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

--- Comment #20 from Rainer Emrich <rai...@emrich-ebersheim.de> ---
Kai,

(In reply to Kai Tietz from comment #18)
> Does the following patch fixes your problem?
> 
> Index: lto-wrapper.c
> ===================================================================
> --- lto-wrapper.c       (Revision 222269)
> +++ lto-wrapper.c       (Arbeitskopie)
> @@ -934,7 +934,7 @@ run_gcc (unsigned argc, char *argv[])
>           filename[p - argv[i]] = '\0';
>           file_offset = (off_t) loffset;
>         }
> -      fd = open (argv[i], O_RDONLY);
> +      fd = open (argv[i], O_RDONLY|O_BINARY);
>        if (fd == -1)
>         {
>           lto_argv[lto_argc++] = argv[i];

the following as Matt suggested

Index: lto-wrapper.c
===================================================================
--- lto-wrapper.c       (Revision 222611)
+++ lto-wrapper.c       (Arbeitskopie)
@@ -934,7 +934,7 @@ run_gcc (unsigned argc, char *argv[])
          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];


fixes the issue and not only this.

I did a full native x86_64-w64-mingw32 bootstrap for c,c++ and ran the
testsuite. A quick inspection shows that most lto failures are gone.

gcc-5.1.0
                === gcc Summary ===

# of expected passes            106113
# of unexpected failures        1809
# of unexpected successes       20
# of expected failures          282
# of unresolved testcases       1242
# of unsupported tests          1940 

gcc-5.1.1 revision 222611 patch applied
                === gcc Summary ===

# of expected passes            108435
# of unexpected failures        839
# of unexpected successes       21
# of expected failures          283
# of unresolved testcases       21
# of unsupported tests          1907 

I have to look at the related PRs still.

I can't test on Linux at the moment. Has somebody the time to do a regression
test for the patch on Linux? Kai?

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