Oh, indeed, the MKL header does not actually appear in my example. I have boiled it down from the following situation, where adding MKL to my CMake project made compilaition fail:
main.cpp
#include <float.h>
#include <iostream>
int main() { std::cout << FLT_RADIX << std::endl; };
CMakeLists.txt
cmake_minimum_required(VERSION 3.20..3.22)
project(MklTest LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 17)
add_executable(main main.cpp)
#-------------------------------------------------------------------------------
# Works if I remove this snippet.
find_package(PkgConfig REQUIRED)
pkg_search_module(MKL mkl-dynamic-lp64-iomp)
target_include_directories(main PRIVATE ${MKL_INCLUDE_DIRS})
#-------------------------------------------------------------------------------
target_link_libraries(main PRIVATE toml++)
FWIU, the the generated variable MKL_INCLUDE_DIRS expands to several paths, including the actual MKL headers and the `compiler/include` header that makes compilation fails with the "undeclared FLT_RADIX" error if the `CCX` environment variable is set to either a GCC or a CLANG compiler, but not if set to ICPX.
Considering that you do expect MKL to be compatible with other compilers and libraries.. then maybe the problem actually lies within the CMake heuristic supposed to find MKL modules?
At this point, maybe I should provide more information about my system and a step by step procedure to help you reproduce. Sorry for not having done this earlier:
$ neofetch
-` iago-lito@copak
.o+` ---------------
`ooo/ OS: Arch Linux x86_64
`+oooo: Host: Precision 3460
`+oooooo: Kernel: 6.5.2-arch1-1
-+oooooo+: Uptime: 1 day, 15 hours, 38 mins
`/:-:++oooo+: Packages: 1339 (pacman)
`/++++/+++++++: Shell: zsh 5.9
`/++++++++++++++: Resolution: 2560x1440
`/+++ooooooooooooo/` DE: GNOME 44.4
./ooosssso++osssssso+` WM: Mutter
.oossssso-````/ossssss+` WM Theme: Adwaita
-osssssso. :ssssssso. Theme: Adwaita [GTK2/3]
:osssssss/ osssso+++. Icons: Adwaita [GTK2/3]
/ossssssss/ +ssssooo/- Terminal: alacritty
`/ossssso+/:- -:/+osssso+- CPU: 12th Gen Intel i7-12700 (20) @ 4.800GHz
`+sso+:-` `.-/+oso: GPU: NVIDIA T400 4GB
`++:. `-/+/ GPU: Intel AlderLake-S GT1
.` `/ Memory: 9816MiB / 31787MiB
$ pacman -Qi intel-oneapi-mkl
Name : intel-oneapi-mkl
Version : 2023.2.0_49495-2
Description : Intel oneAPI Math Kernel Library
Architecture : x86_64
URL : https://software.intel.com/content/www/us/en/develop/tools/oneapi.html
Licenses : custom
Groups : None
Provides : intel-mkl intel-mkl-static
Depends On : intel-oneapi-compiler-dpcpp-cpp-runtime intel-oneapi-tbb intel-oneapi-common
Optional Deps : None
Required By : python-pytorch-cuda
Optional For : None
Conflicts With : intel-mkl intel-mkl-static intel-oneapi-basekit
Replaces : intel-mkl intel-mkl-static
Installed Size : 3.16 GiB
Packager : Torsten Keßler <tpkessler@archlinux.org>
Build Date : Sat 02 Sep 2023 04:22:23 PM CEST
Install Date : Mon 04 Sep 2023 05:44:01 PM CEST
Install Reason : Installed as a dependency for another package
Install Script : No
Validated By : Signature
Prepare folder with the two files above:
.
├── CMakeLists.txt
└── main.cpp
Fail build with:
$ cmake .
-- The CXX compiler identification is GNU 13.2.1
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PkgConfig: /usr/bin/pkg-config (found version "1.8.1")
-- Checking for one of the modules 'mkl-dynamic-lp64-iomp'
-- Configuring done (0.3s)
-- Generating done (0.0s)
-- Build files have been written to: .
$ make
[ 50%] Building CXX object CMakeFiles/main.dir/main.cpp.o
./tp/main.cpp: In function ‘int main()’:
./tp/main.cpp:4:27: error: ‘FLT_RADIX’ was not declared in this scope
4 | int main() { std::cout << FLT_RADIX << std::endl; };
| ^~~~~~~~~
make[2]: *** [CMakeFiles/main.dir/build.make:76: CMakeFiles/main.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/main.dir/all] Error 2
make: *** [Makefile:91: all] Error 2
Here is a docker recipe to (hopefully) reproduce on another distro/OS:
Dockerfile
# syntax=docker/dockerfile:1.3-labs
FROM archlinux
RUN <<EOF
pacman -Syu --noconfirm
pacman -Sy --noconfirm base-devel cmake intel-oneapi-mkl
mkdir /test
EOF
WORKDIR /test
COPY ./main.cpp .
COPY ./CMakeLists.txt .
RUN cmake .
ENTRYPOINT ["make"]
Build image with:
$ docker buildx build -t mkltest .
Run and fail compilation with:
$ docker run --rm -it mkltest
[ 50%] Building CXX object CMakeFiles/main.dir/main.cpp.o
/test/main.cpp: In function ‘int main()’:
/test/main.cpp:4:27: error: ‘FLT_RADIX’ was not declared in this scope
4 | int main() { std::cout << FLT_RADIX << std::endl; };
| ^~~~~~~~~
make[2]: *** [CMakeFiles/main.dir/build.make:76: CMakeFiles/main.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/main.dir/all] Error 2
make: *** [Makefile:91: all] Error 2
Can you reproduce?
