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<h2><span class="refentrytitle">Cross-compiling the GLib package</span></h2>
<p>Cross-compiling the GLib Package —
How to cross-compile GLib
</p>
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<div class="refsect1">
<a name="cross"></a><h2>Building the Library for a different architecture</h2>
<p>
Cross-compilation is the process of compiling a program or
library on a different architecture or operating system then
it will be run upon. GLib is slightly more difficult to
cross-compile than many packages because much of GLib is
about hiding differences between different systems.
</p>
<p>
These notes cover things specific to cross-compiling GLib;
for general information about cross-compilation, see the
<span class="application">autoconf</span> info pages.
</p>
<p>
GLib tries to detect as much information as possible about
the target system by compiling and linking programs without
actually running anything; however, some information GLib
needs is not available this way. This information needs
to be provided to the configure script via a "cache file"
or by setting the cache variables in your environment.
</p>
<p>
As an example of using a cache file, to cross compile for
the "MingW32" Win32 runtime environment on a Linux system,
create a file 'win32.cache' with the following contents:
</p>
<pre class="programlisting">
glib_cv_long_long_format=I64
glib_cv_stack_grows=no
</pre>
<p>
Then execute the following commands:
</p>
<pre class="programlisting">
PATH=/path/to/mingw32-compiler/bin:$PATH
chmod a-w win32.cache # prevent configure from changing it
./configure --cache-file=win32.cache --host=mingw32
</pre>
<p>
The complete list of cache file variables follows. Most
of these won't need to be set in most cases.
</p>
</div>
<div class="refsect1">
<a name="cache-file-variables"></a><h2>Cache file variables</h2>
<p><b>glib_cv_long_long_format=[ll/q/I64]. </b>
Format used by <code class="function">printf()</code> and
<code class="function">scanf()</code> for 64 bit integers. "ll" is
the C99 standard, and what is used by the 'trio' library
that GLib builds if your <code class="function">printf()</code> is
insufficiently capable.
Doesn't need to be set if you are compiling using trio.
</p>
<p><b>glib_cv_stack_grows=[yes/no]. </b>
Whether the stack grows up or down. Most places will want "no",
A few architectures, such as PA-RISC need "yes".
</p>
<p><b>glib_cv_working_bcopy=[yes/no]. </b>
Whether your <code class="function">bcopy()</code> can handle overlapping
copies. Only needs to be set if you don't have
<code class="function">memmove()</code>. (Very unlikely)
</p>
<p><b>glib_cv_sane_realloc=[yes/no]. </b>
Whether your <code class="function">realloc()</code> conforms to ANSI C
and can handle <code class="literal">NULL</code> as the first argument.
Defaults to "yes" and probably doesn't need to be set.
</p>
<p><b>glib_cv_have_strlcpy=[yes/no]. </b>
Whether you have <code class="function">strlcpy()</code> that matches
OpenBSD. Defaults to "no", which is safe, since GLib uses a
built-in version in that case.
</p>
<p><b>glib_cv_have_qsort_r=[yes/no]. </b>
Whether you have <code class="function">qsort_r()</code> that matches
BSD. Defaults to "no", which is safe, since GLib uses a
built-in version in that case.
</p>
<p><b>glib_cv_va_val_copy=[yes/no]. </b>
Whether <span class="type">va_list</span> can be copied as a pointer. If set
to "no", then <code class="function">memcopy()</code> will be used. Only
matters if you don't have <code class="function">va_copy()</code> or
<code class="function">__va_copy()</code>. (So, doesn't matter for GCC.)
Defaults to "yes" which is slightly more common than "no".
</p>
<p><b>glib_cv_rtldglobal_broken=[yes/no]. </b>
Whether you have a bug found in OSF/1 v5.0. Defaults to "no".
</p>
<p><b>glib_cv_uscore=[yes/no]. </b>
Whether an underscore needs to be prepended to symbols when
looking them up via <code class="function">dlsym()</code>. Only needs to
be set if your system uses
<code class="function">dlopen()</code>/<code class="function">dlsym()</code>.
</p>
<p><b>ac_cv_func_posix_getpwuid_r=[yes/no]. </b>
Whether you have a getpwuid_r function (in your C library,
not your thread library) that conforms to the POSIX spec.
(Takes a 'struct passwd **' as the final argument)
</p>
<p><b>ac_cv_func_nonposix_getpwuid_r=[yes/no]. </b>
Whether you have some variant of <code class="function">getpwuid_r()</code>
that doesn't conform to to the POSIX spec, but GLib might be able
to use (or might segfault.) Only needs to be set if
<code class="literal">ac_cv_func_posix_getpwuid_r</code> is not set. It's
safest to set this to "no".
</p>
<p><b>ac_cv_func_posix_getgrgid_r=[yes/no]. </b>
Whether you have a getgrgid_r function that conforms to
the POSIX spec.
</p>
<p><b>glib_cv_use_pid_surrogate=[yes/no]. </b>
Whether to use a <code class="function">setpriority()</code> on the PID of
the thread as a method for setting the priority of threads. This
only needs to be set when using POSIX threads.
</p>
<p><b>ac_cv_func_printf_unix98=[yes/no]. </b>
Whether your <code class="function">printf()</code> family supports Unix98
style <code class="literal">%N$</code> positional parameters. Defaults to
"no".
</p>
<p><b>ac_cv_func_vsnprintf_c99=[yes/no]. </b>
Whether you have a <code class="function">vsnprintf()</code> with C99
semantics. (C99 semantics means returning the number of bytes
that would have been written had the output buffer had enough
space.) Defaults to "no".
</p>
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