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([240d:1a:3b6:8b00:561f:1400:11f5:714b]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-32750bc341asm1749747a91.19.2025.08.26.09.11.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Aug 2025 09:11:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1756224682; x=1756829482; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ZrW0ohTHwOsnEYUw7cM8Ny+LWm/AdAq2m0G/QyQL0Os=; b=bywpoZfF+mz51FQodaQwK4Sz4j8l0q0hcnQKlM+WmLx/40GMZwYlZCZ2q0b+Z0zZqo F92/Q0lSPlOOBmCchRl9kdFIXN3M4Zp6YUD5IlH4DqsWNG5fjJZ0VnY0n+CgAL/oohHz VdYQ9O1vdDokqzA6fbXmdjKwyCJpQasJf6aPfttjPu6tDmldbIrG6s5bE+SHJt2Y5L3E zUSZD/7nPMCW5u39/d2kEnmkkDqjMxw9boH4YP5W/yqy/FsNnIAH8ueBgFHYXsERmpcn 6Dsqr2QlHBhO2fN3l/uz41+zN8UziS8dc5pxnCb1Wvr4zxBlluZUIEhp1qouK4fUva01 vHHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756224682; x=1756829482; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ZrW0ohTHwOsnEYUw7cM8Ny+LWm/AdAq2m0G/QyQL0Os=; b=GuHz3TojYNEoLGE6X0y6WMJ7RvrAyJvDDAUDI4AyylOLC8NBlEMc+qDYJnfwh2JUC+ aQoFmSD625Cgig0W9J844pQBnCtDIOCJv5InV4vQqk0WnKPtCEMBWUUTsqwanLWvO9op nwZJ6HuFZSqE7qHbG4gWWpVc2nVW3CG4Yg+adBVfCEQxVraz59wepmuu/DuH9CAAZcEF rfQ34Ey1EgnX8lKYK4yO7If/5+EklGhCMpCjNpTW3o2RHsTz8cZXRJea+ulHRxK2g4VH /C3LAfHq06lwSlCidiiZiVuj2NuY5X2ixaxLtq7K4B582jjBUmlcJtR+h87oCB/Nru3z +AuA== X-Forwarded-Encrypted: i=1; AJvYcCVcj4SLtUWapioecYt1dOopVGGtM2eG/KK0dRGUIxzoYnIuEMpOUvfiDK6SrQ87EU7UtcLuxODiAw==@nongnu.org, AJvYcCWbiCOA/NfII7O+E4HdN1HRjIxfcOteMZlCMsj63tNsYfax8Zs0nKlT0Fq35r9HuNHHFQAq5Y5BVYue6w==@nongnu.org X-Gm-Message-State: AOJu0Yx9c4S2cAiU2u8phxvfu+1fHxv2avnUEm722l7UM8zuazQvTlbE KvCmn4UeIYdd4+TgTBZWep2xmph0mNqCF0At8vSWpBqB6N32xdjU0T9+UVRyCg== X-Gm-Gg: ASbGnctcApBOmMwA8Gi0jwSnDPWXxP7++DRtq0zBzlzdLv457uO68BZWtDlUXzbLPxQ o5Pjaj7bR2kTN8B1S9QI6hdVOZPc9Qu++8l3Y6QxbYc6b1hKgYuSm7Jv4gReJzBuhsFHYV7LlXk ec7LpB6cx7JozOWyMebPChYyzul6JJmK1j52IFz0/FKqmrMJocbHsXSb64hy4D3glBWijOCYJru 7rCK0fAoTDGOa+ieTBJTl0294qqrrT8Ucrr9c1vf2OAu0D1eOMWV4clOaMSJqo0fbRUWbeWzMOl wv/lsZHn0cKiDqTBEZIJVF5t1iQUH6Uh9zwUwIoL1g9WJahM91eCN4tEWlRLoy9/dQVsariCO2l YnAWzeLc1p2FhASA2AcJmLKZJgGIe8hR8 X-Google-Smtp-Source: AGHT+IGAlvqNgsQl2TNqNuU738NlBWs70byFFGw6TIDKRnpz8MoeUjGd0ays7mMpgVaUtX0Jp61xRw== X-Received: by 2002:a17:90b:4b8d:b0:325:3ada:b385 with SMTP id 98e67ed59e1d1-3275085f383mr2517991a91.8.1756224681831; Tue, 26 Aug 2025 09:11:21 -0700 (PDT) From: Kohei Tokunaga To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Thomas Huth , Paolo Bonzini , Richard Henderson , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , WANG Xuerui , Aurelien Jarno , Huacai Chen , Jiaxun Yang , Aleksandar Rikalo , Palmer Dabbelt , Alistair Francis , Stefan Weil , qemu-arm@nongnu.org, qemu-riscv@nongnu.org, Stefan Hajnoczi , Pierrick Bouvier , ktokunaga.mail@gmail.com Subject: [PATCH v2 02/35] configure: Enable to propagate -sMEMORY64 flag to Emscripten Date: Wed, 27 Aug 2025 01:10:07 +0900 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::535; envelope-from=ktokunaga.mail@gmail.com; helo=mail-pg1-x535.