Add support for quadruple and extended double precision support (#6)

- Fpm will require preprocessor defines -DWITH_QP={0|1} and -DWITH_XDP={0|1}
- meson and cmake will attempt to run test programs to automatically determine this information
- make driver procedures recursive to allow running the testsuites in strict mode
- provide is_nan implementation for compiler not having IEEE arithmetic support

Author: awvwgk

.github/workflows/build.yml

@@ -47,12 +47,6 @@ jobs:
           compiler: gnu
           version: 10
 
-        - os: macos-latest
-          build: meson
-          build-type: debug
-          compiler: gnu
-          version: 5
-
         - os: macos-latest
           build: cmake
           build-type: debug

CMakeLists.txt

@@ -56,6 +56,12 @@ target_include_directories(
   $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${module-dir}>
 )
+target_compile_definitions(
+  "${PROJECT_NAME}-lib"
+  PRIVATE
+  "WITH_QP=$<BOOL:${WITH_QP}>"
+  "WITH_XDP=$<BOOL:${WITH_XDP}>"
+)
 
 # Export targets for other projects
 add_library("${PROJECT_NAME}" INTERFACE)

config/CMakeLists.txt

@@ -32,6 +32,18 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   )
 endif()
 
+include(CheckFortranSourceRuns)
+check_fortran_source_runs(
+  "if (selected_real_kind(33) == -1) stop 1; end"
+  WITH_QP
+)
+set(WITH_QP ${WITH_QP} PARENT_SCOPE)
+check_fortran_source_runs(
+  "if (any(selected_real_kind(18) == [-1, selected_real_kind(33)])) stop 1; end"
+  WITH_XDP
+)
+set(WITH_XDP ${WITH_XDP} PARENT_SCOPE)
+
 include(CMakePackageConfigHelpers)
 configure_package_config_file(
   "${CMAKE_CURRENT_SOURCE_DIR}/template.cmake"

config/meson.build

@@ -53,3 +53,11 @@ if get_option('openmp')
   omp_dep = dependency('openmp')
   lib_deps += omp_dep
 endif
+
+with_qp = fc.run('if (selected_real_kind(33) == -1) stop 1; end').returncode() == 0
+with_xdp = fc.run('if (any(selected_real_kind(18) == [-1, selected_real_kind(33)])) stop 1; end').returncode() == 0
+add_project_arguments(
+  '-DWITH_QP=@0@'.format(with_qp.to_int()),
+  '-DWITH_XDP=@0@'.format(with_xdp.to_int()),
+  language: 'fortran',
+)

config/template.cmake

@@ -1,5 +1,8 @@
 @PACKAGE_INIT@
 
+set("@PROJECT_NAME@_WITH_QP" @WITH_QP@)
+set("@PROJECT_NAME@_WITH_XDP" @WITH_XDP@)
+
 if(NOT TARGET "@PROJECT_NAME@::@PROJECT_NAME@")
   include("${CMAKE_CURRENT_LIST_DIR}/@[email protected]")
 endif()

src/CMakeLists.txt

@@ -15,7 +15,7 @@ set(dir "${CMAKE_CURRENT_SOURCE_DIR}")
 
 list(
   APPEND srcs
-  "${dir}/testdrive.f90"
+  "${dir}/testdrive.F90"
   "${dir}/testdrive_version.f90"
 )
 

src/meson.build

@@ -12,6 +12,6 @@
 # limitations under the License.
 
 srcs += files(
-  'testdrive.f90',
+  'testdrive.F90',
   'testdrive_version.f90',
 )