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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". |
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