My gcc compiler is at a custom location /my/path/hpgcc
I've downloaded the boost sources. Executed bootstrap.sh, but it fails because it runs with the default gcc.
Looking into it, I see that it fails at the first thing it does: building the Boost.Build engine:
gcc -o bootstrap/jam0 command.c compile.c debug.c expand.c glob.c hash.c hdrmacro.c headers.c jam.c jambase.c jamgram.c lists.c make.c make1.c newstr.c option.c output.c parse.c pathunix.c pathvms.c regexp.c rules.c scan.c search.c subst.c timestamp.c variable.c modules.c strings.c filesys.c builtins.c pwd.c class.c native.c md5.c w32_getreg.c modules/set.c modules/path.c modules/regex.c modules/property-set.c modules/sequence.c modules/order.c execunix.c fileunix.c
(fails because executed with the default gcc, and not my gcc version).
I've tried to change the gcc path in the user-config.jam file, but it doesn't help. Probably because the Boost.Build's build script boost_1_47_0/tools/build/v2/engine/build.sh doesn't use user-config.jam, and just uses the default locations.
Any solution?
Add the line:
using gcc : : /my/path/hpgcc ;
to user-config.jam. user-config.jam will usually be in /path/to/boost/tools/build/v2/, but you can put a custom user-config.jam or site-config.jam in any of the places listed here.
/my/path/hpgcc should be the full path to the g++ executable.
EDIT (Igor Oks) : What eventually solved the problem is that I edited boost_1_47_0/tools/build/v2/engine/build.sh to make it use my custom gcc.
We do this in our build environment by simply defining the PATH and LD_LIBRARY_PATH environment variables to pickup our desired GCC first.
Related
Hi team,
I have three files which I need to compile for testing, btw im using CentOS linux.
source_code.c
library.h
library.c
how do I put the library.h in the gcc library, so I can use it?
how do I compile the source_code.c to use that library?
Thank you very much.
This is basic knowledge of your tools, but you can do this:
#include "library.h" in the include section of the library.c code (at top of the file).
gcc source_code.c library.c in the linux terminal will link and compile both source_code.c and library.c. This will generate an executable named "a.out" (if there were no compilation problems). You can change its name, by adding the option -o name to the gcc command (gcc source_code.c library.c -o mycode will generate an executable named "mycode").
If you really need a library that will be used by a lot of other programs, you can look for "shared libraries", but I think that you are asking for a basic thing.
You dont need this library.h while building and executable (with gcc) as you should have specified the exact location of the library in the source file. All you need to do is gcc sourcefile1.c sourcefile2.c -o exename
The problem I faced has been solved here:
Loading shared library in open-mpi/ mpi-run
I know not how, setting LD_LIBRARY_PATH or specifying -x LD_LIBRARY_PATH fixes the problem, when my installation itself specifies the necessary -L arguments. My installation is in ~/mpi/
I have also included my compile-link configs.
$ mpic++ -showme:version
mpic++: Open MPI 1.6.3 (Language: C++)
$ mpic++ -showme
g++ -I/home/vigneshwaren/mpi/include -pthread -L/home/vigneshwaren/mpi/lib
-lmpi_cxx -lmpi -ldl -lm -Wl,--export-dynamic -lrt -lnsl -lutil -lm -ldl
$ mpic++ -showme:libdirs
/home/vigneshwaren/mpi/lib
$ mpic++ -showme:libs
mpi_cxx mpi dl m rt nsl util m dl % Notice mpi_cxx here %
When I compiled with mpic++ <file> and ran with mpirun a.out I got a (shared library) linker error
error while loading shared libraries: libmpi_cxx.so.1:
cannot open shared object file: No such file or directory
The error has been fixed by setting LD_LIBRARY_PATH. The question is how and why? What am i missing? Why is LD_LIBRARY_PATH required when my installation looks just fine.
libdl, libm, librt, libnsl and libutil are all essential system-wide libraries and they come as part of the very basic OS installation. libmpi and libmpi_cxx are part of the Open MPI installation and in your case are located in a non-standard location that must be explicitly included in the linker search path LD_LIBRARY_PATH.
It is possible to modify the configuration of the Open MPI compiler wrappers and make them pass the -rpath option to the linker. -rpath takes a library path and appends its to a list, stored inside the executable file, which tells the runtime link editor (a.k.a. the dynamic linker) where to search for libraries before it consults the LD_LIBRARY_PATH variable. For example, in your case the following option would suffice:
-Wl,-rpath,/home/vigneshwaren/mpi/lib
This would embed the path to the Open MPI libraries inside the executable and it would not matter if that path is part of LD_LIBRARY_PATH at run time or not.
To make the corresponding wrapper add that option to the list of compiler flags, you would have to modify the mpiXX-wrapper-data.txt file (where XX is cc, c++, CC, f90, etc.), located in mpi/share/openmpi/. For example, to make mpicc pass the option, you would have to modify /home/vigneshwaren/mpi/share/openmpi/mpicc-wrapper-data.txt and add the following to the line that starts with linker_flags=:
linker_flags= ... -Wl,-rpath,${prefix}/lib
${prefix} is automatically expanded by the wrapper to the current Open MPI installation path.
