I followed the instructions at https://sites.google.com/site/dwhipp/tutorials/mac_compilers for OSX Lion and XCode 4.3 to use g++ on the command line, but when I run it I get this:
jeff~/Dropbox/cpp$ g++ hello.cpp
ld: unknown option: -no_compact_unwind
collect2: error: ld returned 1 exit status
If you want to use the latest version of GCC (4.7) by command line on Mac OS X Lion, I have a better solution.
Install MacPorts (you can download the source code and compile it or download the pkg installer):
http://www.macports.org/install.php
Installed MacPort, open the Terminal and type (you need the root password)
sudo port selfupdate
for updating the port tree. Then type
sudo port install gcc47 +universal
This command will install the GCC 4.7 compiler on your Mac (this compilation will take a lot of time, be patient). Now you have your GCC 4.7 compiler accessible by the command line under the name
gcc-mp-4.7
(use g++-mp-4.7for C++ compilation). You have also the new C++11 standard adding the option
g++-mp-4.7 -std=c++11
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 would like to install boost with specified compilers, such as the gcc-4.9.1 that I have installed in <gcc_49_root>. The current OS is Mac OS X 10.9.4, but I would like this installation process to work on other OS. The documentation of boost is quite opaque about this scenario. What I have tried is as following:
$ ./bootstrap.sh
-n Building Boost.Build engine with toolset darwin...
tools/build/src/engine/bin.macosxx86_64/b2
-n Detecting Python version...
2.7
-n Detecting Python root...
/System/Library/Frameworks/Python.framework/Versions/2.7
-n Unicode/ICU support for Boost.Regex?...
not found.
Generating Boost.Build configuration in project-config.jam...
Insert using gcc : 4.9.1 : <gcc_49_root>/bin/g++-4.9 : ; into project-config.jam.
$ ./b2 --prefix=<...> toolset=gcc-4.9.1 install
But encountered the errors:
Jamfile</Users/dongli/Shares/works/packman/test/packages/Boost/boost_1_56_0/libs/context/build>.gas64 bin.v2/libs/context/build/gcc-4.9.1/release/address-model-64/architecture-x86/threading-multi/asm/make_x86_64_sysv_macho_gas.o
FATAL:/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/x86_64/as: I don't understand '-' flag!
clang: error: no input files
cpp -x assembler-with-cpp "libs/context/src/asm/make_x86_64_sysv_macho_gas.S" | as --64 -o "bin.v2/libs/context/build/gcc-4.9.1/release/address-model-64/architecture-x86/threading-multi/asm/make_x86_64_sysv_macho_gas.o"
...failed Jamfile</Users/dongli/Shares/works/packman/test/packages/Boost/boost_1_56_0/libs/context/build>.gas64 bin.v2/libs/context/build/gcc-4.9.1/release/address-model-64/architecture-x86/threading-multi/asm/make_x86_64_sysv_macho_gas.o...
gcc.link.dll bin.v2/libs/atomic/build/gcc-4.9.1/release/threading-multi/libboost_atomic.dylib
ld: unknown option: -h
collect2: error: ld returned 1 exit status
"/usr/local/opt/gcc/bin/g++-4.9" -o "bin.v2/libs/atomic/build/gcc-4.9.1/release/threading-multi/libboost_atomic.dylib" -Wl,-h -Wl,libboost_atomic.dylib -shared -Wl,--start-group "bin.v2/libs/atomic/build/gcc-4.9.1/release/threading-multi/lockpool.o" -Wl,-Bstatic -Wl,-Bdynamic -Wl,--end-group
...failed gcc.link.dll bin.v2/libs/atomic/build/gcc-4.9.1/release/threading-multi/libboost_atomic.dylib...
What should I do with these errors? Thanks in advance!
Apple's linker ld(ld64) is different from other UNIX/GNU linkers and does not support some options, such as -h(soname), --start-group, --end-group, etc,. Those errors you got("unknown option") were the results of trying to pass non-supported flags to Apple's ld when you specify the gcc toolset.
The way I hacked mine was to first include "darwin" in the project config file:
using gcc : 4.9.1 : <gcc_49_root>/bin/g++-4.9 : <linker-type>darwin ;
Next removing the non-supported flags from {BOOST_DIR}/tools/build/src/tools/gcc.jam, from the long command in the "actions link.dll bind LIBRARIES" block:
remove/comment out this portion:
... $(HAVE_SONAME)-Wl,$(SONAME_OPTION)$(SPACE)-Wl,$(<[-1]:D=) ...
Afterwards the Boost libraries built without errors and worked fine in other gcc4.9 compiled codes.
$ ./bootstrap.sh --with-toolset=gcc
$ ./b2 --toolset=gcc-4.9.1
UPDATE (May 2015): I recently did a new built of gcc 5.1.0 and Boost 1.58.0 on Yosemite (10.10.1). Same fix worked for me.
I am using Mac Yosemite and this worked for me.
Open "tools/build/example/user-config.jam" and change
# Configure gcc (default version).
# using gcc ;
# Configure specific gcc version, giving alternative name to use.
using darwin : 5 : g++-5 ;
Then open "tools/build/src/tools/darwin.jam" then delete below line (this step may not be required. just try both way);
"$(CONFIG_COMMAND)" -dynamiclib -Wl,-single_module -install_name "$(<:B)$(<:S)" -L"$(LINKPATH)" -o "$(<)" "$(>)" "$(LIBRARIES)" -l$(FINDLIBS-SA) -l$(FINDLIBS-ST) $(FRAMEWORK_PATH) -framework$(_)$(FRAMEWORK:D=:S=) $(OPTIONS) $(USER_OPTIONS)
As last step, compile and install
$ ./bootstrap.sh --with-libraries=all --with-toolset=darwin --prefix=/usr/local/boost_for_gcc
$ ./b2
$ ./b2 install
Now you can compile your code like below
$ g++ -o main main.cpp -L/usr/local/boost_for_gcc/lib -I/usr/local/boost_for_gcc/include -lboost_regex
Reference:
http://qiita.com/misho/items/0c0b3ca25bb8f62aa681
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.
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