[Octave-bug-tracker] [bug #52708] Failure on build-flex on Ubuntu 17.10 VM for flex 2.6.4

[Marshall]

URL:
  <http://savannah.gnu.org/bugs/?52708>

                 Summary: Failure on build-flex on Ubuntu 17.10 VM for flex
2.6.4
                 Project: GNU Octave
            Submitted by: marsian
            Submitted on: Wed 20 Dec 2017 08:45:39 PM UTC
                Category: Configuration and Build System
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: None
             Assigned to: None
         Originator Name: Marsian
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

When flex is set to use version 2.6.4 in mxe-octave/src/build-flex.mk, then I
get a build failure. I'm running Ubuntu 17.10 on virtual box, to compile a
windows installer. If I change the version to 2.6.3 (and checksum to
5ca32baa607ed32aa069e18d6d60b9761e1e6538), then It will compile.

I am using the following configure options:
./configure --enable-devel-tools --enable-octave=default --enable-qt5
--enable-64 --enable-windows-64
>From a working build changing back to the original build-flex with version
2.6.4, and running the following, it fails again:


touch src/build-flex.mk
make nsis-installer JOBS=4


I geet the following error:

[download] build-flex
[build]    build-flex

Failed to build package build-flex!
------------------------------------------------------------
Makefile:533: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory
'/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4.build'
/home/marshall/mxe-octave/Makefile:852: recipe for target
'build-only-build-flex' failed
make[1]: *** [build-only-build-flex] Error 2
make[1]: Leaving directory '/home/marshall/mxe-octave'
real    0m8.342s
user    0m11.603s
sys     0m1.584s
------------------------------------------------------------
[log]      /home/marshall/mxe-octave/log/build-flex


from  /home/marshall/mxe-octave/log/build-flex, I get the following details:

/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/misc.c:147:8: warning:
implicit declaration of function ‘reallocarray’; did you mean
‘reallocate_array’? [-Wimplicit-function-declaration]
  mem = reallocarray(NULL, (size_t) size, element_size);
        ^~~~~~~~~~~~
        reallocate_array
/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/misc.c:147:6: warning:
assignment makes pointer from integer without a cast [-Wint-conversion]
  mem = reallocarray(NULL, (size_t) size, element_size);
      ^
/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/misc.c: In function
‘reallocate_array’:
/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/misc.c:664:12:
warning: assignment makes pointer from integer without a cast
[-Wint-conversion]
  new_array = reallocarray(array, (size_t) size, element_size);
            ^
...
/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/misc.c:147:8: warning:
implicit declaration of function ‘reallocarray’; did you mean
‘reallocate_array’? [-Wimplicit-function-declaration]
  mem = reallocarray(NULL, (size_t) size, element_size);
        ^~~~~~~~~~~~
        reallocate_array
/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/misc.c:147:6: warning:
assignment makes pointer from integer without a cast [-Wint-conversion]
  mem = reallocarray(NULL, (size_t) size, element_size);
      ^
/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/misc.c: In function
‘reallocate_array’:
/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/misc.c:664:12:
warning: assignment makes pointer from integer without a cast
[-Wint-conversion]
  new_array = reallocarray(array, (size_t) size, element_size);
            ^
...
./stage1flex   -o stage1scan.c
/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4/src/scan.l
Makefile:1696: recipe for target 'stage1scan.c' failed
make[4]: *** [stage1scan.c] Segmentation fault (core dumped)
make[4]: Leaving directory
'/home/marshall/mxe-octave/tmp-build-flex/flex-2.6.4.build/src'
...

There seems to be several possibly related bugs reported to flex, 
https://github.com/westes/flex/issues/219
https://github.com/westes/flex/issues/265
I'm not sure if any of those fixes apply, but in any case, building flex fails
when run from a clean repo/build of mxe-octave.





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