modify build system to auto-detect eigen3, and fallback to eigen2

1 files changed, 75 insertions, 0 deletions

diff --git a/eigen.pri b/eigen.pri
new file mode 100644
index 0000000..4d9ab90
--- /dev/null
+++ b/eigen.pri
@@ -0,0 +1,75 @@
+# Detect eigen3 + eigen2, then use this priority list to determine
+# which eigen to use:
+#
+# Priority
+# 3. EIGEN3DIR / EIGEN2DIR if set
+# 1. OPENSCAD_LIBRARIES eigen3
+# 2. OPENSCAD_LIBRARIES eigen2
+# 4. system's standard include paths for eigen3
+# 5. system's standard include paths for eigen2
+
+eigen {
+
+# read environment variables
+OPENSCAD_LIBRARIES_DIR = $$(OPENSCAD_LIBRARIES)
+EIGEN2_DIR = $$(EIGEN2DIR)
+EIGEN3_DIR = $$(EIGEN3DIR)
+
+CONFIG(mingw-cross-env) {
+  EIGEN_INCLUDEPATH = mingw-cross-env/include/eigen2
+}
+
+# Optionally specify location of Eigen3 using the 
+# OPENSCAD_LIBRARIES env. variable
+!isEmpty(OPENSCAD_LIBRARIES_DIR) {
+	isEmpty(EIGEN_INCLUDEPATH) {
+    exists($$OPENSCAD_LIBRARIES_DIR/include/eigen3) {
+      EIGEN_INCLUDEPATH = $$OPENSCAD_LIBRARIES_DIR/include/eigen3
+    } 
+  }
+	isEmpty(EIGEN_INCLUDEPATH) {
+    exists($$OPENSCAD_LIBRARIES_DIR/include/eigen2) {
+      EIGEN_INCLUDEPATH = $$OPENSCAD_LIBRARIES_DIR/include/eigen2
+    } 
+  }
+}
+
+
+# Optionally specify location of Eigen using the 
+# EIGEN3DIR env. variable
+!isEmpty(EIGEN3_DIR) { 
+  EIGEN_INCLUDEPATH = $$EIGEN3_DIR
+  message("EIGEN3 location: $$EIGEN3_INCLUDEPATH")
+}
+
+# Optionally specify location of Eigen using the 
+# EIGEN2DIR env. variable
+!isEmpty(EIGEN2_DIR) { 
+  EIGEN_INCLUDEPATH = $$EIGEN2_DIR
+  message("EIGEN2 location: $$EIGEN2_INCLUDEPATH")
+}
+
+isEmpty(EIGEN_INCLUDEPATH) {
+  freebsd-g++: EIGEN_INCLUDEPATH = /usr/local/include/eigen3
+  macx: EIGEN_INCLUDEPATH = /opt/local/include/eigen3
+  linux*|hurd*: EIGEN_INCLUDEPATH = /usr/include/eigen3
+  netbsd*: EIGEN_INCLUDEPATH = /usr/pkg/include/eigen3
+  !exists($$EIGEN_INCLUDEPATH) {
+    freebsd-g++: EIGEN_INCLUDEPATH = /usr/local/include/eigen2
+    macx: EIGEN_INCLUDEPATH = /opt/local/include/eigen2
+    linux*|hurd*: EIGEN_INCLUDEPATH = /usr/include/eigen2
+    netbsd*: EIGEN_INCLUDEPATH = /usr/pkg/include/eigen2
+  }
+}
+
+# disable Eigen SIMD optimizations for platforms where it breaks compilation
+!macx {
+  !freebsd-g++ {
+    QMAKE_CXXFLAGS += -DEIGEN_DONT_ALIGN
+  }
+}
+
+# EIGEN being under 'include/eigen[2-3]' needs special prepending
+QMAKE_INCDIR_QT = $$EIGEN_INCLUDEPATH $$QMAKE_INCDIR_QT
+
+} # eigen