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List:       binutils-bugs
Subject:    [Bug binutils/23348] New: binutils strip corrupts binaries produced by clang+lld+mingw-w64 toolchain
From:       "jacek at codeweavers dot com" <sourceware-bugzilla () sourceware ! org>
Date:       2018-06-27 19:19:18
Message-ID: bug-23348-70 () http ! sourceware ! org/bugzilla/
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https://sourceware.org/bugzilla/show_bug.cgi?id=23348

            Bug ID: 23348
           Summary: binutils strip corrupts binaries produced by
                    clang+lld+mingw-w64 toolchain
           Product: binutils
           Version: 2.32 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: jacek at codeweavers dot com
  Target Milestone: ---

Created attachment 11103
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11103&action=edit
test.exe

The problem can be reproduced by toolchains using mingw-w64 with clang and lld
such as:
https://github.com/mstorsjo/llvm-mingw
or attempts to build Mozilla with similar config:
https://bugzilla.mozilla.org/show_bug.cgi?id=1465798

Stripped binaries can't be ran on Windows and instead I get "is not a valid
win32 application" error. Experimenting a bit, I found if we use -Wl,-s to let
linker strip the binaries and then strip again with binutils, the resulting
file is fine.

To reproduce:

$ cat test.c
#include <stdio.h>

int main() {
    printf("hello world\n");
    return 0;
}
$ x86_64-w64-mingw32-clang test.c -o test.exe
# test.exe works fine
$ x86_64-w64-mingw32-strip test.exe  -o test-stripped-by-binutils.exe
# test-stripped-by-binutils.exe is corrupted

I will attach test.exe and test-stripped-by-binutils.exe.

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