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c++cmakeconan

Even though it is in conancenter, it gives an error

I'm trying to make a very simple example using Conan. Here are my steps:

Directory Structure

.
├── build
├── CMakeLists.txt
├── conanfile.txt
└── main.cpp

main.cpp

#include <iostream>
#include <curl/curl.h>

int main(int argc, char** argv) {
    std::cout << "Hello World" << std::endl;

    return 0;
}

conanfile.txt

[requires]
libcurl/7.77.0

[generators]
CMakeDeps
CMakeToolchain

CMakeLists.txt

cmake_minimum_required(VERSION 3.10)
project(Conan2 CXX)

find_package(CURL CONFIG REQUIRED)

add_executable(App main.cpp)
target_link_libraries(App CURL::libcurl)


$ cd build
$ conan install ..

======== Input profiles ========
Profile host:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.cppstd=gnu14
compiler.libcxx=libstdc++11
compiler.version=9
os=Linux

Profile build:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.cppstd=gnu14
compiler.libcxx=libstdc++11
compiler.version=9
os=Linux


======== Computing dependency graph ========
Graph root
    conanfile.txt: /home/qwe/NoteX/Conan/2/conanfile.txt
Requirements
    libcurl/7.77.0#fa792ade05b92058672e6fc91d442ffb - Cache
    openssl/3.1.3#fff5e82eb893e0c6ab135df0e60b894f - Cache
    zlib/1.2.13#97d5730b529b4224045fe7090592d4c1 - Cache
Build requirements
    autoconf/2.71#53be95d228b2dcb30dc199cb84262d8f - Cache
    automake/1.16.5#058bda3e21c36c9aa8425daf3c1faf50 - Cache
    gnu-config/cci.20210814#15c3bf7dfdb743977b84d0321534ad90 - Cache
    libtool/2.4.7#d55a3c2435c19e830fa77aa5c6c19350 - Cache
    m4/1.4.19#adbdd7fb7db33e609425c797196baccb - Cache
    meson/1.2.2#aace9dcc1db58fa42ecb5292f724092d - Cache
    ninja/1.11.1#77587f8c8318662ac8e5a7867eb4be21 - Cache
    pkgconf/1.9.3#3e658ebc066dc868a1f8a472c1065368 - Cache
Resolved version ranges
    openssl/[>=1.1 <4]: openssl/3.1.3

======== Computing necessary packages ========
Requirements
    libcurl/7.77.0#fa792ade05b92058672e6fc91d442ffb:a66c168cd0b825324f775fad7b3886c2d22225c3 - Missing
    openssl/3.1.3#fff5e82eb893e0c6ab135df0e60b894f:2b010f4baf8e367a9e2df7f714b35852aa8fa5aa - Missing
    zlib/1.2.13#97d5730b529b4224045fe7090592d4c1:72c852c5f0ae27ca0b1741e5fd7c8b8be91a590a - Missing
Build requirements
Skipped binaries
    autoconf/2.71, automake/1.16.5, gnu-config/cci.20210814, libtool/2.4.7, m4/1.4.19, meson/1.2.2, ninja/1.11.1, pkgconf/1.9.3

======== Installing packages ========
ERROR: Missing binary: libcurl/7.77.0:a66c168cd0b825324f775fad7b3886c2d22225c3
ERROR: Missing binary: openssl/3.1.3:2b010f4baf8e367a9e2df7f714b35852aa8fa5aa
ERROR: Missing binary: zlib/1.2.13:72c852c5f0ae27ca0b1741e5fd7c8b8be91a590a

zlib/1.2.13: WARN: Can't find a 'zlib/1.2.13' package binary '72c852c5f0ae27ca0b1741e5fd7c8b8be91a590a' for the configuration:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.version=9
os=Linux
[options]
fPIC=True
shared=False

ERROR: Missing prebuilt package for 'libcurl/7.77.0', 'openssl/3.1.3', 'zlib/1.2.13'
Check the available packages using 'conan list zlib/1.2.13:* -r=remote'
or try to build locally from sources using the '--build=libcurl/7.77.0 --build=openssl/3.1.3 --build=zlib/1.2.13' argument

More Info at 'https://docs.conan.io/2/knowledge/faq.html#error-missing-prebuilt-package'

Lets check Are there really these packages in ConanCenter or not?

