xref: /aosp_15_r20/external/eigen/cmake/FindMPREAL.cmake (revision bf2c37156dfe67e5dfebd6d394bad8b2ab5804d4) 
1# Try to find the MPFR C++ (MPREAL) library
2# See http://www.holoborodko.com/pavel/mpreal/
3#
4# This module supports requiring a minimum version, e.g. you can do
5#   find_package(MPREAL 1.8.6)
6# to require version 1.8.6 or newer of MPREAL C++.
7#
8# Once done this will define
9#
10#  MPREAL_FOUND - system has MPREAL lib with correct version
11#  MPREAL_INCLUDES - MPREAL required include directories
12#  MPREAL_LIBRARIES - MPREAL required libraries
13#  MPREAL_VERSION - MPREAL version
14
15# Copyright (c) 2020 The Eigen Authors.
16# Redistribution and use is allowed according to the terms of the BSD license.
17
18include(CMakeFindDependencyMacro)
19find_dependency(MPFR)
20find_dependency(GMP)
21
22# Set MPREAL_INCLUDES
23find_path(MPREAL_INCLUDES
24  NAMES
25  mpreal.h
26  PATHS
27  $ENV{GMPDIR}
28  ${INCLUDE_INSTALL_DIR}
29)
30
31# Set MPREAL_FIND_VERSION to 1.0.0 if no minimum version is specified
32
33if(NOT MPREAL_FIND_VERSION)
34  if(NOT MPREAL_FIND_VERSION_MAJOR)
35    set(MPREAL_FIND_VERSION_MAJOR 1)
36  endif()
37  if(NOT MPREAL_FIND_VERSION_MINOR)
38    set(MPREAL_FIND_VERSION_MINOR 0)
39  endif()
40  if(NOT MPREAL_FIND_VERSION_PATCH)
41    set(MPREAL_FIND_VERSION_PATCH 0)
42  endif()
43
44  set(MPREAL_FIND_VERSION "${MPREAL_FIND_VERSION_MAJOR}.${MPREAL_FIND_VERSION_MINOR}.${MPREAL_FIND_VERSION_PATCH}")
45endif()
46
47# Check bugs
48# - https://github.com/advanpix/mpreal/issues/7
49# - https://github.com/advanpix/mpreal/issues/9
50set(MPREAL_TEST_PROGRAM "
51#include <mpreal.h>
52#include <algorithm>
53int main(int argc, char** argv) {
54  const mpfr::mpreal one  =    1.0;
55  const mpfr::mpreal zero =    0.0;
56  using namespace std;
57  const mpfr::mpreal smaller = min(one, zero);
58  return 0;
59}")
60
61if(MPREAL_INCLUDES)
62
63  # Set MPREAL_VERSION
64
65  file(READ "${MPREAL_INCLUDES}/mpreal.h" _mpreal_version_header)
66
67  string(REGEX MATCH "define[ \t]+MPREAL_VERSION_MAJOR[ \t]+([0-9]+)" _mpreal_major_version_match "${_mpreal_version_header}")
68  set(MPREAL_MAJOR_VERSION "${CMAKE_MATCH_1}")
69  string(REGEX MATCH "define[ \t]+MPREAL_VERSION_MINOR[ \t]+([0-9]+)" _mpreal_minor_version_match "${_mpreal_version_header}")
70  set(MPREAL_MINOR_VERSION "${CMAKE_MATCH_1}")
71  string(REGEX MATCH "define[ \t]+MPREAL_VERSION_PATCHLEVEL[ \t]+([0-9]+)" _mpreal_patchlevel_version_match "${_mpreal_version_header}")
72  set(MPREAL_PATCHLEVEL_VERSION "${CMAKE_MATCH_1}")
73
74  set(MPREAL_VERSION ${MPREAL_MAJOR_VERSION}.${MPREAL_MINOR_VERSION}.${MPREAL_PATCHLEVEL_VERSION})
75
76  # Check whether found version exceeds minimum version
77
78  if(${MPREAL_VERSION} VERSION_LESS ${MPREAL_FIND_VERSION})
79    set(MPREAL_VERSION_OK FALSE)
80    message(STATUS "MPREAL version ${MPREAL_VERSION} found in ${MPREAL_INCLUDES}, "
81                   "but at least version ${MPREAL_FIND_VERSION} is required")
82  else()
83    set(MPREAL_VERSION_OK TRUE)
84
85    list(APPEND MPREAL_INCLUDES "${MPFR_INCLUDES}" "${GMP_INCLUDES}")
86    list(REMOVE_DUPLICATES MPREAL_INCLUDES)
87
88    list(APPEND MPREAL_LIBRARIES "${MPFR_LIBRARIES}" "${GMP_LIBRARIES}")
89    list(REMOVE_DUPLICATES MPREAL_LIBRARIES)
90
91    # Make sure it compiles with the current compiler.
92    unset(MPREAL_WORKS CACHE)
93    include(CheckCXXSourceCompiles)
94    set(CMAKE_REQUIRED_INCLUDES "${MPREAL_INCLUDES}")
95    set(CMAKE_REQUIRED_LIBRARIES "${MPREAL_LIBRARIES}")
96    check_cxx_source_compiles("${MPREAL_TEST_PROGRAM}" MPREAL_WORKS)
97  endif()
98endif()
99
100include(FindPackageHandleStandardArgs)
101find_package_handle_standard_args(MPREAL DEFAULT_MSG
102                                  MPREAL_INCLUDES MPREAL_VERSION_OK MPREAL_WORKS)
103mark_as_advanced(MPREAL_INCLUDES)
104