I'm building portaudio under Windows 10, and I don't know how to link the libportaudio.la file under my portaudio build directory.
I used MSYS with MinGW to build portaudio, following this: http://portaudio.com/docs/v19-doxydocs/compile_windows_mingw.html
(But I didn't make install)
My build command in cmd is:
g++ test.cpp -I"portaudio_dir/include" -L"portaudio_dir/lib" -lportaudio
and it fails with cannot find lportaudio
The file libportaudio.la that you assume to be the PortAudio library you
have just built is not a library.
$ file libportaudio.la
libportaudio.la: libtool library file, ASCII text
It is a text file of key-value pairs that that libtool generates to facilitate platform-independent
linkage of the actual library in GNU autotools
projects, such PortAudio itself. You can open it in your text editor and read it.
The real (static and dynamic) PortAudio libraries that you built with:
./configure
make
are located in a hidden subdirectory:
portaudio/lib/.libs
which is usual for libraries built with autotools. It is expected that after
make you will run make install (as root), which will copy the libraries
and their associated header files to the default installation directories, or
the alternative ones that you specified with:
./configure PREFIX=<prefix_dir>
As you say, you didn't run make install. If you want to link a program against libportaudio
while the static and dynamic libraries remain only in the build directory, you need:
$ g++ test.cpp -I"portaudio_dir/include" -L"portaudio_dir/lib/.libs" -lportaudio
But remember that even if you successfully link a program like this against the dynamic
library portaudio_?.dll, that program will fail to load the DLL at runtime
unless the OS loader can find the DLL by its standard DLL search algorithm
The easiest - but not necessarily best - way to ensure the DLL is found at runtime is to copy it into the same directory as your program.