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1756225261670116600 Currently there are some engines that don't support wasm64 (e.g. unsupported on Safari[1]). To mitigate this issue, the configure script allows the user to use Emscripten's compatibility feature, "-sMEMORY64=3D2" flag[2]. Emscripten's "-sMEMORY64=3D2" flag still enables 64bit pointers in C code. = But this flag lowers the output binary into wasm32, with limiting the maximum memory size to 4GB. So QEMU can run on wasm32 engines. [1] https://webassembly.org/features/ [2] https://emscripten.org/docs/tools_reference/settings_reference.html#mem= ory64 Signed-off-by: Kohei Tokunaga Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Pierrick Bouvier --- configure | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) V2: - This commit is under review in another patch series so please ignore it here. diff --git a/configure b/configure index 112e4725fc..8ac6cacc06 100755 --- a/configure +++ b/configure @@ -182,6 +182,10 @@ EXTRA_CXXFLAGS=3D"" EXTRA_OBJCFLAGS=3D"" EXTRA_LDFLAGS=3D"" =20 +# The value is propagated to Emscripten's "-sMEMORY64" flag. +# https://emscripten.org/docs/tools_reference/settings_reference.html#memo= ry64 +wasm64_memory64=3D1 + # Default value for a variable defining feature "foo". # * foo=3D"no" feature will only be used if --enable-foo arg is given # * foo=3D"" feature will be searched for, and if found, will be used @@ -239,6 +243,8 @@ for opt do ;; --without-default-features) default_feature=3D"no" ;; + --wasm64-32bit-address-limit) wasm64_memory64=3D"2" + ;; esac done =20 @@ -537,7 +543,7 @@ case "$cpu" in CPU_CFLAGS=3D"-m32" ;; wasm64) - CPU_CFLAGS=3D"-m64 -sMEMORY64=3D1" + CPU_CFLAGS=3D"-m64 -sMEMORY64=3D$wasm64_memory64" ;; esac =20 @@ -795,6 +801,8 @@ for opt do ;; --disable-rust) rust=3Ddisabled ;; + --wasm64-32bit-address-limit) + ;; # everything else has the same name in configure and meson --*) meson_option_parse "$opt" "$optarg" ;; @@ -920,6 +928,8 @@ Advanced options (experts only): --disable-containers don't use containers for cross-building --container-engine=3DTYPE which container engine to use [$container_eng= ine] --gdb=3DGDB-path gdb to use for gdbstub tests [$gdb_bin] + --wasm64-32bit-address-limit Restrict wasm64 address space to 32-bit (de= fault + is to use the whole 64-bit range). EOF meson_options_help cat << EOF --=20 2.43.0