I am taking a programming class and we are required to use the gcc 4.1.2 compiler to compile our c++ projects. I will be creating my projects in xcode and can't find how to set that compiler. I went to the get info window on the project and hit the drop down under Compiler Version, however I do not have 4.1.2 on the list. It seems that this compiler is not installed on my computer. Does anybody know where I can download it and how I can set it as my system default gcc compiler for the term?
You can probably get away with using whatever version of GCC is on your Mac, and doing a final compile on the university machines as a check. In general, the user visible changes using a later version is stricter syntax checking, so you might do something on the Mac that won't pass a newer compiler, but that generally isn't too common. I haven't had to change more than a few lines on our 50k line codebase.
With the current developer tools, only gcc 4.0 and 4.2 are available. You could probably get gcc 4.1.2 via MacPorts, however, I'm not sure whether you can integrate it into XCode.
Before you try this, you should maybe first check with the class instructor whether it is really necessary to use exactly 4.1.2, or if it is OK to use 4.0 resp. 4.2 instead.
Related
Trying to develop simple c++ stuff in xcode for the first time. I haven't done c++ for a while, nor do I usually use a mac so bear with me if this is trivial.
I have simply grabbed the AutoSeededRandomPool example source from here: http://www.cryptopp.com/wiki/RandomNumberGenerator#AutoSeededRandomPool
I used macports to grab libcryptopp +universal (the non universal one didnt work either though), and I have added libcryptopp.a to the 'link binaries with libraries' build phase for my target.
During the build I get 22 errors, which you can see for yourself here: http://i.imgur.com/wIhEQot.jpg
Using xcode 4.6.2 on oldish Lion OS X macbook pro.
Have I missed something obvious here? Thanks for your help
You're not using the correct compiler — The project you mention states the requirement is:
Xcode 3.2.5,
Xcode 4.0 and GCC 4.2,
targeting Apple iOS
...It appears you're using clang++
http://www.cryptopp.com/#platforms
Also this says iOS, not OS X - That could certainly cause some issues as well. Why bother messing with this crypto library anyway? Use Apple's or one that was meant specifically to be used with OS X. It's of course your choice, but it certainly doesn't make it any easier going this route.
I have found the source of the problem was linking with the libc++ standard library rather than the more standard libstdc++ library. Xcode and Mac OS X targets were not a problem.
If I link against libstdc++ then the linking errors disappear. For future reference the giveaway seems to be the std::__1 namespacing visible in the errors, although with hindsight perhaps it should have been obvious that a library ported from linux would most likely be using the libstdc++ library.
I have to write my projects for class in ISO C++ or C++/CLI and while the professor explains how to accomplish this in Windows, it is very difficult to know how to setup the equivalent on my Mac. I am currently running xCode 5.0.2 and it seems to compile the sample applications with no problem using the LLVM 5.0 compiler. I've read that Apple no longer supports GCC compiler, so my question is are the two compilers equivalent? Will code that runs in GCC compiler also work in the LLVM 5.0 compiler?
There is no LLVM 5.0. The LLVM project is currently at version 3.4. The Apple LLVM/Clang variant shipped with XCode 5 may carry a version number that corresponds to the XCode version, but that is mildly misleading.
That said, yes, most stuff that works with GCC 4.2 (the last one that Apple shipped) will work just fine with LLVM/Clang.
C++/CLI, on the other hand, is a Microsoft-proprietary thing and you will not be able to use it on a Mac no matter what, and neither GCC nor Clang support it.
Will code that runs in GCC compiler also work in the LLVM 5.0
compiler?
If by "runs" you mean "compiles," then yes, assuming your code is Standard-compliant.
Weather or not your code is Standard-complliant depends, in part, on how well your professor is doing his job.
Mostly. Being compatible with GCC is one of Clang's primary goals (see http://clang.llvm.org/features.html#gcccompat ). That said, you can install gcc via MacPorts, http://www.macports.org/ if you really need it.
I am using GCC to compile a C++ application on Ubuntu 13. I want to be able to use C++11 features in my code, but at the same time still be able to produce a binary that my users can run on older versions of Ubuntu.
If I compile on Ubuntu 13 with the latest version of GCC my binary will not run on Ubuntu 12 since glibc is not forward compatible:
(How compatible are different versions of glibc?)
What are my options?
Is this even possible without requiring my users to jump through massive hoops?
If not, what do my users have to do to be able to run the binary (i.e. can they install the newer glibc on the older version of Ubuntu)?
