cleanup: Use target_link_libraries directly in cmake.

Instead of using `target_link_modules`, which does magic that we no
longer need, because we only have 1 library we install, and all binaries
we build link statically because they need access to internal symbols.

CMakeLists.txt

@@ -405,7 +405,12 @@ endif()
 add_module(toxcore ${toxcore_SOURCES})
 
 # Link it to all dependencies.
-target_link_modules(toxcore ${toxcore_LINK_MODULES})
+if(TARGET toxcore_static)
+  target_link_libraries(toxcore_static PRIVATE ${toxcore_LINK_MODULES})
+endif()
+if(TARGET toxcore_shared)
+  target_link_libraries(toxcore_shared PRIVATE ${toxcore_LINK_MODULES})
+endif()
 
 # Make version script (on systems that support it) to limit symbol visibility.
 make_version_script(toxcore ${toxcore_API_HEADERS})
@@ -422,7 +427,11 @@ install_module(toxcore DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/tox)
 
 function(unit_test subdir target)
   add_executable(unit_${target}_test ${subdir}/${target}_test.cc)
-  target_link_modules(unit_${target}_test toxcore)
+  if(TARGET toxcore_static)
+    target_link_libraries(unit_${target}_test PRIVATE toxcore_static)
+  else()
+    target_link_libraries(unit_${target}_test PRIVATE toxcore_shared)
+  endif()
   target_link_libraries(unit_${target}_test PRIVATE GTest::GTest GTest::Main)
   set_target_properties(unit_${target}_test PROPERTIES COMPILE_FLAGS "${TEST_CXX_FLAGS}")
   add_test(NAME ${target} COMMAND ${CROSSCOMPILING_EMULATOR} unit_${target}_test)
@@ -469,7 +478,12 @@ if(DHT_BOOTSTRAP)
   add_executable(DHT_bootstrap
     other/DHT_bootstrap.c
     other/bootstrap_node_packets.c)
-  target_link_modules(DHT_bootstrap toxcore misc_tools)
+  if(TARGET toxcore_static)
+    target_link_libraries(DHT_bootstrap PRIVATE toxcore_static)
+  else()
+    target_link_libraries(DHT_bootstrap PRIVATE toxcore_shared)
+  endif()
+  target_link_libraries(DHT_bootstrap PRIVATE misc_tools)
   install(TARGETS DHT_bootstrap RUNTIME DESTINATION bin)
 endif()
 

auto_tests/CMakeLists.txt

@@ -3,12 +3,21 @@ set(TEST_TIMEOUT_SECONDS "" CACHE STRING "Limit runtime of each test to the numb
 add_library(auto_test_support
   auto_test_support.c
   auto_test_support.h)
-target_link_modules(auto_test_support toxcore misc_tools)
+if(TARGET toxcore_static)
+  target_link_libraries(auto_test_support PRIVATE toxcore_static)
+else()
+  target_link_libraries(auto_test_support PRIVATE toxcore_shared)
+endif()
 
 function(auto_test target)
   if(AUTOTEST AND NOT (MSVC AND ARGV1 STREQUAL "MSVC_DONT_BUILD"))
     add_executable(auto_${target}_test ${target}_test.c)
-    target_link_modules(auto_${target}_test toxcore misc_tools auto_test_support)
+    target_link_libraries(auto_${target}_test PRIVATE misc_tools auto_test_support)
+    if(TARGET toxcore_static)
+      target_link_libraries(auto_${target}_test PRIVATE toxcore_static)
+    else()
+      target_link_libraries(auto_${target}_test PRIVATE toxcore_shared)
+    endif()
     if(NOT ARGV1 STREQUAL "DONT_RUN")
       add_test(NAME ${target} COMMAND ${CROSSCOMPILING_EMULATOR} auto_${target}_test)
       set_tests_properties(${target} PROPERTIES TIMEOUT "${TEST_TIMEOUT_SECONDS}")

cmake/ModulePackage.cmake

@@ -70,7 +70,7 @@ function(add_module lib)
 endfunction()
 
