Error while trying to add a shared library to meson build about meson HOT 8 OPEN

I think your issue is that you have specified that libcrypto.a is a source file to build your static library crypto. Is that what you really meant? It seems like it should be libcrypto.c or some such.

from meson.

I think your issue is that you have specified that libcrypto.a is a source file to build your static library crypto. Is that what you really meant? It seems like it should be libcrypto.c or some such.

I have already built the static library i just want to include it to meson.build

from meson.

static_library(...) is how you build a static library. See https://mesonbuild.com/Reference-manual_functions.html#static_library
You might want to have a look at https://mesonbuild.com/Dependencies.html

from meson.

This is not the idiomatic way to find a dependency. There is a libcrypto finder in Meson, you may be able to make this work by simply doing (untested):

project('myproject', 'c')

dep_crypto = dependency('libcrypto', static : true)

meson setup builddir -Dc_args="-I/path/to/crypto/includes" -Dc_link_args="-L/path/to/crypto/libs"

It doesn't look like liboqs provides any discovery methods at all? I don't see a pkg-config or a cmake-config, so that's going to be rather difficult to use from Meson.

The way to handle libraries like that if you can't use a pkg-config is something like:

cc = meson.get_compiler('c')
root_dir = get_option('openssl-root')  # or hardcode it if you don't care if it works on another machine
dep = declare_dependency(
    link_with : cc.find_library('crypto', dirs : root_dir, static : true),
    compile_args : f'-I@root_dir@/include',
)

from meson.

cc = meson.get_compiler('c')
root_dir = get_option('openssl-root')  # or hardcode it if you don't care if it works on another machine
dep = declare_dependency(
    link_with : cc.find_library('crypto', dirs : root_dir, static : true),
    compile_args : f'-I@root_dir@/include',
)

Trying the above methods i encountered few error such as -
meson.build:27:21: ERROR: Expecting rbracket got string.
compile_args : [f'-I{root_dir}/include/crypto'],

Library crypto found: YES

meson.build:25:0: ERROR: Entries in "link_with" may only be self-built targets,
external dependencies (including libraries) must go to "dependencies".

So i changed a little i have poste dit below

This is the structure i have saved the libraries
usr/local/openssl-root/
├── include/
│ ├── openssl/
│ │ ├── ssl.h
│ │ └── ...
└── lib/
├── libcrypto.a
├── libssl.a
└── ...

In my build file i have added these lines as you suggested

cc = meson.get_compiler('c')

openssl_root = get_option('openssl-root')  # or hardcode it if you don't care if it works on another machine
liboqs_root = get_option('liboqs-root')    # or hardcode it if you don't care if it works on another machine


crypto_dep = dependency('crypto', required : false)
ssl_dep = dependency('ssl', required : false)
oqs_dep = dependency('oqs', required : false)


if not crypto_dep.found()
    dep = declare_dependency(
        compile_args : ['-I' + join_paths(openssl_root, 'include', 'crypto')],
        link_with : crypto_dep,
    )
endif

if not ssl_dep.found()
    dep = declare_dependency(
        compile_args : ['-I' + join_paths(openssl_root, 'include', 'openssl')],
        link_with : ssl_dep,
    )
endif

if not oqs_dep.found()
    dep = declare_dependency(
        compile_args : ['-I' + join_paths(liboqs_root, 'include', 'oqs')],
        link_with : oqs_dep,
    )
endif

This is the error im getting when i do meson build :

Found pkg-config: /usr/bin/pkg-config (0.29.1)
Found CMake: /usr/bin/cmake (3.16.3)
Run-time dependency crypto found: NO (tried pkgconfig and cmake)
Run-time dependency ssl found: NO (tried pkgconfig and cmake)
Run-time dependency oqs found: NO (tried pkgconfig and cmake)

meson.build:35:4: ERROR: Entries in "link_with" may only be self-built targets,
external dependencies (including libraries) must go to "dependencies".

i have static libraries libssl.a, libcrypto.a and liboqs.a i also have the .h files of these libraries i have used the functions of ssl in my code so i want to add these libraries to the build and link

from meson.

meson.build:25:0: ERROR: Entries in "link_with" may only be self-built targets,

Oops, yes, that should be dependencies not link_with. I don't know what I was thinking when I wrote that.

I think this is what you want:

# [snip]

if not crypto_dep.found()
    dep = declare_dependency(
        compile_args : ['-I' + join_paths(openssl_root, 'include', 'crypto')],
        dependencies : cc.find_library('crypto', dirs : join_paths(openssl_root, 'lib')),
    )
endif

if not ssl_dep.found()
    dep = declare_dependency(
        compile_args : ['-I' + join_paths(openssl_root, 'include', 'openssl')],
        dependencies :  cc.find_library('ssl', dirs : join_paths(openssl_root, 'lib')),
    )
endif

if not oqs_dep.found()
    dep = declare_dependency(
        compile_args : ['-I' + join_paths(liboqs_root, 'include', 'oqs')],
        dependencies : cc.find_library('oqs', dirs : join_paths(liboqs_root, 'lib')),
    )
endif

from meson.

Hey, Thankyou for your help my meson setup _build is successful, but im still facing issue in ninja build , it says undefined reference to all the openssl functions i have used, i have added the libraries properly but still it says undefined reference and throws an error
After doing meson setup _build this is how it build
Run-time dependency crypto found: NO (tried pkgconfig and cmake)
Run-time dependency ssl found: NO (tried pkgconfig and cmake)
Run-time dependency oqs found: NO (tried pkgconfig and cmake)
Library crypto found: YES
Library ssl found: YES
Library oqs found: YES

But this is the error im getting when i do ninja -c build
[203/265] Linking target p11-kit/libp11-kit.so.0.3.1.
FAILED: p11-kit/libp11-kit.so.0.3.1
/usr/bin/ld: p11-kit/077403d@@p11-kit@sha/rpc-server.c.o: in function p11_kit_remote_serve_module': /home/eaas/Sivapriya/p11-kit/_build/../p11-kit/rpc-server.c:2514: undefined reference to OPENSSL_init_ssl'
/usr/bin/ld: /home/eaas/Sivapriya/p11-kit/_build/../p11-kit/rpc-server.c:2523: undefined reference to SSL_CTX_set_verify' /usr/bin/ld: /home/eaas/Sivapriya/p11-kit/_build/../p11-kit/rpc-server.c:2524: undefined reference to SSL_CTX_load_verify_locations'
/usr/bin/ld: /home/eaas/Sivapriya/p11-kit/_build/../p11-kit/rpc-server.c:2528: undefined reference to `SSL_new'

Im trying to add ssl functions to p11-kit, will you be able to help with this please

from meson.

What does the library or shared_library call for libp11-kit look like? I suspect you need to add dep_ssl to that target's dependency line

from meson.