I have two gcc versions installed on my linux host, one is 4.8.1, another is 4.4.7. I want to use 4.8.1 while compile my code.
After i set distcc, gcc -v will print the collect 4.8.1, but distcc -v will still print 4.4.7.
So when i use pump make -j4 CC=distcc CXX=distcc to compile my project, it will pop below error:
cc1plus: error: unrecognized command line option "-std=c++11"
It seems that distcc don't use the correct compiler. How can i specified the compiler for distcc?
Still didn't find the easy way, but can compile like below:
GCC_HOME=/path/of/gcc make -j4
CC="LD_LIBRARY_PATH=$GCC_HOME/mpfr-3.1.2/lib:$GCC_HOME/mpc-1.0.1/lib:$GCC_HOME/gmp-5.1.2/lib:$GCC_HOME/lib:$GCC_HOME/lib64
distcc $GCC_HOME/bin/gcc"
CXX="LD_LIBRARY_PATH=$GCC_HOME/mpfr-3.1.2/lib:$GCC_HOME/mpc-1.0.1/lib:$GCC_HOME/gmp-5.1.2/lib:$GCC_HOME/lib:$GCC_HOME/lib64
distcc $GCC_HOME/bin/g++"
But in my invironment, distcc still can't work for pump mode
Related
I working on trying to compile a code written in C++ and Root on my Mac. The code is from a colleague who works on a Linux laptop. In addition to the different OS's, I have both a different version of gcc and Root than her and I am not sure which difference is causing the code not to compile on my machine.
She has g++ 4.8 and root 5.(something). I have gcc 5.3.0 and root 6.06/02.
She has given to me the a line of code she uses to get her machine to compile the code
gcc -Wall -o executable_name code_name.cc `root-config --cflags --glibs`
But when I write on my machine, Terminal gives me the error
gcc: error: unrecognized command line option ‘-stdlib=libc++’
gcc: error: unrecognized command line option ‘-stdlib=libc++’
I need help generating the correct line to get gcc to compile the code.
The problem here is two-fold: You're on OSX and you are using GCC.
The problem with this is that root-config assumes that since you're on OSX you will be using the OSX-standard Clang compiler which have the -stdlib flag. Since you're not using Clang, but GCC (which doesn't have this flag) you get an error.
You have two possible solutions: Use clang++ instead of g++ to compile and build (requires you to install the compiler if it's not installed already, it comes with Xcode), or to modify the root-config script so it doesn't add -stdlib=libc++. There might be environment variables or flags that the root-config script checks that alter the behavior, but I don't know anything about the script, you have to check it for that.
I'm trying to get the gfortran compiler with cygwin. When attempting to compile a hello world program, I get the following error:
gfortran: fatal error: -fuse-linker-plugin, but cyglto_plugin.dll not found
compilation terminated.
To install the compiler, I used the cygwin setup and selected
gcc-fortran: GNU compiler collection
libgfortran3: GCC fortran runtime library
I also mistakenly selected the toolchains for mingw, even though I don't have the mingw compiler (as far as I'm aware). g++, which I installed awhile ago, works fine.
What do I need to do to compile/find the library?
It is because of the gcc and gfortran versions are not same, try checking that. If so, do the following
$ apt-cyg remove gcc-fortran
$ apt-cyg install gcc-fortran
I have two versions of gcc/g++ installed: gcc-4.5(installed from package manager, binary files are under /usr/bin, header files are under /usr/include) and gcc-4.4.3(compiled by myself, put under /opt/gcc-4.4.3).
When I made gcc/g++ 4.4.3 to be the default version (using "update-alternatives" to make /usr/bin/gcc and /usr/bin/g++ point to the corresponding one under directory "/opt/gcc-4.4.3/bin") and compiled the files, it always reported the following errors:
/usr/include/c++/4.5/bits/basic_string.h:1659: undefined reference to
`std::basic_string,
std::allocator::_S_construct_aux_2(unsigned long, char,
std::allocator const&)'
It seems that the compiler is trying to find the header files for c++ under /usr/include/c++/4.5, which causes the link error. When I changed the default version of gcc to gcc-4.5, the errors disappeared.
So how could I make the compiler search for the header files under the correct directory "/opt/gcc-4.4.3/include"? I have tried to export CPLUS_INCLUDE_PATH, but it seems not work.
PS: gcc -v
Using build-in specs
Target: x86_64-suse-linux
Configured with: ./configure --prefix=/opt/gcc-4.4.3
Thread model: posix
gcc version 4.4.3 (GCC)
Try compiling gcc 4.4.3 again, but use the --with-gxx-include-dir=/opt/gcc-4.4.3/include option in the configure step.
It might be an issue with what update-alternatives has done, or not done.
When I build an alternate compiler I tend to use a --prefix and --program-suffix=-XY just so I can spot problems. Check which cpp is being run:
/opt/gcc-4.4.3/bin/g++ --print-prog-name=cpp
cpp -v </dev/null
/opt/gcc-4.4.3/bin/cpp -v < /dev/null
/opt/gcc-4.4.3/bin/g++ -print-search-dirs | grep '^programs:'
(you can also check ld and as with --print-prog-name)
Setting CPPFLAGS="-v -H" during a build may help track things down too.
An ugly workaround might be CPPFLAGS="-nostdinc -nostdinc++ -I/opt/gcc-4.4.3/include/" but it's better to fix your compile environment, as that's likely to cause as many problems as it solves. There are also options -isystem and -sysroot to help in certain cases, see http://gcc.gnu.org/onlinedocs/cpp/Invocation.html .
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 running Windows 7 with cygwin installed and trying to have a play around with some of the newer C++ features. I'm aware that in order to enable these features I have to pass g++ the -std=c++0x flag, however that gives me the following error:
cc1plus: error: unrecognized command line option "-std=c++0x"
The command line I'm issueing that gives rise to that error is:
g++-3 hello.cpp -std=c++0x -o hello
The reason for the g++-3 is because windows has trouble with the symbolic link. I've used g++ in the cygwin terminal and the result is the same anyway.
Any ideas?
You need to be using a version of GCC which supports C++ 2011 features.
This page has a list of compilers and which features each one supports. If I were you, I'd try to use GCC 4.7 if at all possible.