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Using BUILD_SHARED_LIBS=OFF does not enforce using libmpfr.a and libgmp.a #2466

Closed redantlabs closed 7 years ago

redantlabs commented 7 years ago

Hello

Issue Details

I am using the CGAL library as a third part component of a library. To compile my executables in static mode (no shared library), I need to build CGAL in static mode

I am building CGAL in header-only mode and I do the following :

cmake . -DCGAL_HEADER_ONLY=ON -DBUILD_SHARED_LIBS=OFF

However, the configuration links to the libraries libmpfr.so and libgmp.so rather than libmpfr.a and libgmp.a

I can work around by setting in addition the path to the libraries :

cmake . -DCGAL_HEADER_ONLY=ON -DBUILD_SHARED_LIBS=OFF -DMPFR_LIBRARIES=/use<path/to/libmpfr.a> -DGMP_LIBRARIES=<path/to/libgmp.a>

Environment

Thank you, Tom.

lrineau commented 7 years ago

That is not a bug, but a misuse of CMake. If you want to link against libmpfr.a and libgmp.a then set the CMake variables GMP_LIBRARIES and MPFR_LIBRARIES accordingly in the CMake cache.

Anyway, if you use CGAL_HEADER_ONLY=ON, then there is no longer any CGAL library, and it is neither shared nor static.

sloriot commented 7 years ago

The doc is ambiguous and must probably fixed. Here we have: "These setting affect the variants of third-party libraries (see next section) selected whenever the choice is available."

lrineau commented 7 years ago

These setting affect the variants of third-party libraries (see next section) selected whenever the choice is available.

That sentence is true for Boost libraries, because FindBoost..cmake has a variable Boost_USE_STATIC_LIBS that can be used, but CMake does not provide any way to restrict find_library to static libraries.

sloriot commented 7 years ago

You mean that in "the choice is available" the choice means "supported by FindFooBar.cmake" and not that "the static lib"?

lrineau commented 7 years ago

Right. And in practice, that variable only affects the variant of Boost libraries.

We should remove the sentence from the manual, because it is wrong.

lrineau commented 7 years ago

The doc bug has been fixed in the branch targeting CGAL-4.11.1, by the PR #2476.

raphaelsulzer commented 3 years ago

Hi,

I am struggling with the same problem.

cmake . -DCGAL_HEADER_ONLY=ON -DBUILD_SHARED_LIBS=OFF -DMPFR_LIBRARIES=/use<path/to/libmpfr.a> -DGMP_LIBRARIES=<path/to/libgmp.a>

I generate CGAL (5.1.1) with the command above and I can see that it links to the static libraries of gmp and mpfr. However, when I try to build my own project I always get the following error:

