From 601cff702c33cded7e251a474a38fd03c31b4c71 Mon Sep 17 00:00:00 2001
From: Gertjan van den Burg <gertjanvandenburg@gmail.com>
Date: Mon, 9 Mar 2020 16:27:26 +0000
Subject: Try to detect the linear algebra package automatically

---
 Makefile       | 20 +++++++++++++++++---
 tests/Makefile |  9 ++++++---
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index 6f0385c..300cdc4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,14 @@
+# Makefile for GenSVM
+#
+# Author: G.J.J. van den Burg
+# Copyright (c) 2016 G.J.J. van den Burg
+# License: GPLv2
+#
+
+SHELL := bash
+.SHELLFLAGS := -eu -o pipefail -c
+MAKEFLAGS += --warn-undefined-variables --no-builtin-rules
+
 VERSION=0.2.2
 CC=gcc
 CFLAGS=-Wall -Wno-unused-result -Wsign-compare -Wstrict-prototypes \
@@ -9,6 +20,7 @@ DOCDIR=doc
 DOXYFILE=$(DOCDIR)/Doxyfile
 LCOV=lcov
 GENHTML=genhtml
+LDFLAGS+=-lcblas -llapack -lm
 
 EXECS=gensvm gensvm_grid
 
@@ -21,10 +33,12 @@ OBJ=$(patsubst %.c,%.o,$(SRC))
 
 all: lib/libgensvm.a $(EXECS)
 
-ifdef NOATLAS
-override LDFLAGS+=-lcblas -llapack -lm -lopenblas
+ifneq ($(strip $(shell ldconfig -p | grep libopenblas)),)
+override LDFLAGS+=-lopenblas
+else ifneq ($(shell ldconfig -p | grep libatlas),)
+override LDFLAGS+=-latlas
 else
-override LDFLAGS+=-lcblas -llapack -lm -latlas
+$(error No OpenBLAS or ATLAS found, please install either or alter this Makefile. If you believe this is a bug please open an issue at https://www.github.com/GjjvdBurg/GenSVM)
 endif
 
 debug: CFLAGS += -DDEBUG
diff --git a/tests/Makefile b/tests/Makefile
index 8d00c35..dc6001a 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -2,11 +2,14 @@ CC=gcc
 CFLAGS=-Wall -Wno-unused-result -Wsign-compare -g -rdynamic -DNDEBUG $(OPTFLAGS)
 INCLUDE=-I../include/ -I./include
 LIB=-L../lib
+LDFLAGS+=-lcblas -llapack -lm -lgensvm
 
-ifdef NOATLAS
-override LDFLAGS+=-lm -lcblas -llapack -lgensvm
+ifneq ($(strip $(shell ldconfig -p | grep libopenblas)),)
+override LDFLAGS+=-lopenblas
+else ifneq ($(shell ldconfig -p | grep libatlas),)
+override LDFLAGS+=-latlas
 else
-override LDFLAGS+=-lm -lcblas -llapack -latlas -lgensvm
+$(error No OpenBLAS or ATLAS found, please install either or alter this Makefile)
 endif
 
 TEST_SRC=$(wildcard src/test_*.c)
-- 
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