[SeaBIOS] Build failure with GCC 6 from Debian Sid/unstable

[Paul Menzel]

Dear SeaBIOS folks,


Am Donnerstag, den 20.10.2016, 23:58 +0200 schrieb Paul Menzel:

> just a note, that due to a regression in GCC 6 in Debian Sid/unstable
> [1] the latest master branch [2] does not build.
> 
> ```
> $ make
>   Build Kconfig config file
>   Compile checking out/src/misc.o
>   Compile checking out/src/stacks.o
> src/stacks.c: Assembler messages:
> src/stacks.c:567: Error: found '(', expected: ')'
> src/stacks.c:567: Error: junk `(%ebp))' after expression
> src/stacks.c:568: Warning: indirect call without `*'
> Makefile:133: die Regel für Ziel „out/src/stacks.o“ scheiterte
> make: *** [out/src/stacks.o] Fehler 1
> ```
> 
> It builds fine with gcc-4.9 and gcc-5.
> 
> ```
> $ make CC=gcc-4.9 -j
> $ make CC=gcc-5 -j
> ```
> 
> There is gcc-6 6.2.0-9 out already [3], but it’s not available over the
> mirrors yet.

And unfortunately the build failure still happens with that version.

In the mean time, there is a separate bug report for this issue for
SeaBIOS that it fails to build from source in Debian [4].

I successfully build SeaBIOS with GCC 6-20161020, so it’s a Debian
packaging issue. Probably due to the change below.

>   * Configure with --enable-default-pie and pass -z now when pie is enabled;
>     on amd64 arm64 armel armhf i386 mips mipsel mips64el ppc64el s390x.
>     Closes: #835148 [6].

I added `no-pic` to the COMMON_CFLAGS, and that fixed the build issue
for me. I don’t understand, what that has to do with PIE though.


Thanks,

Paul


> [1] http://metadata.ftp-master.debian.org/changelogs/main/g/gcc-6/gcc-6_6.2.0-7_changelog
> gcc (Debian 6.2.0-7) 6.2.0 20161018
> [2] commit 00b0402 (docs: fix various typos and inconsistency)
> [3] http://metadata.ftp-master.debian.org/changelogs/main/g/gcc-6/gcc-6_6.2.0-9_changelog
[4] https://bugs.debian.org/841546
seabios: FTBFS: src/stacks.c:635: Error: found '(', expected: ')'
[5] ftp://gcc.gnu.org/pub/gcc/snapshots/6-20161020/
[6] https://bugs.debian.org/835148
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