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From: RaoulGough@yahoo.co.uk To: gcc-gnats@gcc.gnu.org Subject: c++/6771: no code emitted for locally unused class with dllexport attribute Date: Wed, 22 May 2002 10:16:00 -0000 [thread overview] Message-ID: <20020522171154.23576.qmail@sources.redhat.com> (raw) >Number: 6771 >Category: c++ >Synopsis: no code emitted for locally unused class with dllexport attribute >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Wed May 22 10:16:01 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Raoul Gough >Release: 3.0.4 >Organization: >Environment: Cygwin >Description: *locally* unused class with __attribute__(dllexport) does not emit any code. This is a problem because the corresponding __attribute__(dllimport) in the client module would leave unresolved externals during linking. e.g. namespace { int blah = 0; }; struct __attribute__((dllexport)) foo { void foofunction () { ++blah; } }; generates *no code* for foo::foofunction, but a client module with the corresponding __attribute__(dllimport) would require the code. e.g.: struct __attribute__((dllimport)) bar { void barfunction () { }; }; void __attribute__((dllexport)) blahblah () { bar b; b.barfunction (); } Leaves an unresolved external bar::barfunction. My guess is that barfunction was not inlined because it is dllimport, whereas foofunction was not generated because it is erroneously expected to be inlined. gcc 2.95.3-5 (cygwin special) used to emit the required code. >How-To-Repeat: Don't try to link the attached code - it's cut down too far. Compile the example code with -save-temps and inspect the .s file for the absence of foofunction, and requirement for external barfunction. >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: application/x-gzip-compressed; name="dllexport.tar.gz" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="dllexport.tar.gz" H4sIAJfP6zwCA+1YbW/bNhD2VxnwfyDcDrCb6sWyYmfJPCB1vCRA6gRJmmX7QlAUbXOjJU2kHBtF //uOsuzIRl7aYk2HQg9giHc8PjyeeEfKUyYlGTNpqbmqfCM4LcfpeF7FcZxWd9fJno7X0k+Ndsft Vpyu13Xht+u5YO96rW4FOZUXQCoVSRCqXJIoFU/YfZAskZUfDq+RncrEFhElwvZ5aI93dpA5QyZF gRBsHkeJsihFpiQzZio2jWWteslIwMMxkjGjEo2SaFpkEdy3x5Sa+sk7ex0zpiZdjO+AvG05lmdn w2rVfhSO+DhNWIDuuJrsIxusgoTPmB1ogoxkOYKuTJFpspD4gpmChONU79wefUt3dmrV60kCbqFp FDCxjyT4J1itChxoBm+ORyHKuGrVL/KVxrFjsTlMrCc0qY7OEcbHww/HGPfaS+H2Fh8NLi4H/cPr wVGmGtz2BxfXp+fDq7XF4btTfDO4vAJlDxIiC/KSqX/PpIX3p8PzS1A596qLw+v+ydngZnAGek/r b/c6uNcqtg7lQsL76YHvocqGDs/x6fDsdDjAOJOvro/6+OT8CpzEyyE0Tnu8vdeB5pTQCQ9ZLh7l D4w3GjmRSkOGdbiKcsxCxdNpnES5VqoAQix6GBOlEu6nimHcaKw7MG42M0MaMPqAWaZeGX0u2edw YS3oTdiYN7dN57lJYbXrCPT/OP79dNh2c/1SzIQ05PNMpxt591LHl2+luOd4SEUawI7iAU/ISLFk o3dzFz5m/DUk9l3bJTF/jGvVvZH39wLntSofh1GiMz+MQjbnsDLYakDGqIqSBao/60L9P+DI/QQq yA3Uv7jYTHDUgJyFfG6ixp4Dr+4tend1hOQiVGTefH764flwUPD21SrQdcuy6kgyktAJ0meGkmjC ErZfsPkFbH592OaBDfCgUtdfc9Z+qm8rLE+a+oT+fUeS4Aur3paHD4v5e6hVB2GAotFq3QJian1p laWtWKRyWWhHccKgilC4mcDRUNyAyPwn5QyKWwB1xieSbZ1Rq31gRoUO+XX7JBsD1X5rzKb7YGfQ aBpzAZ76C5QN2hyiQ0EknFsqgUNTgZ4IcxQlU6I2/dzw+cXO/2IAv9P9z+l0vNX9rwOCvv+1u63y /vcSsG1kvjGzW9N+drl5Y9aqtq1/6H0UpGIzx9Z9/SheJHw8UZBGTeQ6jouyCKL3FjqO0vFkbXkC 9QAqa9buLZG19Rgb7dquayTTsfEb5BCicIXTKbIcXKuGZMpkTCiUno+QR4hDrfYFmaAecg5q1U8H 2kiqJKUKbR3ka6/hQB9FUU4wi3igxVEaUj0RajTRR7Szo0kP0KdnKfk0p/RJUqQEcZPy09q9rP8J 5/TU2ZoazZwRyJB/kLWsTWJNWqt+m/zn/Hvlv7fbXn//eW57mf/l99+L4BVquaheTPF6mXbfPu3+ N3iJO8dz+d/tONv573rl+f8iMKwRHLxGvXgOQAWwxiLyBeTPn0P3Z3x8dv7u8AzjIS6anZ38dXtD PJ1EA7gHWwFRRD+JgG8s5NWqnz16Xw8TUTg2HN1SbK7uiVqdojt7q7ydZVOykbGhPDAsSYXhwlMt Yma0dYuFYJe5c2+op4xTORHGT8yPQZhGM92W8VuUa2TqC+P1npblvdxy1wrBiDDMVkPbN7WWzAus maD/mjDeYAwFDOtwtKGwtFqF6jLQ6yBBoJk7a+bcGT9ea+IoXruasCw8ki3rkxXoj9cZ01UPgiYp fCjVkbmM9H5x0fUftIiVKFGiRIkSJUqUKFGiRIkSJUqUeBT/AhFcMZ8AKAAA
next reply other threads:[~2002-05-22 17:16 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-05-22 10:16 RaoulGough [this message] 2002-05-24 5:46 Raoul Gough 2002-11-25 14:36 Raoul Gough 2003-05-01 16:56 Giovanni Bajo
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