Add eigen3 to target_link_libraries of M2-interpreter to fix a compile issue

Author: jkyang92

M2/Macaulay2/d/CMakeLists.txt

@@ -151,6 +151,11 @@ target_link_libraries(M2-interpreter PRIVATE M2-supervisor
   $<$<BOOL:${WITH_TBB}>:TBB::tbb>
   $<$<BOOL:${WITH_FFI}>:FFI::ffi>)
 
+if(EIGEN3_FOUND)
+  #version.d is using an Eigen header it can't find without this line
+  target_link_libraries(M2-interpreter PRIVATE Eigen3::Eigen)
+endif()
+
 # TODO: c.f. https://github.com/Macaulay2/M2/issues/2682
 if(NOT APPLE)
   target_link_libraries(M2-interpreter PRIVATE quadmath)

M2/cmake/check-libraries.cmake

@@ -127,13 +127,16 @@ find_package(GMP	6.0.0 REQUIRED)
 #   givaro	prime field and algebraic computations	(needs gmp)
 #  fflas_ffpack	Finite Field Linear Algebra Routines	(needs gmp, givaro + LAPACK)
 
-find_package(Eigen3	3.4...5.0 PATHS ${M2_HOST_PREFIX})
-# FindEigen3 doesn't set EIGEN3_FOUND, and instead we should check
-# if the target Eigen3::Eigen is defined, so we set EIGEN3_FOUND
-# for compatibility with the rest of the build code
-if(TARGET Eigen3::Eigen)
-  set(EIGEN3_FOUND TRUE)
-endif (TARGET Eigen3::Eigen)
+find_package(Eigen3	3.4.0 PATHS ${M2_HOST_PREFIX})
+if(NOT EIGEN3_FOUND)
+  find_package(Eigen3	3.4.1...5.0 PATHS ${M2_HOST_PREFIX})
+  # FindEigen3 doesn't set EIGEN3_FOUND, and instead we should check
+  # if the target Eigen3::Eigen is defined, so we set EIGEN3_FOUND
+  # for compatibility with the rest of the build code
+  if(TARGET Eigen3::Eigen)
+    set(EIGEN3_FOUND TRUE)
+  endif()
+endif()
 find_package(BDWGC	7.6.4)
 find_package(MPFR	4.0.1)
 find_package(MPFI	1.5.1)