failtest: a new cmake-based test suite for testing stuff that should fail to build. This first batch imports some const correctness checks from bug #54.

failtest/CMakeLists.txt

@@ -0,0 +1,17 @@
+message(STATUS "Running the failtests")
+
+ei_add_failtest("failtest_sanity_check")
+ei_add_failtest("block_nonconst_ctor_on_const_xpr_0")
+ei_add_failtest("block_nonconst_ctor_on_const_xpr_1")
+ei_add_failtest("block_nonconst_ctor_on_const_xpr_2")
+ei_add_failtest("transpose_nonconst_ctor_on_const_xpr")
+ei_add_failtest("diagonal_nonconst_ctor_on_const_xpr")
+
+if (EIGEN_FAILTEST_FAILURE_COUNT)
+  message(FATAL_ERROR "${EIGEN_FAILTEST_FAILURE_COUNT} out of ${EIGEN_FAILTEST_COUNT} failtests FAILED. "
+                      "Failtests succeed when they generate build errors. "
+                      "To debug these failures, manually compile these programs in ${CMAKE_CURRENT_SOURCE_DIR}.")
+else()
+  message(STATUS "Failtest SUCCESS: all ${EIGEN_FAILTEST_COUNT} failtests passed.")
+  message(STATUS "")
+endif()

failtest/block_nonconst_ctor_on_const_xpr_0.cpp

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+#include "../Eigen/Core"
+
+#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
+#define CV_QUALIFIER const
+#else
+#define CV_QUALIFIER
+#endif
+
+using namespace Eigen;
+
+void foo(CV_QUALIFIER Matrix3d &m){
+    Block<Matrix3d,3,3> b(m,0,0);
+}
+
+int main() {}

failtest/block_nonconst_ctor_on_const_xpr_1.cpp

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+#include "../Eigen/Core"
+
+#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
+#define CV_QUALIFIER const
+#else
+#define CV_QUALIFIER
+#endif
+
+using namespace Eigen;
+
+void foo(CV_QUALIFIER Matrix3d &m){
+    Block<Matrix3d> b(m,0,0,3,3);
+}
+
+int main() {}

failtest/block_nonconst_ctor_on_const_xpr_2.cpp

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+#include "../Eigen/Core"
+
+#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
+#define CV_QUALIFIER const
+#else
+#define CV_QUALIFIER
+#endif
+
+using namespace Eigen;
+
+void foo(CV_QUALIFIER Matrix3d &m){
+    // row/column constructor
+    Block<Matrix3d,3,1> b(m,0);
+}
+
+int main() {}

failtest/diagonal_nonconst_ctor_on_const_xpr.cpp

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+#include "../Eigen/Core"
+
+#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
+#define CV_QUALIFIER const
+#else
+#define CV_QUALIFIER
+#endif
+
+using namespace Eigen;
+
+void foo(CV_QUALIFIER Matrix3d &m){
+    Diagonal<Matrix3d> d(m);
+}
+
+int main() {}

failtest/failtest_sanity_check.cpp

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+#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
+This is just some text that won't compile as a C++ file, as a basic sanity check for failtest.
+#else
+int main() {}
+#endif

failtest/transpose_nonconst_ctor_on_const_xpr.cpp

@@ -0,0 +1,15 @@
+#include "../Eigen/Core"
+
+#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
+#define CV_QUALIFIER const
+#else
+#define CV_QUALIFIER
+#endif
+
+using namespace Eigen;
+
+void foo(CV_QUALIFIER Matrix3d &m){
+    Transpose<Matrix3d> t(m);
+}
+
+int main() {}