clean up LAPACK configuration -- now does it properly, the same way

the elliptic-solver thorns do PETSc


git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinAnalysis/AHFinderDirect/trunk@722 f88db872-0e4f-0410-b76b-b9085cfa78c5

1 files changed, 19 insertions, 7 deletions

diff --git a/src/make.configuration.defn b/src/make.configuration.defn
index fca6781..050e60e 100644
--- a/src/make.configuration.defn
+++ b/src/make.configuration.defn
@@ -1,14 +1,26 @@
 # additional configuration information for Cactus to build this thorn
 # $Header$
 
-# environment variable LAPACK_DIR, if set (should be a blank-separated
-# list of directories), says where to look for LAPACK/BLAS libraries
-ifneq ($(strip $(LAPACK_DIR)), )
-  LIBDIRS += $(LAPACK_DIR)
+# check if LAPACK_DIR is set, bail out if not
+ifeq ($(strip $(LAPACK_DIR)),)
+$(NAME): MissingLAPACK_DIR
+.pseudo: MissingLAPACK_DIR
+MissingLAPACK_DIR:
+	@echo 'thorn AHFinderDirect uses LAPACK (which in turn uses BLAS)'
+	@echo '==> must set LAPACK_DIR = directory (or blank-separated directory search list)'
+	@echo '                          in which LAPACK and BLAS libraries live'
+	exit 2
 endif
 
-# n.b. lapack and blas need to go at the *front* of other libs
+LIBDIRS += $(LAPACK_DIR)
+
+#
+# Note that LAPACK and BLAS need to go at the *front* of other libs
 #      since they may use libm etc
-# n.b. g2c is needed here if and only if g77 is use for any code
-#      (eg on linux lapack/blas rpms are usually built with g77)
+#
+# FIXME: g2c is appropriate here if and only if g77 is use for any code
+#	 (eg on linux lapack/blas rpms are usually built with g77);
+#	 we should really check whether g77 is in use instead of
+#	 hard-coding this
+#
 LIBS := lapack blas g2c $(LIBS)