Merge pull request #3786 from martin-frbg/issue3784

Disable the gfortran tree vectorizer for lapack-netlib

Makefile

@@ -278,7 +278,11 @@ prof_lapack : lapack_prebuild
 lapack_prebuild :
 ifeq ($(NO_LAPACK), $(filter 0,$(NO_LAPACK)))
 	-@echo "FC          = $(FC)" > $(NETLIB_LAPACK_DIR)/make.inc
+ifeq ($(F_COMPILER), GFORTRAN)
+	-@echo "override FFLAGS      = $(LAPACK_FFLAGS) -fno-tree-vectorize" >> $(NETLIB_LAPACK_DIR)/make.inc
+else
 	-@echo "override FFLAGS      = $(LAPACK_FFLAGS)" >> $(NETLIB_LAPACK_DIR)/make.inc
+endif
 	-@echo "FFLAGS_DRV  = $(LAPACK_FFLAGS)" >> $(NETLIB_LAPACK_DIR)/make.inc
 	-@echo "POPTS       = $(LAPACK_FPFLAGS)" >> $(NETLIB_LAPACK_DIR)/make.inc
 	-@echo "FFLAGS_NOOPT       = -O0 $(LAPACK_NOOPT)" >> $(NETLIB_LAPACK_DIR)/make.inc

cmake/lapack.cmake

@@ -999,6 +999,9 @@ endforeach ()
 
 if (NOT C_LAPACK)
   set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_FFLAGS}")
+  if (${F_COMPILER} STREQUAL "GFORTRAN")
+    set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_FFLAGS} -fno-tree-vectorize")
+  endif()
 else ()
   set_source_files_properties(${LA_SOURCES} PROPERTIES COMPILE_FLAGS "${LAPACK_CFLAGS}")
 endif ()