Follow GNU install conventions

- allow customization of install locations by GNUInstallDirs module
- enable project installation on CI testing

.github/workflows/CI.yml

@@ -59,7 +59,12 @@ jobs:
  brew link gcc@${GCC_V}
 
  - name: Configure with CMake
- run: cmake -Wdev -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAXIMUM_RANK=4 -S . -B build
+ run: >-
+ cmake -Wdev
+ -DCMAKE_BUILD_TYPE=Release
+ -DCMAKE_MAXIMUM_RANK=4
+ -DCMAKE_INSTALL_PREFIX=$PWD/_dist
+ -S . -B build
 
  - name: Build and compile
  run: cmake --build build
@@ -72,6 +77,9 @@ jobs:
  run: ctest --parallel --output-on-failure
  working-directory: build
 
+ - name: Install project
+ run: cmake --install build
+
  - name: Test in-tree builds
  if: contains( matrix.gcc_v, '10') # Only test one compiler on each platform
  run: |
@@ -129,7 +137,12 @@ jobs:
  run: pip install --upgrade fypp
 
  - name: Configure with CMake
- run: cmake -Wdev -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAXIMUM_RANK=4 -S . -B build
+ run: >-
+ cmake -Wdev
+ -DCMAKE_BUILD_TYPE=Release
+ -DCMAKE_MAXIMUM_RANK=4
+ -DCMAKE_INSTALL_PREFIX=$PWD/_dist
+ -S . -B build
 
  - name: Build and compile
  run: cmake --build build
@@ -141,3 +154,6 @@ jobs:
  - name: test
  run: ctest --parallel --output-on-failure
  working-directory: build
+
+ - name: Install project
+ run: cmake --install build

.github/workflows/ci_windows.yml

@@ -99,6 +99,7 @@ jobs:
  -DCMAKE_BUILD_TYPE=Debug
  -DCMAKE_Fortran_FLAGS_DEBUG="-Wall -Wextra -Wimplicit-interface -fPIC -g -fcheck=all -fbacktrace"
  -DCMAKE_MAXIMUM_RANK=4
+ -DCMAKE_INSTALL_PREFIX=$PWD/_dist
  env:
  FC: gfortran
  CC: gcc
@@ -120,3 +121,6 @@ jobs:
  with:
  name: WindowsCMakeTestlog
  path: build/Testing/Temporary/LastTest.log
+
+ - name: Install project
+ run: cmake --install build

CMakeLists.txt

@@ -2,6 +2,9 @@ cmake_minimum_required(VERSION 3.14.0)
 project(stdlib Fortran)
 enable_testing()
 
+# Follow GNU conventions for installation directories
+include(GNUInstallDirs)
+
 include(${PROJECT_SOURCE_DIR}/cmake/stdlib.cmake)
 
 # --- compiler options
@@ -55,5 +58,5 @@ add_subdirectory(src)
 
 install(EXPORT fortran_stdlib-targets
  NAMESPACE fortran_stdlib::
- DESTINATION "lib/cmake/fortran_stdlib"
+ DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/fortran_stdlib"
 )

src/CMakeLists.txt

@@ -64,8 +64,8 @@ add_subdirectory(tests)
 
 install(TARGETS fortran_stdlib
  EXPORT fortran_stdlib-targets
- RUNTIME DESTINATION bin
- ARCHIVE DESTINATION lib
- LIBRARY DESTINATION lib
+ RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+ ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+ LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
 )
-install(DIRECTORY ${LIB_MOD_DIR} DESTINATION include)
+install(DIRECTORY ${LIB_MOD_DIR} DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")