I wanted a old gcc version 2.7.2.3 with Redhat Linux 9.0 and gcc 2.95.3 and gcc-2.7.2.3.tar.gz, and used the following commands:
./configure --prefix=target-dir
make bootstrap LANGUAGES="c c++" BOOT_CFLAGS="-g -O2"
make install
after that, I can use the gcc-2.7.2.3 to compile c program , but the g++-2.7.2.3 did not work, when I compiled the following simplest c++ program:
//test.cc
int main() {return 0;}
using the command:
g++-2.7.2.3 test.cc
ld: cannot find -lg++
however, I can use the following commands to finish it:
g++-2.7.2.3 -c test.cc
gcc-2.7.2.3 -o test test.o
what should I do for modifying this error? any advice will be appreciated!
Maybe g++ library(lib) directory is missing.
Related
I have to use Anaconda provided compilers and their Boost package to compile my C++ code. I have a problem such that I do not know how to link properly during the compilation command.
To begin with: I create a dedicated anaconda env. with the following packages:
- boost-cpp=1.77.0
- compilers=1.3.0
These packages may be found here:
https://anaconda.org/conda-forge/compilers
https://anaconda.org/conda-forge/boost-cpp
Upon env. activation: double check which compiler I use:
$ which g++
/usr/share/miniconda3/envs/MYNAME/bin/g++
And then I would like to compile, but I don't know how to include boost libraries.
When I run:
$ g++ workflow/src/CODE.cpp -o workflow/bin/CODE -lm
Of course I get:
CODE.h:10:10: fatal error: boost/property_tree/info_parser.hpp: No such file or directory
10 | #include <boost/property_tree/info_parser.hpp>
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Nevermind, I have worked it out.
Although it might be useful for others so let's keep the solution in here:
g++ workflow/src/CODE.cpp -o workflow/bin/CODE -I$HOME/miniconda3/envs/MYNAME/include -lm
I am trying to install Armadillo with Homebrew with
brew install armadillo
but when I try to compile with
g++ example.cpp -o example -std=c++11 -O2 -larmadillo
it gives the following error:
fatal error: 'armadillo' file not found
How can I solve this problem?
I'm guessing here that you have a new M1 Mac. The issue in this case is that ARM-native homebrew is installed to /opt/homebrew/ by default, meaning armadillo was installed to /opt/homebrew/include/ which is not in your search path.
To see if this is the case, try providing the paths as follows:
CPATH=/opt/homebrew/include LIBRARY_PATH=/opt/homebrew/lib g++ example.cpp -o example -std=c++11 -O2 -larmadillo
To avoid the issue in general, I'm running with those CPATH and LIBRARY_PATH variables exported in my ~/.zprofile file (using zsh). I found this answer on the apple stack exchange helpful.
I have 2 cpp files(with one main function) in /home/misha/proga/c++again folder. I built C/C++: g++ build active task and modified it to compile all files in the folder above. Now, I need to add one more task to call a binary. I think I should add one more entry in "tasks" to finally be able to run a code. Where can I read about how to write this second task? I am new to programming. Is my approach correct to run this code contained in two files? I also do not know where this binary lies. Is it tasks file in .vscode folder ?
I use Ubuntu 19.10 and VSC 1.46.1
In Terminal,
cd /home/misha/proga/c++again
Let's suppose your two cpp files are mainFile.cpp and file2.cpp
If g++ (so GCC) was not installed in your system, you can install it by running this command on the Terminal:
sudo apt-get install gcc g++
and, to compile the program (read about invoking GCC, you want warnings and debug information), write this command into the Terminal:
g++ -Wall -g mainFile.cpp file2.cpp -o yourprog
Then, you can run the program by typing:
./yourprog
It should work now. You could need to use the GDB debugger and GNU make (to be installed with sudo apt-get install gdb make)
Read also some C++ programming book and this C++ reference.
I do not understand your approach usualy your create a makefile and compile your cpp files
g++ -g -c -fpic -o name.o
at the end you link them
g++ name.o 2name.o and so on
If you create binarys you should store them in /usr/lib
and the name should libname.so you can acces them by using the -l argument
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!
I try to compile and use clang from svn trunk. I basically try to follow the directions here:
svn co -q http://llvm.org/svn/llvm-project/llvm/trunk llvm
svn co -q http://llvm.org/svn/llvm-project/cfe/trunk llvm/tools/clang
svn co -q http://llvm.org/svn/llvm-project/clang-tools-extra/trunk llvm/tools/clang/tools/extra
svn co -q http://llvm.org/svn/llvm-project/compiler-rt/trunk llvm/projects/compiler-rt
mkdir llvm_build_release
cd llvm_build_release
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$HOME/usr/local -DLLVM_TARGETS_TO_BUILD=host ../llvm
make -j12
make install
Above, I configure clang to be installed in the custom location ~/usr/local since I want to be able to play with it without changing my default environment.
I then create a simple test.cpp:
#include <iostream>
int main(int argc, const char* argv[]){
std::cout << "Hello world\n";
return 0;
}
and try to compile it:
~/usr/local/bin/clang++ test.cpp -o test
but get the error message:
test.cpp:1:10: fatal error: 'iostream' file not found
#include <iostream>
^
1 error generated.
(using the system version of clang, the same compilation works fine).
If I manually enter which standard library to use, it does work
~/usr/local/bin/clang++ -std=c++11 -stdlib=libstdc++ -I/usr/include/c++/4.2.1/ -L/usr/lib test.cpp -o test
The question is: How do I configure, compile and install clang from source so that I do not have to enter these standard library settings, but instead can just enter the ordinary ~/usr/local/bin/clang++ test.cpp -o test? I have macports installed, with its version of the standard libraries and the include files, if that helps.