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([240d:1a:3b6:8b00:eb29:7536:a39f:7476]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a3e3c3a2eesm38240465ad.6.2026.01.13.05.54.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jan 2026 05:55:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1768312502; x=1768917302; 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=KSK09h4xKjsISSidIbADfOirq0TnGihmtXpNzolifyA=; b=cytRlgf4f3q2P1syW8yjAgVk0PFeSrrjg+dur/UXw1smjjaLrkDgfx0M0Wit4Crocr HLK/3JrAJ6UJNjeyPQtEpn/U5TMnL5AbHOSfYvL87bdMZkXglIi+O/cUQ8sgYUGkMyBj M5kcgVCtO86kDpMgmnM2HgnSyRs8Ywtwe41A09YQTzY+XgC6l1BR8hUtHk+RzrXulmo3 dG7nKX064+n0oInPVCXEqEhCWk2tbOtOoWmxhCQ2BRMY0WhHVKERlDg7eMaTk3SSqlfG TU9JN3+DkTw398QTmlA2cOH4WJ9lLXm/jLFrU9tf/OIx8uKVJODTYWrL1MJElDbvZt+P N8kw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768312502; x=1768917302; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=KSK09h4xKjsISSidIbADfOirq0TnGihmtXpNzolifyA=; b=p13ChpW/hLdjM09AH3R5SUtenSiNekCOMYBKGJqPpuPVketBePrMu+gJPwaodM3q0W Qd+TScvMZlB+rBf7v98l/RGa5YaoYoWCPgaz3G/DhEIgl0LpBdkYfvC8Xl+Wz2/Z2g5Y mdZuFYfK7AmRCgc/4dyO/XPLIqOxklK2hItXzMEhn36zzY0RjwfY3WVli/Cmp2MsUkVW OerKee/ijKsw2J9mVBtBlzU3RhqPjz7EsRWhMiL+sxSZ7rHx5MeIqKrlsxLYVTVMFo3A 9/7zJzx1sEbymO2uUmpxryrxwxxx1mrSdMd4YnZVw1ntmgByznGACj9wQZMOlcC2eZID KWew== X-Gm-Message-State: AOJu0YyJfTadhSq+mUGr+sNz0E7c0O+rWcvW4CE70nvmFfH4ZWsST0f8 auuML/4EDzS3218HyrOZzbjrpInl9QiPIjm38CNjWdu/TSv6ovXigQ5+8qG/7Qp/ X-Gm-Gg: AY/fxX4M1wZM4ccJihN5siemaH9WHZMWw+Xqac8pMFTdj/rd9U1vDPflahVEPD54k8w n3IrYlpmkwDYPWBI9kRs/ScJoF2b1pRLTeZnEdjwFQV7UBRhcqF6D+6WDGggWdBf/nvABPwouL8 /sx07gcoPk1TOH4k5aajfWPJMLZHO/5giNxljLASz3XRcNYRAIp5Cj5MDIvoro6ZFV2uxLA+zpY Kh4j/04Z7tMj5KcGnF5OfGDCVS4liNLMaOk7iC/qcObot2leXaaqWCG61W2FtAUYL9h8Gh26xCD tgOHsxkHLaO8hQVYm05IwvBrW8PgUcGcO17AW8jadW8fIIxCjCDX1hCjsgSkfSTtHUHjrVFdDRa lnpt9AxC+ibtNtL0TOryYFYtwIBTIiH9hKgMdUYoqeXbCk/tO3PwSZSubB3xXpb+75GFUUAvCJf 9p2U7iNEw+ZA== X-Google-Smtp-Source: AGHT+IFJ4xNyRvc45LnSLRhtPvJefl/YLACSGyGRmV7U2ClFrkkFuNQTxyRybRiVquiveKU/RSNkEQ== X-Received: by 2002:a17:903:388e:b0:2a2:f0cd:4351 with SMTP id d9443c01a7336-2a3ee4e85f6mr187471985ad.37.1768312502089; Tue, 13 Jan 2026 05:55:02 -0800 (PST) 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 , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Kohei Tokunaga , Stefan Hajnoczi , Pierrick Bouvier , Richard Henderson Subject: [PATCH v5 2/4] configure: Enable to propagate -sMEMORY64 flag to Emscripten Date: Tue, 13 Jan 2026 22:54:29 +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 (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::631; envelope-from=ktokunaga.mail@gmail.com; helo=mail-pl1-x631.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: qemu development 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: 1768312544903158500 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(-) diff --git a/configure b/configure index 92bfc5f976..326d27dab1 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 @@ -521,7 +527,7 @@ case "$cpu" in CPU_CFLAGS=3D"-m32" ;; wasm64) - CPU_CFLAGS=3D"-m64 -sMEMORY64=3D1" + CPU_CFLAGS=3D"-m64 -sMEMORY64=3D$wasm64_memory64" ;; esac =20 @@ -779,6 +785,8 @@ 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" ;; @@ -904,6 +912,8 @@ 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