Hey,
Since you're building your test case with a C++14 compiler, you probably
didn't build Wt with the same compile flags.
See the WT_CPP_11_MODE CMake flag for building Wt.
Regards,
koen
2015-07-15 16:06 GMT+02:00 K. Frank <kfrank2...@gmail.com>:
> Hello List!
>
> I get "duplicate section ... has different size" messages when I
> build a Wt application that contains (as far as I can tell) a call
> to:
>
> internalPathChanged().connect (...);
>
> First question: Do I care?
>
> My tool-chain does not flag this as a warning or error, and my
> very simple Wt apps (that I don't really know how to test) seem
> to work.
>
> Second: Can I make this go away?
>
> Third: Does anyone else care? I could try to provide more
> information if someone could tell me what to look for.
>
> Details:
>
> This is wt-3.3.3 built with mingw-w64 on 64-bit windows 7:
>
> C:\...\wt_test>g++ --version
> g++ (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 4.9.2
>
> When I build (link) my test program, I get the following par of messages:
>
> C:\...\wt_test>g++ -std=gnu++14 -o section section.cpp -lwt
> -lwthttp -lboost_date_time-mgw49-1_57 -lboost_filesystem-mgw49-1_57
> -lboost_program_options-mgw49-1_57 -lboost_random-mgw49-1_57
> -lboost_regex-mgw49-1_57 -lboost_system-mgw49-1_57
> -lboost_thread-mgw49-mt-s-1_57 -lws2_32 -lwsock32
> C:/.../wt-3.3.3_install/WT/lib/../lib/libwt.a(WApplication.obj):
> duplicate section
>
> `.rdata$_ZTIN5boost8signals26signalIFvSsN2Wt7NoClassES3_S3_S3_S3_ENS0_19optional_last_valueIvEEiSt4lessIiENS_8functionIS4_EENS9_IFvRKNS0_10connectionESsS3_S3_S3_S3_S3_EEENS0_5mutexEEE[_ZTIN5boost8signals26signalIFvSsN2Wt7NoClassES3_S3_S3_S3_ENS0_19optional_last_valueIvEEiSt4lessIiENS_8functionIS4_EENS9_IFvRKNS0_10connectionESsS3_S3_S3_S3_S3_EEENS0_5mutexEEE]'
> has different size
> C:/.../wt-3.3.3_install/WT/lib/../lib/libwt.a(WMenu.obj): duplicate
> section
> `.rdata$_ZTIN5boost8signals26signalIFvSsN2Wt7NoClassES3_S3_S3_S3_ENS0_19optional_last_valueIvEEiSt4lessIiENS_8functionIS4_EENS9_IFvRKNS0_10connectionESsS3_S3_S3_S3_S3_EEENS0_5mutexEEE[_ZTIN5boost8signals26signalIFvSsN2Wt7NoClassES3_S3_S3_S3_ENS0_19optional_last_valueIvEEiSt4lessIiENS_8functionIS4_EENS9_IFvRKNS0_10connectionESsS3_S3_S3_S3_S3_EEENS0_5mutexEEE]'
> has different size
>
> This seems to have something to do with boost signals or boost
> connection. As mentioned above, this happens when I have an
> internalPathChanged().connect (...); call in my program. (See the
> test program, below, for explicit detail.)
>
> I built boost and the Wt libraries using the documented build procedures,
> using the same tool-chain that I use for my test program. The compile
> options I used for my test program are given in the compile command line
> shown above, and the compile options used for boost and Wt are whatever
> the standard build procedure had configured. (I didn't do anything
> special.)
>
> The duplicate-section messages seems to be complaining about
> WApplication.obj and WMenu.obj. These were compiled at the same time
> when I built the Wt libraries all at once, so presumably they were compiled
> with the same compiler options (but the standard build procedure could
> have used different options for some reason).
>
> My test program appears below. Note that not all connect calls trigger
> this
> issue. If I comment out the line:
>
> internalPathChanged().connect (this, SectionApp::dummy);
>
> the duplicate-section messages go away.
>
> (Note, none of the WPushButton stuff is necessary to trigger the
> issue. If I comment out all of the WPushButton stuff, the issue
> persists. I only included the WPushButton example to show that
> button_->clicked().connect (this, SectionApp::dummy); doesn't
> trigger the issue.)
>
>
> Thanks.
>
>
> K. Frank
>
>
> section.cpp:
>
> ====================
>
> #include <Wt/WApplication>
> #include <Wt/WEnvironment>
> #include <Wt/WPushButton>
>
> using namespace Wt;
>
> class SectionApp : public WApplication {
> public:
> SectionApp (const WEnvironment& env) : WApplication (env) {
> setTitle ("Section Test");
>
> // this line triggers "duplicate section"
> internalPathChanged().connect (this, SectionApp::dummy);
>
> button_ = new WPushButton ("button", root());
> // this line does not
> button_->clicked().connect (this, SectionApp::dummy);
> }
> void dummy() {}
>
> private:
> WPushButton *button_;
>
> };
>
> WApplication *createApplication(const WEnvironment& env) {
> return new SectionApp (env);
> }
>
> int main (int argc, char *argv[]) {
> return WRun (argc, argv, &createApplication);
> }
>
> ====================
>
>
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