/usr/lib/x86_64-linux-gnu/libmpfr.a(mpfr-gmp.o): In function `mpfr_tmp_allocate':
(.text+0x3b): undefined reference to `__gmp_get_memory_functions'
(.text+0x54): undefined reference to `__gmp_get_memory_functions'
/usr/lib/x86_64-linux-gnu/libmpfr.a(mpfr-gmp.o): In function `mpfr_tmp_free':
(.text+0xe9): undefined reference to `__gmp_get_memory_functions'
(.text+0x105): undefined reference to `__gmp_get_memory_functions'
/usr/lib/x86_64-linux-gnu/libmpfr.a(mpfr-gmp.o): In function `mpfr_allocate_func':
(.text.hot+0x26): undefined reference to `__gmp_get_memory_functions'
/usr/lib/x86_64-linux-gnu/libmpfr.a(mpfr-gmp.o):(.text.hot+0x7f): more undefined references to `__gmp_get_memory_functions' follow
/usr/lib/x86_64-linux-gnu/libmpfr.a(div.o): In function `mpfr_div':
(.text.hot+0x2e1): undefined reference to `__gmpn_divrem'
(.text.hot+0x551): undefined reference to `__gmpz_sizeinbase'
(.text.hot+0x58d): undefined reference to `__gmpz_sizeinbase'
(.text.hot+0x5d4): undefined reference to `__gmpz_tdiv_q'
(.text.hot+0x5e1): undefined reference to `__gmpz_sizeinbase'
(.text.hot+0x601): undefined reference to `__gmpz_scan1'
(.text.hot+0x644): undefined reference to `__gmpz_scan0'
(.text.hot+0x137f): undefined reference to `__gmpz_mul_2exp'
/usr/lib/x86_64-linux-gnu/libmpfr.a(pool.o): In function `mpfr_free_pool':
(.text+0x33): undefined reference to `__gmpz_clear'
/usr/lib/x86_64-linux-gnu/libmpfr.a(pool.o): In function `mpfr_mpz_init':
(.text.hot+0x39): undefined reference to `__gmpz_init'
/usr/lib/x86_64-linux-gnu/libmpfr.a(pool.o): In function `mpfr_mpz_init2':
(.text.hot+0x81): undefined reference to `__gmpz_init2'
/usr/lib/x86_64-linux-gnu/libmpfr.a(pool.o): In function `mpfr_mpz_clear':
(.text.hot+0xc9): undefined reference to `__gmpz_clear'
/usr/lib/x86_64-linux-gnu/libmpfr.a(round_prec.o): In function `mpfr_round_raw':
(.text+0x426): undefined reference to `__gmpn_copyd'
/usr/lib/x86_64-linux-gnu/libmpfr.a(round_prec.o): In function `mpfr_round_raw_4':
(.text+0xd3d): undefined reference to `__gmpn_copyd'
/usr/lib/x86_64-linux-gnu/libmpfr.a(round_prec.o): In function `mpfr_prec_round':
(.text+0x1776): undefined reference to `__gmpn_copyd'
/usr/lib/x86_64-linux-gnu/libmpfr.a(get_z_exp.o): In function `mpfr_get_z_2exp':
(.text+0x45): undefined reference to `__gmpz_realloc2'
(.text+0xaf): undefined reference to `__gmpz_set_ui'
/usr/lib/x86_64-linux-gnu/libmpfr.a(mulders.o): In function `mpfr_divhigh_n':
(.text+0x49d): undefined reference to `__gmpn_divrem'
(.text+0x85e): undefined reference to `__gmpn_divrem'
collect2: error: ld returned 1 exit status
CMakeFiles/sure.dir/build.make:137: recipe for target 'sure' failed
make[2]: *** [sure] Error 1
CMakeFiles/Makefile2:243: recipe for target 'CMakeFiles/sure.dir/all' failed
make[1]: *** [CMakeFiles/sure.dir/all] Error 2
Makefile:102: recipe for target 'all' failed
make: *** [all] Error 2

That is not a bug, but a misuse of CMake. If you want to link against libmpfr.a and libgmp.a then set the CMake variables GMP_LIBRARIES and MPFR_LIBRARIES accordingly in the CMake cache.

Anyway, if you use CGAL_HEADER_ONLY=ON, then there is no longer any CGAL library, and it is neither shared nor static.

I also tried this but did not succeed.

How exactly could I statically compile a program that uses CGAL?

lrineau commented 3 years ago

I generate CGAL (5.1.1) with the command above and I can see that it links to the static libraries of gmp and mpfr. However, when I try to build my own project I always get the following error: [...]

Can you please copy-paste the compiler/linker command line that creates that error. It seems the GMP and MPFR libraries are not ordered correctly, when linked statically.

raphaelsulzer commented 3 years ago

Of CGAL:

cmake .. -DCGAL_HEADER_ONLY=ON -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DMPFR_LIBRARIES=/usr/lib/x86_64-linux-gnu/libmpfr.a -DGMP_LIBRARIES=/usr/lib/x86_64-linux-gnu/libgmp.a -DGMPXX_LIBRARIES=/usr/lib/x86_64-linux-gnu/libgmpxx.a
== CMake setup ==
-- The CXX compiler identification is GNU 7.5.0
-- The C compiler identification is GNU 7.5.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
== CMake setup (DONE) ==