Note: I don't not want to consider statically linking glibc since:
I've read that this is a very bad idea
Licensing issues
Cross-distribution compatibility issues
Currently my application does not use any C++11 features and I compile on an older version of Ubuntu with an older version of GCC to avoid this problem. But it makes me sad not being able to use the latest and greatest language features :(
You can try to use Boost Libraries which have quite the same features as C++11 and is "more retro-compatible" than C++11 : it will easily compile on older version of Ubuntu.
Otherwise the best option might be to ask to the users of Ubuntu 12.04 to upgrade there GCC from 4.6 to 4.7 or more recent :
http://www.swiftsoftwaregroup.com/upgrade-gcc-4-7-ubuntu-12-04/
You are asking "how do I use code that isn't on older systems".
The answer is of course, "Include the code with your project".
If you think through what you're asking, you'll realize that in any case, you'll need the code for the c++11 functions in libstdc++. So if they aren't on ubuntu 12, YOU have to add them. Therefore, you'd have to have it statically linked. it's the only way to ensure it will run on an arbitrary ubuntu12 system.
Well you could make a fancy installation, but in the end, it'd just be your apps "dynamically linking" to the libstdc++, so it may as well be statically linked, since no other program is going to be looking for it on ubuntu12
In general, a c++ library is compatible only if the same compiler is used and (!) the versions of the compilers are matching (you might be lucky, though). There is no way to be portable in this sense, besides writing C-code.
My university professor has given a requirement for us in his c++ class: We must write our programs using the gnu C++ compiler (GCC). I understand that after installing xcode, I get an apple version of gcc. However, this is not fully cross compatible as I understand. So I have tried to install the gnu gcc compiler by using mac ports, but I have been unsuccessful. After doing:
port install gcc47
When I go to the terminal and run:
gcc47 -v
I get "command not found"
When I run:
gcc -v
I get:
gcc version 4.2.1 (Apple Inc. build 5666) (dot 3)
Showing that I am still using apple's version. The part I am not understanding is:
How do I install gcc (the gnu version, not apple's version)
How do I use it with an ide, such as eclipse?
The version of GCC you use (Apple or gnu native) should be irrelevant for you to proceed.
Writing portable C++ has nothing to do with the compiler--outside of ensuring your compiler does it's best to adhere to the C++ standard. Luckily enough, GCC is one of the best C++ compilers out there.
You're not looking to do cross-platform C++ per-se, because true portable C++ is somewhat of a pain to write given the various state of C++ compilers for various systems (for example the CC on VAX/VMS doesn't support templates...). I suspect what you want to do is ensure the code you write on your mac, can be compiled by your prof. As long as GCC can handle it on your mac, it should be fine.
So to your specific questions:
Your first question is unnecessary, as you can use apple's supplied g++ to compile your code.
For your second question, I would highly recommend against using an IDE while trying to learn. IDE's offer some really great time saving features, but they hide some important aspects, that I believe are worth struggling with early in your learning process, and which will help strengthen your C++ skills. And while things have certainly have gotten better, some IDE's were notorious for creating non-portable C++ (ie using void main()).
If you are still set on using Eclipse, or XCode, since it doesn't matter which GCC installation you use, the default setup should work just fine.
I've run into troubles installing gcc47 via ports in the past, but gcc46 went as expected. You may also want to install gcc_select.
From there, you can use gcc_select, or specify the path explicitly in Eclipse's toolchain editor.
Other notes:
If you don't need C++11 features, then Apple's GCC 4.2.1 should work fine. Perhaps you can detail why you can't use it. Basically, Apple's added some extensions to the toolchain in some cases (marked APPLE_ONLY), and you have good control of what options are enabled/disabled.
Recent versions of Clang which ship with Xcode handle C++ well (including some support for C++11). There are some advanced things in GCC that I miss when using Clang, but Clang's current C++ support is really quite good.
I would like to jump in learn C++0x, which has matured to a level I'm happy with.
Xcode on Snow Leopard 10.6 is currently at GCC 4.2.1, and the new features I'd like to try, like std::shared_ptr, lambdas, auto, null pointer constant, unicode string literals, and other bits and pieces, require at least 4.3 (I believe).
Ideally I'd use Xcode but I'm not even sure if you can manually upgrade the compiler for Xcode. Is this possible?
Otherwise, what is the best way to install a different version of GCC that doesn't interfere with the rest of the system?
I ended up downloading the latest Intel Compiler for Mac trial, and it does what I need. It's a good way to test the waters without messing with your system.
http://software.intel.com/en-us/intel-compilers/
You may want to look at LLVM and Clang and see if those can accomplish what you're after, if you want to use XCode. Apple has been making a shift away from GCC and towards LLVM/Clang due to licensing reasons.