I'm trying to compile a CMake project which uses
set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-Wall -std=gnu++0x")
in the CMakeLists.txt file under MacOS X Lion. I have installed XCode 4.2.1. but the compiler fails with this:
cd something/src/lib && /usr/bin/c++ -Dlib_ginacra_EXPORTS -Wall -std=gnu++0x -fPIC -o CMakeFiles/lib_ginacra.dir/utilities.cpp.o -c something/src/lib/utilities.cpp
cc1plus: error: unrecognized command line option "-std=gnu++0x"
The compiler's verion is:
c++ --version
i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)
GCC 4.2 is ancient, but Apple don't ship a newer version.
You can either install a modern GCC from somewhere like Mac Ports (which is probably simpler and quicker) or build it yourself following the instructions at http://gcc.gnu.org/wiki/InstallingGCC
For Lion users facing this issue:
Download and Install the MacPorts-2.2.1-10.7-Lion.pkg MacPorts
installer package from here
in a terminal, search for newer GCC versions:
$ port search --name --glob 'gcc*'
install a newer version (I went with gcc5)
$ sudo port install gcc5
get the name of your new version, and set it as default
$ port select --list gcc
Available versions for gcc:
llvm-gcc42
mp-gcc5
none (active)
$ sudo port select --set gcc mp-gcc5
open a new terminal and validate you're updated:
$ c++ --version
c++ (MacPorts gcc5 5.2.0_0) 5.2.0
Most of you getting that error "cc1plus: error: unrecognized command line option -std=gnu++0x" while installing nodejs extension which requires C++ compilation with node-gyp.
So how to solve this error so here is the solution. Basically you get these errors because of Nodejs different version as many node libraries requires C or C++ compilation while installing. So Nodejs older version uses python 2.7 with gcc compiler less than version 4.2 but Nodejs newer version uses gcc44 compiler that's why you get above error while installing any nodejs library.
So you need to degrade your nodejs and node-gyp version and specify the python version if you have multiple python versions installed on your system and then you will not get above error anymore.
Click here to see full tutorial
Related
I recently installed gcc#5 from homebrew. When I type g++ --version it shows that I have 4.2.1 installed and from brew list it shows that I have gcc#5. I want to be able to compile code with the latest g++ version so that I can have access to c++11. I tried switching over to my usr/bin folder and trying to change my g++ version with sudo ln -s -f g++-#5 g++ but it leaves me with this error: ln: g++: Operation not permitted. I don't want to constantly type g++ -std=c++11 test.cpp - o test every time I want to compile my program with c++11 specific keywords such as =default.
I have macOS Sierra and I'm pretty new to macOS. I appreciate any help!
$ gcc 12.c -fopenmp
12.c:9:9: fatal error: 'omp.h' file not found
#include<omp.h>
^
1 error generated.
While compiling openMP programs I get the above error. I am using OS X Yosemite. I first tried by installing native gcc compiler by typing gcc in terminal and later downloaded Xcode too still I got the same error. Then I downloaded gcc through:
$ brew install gcc
Still I'm getting the same error. I did try changing the compiler path too still it shows:
$ which gcc
/usr/bin/gcc
So how do I compile programs with gcc?
EDIT: As of 13 Aug 2017 the --without-multilib option is no longer present in Homebrew and should not be used. The standard installation
brew install gcc
will provide a gcc installation that can be used to compile OpenMP programs. As below it will be installed into /usr/local/bin as gcc-<version>. The current gcc version available from Homebrew (as of writing) will install as gcc-8. You can compile programs with OpenMP support using it via
gcc-8 -fopenmp hello.c
Alternatively you could put an alias in your .bashrcfile as
alias gcc='gcc-8'
and then compile using
gcc -fopenmp hello.c
Note: I'm leaving the original post here in case it is useful to somebody.
The standard gcc available on OS X through XCode and Clang doesn't support OpenMP. To install the Homebrew version of gcc with OpenMP support you need to install it with
brew install gcc --without-multilib
or as pointed out by #Mark Setchell
brew reinstall gcc --without-multilib
This will install it to the /usr/local/bin directory. Homebrew will install it as gcc-<version> so as not to clobber the gcc bundled with XCode.
I finally did some research and I finally came across a solution here: <omp.h> library isn't found in the GCC version (4.2.1) in Mavericks.
I got a new gcc complier from http://hpc.sourceforge.net/
Then I placed a new executable folder by
$ sudo tar -xvf gcc-4.9-bin.tar -C /
Later I switched to it by
export PATH=/usr/local/bin:$PATH that seemed to do the trick!
