Differences between C++ 'new' operator and 'malloc()' (NOT a C/C++ question)

Ryan Johnson ryan.johnson@cs.utoronto.ca
Fri Jul 13 13:03:00 GMT 2012


On 13/07/2012 4:25 AM, Al Slater wrote:
> On 12/07/2012 16:59, Claude SIMON wrote:
>> Ryan Johnson wrote:
>>>
>>> [...]
>>>
>>> Sorry, I should have actually looked at the repo before assuming the
>>> test case was a monstrosity. By way of penance, I've now looked,
>>> downloaded, tweaked, and tested it.
>>>
>>> [...]
>>>
>>
>> Thanks for testing.
>>
>> I removed your test results (and the other stuff) from this message, not
>> because I'm not interested into, but because I have a new problem, which
>> prevents me to investigate further the original problem in the light of
>> your test results.
>>
>> Since my last testings, I updated Cygwin, the JDK and the JRE. So, my
>> current configuration is now :
>>
>> Windows Vista 32 bits SP2
>> Cygwin 1.7.15
>> g++ 4.5.3
>> javac 1.7.0_05
>> javah 1.7.0_05
>> java 1.7.0_05
>>
>> When running the test case, I now have :
>>
>> $ java jcmc
>> Loading library 'jcmc'...Exception in thread "main"
>> java.lang.UnsatisfiedLinkError: H:\cvs\epeios\bugs\jcmc\jcmc.dll: 
>> L'accÞs
>> Ó cet emplacement de la mÚmoire n'est pas valide
>>          at java.lang.ClassLoader$NativeLibrary.load(Native Method)
>>          at java.lang.ClassLoader.loadLibrary1(Unknown Source)
>>          at java.lang.ClassLoader.loadLibrary0(Unknown Source)
>>          at java.lang.ClassLoader.loadLibrary(Unknown Source)
>>          at java.lang.Runtime.loadLibrary0(Unknown Source)
>>          at java.lang.System.loadLibrary(Unknown Source)
>>          at jcmc.main(jcmc.java:9)
>>
>> There is a French message which roughly means "The access to this memory
>> location is not valid"
>>
>> I updated the test case to reflect your changes :
>>     - 'Makefile' now generates the '.h' file,
>>     - 'Makefile' does no more contain the '--stdcall-alias' linker flag,
>>     - the '.cpp' contains now the `extern "C"' directive,
>>     - the '.h' is removed from test case, since it's now generated by 
>> the
>> 'Makefiile'.
>>
>> I have the new error message with this modified test case, but also with
>> the original one. I suspect that the French error message is issued by
>> Cygwin or by one of its sub-component, since the JVM never issued a
>> message which wasn't in English, but Cygwin did.
>>
>> So, I have to postpone the study of the 'malloc()' related bug until I
>> manage to resolve this new issue ; I then come back to your test 
>> results.
>> But, meanwhile, if someone has an idea why I have this new error...
>>
>> Here again the address where the test case can be found :
>>     http://cvs.savannah.gnu.org/viewvc/epeios/bugs/jcmc/?root=epeios
>>
>
> Does 
> http://cygwin.com/faq/faq.programming.html#faq.programming.msvs-mingw 
> provide any help?
>

Or, just use mingw-gcc, like I suggested before:
> x86_64-w64-mingw32-g++ -static-libgcc -static-libstdc++ -c -g 
> -Ijdk/include -Ijdk/include/win32 "-D__int64=long long"  jcmc.cpp
>
> [...snip...]
> Mingw is a windows-targeted cross compiler that runs under cygwin but 
> produces native windows binaries, so it doesn't have any posix 
> functions available; the -static flags tell mingw to make a truly 
> stand-alone executable that has only standard windows runtime 
> dependencies. 

Just use i686-pc-mingw32-g++ if you're 32-bit, the rest stays the same.

Ryan


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