CMake: always install lapack.h header

fixes #632

Author: christoph-conrads

CMakeLists.txt

@@ -392,9 +392,8 @@ endif()
 set(LAPACK_INSTALL_EXPORT_NAME ${LAPACK_INSTALL_EXPORT_NAME_CACHE})
 unset(LAPACK_INSTALL_EXPORT_NAME_CACHE)
 
-if(LAPACKE)
-  add_subdirectory(LAPACKE)
-endif()
+add_subdirectory(LAPACKE)
+
 
 #-------------------------------------
 # BLAS++ / LAPACK++

LAPACKE/CMakeLists.txt

@@ -1,8 +1,3 @@
-message(STATUS "LAPACKE enable")
-enable_language(C)
-
-set(LAPACK_INSTALL_EXPORT_NAME ${LAPACKELIB}-targets)
-
 # Create a header file lapacke_mangling.h for the routines called in my C programs
 include(FortranCInterface)
 ## Ensure that the fortran compiler and c compiler specified are compatible
@@ -16,8 +11,20 @@ if(NOT FortranCInterface_GLOBAL_FOUND OR NOT FortranCInterface_MODULE_FOUND)
                  ${LAPACK_BINARY_DIR}/include/lapacke_mangling.h)
 endif()
 
-include_directories(include ${LAPACK_BINARY_DIR}/include)
 add_subdirectory(include)
+
+
+if(NOT LAPACKE)
+    return()
+endif()
+
+
+message(STATUS "LAPACKE enabled")
+enable_language(C)
+
+set(LAPACK_INSTALL_EXPORT_NAME ${LAPACKELIB}-targets)
+
+include_directories(include ${LAPACK_BINARY_DIR}/include)
 add_subdirectory(src)
 add_subdirectory(utils)
 

LAPACKE/include/CMakeLists.txt

@@ -1,3 +1,7 @@
-set(LAPACKE_INCLUDE lapacke.h lapack.h lapacke_config.h lapacke_utils.h)
+set(LAPACKE_INCLUDE lapack.h)
+
+IF(LAPACKE)
+    list(APPEND LAPACKE_INCLUDE lapacke.h lapacke_config.h lapacke_utils.h)
+endif()
 
 file(COPY ${LAPACKE_INCLUDE} DESTINATION ${LAPACK_BINARY_DIR}/include)