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Building Emacs-trunk with gcc >= 4.5.1 and libelf installed
From: |
Angelo Graziosi |
Subject: |
Building Emacs-trunk with gcc >= 4.5.1 and libelf installed |
Date: |
Tue, 24 Aug 2010 01:31:23 +0200 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.9.2.8) Gecko/20100802 Thunderbird/3.1.2 |
Trying to build Emacs-trunk on Cygwin with GCC >= 4.5.1, I have found a
problem if also the package 'libelf0' is installed.
The build fails in this way:
=====================================
./configure
[...]
checking for elf_begin in -lelf... yes
[...]
make
[...]
gcc-4.6...
In file included from /usr/include/X11/Xos.h:146:0,
from /tmp/emacs/src/xfaces.c:277:
/usr/include/X11/Xarch.h:43:30: fatal error: sys/byteorder.h: No such
file or directory
compilation terminated.
make[2]: *** [xfaces.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/tmp/emacs/Work/src'
make[1]: *** [src] Error 2
make[1]: Leaving directory '/tmp/emacs/Work'
make: *** [bootstrap] Error 2
=====================================
The issue is fixed, simply, if I uninstall 'libelf0'. Indeed...
If 'libelf0' is installed, we have from 'configure',
--------
checking for elf_begin in -lelf... yes
--------
and the following test in 'configure' script is true:
--------
if test $ac_have_func = no && test "$ac_cv_lib_elf_elf_begin" = yes; then
ac_have_func=yes
$as_echo "#define SVR4 1" >>confdefs.h
fi
--------
i.e. SVR4 is _defined_. But... 'src/xfaces.c' includes indirectly via
'/usr/include/X11/Xos.h' the header '/usr/include/X11/Xarch.h', which has:
--------
[...]
# if defined(SVR4) || defined(__SVR4)
# include <sys/byteorder.h>
# elif
[...]
--------
i.e. finding SVR4 defined, it searches for 'byteorder.h' in
'/usr/include/sys' and not in '/usr/include/asm', where it lives (*as on
GNU/Linux*[1]), and this leads to the above failure.
What does the Cygwin 'libelf0' maintainer think about these facts?
Thanks,
Angelo.
---
[1] Here Cygwin isn't different frome GNU/Linux Kubuntu 10.04. :-)
- Building Emacs-trunk with gcc >= 4.5.1 and libelf installed,
Angelo Graziosi <=