I started writing a CMake based project, and I have installed the boost library and Quadmath, using Arch Linux and GCC.
When I use:
#include <boost/multiprecision/float128.hpp>
It raises the error that 'quadmath.h' is not found.
But it is definetly present in my system under /usr/lib/gcc/x86_64-pc-linux-gnu/14.2.1/include
.
I tried to write my own FindQuadmath.cmake
with this content:
include(FindPackageHandleStandardArgs)
include_directories("/usr/lib/gcc/x86_64-pc-linux-gnu/14.2.1/include")
find_path(Quadmath_INCLUDE_DIR NAMES quadmath.h
PATHS "/usr/lib/gcc/x86_64-pc-linux-gnu/14.2.1/include")
find_library(Quadmath_LIBRARY NAMES quadmath)
message("Quadmath_INCLUDE_DIR: ${Quadmath_INCLUDE_DIR}")
message("Quadmath_LIBRARY: ${Quadmath_LIBRARY}")
add_library(Quadmath SHARED IMPORTED ${Quadmath_LIBRARY})
target_include_directories(Quadmath INTERFACE ${Quadmath_INCLUDE_DIR})
set_property(TARGET Quadmath PROPERTY IMPORTED_LOCATION ${Quadmath_LIBRARY})
set_property(TARGET Quadmath PROPERTY INCLUDE_DIRECTORIES ${Quadmath_INCLUDE_DIR})
find_package_handle_standard_args(Quadmath DEFAULT_MSG Quadmath_LIBRARY Quadmath_INCLUDE_DIR)
In the top level Cmake, I include this FindQuadmath.
Current project structure:
├── cmake
│ └── FindQuadmath.cmake
├── CMakeLists.txt
├── conanfile.txt
├── conan_profiles
│ └── phd
├── README.md
├── requirements.txt
├── solvers
│ ├── CMakeLists.txt
│ └── heat_transfer_explicit_scheme
│ ├── CMakeLists.txt
│ ├── include
│ │ └── heat_transfer_explicit_scheme.hpp
│ └── src
│ └── heat_transfer_explicit_scheme.cpp
└── tests
cmake_minimum_required(VERSION 3.30)
project(phd_project CXX)
include(cmake/FindQuadmath.cmake)
find_package(Boost REQUIRED)
add_subdirectory(solvers/)
Neither I, nor boost can find headers such as <quadmath.h>
and others from this lib.
How do I fix this and link Quadmath with CMake?
I have multiple issues.
boost::multiprecision::float128
requires adding explicit link option:add_link_options(
-lquadmath)
For some reason, Boost CMake target does not encapsulate it? After that, the code can be compiled and executed, thus, it is a solution for the issue from this thread. This note I found here: https://www.boost.org/doc/libs/1_65_0/libs/math/example/float128_example.cpp
<quadmath.h>
, but I posted the question about that here: clangd false positive '<quadmath.h>' not found