compiling glic for ARM9 in Cygwin

J_K_L · 03-12-2009, 12:36 AM

Hi all, I'm currently compiling glibc for my MINI2440 (arm920t). The board is great but using glibc-2.3.2. Now I want to upgrade it to glibc-2.7

glibc version: 2.7
port package patched, linuxthread unused

$ CC=arm-linux-gcc ../glibc-2.7/configure --host=arm-linux --prefix="/usr" --with-headers=${TARGET_PREFIX}/include

Then I see:

Code:

checking for .protected and .hidden assembler directive... yes
checking whether __attribute__((visibility())) is supported... no
configure: error: compiler support for visibility attribute is required

So what does this mean? how to counter this?
Thanks in advance

knudfl · 03-13-2009, 02:31 PM

Welcome to LQ.

What is wrong with glibc 2.3 ... why change it ?
And glibc is not at all easy to change, all applications,
libraries and the kernel depends on it,
glibc is your system ! Installing another glibc will
probably make the system unusable forever.
http://www.gnu.org/software/libc/resources.html

Quote:

Building glibc is quite tricky and has a number of pitfalls, not the least
of which include :

* Never install over a live system. The connection between the individual
parts of the glibc shared libraries is special. The libc.so shared library
uses private interfaces in ld.so and vice versa. On a live system with
dynamically linked applications if a new libc.so replaces an old one with a
different internal ABI your system will be broken. libpthread.so, libm.so, and
librt.so have similar problems. At a minimum, install into a separate chroot
environment.
* There is a high possibility you will end up creating a different public
ABI. If you were to begin distributing binaries they would at a minimum not
work, and at best create a lot of confusion.

If you find yourself needing to build a customised version of glibc, you are
best to use the framework offered by your distribution (i.e. the rpm or deb
package build facilities).

Generally about building 'glibc', please see CLFS
http://trac.cross-lfs.org/
Book : http://cross-lfs.org/view/1.1.0/x86/
http://cross-lfs.org/view/1.1.0/x86/...ols/glibc.html
.....