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How to get the path where the library is installed


How to get the path where the library is installed

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How to get the path where the library is installed
Tag : development , By : platformNomad
Date : December 05 2020, 12:23 PM

it should still fix some issue I am working in Linux and I have a library written in Fortran 90 (written by 3rd party), that is reading from a file in the current working directory. I would like to be able to call the resulting library from other folders, hence I need to read the path where the library is installed. How can I know the path to the compiled library within the Fortran code? , If you wish you can fix the path at compile time. Something like
gfortran -cpp mylib.f90 -DPREFIX=\"/usr/local/\"

open(newunit=u,file=PREFIX//'mylib/initialise.dat')
CALL get_environment_variable("MYLIB_PATH", mylib_path, status=stat)
mkdir $HOME/.config/mylib/
echo "/usr/local/mylib" > $HOME/.config/mylib/path
if (stat/=0) then
  CALL get_environment_variable("HOME", home_dir)
  open(newunit=path_unit, file=home_dir//'/.config/mylib/path',status='old',action='read',iostat=stat)
  if (stat/=0) complain

  read(path_unit,'(a)',iostat=stat)  mylib_path
  if (stat/=0) complain
end if

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How to check if openssl or cryptopp is installed and use the library that actually exists in the system (is installed)?


Tag : c , By : Scott Everts
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , It's not quite that simple. In order to find that a macro is defined, you have to include the header that defines that macro. And C doesn't have anything like "include foo.h iff it exists"; it has to exist otherwise there is a compilation error.
Normally this would be sorted out by a script that you run before compilation. Your script checks locations like /usr/include, /usr/local/include, etc., to see if the OpenSSL headers are there; and then it outputs a Makefile which contains in the CFLAGS -DHAVE_OPENSSL. Then your code can check for that macro.

installed gcc include path doesn't seem correct and library and header mismatch reported


Tag : c , By : zac
Date : March 29 2020, 07:55 AM
should help you out To compile a kernel module, you are supposed to write a Makefile to setup the kernel path and other environment variable.
You can use the below Makefile to build you kernel module
obj-m := hello_world.o

all:
    make -C /lib/modules/$(shell uname -r)/build  M=$(PWD) modules

clean: 
    make -C /lib/modules/$(shell uname -r)/build  M=$(PWD) clean

How can I change the library path of an executable after it has been built/installed?


Tag : cmake , By : orlandoferrer
Date : March 29 2020, 07:55 AM
around this issue For find a library at runtime, ldd uses (among other things) RPATH directories, embedded into the executable.
By default, when build the executable/library, CMake adds to RPATH directories, where linked libraries are located.
set(CMAKE_SKIP_RPATH TRUE)

how to set path for pandas library in /apps for Python installed in /opt in linux redhat


Tag : python , By : Johannes
Date : March 29 2020, 07:55 AM
wish help you to fix your issue First of all, the Python 2.x version won't be active for long. So build your system in Python 3.x versions.
You need to extract the .tar.gz file and then install. You can use tar -xzf .tar.gz
yum install python3-pandas

How to install npm for node.js installed with homebrew installed at custom path?


Tag : macos , By : user130518
Date : March 29 2020, 07:55 AM
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