In my case, I just simply appends
export LD_LIBRARY_PATH=/PATH_TO_openmpi-version/lib:$LD_LIBRARY_PATH
For example
export LD_LIBRARY_PATH=/usr/local/openmpi-1.8.1/lib:$LD_LIBRARY_PATH
into $HOME/.bashrc file and then source it to active again source $HOME/.bashrc.
I installed mpich 3.2 using the following command on Ubuntu.
sudo apt-get install mpich
When I tried to run the mpi process using mpiexec, I got the same error.
/home/node1/examples/.libs/lt-cpi: error while loading shared libraries: libmpi.so.0: cannot open shared object file: No such file or directory
Configuring LD_LIBRARY_PATH didn't fix my problem.
I did a search for the file 'libmpi.so.0' on my machine but couldn't find it. Took me some time to figure out that 'libmpi.so.0' file is named as 'libmpi.so' on my machine. So I renamed it to 'libmpi.so.0'.
It solved my problem!
If you are having the same problem and you installed the library through apt-get, then do the following.
The file 'libmpi.so' should be in the location '/usr/lib/'. Rename the file to 'libmpi.so.0'
mv /usr/lib/libmpi.so /usr/lib/libmpi.so.0
After that MPI jobs should run without any problem.
If 'libmpi.so' is not found in '/usr/lib', you can get its location using the following command.
whereis libmpi.so
first, run this command
$ sudo apt-get install libcr-dev
if still have this problem then configure LD_LIBRARY_PATH like this:
export LD_LIBRARY_PATH=/usr/local/mpich-3.2.1/lib:$LD_LIBRARY_PATH
then add it to ~/.bashrc before this line:
[ -z "$PS1" ] && return
Simply running
$ ldconfig
appears to me as a better way to solve the problem (taken from a comment on this question). In particular, since it avoids misuse of the LD_LIBRARY_PATH environment variable. See here and here, for why I believe it's misused to solve the problem at hand.
I am trying to compile the Boost 1.48 in CentOS 5.6. I need the files to be in this format:
boost_program_options-gcc41-mt-1_48
I am compiling with this bjam flags:
./b2 -q --toolset=gcc --layout=tagged --without-mpi install
but it still don't add the gcc prefix to the name.
How can I fix this?
For me (although I use darwin toolset instead of plain gcc) Bjam creates files with names, like:
libboost_program_options-xgcc42-mt-1_49.a
Create the site-config.jam or user-config.jam file, which defines your custom version of GCC toolset, as described in 'Configuration' section of the Boost.Build documentation.
Additionally, there is an example, which suggests, that standard GCC toolset has version names defined as numbers only, without the gcc prefix.
Boost output filenames are generated, by the tag rule in boostcpp.jam. You can check there, if the above solution would be insufficient
This question may sound a little absurd. Facts:
I have a program written in C++.
It uses lot of in-house libs.
I don't have read permission to the libs.
So I have to build with a given tool which does have access to the lib headers and archives.
Stuck on gcc 4.3
I have a local build of gcc 4.5
I want g++ to use my local g++ instead of the old version.
Is there any way to get this done?
Use the full path of the compiler instead of invoking it without specifying the path.
Many configure scripts accept the CC environment variable:
export CC=/usr/bin/gcc44 for example. If you have a configure script, try ./configure --help to see if it's supported.
Assuming you have g++ in your ~/bin folder, could you add
export PATH=~/bin:$PATH
to your shell's .profile file (.bash_profile for bash). Then when you log in again and do which g++ it should show your local version of g++.
I am attempting to install an application. During compilation it fails with the following error:
/usr/bin/ld: cannot find -lemu
I have installed the libemu library, and it now currently resides in /opt/libemu/. However, when I try and compile my application the library is not found. Is there any way to correct this?
EDIT: It also looks like the make is resulting in:
It also looks like the make file is compiling with the following:
gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions
build/temp.linux-x86_64-2.6/libemu_module.o
-L/opt/libemu/lib -lemu -o build/lib.linux-x86_64-2.6/libemu.so
I have tried setting my LD_LIBRARY_PATH to /opt/libemu, still doesn't work - fails with the error mentioned above.
You need to tell the linker where it is:
gcc stuff -L/opt/libemu -lemu
or:
gcc stuff /opt/libemu/libemu.a
where stuff is your normal compile/link options files etc.
You can also specify library paths in the LIBRARY_PATH environment variable:
LIBRARY_PATH=/opt/libemu
export LIBRARY_PATH
before you run your build. Yet another option is to see where gcc looks for libraries by running:
gcc --print-search-dirs
and put your library in one of the listed directories.
Edit: It is really not clear from your latest info what you are trying to build. Are you trying to turn a static library into a shared library? Most important - What is the exact filename of the library file you have copied into the /opt/libemu directory?
The environment variable LD_LIBRARY_PATH should include (but probably does not by default) /opt/libemu.
try running:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/libemu
make install