== Setting paths ==
-- Build CGAL from n/a-branch: n/a
-- Removed not-a-package: .gitattributes;.github;.gitignore;.travis;.travis.yml;CGALConfig.cmake;CGALConfigVersion.cmake;Documentation;INSTALL.md;LICENSE.md;Miscellany;README.md;build;build_static;ccpp.yml;cmake_uninstall.cmake.in
-- Installation package directory: /home/adminlocal/PhD/cpp/cgal-5.1.1/Installation
-- Maintenance package directory: /home/adminlocal/PhD/cpp/cgal-5.1.1/Maintenance
-- Core package directory: /home/adminlocal/PhD/cpp/cgal-5.1.1/Core
-- Packagenames: AABB_tree;Advancing_front_surface_reconstruction;Algebraic_foundations;Algebraic_kernel_d;Algebraic_kernel_for_circles;Algebraic_kernel_for_spheres;Alpha_shapes_2;Alpha_shapes_3;Apollonius_graph_2;Arithmetic_kernel;Arrangement_on_surface_2;BGL;Barycentric_coordinates_2;Boolean_set_operations_2;Bounding_volumes;Box_intersection_d;CGAL_Core;CGAL_ImageIO;CGAL_ipelets;Cartesian_kernel;Circular_kernel_2;Circular_kernel_3;Circulator;Classification;Combinatorial_map;Cone_spanners_2;Convex_decomposition_3;Convex_hull_2;Convex_hull_3;Convex_hull_d;Distance_2;Distance_3;Envelope_2;Envelope_3;Filtered_kernel;Generalized_map;Generator;Geomview;GraphicsView;HalfedgeDS;Hash_map;Heat_method_3;Homogeneous_kernel;Hyperbolic_triangulation_2;Inscribed_areas;Installation;Interpolation;Intersections_2;Intersections_3;Interval_skip_list;Interval_support;Inventor;Jet_fitting_3;Kernel_23;Kernel_d;LEDA;Linear_cell_complex;MacOSX;Maintenance;Matrix_search;Mesh_2;Mesh_3;Mesher_level;Minkowski_sum_2;Minkowski_sum_3;Modifier;Modular_arithmetic;Nef_2;Nef_3;Nef_S2;NewKernel_d;Number_types;OpenNL;Optimal_bounding_box;Optimal_transportation_reconstruction_2;Optimisation_basic;Partition_2;Periodic_2_triangulation_2;Periodic_3_mesh_3;Periodic_3_triangulation_3;Periodic_4_hyperbolic_triangulation_2;Point_set_2;Point_set_3;Point_set_processing_3;Poisson_surface_reconstruction_3;Polygon;Polygon_mesh_processing;Polygonal_surface_reconstruction;Polyhedron;Polyhedron_IO;Polyline_simplification_2;Polynomial;Polytope_distance_d;Principal_component_analysis;Principal_component_analysis_LGPL;Profiling_tools;Property_map;QP_solver;Random_numbers;Ridges_3;STL_Extension;Scale_space_reconstruction_3;Scripts;SearchStructures;Segment_Delaunay_graph_2;Segment_Delaunay_graph_Linf_2;Set_movable_separability_2;Shape_detection;Skin_surface_3;Snap_rounding_2;Solver_interface;Spatial_searching;Spatial_sorting;Straight_skeleton_2;Stream_lines_2;Stream_support;Subdivision_method_3;Surface_mesh;Surface_mesh_approximation;Surface_mesh_deformation;Surface_mesh_parameterization;Surface_mesh_segmentation;Surface_mesh_shortest_path;Surface_mesh_simplification;Surface_mesh_skeletonization;Surface_mesh_topology;Surface_mesher;Surface_sweep_2;TDS_2;TDS_3;Testsuite;Tetrahedral_remeshing;Three;Triangulation;Triangulation_2;Triangulation_3;Union_find;Visibility_2;Voronoi_diagram_2;wininst
== Setting paths (DONE) ==