I'm new to mac so please hang on with me. I have to compile a homemade package which compiles and runs in linux, and uses the boost libraries. First I was getting all kind of estrange errors from the compiler, until I realized that I was using gcc 4.2. I installed 4.8. I tried with clang but for some reason (which I do not understand) the version that got installed was 2.1:
$ clang --version
Apple clang version 2.1 (tags/Apple/clang-163.7.1) (based on LLVM 3.0svn)
Target: x86_64-apple-darwin13.3.0
Thread model: posix
I'm using OS X 10.9.4, Kernel Version: Darwin 13.3.0.
I installed boost using macports. When I tried to compile, the compiler couldn't find the headers so I did:
export DYLD_LIBRARY_PATH=/opt/local/include/
and the compiler found them. Now, when I run the makefile, I get:
In file included from /opt/local/lib/gcc48/gcc/x86_64-apple-darwin13/4.8.2/include/stdint.h:9:0,
from /opt/local/include/gcc48/c++/cstdint:41,
from /opt/local/include/gcc48/c++/bits/char_traits.h:376,
from /opt/local/include/gcc48/c++/ios:40,
from /opt/local/include/gcc48/c++/ostream:38,
from /opt/local/include/gcc48/c++/iostream:39,
from ../src/space/space.h:4,
from ../src/space/grid_space.cpp:1:
/opt/local/lib/gcc48/gcc/x86_64-apple-darwin13/4.8.2/include-fixed/stdint.h:27:32: fatal error: sys/_types/_int8_t.h: No such file or directory
#include <sys/_types/_int8_t.h>
^
compilation terminated.
and I cannot find where sys/_types/_int8_t.h is or how to install it if missing. I've read around to do xcode-select -install, but what I get is:
xcode-select -install
Usage: xcode-select -print-path
or: xcode-select -switch <xcode_folder_path>
or: xcode-select -version
Arguments:
-print-path Prints the path of the current Xcode folder
-switch <xcode_folder_path> Sets the path for the current Xcode folder
-version Prints xcode-select version information
while
xcodebuild -version
Xcode 5.1.1
Build version 5B1008
what's going on? where can I find sys/_types/_int8_t.h ?
I would like to use clang, but the version is too old and I need C++11 support. Clang is installed correctly, where it should be, and:
$ xcode-select -p
Usage: xcode-select -print-path
or: xcode-select -switch <xcode_folder_path>
or: xcode-select -version
Arguments:
-print-path Prints the path of the current Xcode folder
-switch <xcode_folder_path> Sets the path for the current Xcode folder
-version Prints xcode-select version information
I had to upgrade my gcc version to utilize the new C++11 standards. After following the instructions at http://ask.xmodulo.com/upgrade-gcc-centos.html . I started getting the error "/bin/sh: g++: command not found" when I try to build my project. How can I fix this? It looks like gcc installed fine by looking at the below output.
gcc --version
gcc (GCC) 4.7.2 20121015 (Red Hat 4.7.2-5)
G++ appears to be not installed. Find how to install gcc in your OS. After this, you have to make Eclipse find g++. I recommend to you, to install CDT plugins. They have many ready tools for C/C++ programming and it is fully compatible with gcc toolset.
I have Xcode 4.5.2 on Moutain Lion, and I have install the lastest "Command Line Tools" but when I tried to compile with g++ or clang++ (and the options -std=c++11 -stdlib=libc++) I get an error.
With g++:
cc1plus: error: unrecognized command line option "-std=c++11"
cc1plus: error: unrecognized command line option "-stdlib=libc++"
With clang++:
clang: error: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or later)
It's in a Qt project.
So how can I used the C++11 on my Mac ?
As you found, g++ does not support those command line options.
It sounds like you're using Xcode.
For clang, you should look at the project settings, and make sure that the "Deployment Target" is set to 10.7 (or 10.8)
What the error message is telling you is that libc++ is not available for 10.6 and before.
I installed gcc-4.7 on my Mac to make C++11 work. GCC in its current version is fairly good at supporting C++11, so this should be a fair choice.
The installation can be done by Homebrew and is not that complicated (at least I was able to do it...)
To install Homebrew if you do not already have it:
ruby -e "$(curl -fsSkL raw.github.com/mxcl/homebrew/go)"
Now run
brew doctor
and fix whatever problems come up (there is something written in the hombrew documentation for that). Finally, install current gcc:
brew install gcc
If everything goes well you should be able to access g++-4.7, which allows -std=c++0x.
Try -std=c++0x if c++11 doesn't work. Support for the -std=c++11 option is relatively new in GCC and you might not have a recent enough version.
I'd trust Marshall on the libc++ issue.