DEPRECATION: c_args in the [properties] section of the machine file is deprecated, use the [built-in options] section - meson-build

Question

Here is cross-file example I use for cross compiling with meson build system. It is passed to meson with --cross-file option.
[host_machine]
system = 'linux'
cpu_family = 'arm'
cpu = ''
endian = 'little'
[binaries]
c = 'arm-linux-gnueabihf-cc'
cpp = 'arm-linux-gnueabihf-g++'
ld = 'arm-linux-gnueabihf-ld'
ar = 'arm-linux-gnueabihf-ar'
strip = 'arm-linux-gnueabihf-strip'
pkgconfig = 'pkg-config'
[properties]
c_args = ['-march=armv7-a', '-mtune=cortex-a9', '-mlittle-endian', '-I/sysroot/usr/include']
cpp_args = ['-march=armv7-a', '-mtune=cortex-a9', '-mlittle-endian', '-I/sysroot/usr/include']
c_link_args = ['-march=armv7-a', '-mtune=cortex-a9', '-mlittle-endian', '-L/sysroot/lib', '-Wl,-rpath-link=/sysroot/staging/lib', '-L/sysroot/usr/lib', '-Wl,-rpath-link=/sysroot/usr/lib']
cpp_link_args = ['-march=armv7-a', '-mtune=cortex-a9', '-mlittle-endian', '-L/sysroot/lib', '-Wl,-rpath-link=/sysroot/staging/lib', '-L/sysroot/usr/lib', '-Wl,-rpath-link=/sysroot/usr/lib']
It worked fine. But after upgrading meson to the newest version, I get the following warnings:
DEPRECATION: c_args in the [properties] section of the machine file is deprecated, use the [built-in options] section.
DEPRECATION: cpp_args in the [properties] section of the machine file is deprecated, use the [built-in options] section.
DEPRECATION: c_link_args in the [properties] section of the machine file is deprecated, use the [built-in options] section.
DEPRECATION: cpp_link_args in the [properties] section of the machine file is deprecated, use the [built-in options] section.
How can I fix this?

Answer 1

Just rename [properties] section to [built-in options]:
[built-in options]
c_args = ['-march=armv7-a', '-mtune=cortex-a9', '-mlittle-endian', '-I/sysroot/usr/include']
cpp_args = ['-march=armv7-a', '-mtune=cortex-a9', '-mlittle-endian', '-I/sysroot/usr/include']
c_link_args = ['-march=armv7-a', '-mtune=cortex-a9', '-mlittle-endian', '-L/sysroot/lib', '-Wl,-rpath-link=/sysroot/staging/lib', '-L/sysroot/usr/lib', '-Wl,-rpath-link=/sysroot/usr/lib']
cpp_link_args = ['-march=armv7-a', '-mtune=cortex-a9', '-mlittle-endian', '-L/sysroot/lib', '-Wl,-rpath-link=/sysroot/staging/lib', '-L/sysroot/usr/lib', '-Wl,-rpath-link=/sysroot/usr/lib']
https://mesonbuild.com/Machine-files.html
Changed in 0.56.0 putting <lang>_args and <lang>_link_args in the properties section has been deprecated, and should be put in the built-in options section.
Before 0.56.0, <lang>_args and <lang>_link_args must be put in the properties section instead, else they will be ignored.
Meson built-in options can be set the same way:
[built-in options]
c_std = 'c99'