== Generate version files ==
-- CGAL_VERSION is 5.1.1-I-900
-- CGAL_VERSION_NR is 1050110900
-- CGAL_GIT_HASH is 
-- CGAL_CREATED_SVN_REVISION is 99999 (dummy)
-- CGAL_MAJOR_VERSION=5
-- CGAL_MINOR_VERSION=1
-- CGAL_BUGFIX_VERSION=1
-- CGAL_BUILD_VERSION=900
-- CGAL_SONAME_VERSION=13
-- CGAL_SOVERSION     =13.0.3
-- Building static libraries
-- Targetting Unix Makefiles
-- Using /usr/bin/c++ compiler.
-- USING CMake version: 3.18.0
-- System: Linux
-- USING GCC_VERSION = '7.5.0'
-- Using gcc version 4 or later. Adding -frounding-math
== Generate version files (DONE) ==

-- Build type: Release
-- USING CXXFLAGS = ' -O3 -DNDEBUG'
-- USING LDFLAGS = ' '
== Detect external libraries ==
== Detect external libraries (DONE) ==

== Generating build files ==
Configuring libCGAL
-- Found GMP: /usr/lib/x86_64-linux-gnu/libgmp.a  
-- Found MPFR: /usr/lib/x86_64-linux-gnu/libmpfr.a  
-- Found Boost: /usr/include (found suitable version "1.65.1", minimum required is "1.48")  
-- Boost include dirs: /usr/include
-- Boost libraries:    
-- Using gcc version 4 or later. Adding -frounding-math
-- USING GMP_VERSION = '6.1.2'
-- USING MPFR_VERSION = '4.0.1'
-- USING BOOST_VERSION = '1.65.1'
libCGAL is configured
-- Sources for CGAL component library 'CGAL_Core' detected
Configuring libCGAL_Core
libCGAL_Core is configured
-- Sources for CGAL component library 'CGAL_ImageIO' detected
Configuring libCGAL_ImageIO
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11") 
-- USING ZLIB_VERSION = '1.2.11'
libCGAL_ImageIO is configured
-- Sources for CGAL component library 'CGAL_Qt5' detected
Configuring libCGAL_Qt5
-- libCGAL_Qt5 is missing the dependencies:  Qt5Svg Qt5 cannot be configured.
-- Sources for CGAL component libraries 'CGAL_Core;CGAL_ImageIO;CGAL_Qt5' detected
== Generating build files (DONE) ==

-- Configuring done
-- Generating done
-- Build files have been written to: /home/adminlocal/PhD/cpp/cgal-5.1.1/build

My code:

-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- cmake location: /usr/local
-- used compiler: GNU
-- used compiler version: 7.5.0
-- Build type not specified, using Debug
-- Found GCO
--   Includes : /usr/local/include/gco-v3.0
--   Libraries : /usr/local/lib/libgco.a
-- Performing Test arch_native_supported
-- Performing Test arch_native_supported - Success
-- Eigen 3.3.4 found (include: /usr/include/eigen3)
-- Found OpenMP_C: -fopenmp (found version "4.5") 
-- Found OpenMP_CXX: -fopenmp (found version "4.5") 
-- Found OpenMP: TRUE (found version "4.5")  
-- Enabling OpenMP support
-- Disabling CUDA support
-- Using header-only CGAL
-- Found GMP: /usr/lib/x86_64-linux-gnu/libgmp.a;/usr/lib/x86_64-linux-gnu/libgmpxx.a
-- Found MPFR: /usr/include (Required is at least version "1.0.0") 
-- Found MPFR: /usr/lib/x86_64-linux-gnu/libmpfr.a
-- Found Boost: /usr/include (found suitable version "1.65.1", minimum required is "1.48")  
-- Boost include dirs: /usr/include
-- Boost libraries:    
-- Using gcc version 4 or later. Adding -frounding-math
-- Found CGAL 5.1.1
--   Includes : /usr/local/include
--   Libraries : 
-- Found Boost: /usr/include (found version "1.65.1") found components: iostreams program_options system serialization filesystem regex 
-- Configuring done
-- Generating done
-- Build files have been written to: /home/adminlocal/PhD/cpp/surfaceReconstruction/build/release
lrineau commented 3 years ago

