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https://issues.apache.org/jira/browse/STDCXX-338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12534094
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Farid Zaripov commented on STDCXX-338:
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I have updated gcc up to 4.2.0 version and got the same linked error while
building the examples and tests, but with multiple definitions of the
std::bad_cast::what(), std::bad_typeid::what(), std::bad_alloc::what(),
std::bad_exception::what().
The possible solution is #undefine _RWSTD_NO_BAD_CAST_WHAT,
_RWSTD_NO_TYPEID_CAST_WHAT, _RWSTD_NO_BAD_ALLOC_WHAT,
_RWSTD_NO_BAD_EXCEPTION_WHAT for Cygwin, but I want to ask why we define the
std::bad_xxx::dtor() in BAD_ALLOC_ASSIGNMENT.cpp?
etc/src/BAD_ALLOC_ASSIGNMENT.cpp, line 123:
----------------
...
# else // if !defined (TEST_DTOR)
~bad_alloc () { }
# if defined (TEST_COPY_CTOR)
...
----------------
When I've commented this definition, the examples and tests are built without
miltiple definitions linker errors.
> [Cygwin] linker errors due to multiple definition of `std::exception::what()'
> -----------------------------------------------------------------------------
>
> Key: STDCXX-338
> URL: https://issues.apache.org/jira/browse/STDCXX-338
> Project: C++ Standard Library
> Issue Type: Bug
> Components: Configuration
> Affects Versions: 4.1.3
> Environment: Cygwin
> Reporter: Mark Brown
> Assignee: Martin Sebor
> Fix For: 4.2
>
>
> When linking with stdcxx on Cygwin I get errors like:
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/libsupc++.a(eh_exception.o):(.text+0x80):
> multiple definition of `std::exception::what() const'
> The config.log file shows these errors for the EXCEPTION_WHAT test:
> gcc -c -pedantic -nostdinc++ -g -Wall -W -Wcast-qual -Winline -Wshadow
> -Wwrite-strings -Wno-long-long -Wcast-align -D_RWSTDDEBUG -D_RWSTD_USE_CONFIG
> -I. /build
> /sebor/stdcxx-4.1.3/etc/config/src/EXCEPTION_WHAT.cpp
> In file included from
> /home/mbrown/stdcxx-4.1.3/etc/config/src/EXCEPTION_WHAT.cpp:10:
> /home/mbrown/stdcxx-4.1.3/etc/config/src/BAD_ALLOC_ASSIGNMENT.cpp:83:
> warning: `class std::exception' has virtual functions but non-virtual
> destructor
> /home/mbrown/stdcxx-4.1.3/etc/config/src/BAD_ALLOC_ASSIGNMENT.cpp:333:
> warning: unused parameter 'rhs'
> /home/mbrown/stdcxx-4.1.3/etc/config/src/BAD_ALLOC_ASSIGNMENT.cpp:388:
> warning: unused parameter 'rhs'
> gcc EXCEPTION_WHAT.o -lm -lsupc++ -o EXCEPTION_WHAT
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/libsupc++.a(eh_exception.o):(.text+0x0):
> multiple definition of `std::exception::~exception()'
> EXCEPTION_WHAT.o:/home/mbrown/stdcxx-4.1.3/etc/config/src/BAD_ALLOC_ASSIGNMENT.cpp:(.text$_ZNSt9exceptionD2Ev[std::exception::~exception()]+0x0):
> first defined here
> collect2: ld returned 1 exit status
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