[BUG] -DCMAKE_PREFIX_PATH not finding hiredis

[aka-mj]

I'm using ExternalProject_Add in CMake to build hiredis and then build redis++. The source code is vendored so it can be included in the project. I'm installing hiredis in a non-standard location, so I'm passing -DCMAKE_PREFIX_PATH to redis++ as specified in the documentation. However, it appears redis++ is not finding hiredis.

Here is the snippet from my CMakeLists.txt

set(EXTERNAL_INSTALL_LOCATION ${CMAKE_BINARY_DIR}/external)

ExternalProject_Add(hiredis
    PREFIX ${EXTERNAL_INSTALL_LOCATION}/hiredis
    SOURCE_DIR ${CMAKE_SOURCE_DIR}/vendor/hiredis
    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTERNAL_INSTALL_LOCATION}/hiredis -DBUILD_SHARED_LIBS=OFF -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
	BUILD_ALWAYS TRUE
	BUILD_IN_SOURCE FALSE
)
set(HIREDIS_HEADER ${EXTERNAL_INSTALL_LOCATION}/hiredis/include)
message(STATUS "HIREDIS_HEADER: ${HIREDIS_HEADER}")

set(HIREDIS_LIB ${EXTERNAL_INSTALL_LOCATION}/hiredis/lib/libhiredis.a)
message(STATUS "HIREDIS_LIB: ${HIREDIS_LIB}")

set(CMAKE_INCLUDE_PATH "${CMAKE_INCLUDE_PATH};${EXTERNAL_INSTALL_LOCATION}/hiredis/include")
set(CMAKE_LIBRARY_PATH "${CMAKE_LIBRARY_PATH};${EXTERNAL_INSTALL_LOCATION}/hiredis/lib")

# --- Add redis-plus-plus library ---
ExternalProject_Add(redis-plus-plus
    PREFIX ${EXTERNAL_INSTALL_LOCATION}/hiredis
    SOURCE_DIR ${CMAKE_SOURCE_DIR}/vendor/redis-plus-plus
    CMAKE_ARGS 
        -DCMAKE_INSTALL_PREFIX=${EXTERNAL_INSTALL_LOCATION}/hiredis
        -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
        -DCMAKE_PREFIX_PATH=${EXTERNAL_INSTALL_LOCATION}/hiredis
        -DREDIS_PLUS_PLUS_BUILD_TEST=OFF
    BUILD_ALWAYS TRUE
    BUILD_IN_SOURCE FALSE
)

This is the error from CMake:

-- redis-plus-plus version: 1.3.13
-- The CXX compiler identification is Clang 13.0.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /home/mjohn/workspace/cm/apps/settings/cross/bin/x86_64-linux-musl-clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- redis-plus-plus build type: Release
-- redis-plus-plus build with CXX standard: c++17
-- redis-plus-plus TLS support: OFF
-- redis-plus-plus check hiredis features
-- Looking for redisEnableKeepAliveWithInterval
-- Looking for redisEnableKeepAliveWithInterval - not found
-- redis-plus-plus build static library: ON
-- redis-plus-plus build static library with position independent code: ON
-- redis-plus-plus build shared library: ON
-- redis-plus-plus build test: OFF
-- Debian package name: .deb
-- Configuring done (0.2s)
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
HIREDIS_LIB
    linked by target "redis++" in directory /home/mjohn/workspace/cm/apps/settings/vendor/redis-plus-plus

CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of
  "redis++_static":

    "HIREDIS_HEADER-NOTFOUND"



CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "redis++":

    "HIREDIS_HEADER-NOTFOUND"

Any ideas on what I could troubleshoot?

[sewenew]

I'm not an expert on CMAKE, but you can take this issue for reference. With the solution mentioned in the issue, you should solve the problem.

Regards

[sewenew]

Since there's no update, I'll close this issue.

Regards