Merge pull request #1009 from lepus2589/1008-allow-installing-of-bina…

…ries-to-subdirectory-while-keeping-cmake-package-scripts-in-the-same-place

#1008 Allow installing binaries to subdirectory while keeping CMake package scripts in the same place

CMakeLists.txt

@@ -159,12 +159,18 @@ endif()
 # --------------------------------------------------
 set(LAPACK_INSTALL_EXPORT_NAME ${LAPACKLIB}-targets)
 
+set(LAPACK_BINARY_PATH_SUFFIX "" CACHE STRING "Path suffix appended to the install path of binaries")
+
+if(NOT "${LAPACK_BINARY_PATH_SUFFIX}" STREQUAL "" AND NOT "${LAPACK_BINARY_PATH_SUFFIX}" MATCHES "^/")
+  set(LAPACK_BINARY_PATH_SUFFIX "/${LAPACK_BINARY_PATH_SUFFIX}")
+endif()
+
 macro(lapack_install_library lib)
   install(TARGETS ${lib}
     EXPORT ${LAPACK_INSTALL_EXPORT_NAME}
-    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT Development
-    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT RuntimeLibraries
-    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT RuntimeLibraries
+    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}${LAPACK_BINARY_PATH_SUFFIX}" COMPONENT Development
+    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}${LAPACK_BINARY_PATH_SUFFIX}" COMPONENT RuntimeLibraries
+    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}${LAPACK_BINARY_PATH_SUFFIX}" COMPONENT RuntimeLibraries
   )
 endmacro()
 
@@ -557,7 +563,7 @@ install(FILES
 if (LAPACK++)
   install(
   DIRECTORY "${LAPACK_BINARY_DIR}/lib/"
-  DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}${LAPACK_BINARY_PATH_SUFFIX}"
   FILES_MATCHING REGEX "liblapackpp.(a|so)$"
   )
   install(
@@ -590,7 +596,7 @@ if (BLAS++)
   )
   install(
   DIRECTORY "${LAPACK_BINARY_DIR}/lib/"
-  DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}${LAPACK_BINARY_PATH_SUFFIX}"
   FILES_MATCHING REGEX "libblaspp.(a|so)$"
   )
   install(

README.md

@@ -79,7 +79,7 @@ CBLAS, a C interface to the BLAS, and (5) LAPACKE, a C interface to LAPACK.
    ```sh
    mkdir build
    cd build
-   cmake -DCMAKE_INSTALL_LIBDIR=$HOME/.local/lapack ..
+   cmake -DCMAKE_INSTALL_PREFIX=$HOME/.local/lapack ..
    cmake --build . -j --target install
    ```
  - LAPACK can be built and installed using [vcpkg](https://github.com/Microsoft/vcpkg/) dependency manager: