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.m...@gmail.com>
---
MAINTAINERS | 1 +
configs/meson/emscripten.txt | 8 ++++++++
configure | 7 +++++++
meson.build | 29 ++++++++++++++++++++++++-----
meson_options.txt | 2 +-
scripts/meson-buildoptions.sh | 2 +-
6 files changed, 42 insertions(+), 7 deletions(-)
create mode 100644 configs/meson/emscripten.txt
V2:
- In meson.build, added a check to ensure TCI is enabled for the wasm build.
- Split the MAINTAINERS file change that adds emscripten.txt from the
previous 19th patch into this commit.
diff --git a/MAINTAINERS b/MAINTAINERS
index 72319f804e..0fb7fd79b6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -625,6 +625,7 @@ S: Maintained
F: include/system/os-wasm.h
F: os-wasm.c
F: util/coroutine-wasm.c
+F: configs/meson/emscripten.txt
Alpha Machines
--------------
diff --git a/configs/meson/emscripten.txt b/configs/meson/emscripten.txt
new file mode 100644
index 0000000000..4230e88005
--- /dev/null
+++ b/configs/meson/emscripten.txt
@@ -0,0 +1,8 @@
+[built-in options]
+c_args = ['-pthread']
+cpp_args = ['-pthread']
+objc_args = ['-pthread']
+# -sPROXY_TO_PTHREAD link time flag always requires -pthread even during
+# configuration so explicitly add the flag here.
+c_link_args =
['-pthread','-sASYNCIFY=1','-sPROXY_TO_PTHREAD=1','-sFORCE_FILESYSTEM','-sALLOW_TABLE_GROWTH','-sTOTAL_MEMORY=2GB','-sWASM_BIGINT','-sEXPORT_ES6=1','-sASYNCIFY_IMPORTS=ffi_call_js','-sEXPORTED_RUNTIME_METHODS=addFunction,removeFunction,TTY,FS']
+cpp_link_args =
['-pthread','-sASYNCIFY=1','-sPROXY_TO_PTHREAD=1','-sFORCE_FILESYSTEM','-sALLOW_TABLE_GROWTH','-sTOTAL_MEMORY=2GB','-sWASM_BIGINT','-sEXPORT_ES6=1','-sASYNCIFY_IMPORTS=ffi_call_js','-sEXPORTED_RUNTIME_METHODS=addFunction,removeFunction,TTY,FS']
diff --git a/configure b/configure
index 02f1dd2311..a1fe6e11cd 100755
--- a/configure
+++ b/configure
@@ -360,6 +360,10 @@ elif check_define __NetBSD__; then
host_os=netbsd
elif check_define __APPLE__; then
host_os=darwin
+elif check_define EMSCRIPTEN ; then
+ host_os=emscripten
+ cpu=wasm32
+ cross_compile="yes"
else
# This is a fatal error, but don't report it yet, because we
# might be going to just print the --help text, or it might
@@ -526,6 +530,9 @@ case "$cpu" in
linux_arch=x86
CPU_CFLAGS="-m64"
;;
+ wasm32)
+ CPU_CFLAGS="-m32"
+ ;;
esac
if test -n "$host_arch" && {
diff --git a/meson.build b/meson.build
index 41f68d3806..a7bffd76d0 100644
--- a/meson.build
+++ b/meson.build
@@ -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; }''')
@@ -3774,6 +3787,8 @@ 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
@@ -4456,7 +4471,11 @@ 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
diff --git a/meson_options.txt b/meson_options.txt
index 59d973bca0..45772484cc 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -34,7 +34,7 @@ option('fuzzing_engine', type : 'string', value : '',
option('trace_file', type: 'string', value: 'trace',
description: 'Trace file prefix for simple backend')
option('coroutine_backend', type: 'combo',
- choices: ['ucontext', 'sigaltstack', 'windows', 'auto'],
+ choices: ['ucontext', 'sigaltstack', 'windows', 'wasm', 'auto'],
value: 'auto', description: 'coroutine backend to use')
# Everything else can be set via --enable/--disable-* option
diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
index 3e8e00852b..0568385f00 100644
--- a/scripts/meson-buildoptions.sh
+++ b/scripts/meson-buildoptions.sh
@@ -80,7 +80,7 @@ meson_options_help() {
printf "%s\n" ' --tls-priority=VALUE Default TLS protocol/cipher
priority string'
printf "%s\n" ' [NORMAL]'
printf "%s\n" ' --with-coroutine=CHOICE coroutine backend to use (choices:'
- printf "%s\n" ' auto/sigaltstack/ucontext/windows)'
+ printf "%s\n" '
auto/sigaltstack/ucontext/windows/wasm)'
printf "%s\n" ' --with-pkgversion=VALUE use specified string as
sub-version of the'
printf "%s\n" ' package'
printf "%s\n" ' --with-suffix=VALUE Suffix for QEMU
data/modules/config directories'
--
2.25.1
