From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk1-x736.google.com (mail-qk1-x736.google.com [IPv6:2607:f8b0:4864:20::736]) by sourceware.org (Postfix) with ESMTPS id 93F653858410 for ; Tue, 1 Nov 2022 15:38:30 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 93F653858410 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-qk1-x736.google.com with SMTP id k4so6905797qkj.8 for ; Tue, 01 Nov 2022 08:38:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:to:from:subject:message-id:from:to:cc:subject:date :message-id:reply-to; bh=eLBC3Ml74ZFq2t25YP3UWkA1uFCkyuVG5RvX8d9I6Vo=; b=nmoHLEhdtQz6xN6WUq8AJj4frngSgHEp0MhEAzDjr7MzUjhHy5bnPQKr33Ygg5hyvc RlTrswMzNiGvUs2ChnRBKujowYOOJ3b9ZkAY8dTtl/P+QI5wuU+NU5Eo5JOsC8i5SQIp bmHltpx9EgeraR/xFFDUlRLfS7Rva5wO8o+9PVdCFMQ92VCLXCDyVfvWWHG1yQqSCW1u xry2St2gU906/XglW6D1hUs7a8N/zZV6IrS2mlsuI4rapUb1kxnvvJKW/+uuMwSaDHWe sFgZYQczRSo9ODYeIUXHBxo50bDukK2jTTyN7Tok4js1W4wwHbcDwRYUHn7gwdGpJ+Sz tIcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:to:from:subject:message-id:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=eLBC3Ml74ZFq2t25YP3UWkA1uFCkyuVG5RvX8d9I6Vo=; b=VPkiNpw4hOpZNMruf89H1em2F9yqI983wYEyN2GSESt6xDNg/1kWwDZpUYU3FzCnn0 9y40NYhfjKTOLxpCsx4KNDL+7xu3klKP3YTWxJ0NPJZxxRgji53KsvI1SBc+Ev3NxkA9 O8r27Nxli1Z6GKVqnVt4MSX10dsUgZkQ9CWEogl785XS7emD5gDtdel4HQUcJlbtRbGn xMU+VeBdVD22FCkDPpPx2Dz1yIKyNT0AuoSUwqT7dm90acOW38aLAf6JgGA0QstTPNeE S9h297M/0qwwjGZrnIgqaIqNAxw9EPEbFEgdbCHEQ4QS0SQ29P6M4YPoAlysjf9E433B /ZUQ== X-Gm-Message-State: ACrzQf1kpTsjnvGFebKAIweiTtDZjNWe2tPivqJSd9jrYpOuP+LOlLgt aWlkTmVRKjacxeQzu3/zXYo= X-Google-Smtp-Source: AMsMyM7SYitKEHDVpv8evvwtp2eDVNX0yOtroxVqifIr7N80txg9asysfNTMug+HkxD0CUu4ZMho8Q== X-Received: by 2002:a05:620a:916:b0:6fa:2149:c535 with SMTP id v22-20020a05620a091600b006fa2149c535mr10201841qkv.413.1667317109924; Tue, 01 Nov 2022 08:38:29 -0700 (PDT) Received: from lgmac-stevenwu.corp.netflix.com ([192.222.225.228]) by smtp.gmail.com with ESMTPSA id x19-20020ac87ed3000000b0038b684a1642sm5289867qtj.32.2022.11.01.08.38.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Nov 2022 08:38:29 -0700 (PDT) Message-ID: <2ffea2dad5fa4da767276beb397405b1a7b151d1.camel@gmail.com> Subject: Re: Issue with dllexport/dllimport inline function From: xclaesse@gmail.com To: LIU Hao , gcc@gcc.gnu.org Date: Tue, 01 Nov 2022 11:38:28 -0400 In-Reply-To: References: <845fde640ac4cd51c8bb50373f146987b3d26893.camel@gmail.com> <874c106a-41bb-afe6-44a1-d725fdcd583b@126.com> <88c1e389-8d80-38bd-e1fa-e61d2653da8d@126.com> <0c24f08964acc66a402d94c1b6a389dee4efa163.camel@gmail.com> <13cbf2ec-4027-3df7-aa76-3d680afc075b@126.com> <6c5778d2edfaa8b5196ef142ad0339ac6233b641.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,BODY_8BITS,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Thanks a lot for your help. Sorry for late reply, but I gave your trick a try and it did not work: ``` /home/xclaesse/programmation/inline-example/builddir/../foo.h:7: multiple definition of `g_strcmp0'; libfoo.dll.p/foo.c.obj:/home/xclaesse/programmation/inline- example/builddir/../foo.h:7: first defined here ``` Updated the test case there: https://gitlab.gnome.org/xclaesse/inline-example Regards, Xavier Claessens. Le mercredi 12 octobre 2022 =C3=A0 11:03 +0800, LIU Hao a =C3=A9crit=C2=A0: > =E5=9C=A8 2022/10/12 02:37, xclaesse@gmail.com=C2=A0=E5=86=99=E9=81=93: > >=20 > > Build it with: > > =C2=A0=C2=A0 meson setup builddir --cross-file cross_file_mingw64.txt > > =C2=A0=C2=A0 ninja -C builddir/ > >=20 > > And it fails with: >=20 > That's because you compiled it as C. I used g++ to compile these, and > there was no such error. >=20 >=20 > For C, this inline issue is going to be much more messy due to lack > of COMDAT support about=20 > `inline`. Your will need a dedicated macro for each translation unit. > A dirty solution looks like this: >=20 > =C2=A0=C2=A0=C2=A0 ``` > =C2=A0=C2=A0=C2=A0 #ifndef INSIDE_FOO_C > =C2=A0=C2=A0=C2=A0 __attribute__((__dllexport__)) inline > =C2=A0=C2=A0=C2=A0 #endif > =C2=A0=C2=A0=C2=A0 extern > =C2=A0=C2=A0=C2=A0 int > =C2=A0=C2=A0=C2=A0 g_strcmp0(const char*str1, const char*str2) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ... > =C2=A0=C2=A0=C2=A0 ``` >=20 > and in 'foo.c': >=20 > =C2=A0=C2=A0=C2=A0 ``` > =C2=A0=C2=A0=C2=A0 #define INSIDE_FOO_C=C2=A0 1 > =C2=A0=C2=A0=C2=A0 #include "foo.h" >=20 > =C2=A0=C2=A0=C2=A0 extern int g_strcmp0 (const char *str1, const char *st= r2); > =C2=A0=C2=A0=C2=A0 ``` >=20 >=20 > Further reading: > =C2=A0=C2=A0 > https://github.com/lhmouse/mcfgthread/wiki/Differences-between-GNU,-C99-a= nd-C---%60inline%60 >=20 >=20 > --=20 > Best regards, > LIU Hao