\tmp\cceOtKWH.ltrans0.ltrans.o: defined in discarded section `.text'
of isl_input.o (symbol from plugin)
`isl_union_map_copy' referenced in section `.text' of
M:\msys64\tmp\cceOtKWH.ltrans0.ltrans.o: defined in discarded section 
...


Replacing the lto-wrapper with the one from my previous build makes these
errors disappear.  The patch from my previous build was the following:

--- gcc-5.1.0/gcc/lto-wrapper.c.orig    2015-05-01 16:38:03.348243300 -0400
+++ gcc-5.1.0/gcc/lto-wrapper.c 2015-05-02 00:30:58.345729900 -0400
@@ -934,7 +934,7 @@
          filename[p - argv[i]] = '\0';
          file_offset = (off_t) loffset;
        }
-      fd = open (argv[i], O_RDONLY);
+      fd = open (filename, O_RDONLY|O_BINARY);
       if (fd == -1)
        {
          lto_argv[lto_argc++] = argv[i];


Rainer hasn't tested this yet.  I'm going to do a full native bootstrap-lto
with this, however it was working fine on everything else I compiled.  The
issue with the last tested patch was archive files with offsets were getting
discarded from the build since we were back to not using the parsed archive
filename.