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meson: Add wasm build in build scripts

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has_int128_type is set to false on emscripten as of now to avoid errors by
libffi. Tests are disabled on emscripten because they rely on host
features that aren't supported by emscripten (e.g. fork and unix
socket).

Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>
Link: https://lore.kernel.org/r/ad03b3b180335f59e785e930968077bf15c46260.1745820062.git.ktokunaga.mail@gmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Kohei Tokunaga 2025-04-28 15:39:07 +09:00 • committed by Paolo Bonzini
parent 5b78d120ff
commit ccc403ed58
6 changed files with 42 additions and 7 deletions
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29
meson.build
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@ -50,9 +50,9 @@ genh = []
qapi_trace_events = []
bsd_oses = ['gnu/kfreebsd', 'freebsd', 'netbsd', 'openbsd', 'dragonfly', 'darwin']
supported_oses = ['windows', 'freebsd', 'netbsd', 'openbsd', 'darwin', 'sunos', 'linux']
supported_oses = ['windows', 'freebsd', 'netbsd', 'openbsd', 'darwin', 'sunos', 'linux', 'emscripten']
supported_cpus = ['ppc', 'ppc64', 's390x', 'riscv32', 'riscv64', 'x86', 'x86_64',
'arm', 'aarch64', 'loongarch64', 'mips', 'mips64', 'sparc64']
'arm', 'aarch64', 'loongarch64', 'mips', 'mips64', 'sparc64', 'wasm32']
cpu = host_machine.cpu_family()
@ -353,6 +353,8 @@ foreach lang : all_languages
# endif
#endif''')
# ok
elif compiler.get_id() == 'emscripten'
# ok
else
error('You either need GCC v7.4 or Clang v10.0 (or XCode Clang v15.0) to compile QEMU')
endif
@ -470,7 +472,10 @@ endif
# instead, we can't add -no-pie because it overrides -shared: the linker then
# tries to build an executable instead of a shared library and fails. So
# don't add -no-pie anywhere and cross fingers. :(
if not get_option('b_pie')
#
# Emscripten doesn't support -no-pie but meson can't catch the compiler
# warning. So explicitly omit the flag for Emscripten.
if not get_option('b_pie') and host_os != 'emscripten'
qemu_common_flags += cc.get_supported_arguments('-fno-pie', '-no-pie')
endif
@ -514,6 +519,8 @@ ucontext_probe = '''
supported_backends = []
if host_os == 'windows'
supported_backends += ['windows']
elif host_os == 'emscripten'
supported_backends += ['wasm']
else
if host_os != 'darwin' and cc.links(ucontext_probe)
supported_backends += ['ucontext']
@ -902,6 +909,10 @@ if get_option('tcg').allowed()
if not get_option('tcg_interpreter')
error('Unsupported CPU @0@, try --enable-tcg-interpreter'.format(cpu))
endif
elif host_arch == 'wasm32'
if not get_option('tcg_interpreter')
error('WebAssembly host requires --enable-tcg-interpreter')
endif
elif get_option('tcg_interpreter')
warning('Use of the TCG interpreter is not recommended on this host')
warning('architecture. There is a native TCG execution backend available')
@ -2962,7 +2973,9 @@ config_host_data.set('CONFIG_ATOMIC64', cc.links('''
return 0;
}''', args: qemu_isa_flags))
has_int128_type = cc.compiles('''
# has_int128_type is set to false on Emscripten to avoid errors by libffi
# during runtime.
has_int128_type = host_os != 'emscripten' and cc.compiles('''
__int128_t a;
__uint128_t b;
int main(void) { b = a; }''')
@ -3775,6 +3788,8 @@ if have_block
# os-win32.c does not
if host_os == 'windows'
system_ss.add(files('os-win32.c'))
elif host_os == 'emscripten'
blockdev_ss.add(files('os-wasm.c'))
else
blockdev_ss.add(files('os-posix.c'))
endif
@ -4516,7 +4531,11 @@ subdir('scripts')
subdir('tools')
subdir('pc-bios')
subdir('docs')
subdir('tests')
# Tests are disabled on emscripten because they rely on host features that aren't
# supported by emscripten (e.g. fork and unix socket).
if host_os != 'emscripten'
subdir('tests')
endif
if gtk.found()
subdir('po')
endif