[FFmpeg-devel] [PATCH v2] configure: fix the bigendian test

[David Michael]

On Sat, Nov 14, 2020 at 2:06 PM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> Am Sa., 14. Nov. 2020 um 18:22 Uhr schrieb David Michael <fedora.dm0 at gmail.com>:
> >
> > There are two issues:
> >
> > When build systems enable LTO in CFLAGS, the unused global integer
> > does not make it into the compiled object file.  As a workaround,
> > check if the compiler understands -fno-lto and append it after
> > CFLAGS while building the endianness test.
> >
> > The hexdump output is line-wrapped, so the expected value will not
> > be matched when its four bytes are split across two lines.  Use the
> > POSIX "-A n" option to disable printing input offsets and delete
> > all newline characters to output continuous hex values to grep.
>
> Please explain how we can reproduce the issue (configure line,
> compiler, os).

It's the same command I sent you for the v1 patch.  Just configure it
to cross-compile to a big-endian target with CFLAGS=-flto in the
environment:

CFLAGS=-flto ./configure --enable-cross-compile --host-cc=gcc
--arch=powerpc --target-os=linux
--cross-prefix=powerpc-unknown-linux-gnu-

Thanks.

David