Of CGAL:

cmake .. -DCGAL_HEADER_ONLY=ON -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DMPFR_LIBRARIES=/usr/lib/x86_64-linux-gnu/libmpfr.a -DGMP_LIBRARIES=/usr/lib/x86_64-linux-gnu/libgmp.a -DGMPXX_LIBRARIES=/usr/lib/x86_64-linux-gnu/libgmpxx.a

That is the CMake command line. I would like you use make VERBOSE=1 so that make displays the command lines it uses for the compiler. And I would like to see the linker command line that triggers the link error.

raphaelsulzer commented 3 years ago 
[ 96%] Building CXX object CMakeFiles/sure.dir/src/exe/sure.cpp.o
/usr/bin/c++ -DCGAL_USE_GMPXX=1 -DEIGEN_INITIALIZE_MATRICES_BY_NAN -DUNIX -I/home/adminlocal/PhD/cpp/surfaceReconstruction/src -I/home/adminlocal/PhD/cpp/surfaceReconstruction/external -I/usr/include/eigen3 -I/usr/local/include/gco-v3.0 -g   -O3 -Wno-deprecated-declarations -Wno-unused-result -Wno-all -Wno-attributes -Wno-enum-compare -Wno-delete-incomplete -frounding-math -fopenmp -o CMakeFiles/sure.dir/src/exe/sure.cpp.o -c /home/adminlocal/PhD/cpp/surfaceReconstruction/src/exe/sure.cpp
[100%] Linking CXX executable sure
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/sure.dir/link.txt --verbose=1
/usr/bin/c++ -g -static CMakeFiles/sure.dir/src/exe/sure.cpp.o CMakeFiles/sure.dir/src/exe/inputParser.cpp.o -o sure  libfileIO.a liblearning.a librPLY.a libutil.a libprocessing.a /usr/lib/x86_64-linux-gnu/libboost_iostreams.a /usr/lib/x86_64-linux-gnu/libboost_program_options.a /usr/lib/x86_64-linux-gnu/libboost_system.a /usr/lib/x86_64-linux-gnu/libboost_serialization.a /usr/lib/x86_64-linux-gnu/libboost_filesystem.a /usr/lib/x86_64-linux-gnu/libboost_regex.a -ldl /usr/local/lib/libgco.a /usr/lib/x86_64-linux-gnu/libgmp.a /usr/lib/x86_64-linux-gnu/libgmpxx.a /usr/lib/x86_64-linux-gnu/libgmpxx.a /usr/lib/x86_64-linux-gnu/libmpfr.a /usr/lib/gcc/x86_64-linux-gnu/7/libgomp.a /usr/lib/x86_64-linux-gnu/libdl.a /usr/lib/x86_64-linux-gnu/libpthread.a /usr/lib/x86_64-linux-gnu/libz.a 
/usr/lib/x86_64-linux-gnu/libmpfr.a(mpfr-gmp.o): In function `mpfr_tmp_allocate':
(.text+0x3b): undefined reference to `__gmp_get_memory_functions'
(.text+0x54): undefined reference to `__gmp_get_memory_functions'
/usr/lib/x86_64-linux-gnu/libmpfr.a(mpfr-gmp.o): In function `mpfr_tmp_free':
(.text+0xe9): undefined reference to `__gmp_get_memory_functions'
(.text+0x105): undefined reference to `__gmp_get_memory_functions'
/usr/lib/x86_64-linux-gnu/libmpfr.a(mpfr-gmp.o): In function `mpfr_allocate_func':
(.text.hot+0x26): undefined reference to `__gmp_get_memory_functions'
/usr/lib/x86_64-linux-gnu/libmpfr.a(mpfr-gmp.o):(.text.hot+0x7f): more undefined references to `__gmp_get_memory_functions' follow
/usr/lib/x86_64-linux-gnu/libmpfr.a(div.o): In function `mpfr_div':
(.text.hot+0x2e1): undefined reference to `__gmpn_divrem'
(.text.hot+0x551): undefined reference to `__gmpz_sizeinbase'
(.text.hot+0x58d): undefined reference to `__gmpz_sizeinbase'
(.text.hot+0x5d4): undefined reference to `__gmpz_tdiv_q'
(.text.hot+0x5e1): undefined reference to `__gmpz_sizeinbase'
(.text.hot+0x601): undefined reference to `__gmpz_scan1'
