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.
These notes cover things specific to cross-compiling GLib; for general information about cross-compilation, see the Meson documentation.
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 meson via a ‘cross file’.
As an example of using a cross file, to cross compile for the ‘MingW32’
Win64 runtime environment on a Linux system, create a file
with the following contents:
[host_machine] system = 'windows' cpu_family = 'x86_64' cpu = 'x86_64' endian = 'little' [properties] c_args =  c_link_args =  [binaries] c = 'x86_64-w64-mingw32-gcc' cpp = 'x86_64-w64-mingw32-g++' ar = 'x86_64-w64-mingw32-ar' ld = 'x86_64-w64-mingw32-ld' objcopy = 'x86_64-w64-mingw32-objcopy' strip = 'x86_64-w64-mingw32-strip' pkgconfig = 'x86_64-w64-mingw32-pkg-config' windres = 'x86_64-w64-mingw32-windres'
Then execute the following commands:
meson setup --cross-file cross_file.txt builddir
The complete list of cross properties follows. Most of these won’t need to be set in most cases.
When meson checks if a function is supported, the test can be overridden by setting the
false. For example:
Checking for function “fsync” : YES
can be overridden by setting
have_fsync = false
- Whether the stack grows up or down. Most places will want
false. A few architectures, such as PA-RISC need
- Whether you have
strlcpy()that matches OpenBSD. Defaults to
false, which is safe, since GLib uses a built-in version in that case.
va_listcan be copied as a pointer. If set to
memcopy()will be used. Only matters if you don’t have
__va_copy(). (So, doesn’t matter for GCC.) Defaults to
truewhich is slightly more common than
- Whether you have a
vsnprintf()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
- Whether you have a
snprintf()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