Meet some problem when building project

[novumdxw]

Using the cmake cli to configure the project triggers a check for modules 'protobuf>=3.11;grpc++>=1.26'.
However, building the project causes another check modules 'protobuf;grpc++'.

It takes a lot of time. The dependece of Bear is also built from source.

How can I simplify the building process?

[novumdxw]

First, I use the following command to configure the project:

cmake -Bbuild -S. -G"Unix Makefiles" --install-prefix=$HOME/.local/tools/Bear -DCMAKE_BUILD_TYPE=Debug -DCMAKE_PREFIX_PATH="libfmt_dir;spdlog_dir;nlohmann_json_dir" -DENABLE_UNIT_TESTS=OFF -DENABLE_FUNC_TESTS=OFF

Second, I use the cmake --build build command, and get the following error message:
-- Package 'openssl', required by 'grpc', not found

I checked the grpc project, and it uses boringssl-with-bazel as its SSL implementation.
The following code is in the grpc.pc file.

Name: gRPC
Description: high performance general RPC framework
Version: 27.0.0
Cflags: -I${includedir}
Requires: ... openssl...
Libs: -L${libdir} -lgrpc -laddress_sorting -lre2 -lupb -lcares -lz
Libs.private: 

The grpc.pc requires openssl.pc, but the grpc project doesn't generate openssl.pc.

[novumdxw]

I modified the grpc.pc file in build_dir by removing 'openssl' from Requires and adding '-lssl -lcrypto' to Libs.
As a result, the project can be built successful.

[novumdxw]

I have a question: Why use pkg_check_modules instead of find_package to locate the gPRC library?

When I build project, I notice that pkg_check_modules takes a lot of time.

[novumdxw]

The following code is in the gRPCTargets.cmake:

# Create imported target gRPC::ssl
add_library(gRPC::ssl STATIC IMPORTED)

# Create imported target gRPC::crypto
add_library(gRPC::crypto STATIC IMPORTED)

set_target_properties(gRPC::crypto PROPERTIES
  INTERFACE_LINK_LIBRARIES "pthread"
)

I think this defines the built-in ssl and crypto library.
By replacing pkg_ckeck_modules with find_package in CMakelists.txt, I am able to build project successful.