From ebfed5a51298fc03ad0c39c18b3ca723014d5c85 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 21 Sep 2011 10:27:38 +0200
Subject: Enable incomplete BLAS/Lapack builds when no fortran compiler has
 been found. Works here with gcc. Hopefully this will work for MSVC too.

---
 CMakeLists.txt                  | 16 +++++++---------
 blas/CMakeLists.txt             | 19 +++++++++++++++----
 lapack/CMakeLists.txt           |  9 ++++++---
 unsupported/test/CMakeLists.txt | 14 +++++---------
 4 files changed, 33 insertions(+), 25 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9c37c96e9..ab44f22c1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -343,15 +343,13 @@ else()
   add_subdirectory(test EXCLUDE_FROM_ALL)
 endif()
 
-if(NOT MSVC)
-  if(EIGEN_LEAVE_TEST_IN_ALL_TARGET)
-    add_subdirectory(blas)
-    add_subdirectory(lapack)
-  else()
-    add_subdirectory(blas EXCLUDE_FROM_ALL)
-    add_subdirectory(lapack EXCLUDE_FROM_ALL)
-  endif()
-endif(NOT MSVC)
+if(EIGEN_LEAVE_TEST_IN_ALL_TARGET)
+  add_subdirectory(blas)
+  add_subdirectory(lapack)
+else()
+  add_subdirectory(blas EXCLUDE_FROM_ALL)
+  add_subdirectory(lapack EXCLUDE_FROM_ALL)
+endif()
 
 add_subdirectory(unsupported)
 
diff --git a/blas/CMakeLists.txt b/blas/CMakeLists.txt
index 1811a18a7..03346a936 100644
--- a/blas/CMakeLists.txt
+++ b/blas/CMakeLists.txt
@@ -13,16 +13,25 @@ if( NOT DEFINED EIGEN_Fortran_COMPILER_WORKS OR EIGEN_Fortran_COMPILER_WORKS)
   
 endif()
 
+add_custom_target(blas)
+
+set(EigenBlas_SRCS single.cpp double.cpp complex_single.cpp complex_double.cpp xerbla.cpp)
+
 if(CMAKE_Fortran_COMPILER_WORKS)
 
-add_custom_target(blas)
+message(WARNING " No fortran compiler has been detected, the blas build will be incomplete.")
 
-set(EigenBlas_SRCS single.cpp double.cpp complex_single.cpp complex_double.cpp xerbla.cpp
+set(EigenBlas_SRCS ${EigenBlas_SRCS}
     complexdots.f
     srotm.f srotmg.f drotm.f drotmg.f
-    lsame.f   chpr2.f  ctbsv.f  dspmv.f  dtbmv.f  dtpsv.f ssbmv.f  sspr.f   stpmv.f     zhpr2.f  ztbsv.f chbmv.f  chpr.f   ctpmv.f     dspr2.f dtbsv.f  sspmv.f  stbmv.f  stpsv.f   zhbmv.f  zhpr.f   ztpmv.f chpmv.f  ctbmv.f  ctpsv.f    dsbmv.f  dspr.f   dtpmv.f   sspr2.f  stbsv.f  zhpmv.f  ztbmv.f  ztpsv.f
+    lsame.f   chpr2.f  ctbsv.f  dspmv.f  dtbmv.f  dtpsv.f ssbmv.f  sspr.f   stpmv.f
+    zhpr2.f  ztbsv.f chbmv.f  chpr.f   ctpmv.f     dspr2.f dtbsv.f  sspmv.f  stbmv.f  stpsv.f
+    zhbmv.f  zhpr.f   ztpmv.f chpmv.f  ctbmv.f  ctpsv.f    dsbmv.f  dspr.f   dtpmv.f   sspr2.f
+    stbsv.f  zhpmv.f  ztbmv.f  ztpsv.f
 )
 
+endif(CMAKE_Fortran_COMPILER_WORKS)
+
 add_library(eigen_blas_static ${EigenBlas_SRCS})
 add_library(eigen_blas SHARED ${EigenBlas_SRCS})
 
@@ -38,6 +47,7 @@ install(TARGETS eigen_blas eigen_blas_static
         LIBRARY DESTINATION lib
         ARCHIVE DESTINATION lib)
 
+if(CMAKE_Fortran_COMPILER_WORKS)
 
 if(EIGEN_LEAVE_TEST_IN_ALL_TARGET)
   add_subdirectory(testing) # can't do EXCLUDE_FROM_ALL here, breaks CTest
@@ -45,4 +55,5 @@ else()
   add_subdirectory(testing EXCLUDE_FROM_ALL)
 endif()
 
-endif(CMAKE_Fortran_COMPILER_WORKS)
+endif()
+
diff --git a/lapack/CMakeLists.txt b/lapack/CMakeLists.txt
index 32fd6ad81..ad7c04274 100644
--- a/lapack/CMakeLists.txt
+++ b/lapack/CMakeLists.txt
@@ -13,15 +13,16 @@ if( NOT DEFINED EIGEN_Fortran_COMPILER_WORKS OR EIGEN_Fortran_COMPILER_WORKS)
   
 endif()
 
-if(CMAKE_Fortran_COMPILER_WORKS)
 
 add_custom_target(lapack)
 include_directories(../blas)
 
 set(EigenLapack_SRCS
-single.cpp double.cpp complex_single.cpp complex_double.cpp
+single.cpp double.cpp complex_single.cpp complex_double.cpp ../blas/xerbla.cpp
 )
 
+if(CMAKE_Fortran_COMPILER_WORKS)
+
 get_filename_component(eigen_full_path_to_reference_to_reference_lapack "./reference/" ABSOLUTE)
 if(EXISTS ${eigen_full_path_to_reference_to_reference_lapack})
 set(EigenLapack_SRCS ${EigenLapack_SRCS}
@@ -357,6 +358,8 @@ reference/ctbcon.f               reference/dormhr.f               reference/sla_
 )
 endif()
 
+endif(CMAKE_Fortran_COMPILER_WORKS)
+
 add_library(eigen_lapack_static ${EigenLapack_SRCS})
 add_library(eigen_lapack SHARED ${EigenLapack_SRCS})
 
@@ -373,4 +376,4 @@ install(TARGETS eigen_lapack eigen_lapack_static
         ARCHIVE DESTINATION lib)
 
 #   add_subdirectory(testing)
-endif(CMAKE_Fortran_COMPILER_WORKS)
+
diff --git a/unsupported/test/CMakeLists.txt b/unsupported/test/CMakeLists.txt
index cd50c48e1..c84cccc52 100644
--- a/unsupported/test/CMakeLists.txt
+++ b/unsupported/test/CMakeLists.txt
@@ -4,15 +4,11 @@ include_directories(../../test ../../unsupported ../../Eigen
 
 set(SPARSE_LIBS "")
 
-# configure blas/lapack
-if(CMAKE_Fortran_COMPILER_WORKS)
-  set(BLAS_FOUND TRUE)
-  set(LAPACK_FOUND TRUE)
-  set(BLAS_LIBRARIES eigen_blas_static)
-  set(LAPACK_LIBRARIES eigen_lapack_static)
-else()
-  # TODO search for default blas/lapack
-endif()
+# configure blas/lapack (use Eigen's by default)
+set(BLAS_FOUND TRUE)
+set(LAPACK_FOUND TRUE)
+set(BLAS_LIBRARIES eigen_blas)
+set(LAPACK_LIBRARIES eigen_lapack)
 
 find_package(Cholmod)
 if(CHOLMOD_FOUND AND BLAS_FOUND AND LAPACK_FOUND)
-- 
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