cctag: Fix Darwin build

Fix the Darwin build by removing the dependency on the math_c99
libraries which aren't required on Darwin.
Also re-enable tests on Darwin by fixing the linking issue.

Co-authored-by: Reno Dakota <paparodeo@proton.me>

pkgs/development/libraries/cctag/cmake-no-apple-rpath.patch

@@ -0,0 +1,26 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index d0e35b6..fc19477 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -96,20 +96,6 @@ endif()
+ # set the path where we can find the findXXX.cmake
+ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake")
+ 
+-if(APPLE)
+-
+-  # avoid the cmake policy warning about @rpath in MacOSX
+-  cmake_policy(SET CMP0042 NEW)
+-
+-  SET(CMAKE_MACOSX_RPATH TRUE) # initialize the MACOSX_RPATH property on all targets
+-  SET(CMAKE_SKIP_BUILD_RPATH  FALSE) # don't skip the full RPATH for the build tree
+-  # SET(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE) # when building, don't use the install RPATH already
+-  SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE) # when building, use the install RPATH already
+-                                           # probably not needed
+-  # SET(CMAKE_INSTALL_RPATH "") # the RPATH to be used when installing
+-  SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE) # LC_RPATH for CUDA and OpenCV etc written into executable
+-endif(APPLE)
+-
+ # FIND BOOST
+ set(BOOST_REQUIRED_COMPONENTS "atomic;chrono;date_time;filesystem;program_options;serialization;system;thread;timer;math_c99")
+ if(WIN32)
+

pkgs/development/libraries/cctag/default.nix

@@ -17,9 +17,8 @@ stdenv.mkDerivation rec {
   version = "1.0.4";
 
   outputs = [
-    "lib"
-    "dev"
     "out"
+    "dev"
   ];
 
   src = fetchFromGitHub {
@@ -41,8 +40,15 @@ stdenv.mkDerivation rec {
 
   patches = [
     ./cmake-install-include-dir.patch
+    ./cmake-no-apple-rpath.patch
   ];
 
+  # darwin boost doesn't have math_c99 libraries
+  postPatch = lib.optionalString stdenv.hostPlatform.isDarwin ''
+    substituteInPlace CMakeLists.txt --replace-warn ";math_c99" ""
+    substituteInPlace src/CMakeLists.txt --replace-warn "Boost::math_c99" ""
+  '';
+
   nativeBuildInputs = [
     cmake
   ];
@@ -57,8 +63,7 @@ stdenv.mkDerivation rec {
     opencv.cxxdev
   ];
 
-  # Tests are broken on Darwin (linking issue)
-  doCheck = !stdenv.hostPlatform.isDarwin;
+  doCheck = true;
 
   meta = with lib; {
     description = "Detection of CCTag markers made up of concentric circles";