$ conan search zlib/1.2.13 -r=conancenter
conancenter
  zlib
    zlib/1.2.13
$ conan search openssl/3.1.3 -r=conancenter
conancenter
  openssl
    openssl/3.1.3

As you can see with the search command above, it gives the error below even though it is in conancenter.

ERROR: Missing prebuilt package for 'libcurl/7.77.0', 'openssl/3.1.3', 'zlib/1.2.13' Check the available packages using 'conan list zlib/1.2.13:* -r=remote' or try to build locally from sources using the '--build=libcurl/7.77.0 --build=openssl/3.1.3 --build=zlib/1.2.13' argument

More Info at 'https://docs.conan.io/2/knowledge/faq.html#error-missing-prebuilt-package'

First Edit

When i build manually, it gives another error.

$ conan install .. --build=libcurl/7.77.0 --build=openssl/3.1.3 --
build=zlib/1.2.13


======== Installing packages ========
ERROR: Missing binary: libtool/2.4.7:72c852c5f0ae27ca0b1741e5fd7c8b8be91a590a

libtool/2.4.7: WARN: Can't find a 'libtool/2.4.7' package binary '72c852c5f0ae27ca0b1741e5fd7c8b8be91a590a' for the configuration:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.version=9
os=Linux
[options]
fPIC=True
shared=False

ERROR: Missing prebuilt package for 'libtool/2.4.7'
Check the available packages using 'conan list libtool/2.4.7:* -r=remote'
or try to build locally from sources using the '--build=libtool/2.4.7' argument

More Info at 'https://docs.conan.io/2/knowledge/faq.html#error-missing-prebuilt-package'

Second edit

After build manually it compiles fine. After compiling what i done:

$ cmake .. -G "Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=conan_toolchain.cmake -DCMAKE_POLICY_DEFAULT_CMP0091=NEW -DCMAKE_BUILD_TYPE=Release
$ cmake --build . --config Release

After above commands I was able to create the executable file successfully.

Solution

  • The Conan install command is showing your dependencies graph:

    ======== Computing dependency graph ========
Graph root
    conanfile.txt: /home/qwe/NoteX/Conan/2/conanfile.txt
Requirements
    libcurl/7.77.0#fa792ade05b92058672e6fc91d442ffb - Cache
    openssl/3.1.3#fff5e82eb893e0c6ab135df0e60b894f - Cache
    zlib/1.2.13#97d5730b529b4224045fe7090592d4c1 - Cache

    And it says that you have those packages recipes cached already.

    So, Conan will try to find a binary package with a package ID that matches your current profile

    By default, Conan will use your cache to find that package, but as it does not exist in your machine, it will result on missing dependencies error. But you still can tell to Conan to use a remote as priority, instead of your cache, to look for that missing binary package. To do that, you need to pass --remote=<remote_name>:

    conan install --requires=zlib/1.3 -r conancenter
# or
conan install conanfile.txt -r conancenter

    Here I told to Conan: Try to install zlib/1.3 from conancenter first. Or, try to install anything listed in conanfile.txt from the conancenter first.

    It should solve your case, because Conan Center does support GCC9, as listed in the supported configurations

    About your second situation:

    When i build manually, it gives another error.

$ conan install .. --build=libcurl/7.77.0 --build=openssl/3.1.3 --
build=zlib/1.2.13


======== Installing packages ========
ERROR: Missing binary: libtool/2.4.7:72c852c5f0ae27ca0b1741e5fd7c8b8be91a590a

    Conan uses a dependencies graph to decide its build order, but when you said to build those packages, the libtool is also listed in the graph and is missing too. To check the build order executed to build a package, you can run graph build-order command:

    conan graph build-order --requires=libcurl/7.77.0

    However, it could be boring solving all this, as you actually just want to install a package. So, to solve it automatically, you can pass --build=missing. The missing is a special word, that tells Conan to build what is missing in the graph only. But in case you want to build everything from source, you actually can pass --build=*:

    conan install conanfile.txt --build=missing --remote=conancenter

    This command should solve your problem. It will install from Conan Center first, then what it does not find available, Conan will build from sources automatically.