optimization/7708: g++ -O inserts definition of std::string::replace in library module

[Castalia at azstarnet dot com]

>Number:         7708
>Category:       optimization
>Synopsis:       g++ -O inserts definition of std::string::replace in library module
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 23 18:06:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Bradford Castalia
>Release:        gcc version 3.1.1 20020617 (prerelease) [FreeBSD]
>Organization:
>Environment:
FreeBSD idaeim 4.6-STABLE FreeBSD 4.6-STABLE #0: Mon Aug  5 19:42:48 MST 2002

Configured with: ./..//gcc-20020617/configure --disable-nls --with-gnu-as --with-gnu-ld --with-gxx-include-dir=/usr/local/lib/gcc-lib/i386-portbld-freebsd4.6/3.1.1/include/g++ --disable-libgcj --disable-shared --prefix=/usr/local i386-portbld-freebsd4.6
Thread model: posix
>Description:
Use of -O with g++ when compiling a class that uses the
std::string methods replace and/or erase generates a
definition of the replace method in the object file. When
the object file is used as a library module this results
in multiple definition error at link time when the problem
has occured in more than one module.
>How-To-Repeat:
Separate the attached file into Test.h, Test.cpp, and
Makefile files. Use gmake with the Makefile to compile
the object module and place it in the library; or just
compile the object file with "g++ -O -c -o Test.o Test.cpp".
Examine the results with nm. Notice the definition of the
std::string::replace method in the object file. Recompile
without the -O option. Notice that the definition of the
std::string::replace method is no longer present in the
nm report of the object file.
>Fix:
A) Don't use optimization (sigh).
B) Note this "side effect" of optimization in the docs.
C) Prevent optimization from generating method definitions
   not defined by the user code itself.
>Release-Note:
>Audit-Trail:
>Unformatted:
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Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="Test"

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