[bug #50790] Some kind of memory corruption in error messages with gcc-6.3.0 -flto=4

[Jan Ziak]

URL:
  <http://savannah.gnu.org/bugs/?50790>

                 Summary: Some kind of memory corruption in error messages
with gcc-6.3.0 -flto=4
                 Project: make
            Submitted by: atomsymbol
            Submitted on: Wed 12 Apr 2017 06:07:20 PM UTC
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.2.1
        Operating System: POSIX-Based
           Fixed Release: None
           Triage Status: None

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Details:

Hello.

The following is the output of a Makefile-based project which uses GCC 6.3.0
to compile C/C++ files. make is invoked with -j4 on the command line. The
command-line option -flto=4 is being passed to the GCC compiler. The bug goes
away if -flto=1 or -flto is used instead of -flto=4.

Is this a make-4.2.1 bug, or a gcc-6.3.0 bug? The line numbers in the garbled
error messages, in this case 79 and 84, are correct.

$ make -j4
...
collect2: error: ld returned 1 exit status
make: *** [Makefile:84: target1] Error 1
make: *** Waiting for unfinished jobs....
...
make: *** [Makefile:79: target2] Error 1
...
collect2: error: ld returned 1 exit status
make[1]: *** [4
               �
:79: target2] Error 1
make[1]: *** Waiting for unfinished jobs....
...
collect2: error: ld returned 1 exit status
make[1]: *** [4
               �
:84: target1] Error 1
lto-wrapper: fatal error: make returned 2 exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make: *** [Makefile:71: tul] Error 1

A line obtained by running /usr/bin/make under /usr/bin/strace is:

execve("/usr/bin/make", ["/usr/bin/make", "-f", "/tmp/ccZfEp7k.mk", "-j4"],
[/* 101 vars */] <unfinished ...>




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