Bug 99236
| Summary: | C++ code containing templated member function with same name as pure virtual member function result in link failure | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Albert Strasheim <albert> |
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> |
| Status: | CLOSED UPSTREAM | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 9 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i686 | ||
| OS: | Linux | ||
| URL: | http://gcc.gnu.org | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2003-07-18 11:24:59 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Attachments: | |||
Created attachment 92959 [details]
C++ source file that exhibits the bug (needs header file too)
Created attachment 92960 [details]
C++ header file that exhibits the bug (also need source file)
Created attachment 92961 [details]
Gzipped preprocessed file
Generated with g++ -save-temps -Wall -ansi -pedantic -I. -o boog boog.cc
Created attachment 92978 [details]
Better code for exposing the bug
Courtesy of Gerhard Esterhuizen <gesterhuizen>
Also filed bug at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11567 because jakub doesn't seem very responsive. This bug has probably been fixed in 3.3.1. Check the gcc bugzilla at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11567 |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 Description of problem: Attached C++ code contains a pure virtual function, unpack(), and a a templated function of the same name (but with different arguments). The presence of the templated function causes linking to fail. Changing the name of the templated function results in successful linking. Implementing the unmarshal() (which calls the pure virtual function, which should result in a call to unpack() implemented in the derived class) function in the header also allows for successful linking, but I think this only hides the bug. Version-Release number of selected component (if applicable): gcc-3.2.2-5 How reproducible: Always Steps to Reproduce: 1. g++ -Wall -ansi -pedantic -I. -o boog boog.cc 2. Linking will fail with the message above. 3. Change "unpack" to something else (grep for FIXME). 4. Repeat 1. Linking succeeds. Actual Results: Linking fails with an undefined reference to a pure virtual function. /tmp/ccxWgvhd.o(.text+0x21): In function `s3_streamable::unmarshal(char const*)': : undefined reference to `s3_streamable::unpack(s3_buffer_base const&)' collect2: ld returned 1 exit status Expected Results: Program should link successfully. Additional info: The same bug seems to exist in gcc 3.2-7. Version info for this version of gcc: [albert@foobar s3fc]$ gcc -v Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/specs Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --host=i386-redhat-linux Thread model: posix gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)