jsoncpp-devel Mailing List for json-cpp

On Sun, Jul 28, 2013 at 8:01 PM, Joakim Hove <jo...@st...> wrote:

>  As you can see I have a very old version of g++ (4.1.2). I am in a
> corporate environment and it is quite painful to get a newer version – do
> you think this can be the problem?
>

i don't know if this will help, but a quick google reveals several people
complaining of buggy gcc 4.1 behaviours at specific optimization levels.
Maybe try with, e.g. -O0 and -O2?

http://de.comp.lang.c.narkive.com/dl6LsJPL/ot-gcc-4-1-1-buggy-optimierungsstufe-3

that thread has a bit about "the optimizing away of a function which
provably has no side effect":

'Das "wegoptimieren von Funktionen, die gemaess ihrer Spezifikation keine
Nebenwirkungen haben" ist kein Fehler.'

(sorry, didn't find a decent english one.)

which might be what's happening to you? That shouldn't cause a segfault,
but it might be related.

-- 
----- stephan beal
http://wanderinghorse.net/home/stephan/
http://gplus.to/sgbeal

Hello,

I have downloaded jsoncpp and successfully built it; I also issued the command "scons platform=linux-gcc check" to run the tests - the all passed.

I then created my own program to actually test this; the program compiles and links fine - but it goes down witn SIGSEGV when running. My program is

#include <json/json.h>

void parseJson() {
    Json::Reader reader;
}

int main(int argc , char ** argv) {
    parseJson();
    exit(0);
}

I.e. it is very simple stuff. When I try putting the Json::Reader instance in the boyd of main{...} it seems to work.  A backtrace from gdb is inlined below:

#0  0x0000003a560b7672 in __gnu_cxx::__exchange_and_add () from /usr/lib64/libstdc++.so.6
#1  0x0000000000403313 in std::string::_Rep::_M_dispose (this=0xffffffffffffffe9, __a=@0x7fff7fb14957)
    at /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/basic_string.h:232
#2  0x0000000000403360 in ~basic_string (this=0x7fff7fb14ab0)
    at /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/basic_string.h:478
#3  0x00000000004039fe in ~Reader (this=0x7fff7fb149b0) at /private/joaho/Parser/opm-parser/external/json/json-cpp/include/json/reader.h:23
#4  0x0000000000402aba in parseJson () at /private/joaho/Parser/opm-parser/opm/parser/eclipse/ExternalTests/ExternalTests.cpp:50
#5  0x0000000000402ad5 in main (argc=1, argv=0x7fff7fb14bc8)
    at /private/joaho/Parser/opm-parser/opm/parser/eclipse/ExternalTests/ExternalTests.cpp:55

As you can see I have a very old version of g++ (4.1.2). I am in a corporate environment and it is quite painful to get a newer version - do you think this can be the problem?

Regards Joakim



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