From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Mon, 26 Nov 2012 23:41:35 +0000 (+0100)
Subject: Only run the pkg-config line for Eigen3 once.
X-Git-Tag: 1.0~198
X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=9cae3a759486e8dd608b5ff3c119b3a98f86ac6c

Only run the pkg-config line for Eigen3 once.

Also, print an error message if pkg-config has failed.
---

diff --git a/Makefile b/Makefile
index f7ba81e..1ab3d9c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,13 @@
 GTEST_DIR = /usr/src/gtest
 
+EIGEN_CXXFLAGS := $(shell pkg-config --cflags eigen3)
+ifeq ($(EIGEN_CXXFLAGS),)
+$(error Empty EIGEN_CXXFLAGS. You probably need to install Eigen3)
+endif
+
 CC=gcc
 CXX=g++
-CXXFLAGS=-Wall -g -I$(GTEST_DIR)/include $(shell pkg-config --cflags eigen3 )
+CXXFLAGS=-Wall -g -I$(GTEST_DIR)/include $(EIGEN_CXXFLAGS)
 LDFLAGS=-lSDL -lSDL_image -lGL -lrt -lpthread
 RANLIB=ranlib