(.text.hot+0x644): undefined reference to `__gmpz_scan0'
(.text.hot+0x137f): undefined reference to `__gmpz_mul_2exp'
/usr/lib/x86_64-linux-gnu/libmpfr.a(pool.o): In function `mpfr_free_pool':
(.text+0x33): undefined reference to `__gmpz_clear'
/usr/lib/x86_64-linux-gnu/libmpfr.a(pool.o): In function `mpfr_mpz_init':
(.text.hot+0x39): undefined reference to `__gmpz_init'
/usr/lib/x86_64-linux-gnu/libmpfr.a(pool.o): In function `mpfr_mpz_init2':
(.text.hot+0x81): undefined reference to `__gmpz_init2'
/usr/lib/x86_64-linux-gnu/libmpfr.a(pool.o): In function `mpfr_mpz_clear':
(.text.hot+0xc9): undefined reference to `__gmpz_clear'
/usr/lib/x86_64-linux-gnu/libmpfr.a(round_prec.o): In function `mpfr_round_raw':
(.text+0x426): undefined reference to `__gmpn_copyd'
/usr/lib/x86_64-linux-gnu/libmpfr.a(round_prec.o): In function `mpfr_round_raw_4':
(.text+0xd3d): undefined reference to `__gmpn_copyd'
/usr/lib/x86_64-linux-gnu/libmpfr.a(round_prec.o): In function `mpfr_prec_round':
(.text+0x1776): undefined reference to `__gmpn_copyd'
/usr/lib/x86_64-linux-gnu/libmpfr.a(get_z_exp.o): In function `mpfr_get_z_2exp':
(.text+0x45): undefined reference to `__gmpz_realloc2'
(.text+0xaf): undefined reference to `__gmpz_set_ui'
/usr/lib/x86_64-linux-gnu/libmpfr.a(mulders.o): In function `mpfr_divhigh_n':
(.text+0x49d): undefined reference to `__gmpn_divrem'
(.text+0x85e): undefined reference to `__gmpn_divrem'
collect2: error: ld returned 1 exit status
CMakeFiles/sure.dir/build.make:137: recipe for target 'sure' failed
make[2]: *** [sure] Error 1
make[2]: Leaving directory '/home/adminlocal/PhD/cpp/surfaceReconstruction/build/release'
CMakeFiles/Makefile2:243: recipe for target 'CMakeFiles/sure.dir/all' failed
make[1]: *** [CMakeFiles/sure.dir/all] Error 2
make[1]: Leaving directory '/home/adminlocal/PhD/cpp/surfaceReconstruction/build/release'
Makefile:102: recipe for target 'all' failed
make: *** [all] Error 2
lrineau commented 3 years ago

@raphaelsulzer In my opinion you issue is not related to the subject of this issue.

Earlier in the discussion, https://github.com/CGAL/cgal/issues/2466#issuecomment-768257442, you pasted:

-- Using header-only CGAL
-- Found GMP: /usr/lib/x86_64-linux-gnu/libgmp.a;/usr/lib/x86_64-linux-gnu/libgmpxx.a
-- Found MPFR: /usr/include (Required is at least version "1.0.0") 
-- Found MPFR: /usr/lib/x86_64-linux-gnu/libmpfr.a
-- Found Boost: /usr/include (found suitable version "1.65.1", minimum required is "1.48")  
-- Boost include dirs: /usr/include
-- Boost libraries:    
-- Using gcc version 4 or later. Adding -frounding-math
-- Found CGAL 5.1.1

and I do not really understand what CMake code displayed that, in particulat the part about MPFR:

-- Found MPFR: /usr/include (Required is at least version "1.0.0")

What would require version "1.0.0" for MPFR? I doubt the CMake code comes from CGAL.

raphaelsulzer commented 3 years ago

You are right! It was coming from a FindMPFR.cmake which I had accidentally included.

Everything works now.

Thank you very much for helping me tracking it down.