 function(install_module lib)
-  if(ENABLE_SHARED)
+  if(TARGET ${lib}_shared)
     set_target_properties(${lib}_shared PROPERTIES
       VERSION ${SOVERSION}
       SOVERSION ${SOVERSION_MAJOR}
@@ -80,7 +80,7 @@ function(install_module lib)
       LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
       ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
   endif()
-  if(ENABLE_STATIC)
+  if(TARGET ${lib}_static)
     install(TARGETS ${lib}_static
       RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
       LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
@@ -113,59 +113,3 @@ function(install_module lib)
     install(FILES ${header} ${ARGN})
   endforeach()
 endfunction()
-
-function(target_link_modules target)
-  # If the target we're adding dependencies to is a shared library, add it to
-  # the set of targets.
-  if(TARGET ${target}_shared)
-    set(_targets ${_targets} ${target}_shared)
-    # Shared libraries should first try to link against other shared libraries.
-    set(${target}_shared_primary shared)
-    # If that fails (because the shared target doesn't exist), try linking
-    # against the static library. This requires the static library's objects to
-    # be PIC.
-    set(${target}_shared_secondary static)
-  endif()
-  # It can also be a static library at the same time.
-  if(TARGET ${target}_static)
-    set(_targets ${_targets} ${target}_static)
-    # Static libraries aren't actually linked, but their dependencies are
-    # recorded by "linking" them. If we link an executable to a static library,
-    # we want to also link statically against its transitive dependencies.
-    set(${target}_static_primary static)
-    # If a dependency doesn't exist as static library, we link against the
-    # shared one.
-    set(${target}_static_secondary shared)
-  endif()
-  # If it's neither, then it's an executable.
-  if(NOT _targets)
-    set(_targets ${_targets} ${target})
-    # Executables preferably link against static libraries, so they are
-    # standalone and can be shipped without any external dependencies. As a
-    # frame of reference: tests become roughly 600-800K binaries instead of
-    # 50-100K on x86_64 Linux.
-    set(${target}_primary static)
-    set(${target}_secondary shared)
-  endif()
-
-  foreach(dep ${ARGN})
-    foreach(_target ${_targets})
-      if(TARGET ${dep}_${${_target}_primary})
-        target_link_libraries(${_target} PRIVATE ${dep}_${${_target}_primary})
-      elseif(TARGET ${dep}_${${_target}_secondary})
-        target_link_libraries(${_target} PRIVATE ${dep}_${${_target}_secondary})
-      else()
-        # We record the modules linked to this target, so that we can collect
-        # them later when linking a composed module.
-        list(FIND LINK_MODULES ${dep} _index)
-        if(_index EQUAL -1)
-          set(LINK_MODULES ${LINK_MODULES} ${dep})
-        endif()
-
-        target_link_libraries(${_target} PRIVATE ${dep})
-      endif()
-    endforeach()
-  endforeach()
-
-  set(${target}_LINK_MODULES ${${target}_LINK_MODULES} ${LINK_MODULES} PARENT_SCOPE)
-endfunction()

other/bootstrap_daemon/CMakeLists.txt

@@ -19,6 +19,11 @@ add_executable(tox-bootstrapd
   src/tox-bootstrapd.c
   ../bootstrap_node_packets.c
   ../bootstrap_node_packets.h)
-target_link_modules(tox-bootstrapd toxcore ${LIBCONFIG_LIBRARIES})
+target_link_libraries(tox-bootstrapd PRIVATE ${LIBCONFIG_LIBRARIES})
+if(TARGET toxcore_static)
+  target_link_libraries(tox-bootstrapd PRIVATE toxcore_static)
+else()
+  target_link_libraries(tox-bootstrapd PRIVATE toxcore_shared)
+endif()
 install(TARGETS tox-bootstrapd RUNTIME DESTINATION bin)
 install(FILES bash-completion/completions/tox-bootstrapd DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/bash-completion/completions")

other/bootstrap_daemon/docker/tox-bootstrapd.sha256

@@ -1 +1 @@
-1550b285e7d2f85a340fbde449dfbab3d49958794c918aebdb486ffc1b77c68c  /usr/local/bin/tox-bootstrapd
+f0bff9fe04d56543d95a457afd76c618139eef99a4302337c66d07759d108e8b  /usr/local/bin/tox-bootstrapd

other/fun/CMakeLists.txt

@@ -1,30 +1,41 @@
+function target_link_toxcore(target)
+  if(TARGET toxcore_static)
+    target_link_libraries(${target} PRIVATE toxcore_static)
+  else()
+    target_link_libraries(${target} PRIVATE toxcore_shared)
+  endif()
+endfunction()
+
 add_executable(save-generator save-generator.c)
-target_link_modules(save-generator toxcore misc_tools)
+target_link_libraries(save-generator PRIVATE misc_tools)
+target_link_toxcore(save-generator)
 
 add_executable(strkey strkey.c)
-target_link_modules(strkey toxcore ${LIBSODIUM_LIBRARIES})
+target_link_libraries(strkey PRIVATE ${LIBSODIUM_LIBRARIES})
+target_link_toxcore(strkey)
 
 add_executable(create_bootstrap_keys create_bootstrap_keys.c)
-target_link_modules(create_bootstrap_keys ${LIBSODIUM_LIBRARIES})
+target_link_libraries(create_bootstrap_keys PRIVATE ${LIBSODIUM_LIBRARIES})
+target_link_toxcore(create_bootstrap_keys)
 
 add_executable(create_minimal_savedata create_minimal_savedata.c)
-target_link_modules(create_minimal_savedata ${LIBSODIUM_LIBRARIES})
+target_link_libraries(create_minimal_savedata PRIVATE ${LIBSODIUM_LIBRARIES})
 
 add_executable(create_savedata create_savedata.c)
-target_link_modules(create_savedata toxcore ${LIBSODIUM_LIBRARIES})
+target_link_libraries(create_savedata PRIVATE ${LIBSODIUM_LIBRARIES})
+target_link_toxcore(create_savedata)
 
 add_executable(sign sign.c)
-target_link_modules(sign ${LIBSODIUM_LIBRARIES} misc_tools)
+target_link_libraries(sign PRIVATE ${LIBSODIUM_LIBRARIES} misc_tools)
 
 add_executable(cracker_simple cracker_simple.c)
-target_link_modules(cracker_simple ${LIBSODIUM_LIBRARIES} misc_tools)
+target_link_libraries(cracker_simple ${LIBSODIUM_LIBRARIES} misc_tools)
 
 # MSVC doesn't support OpenMP
 if(NOT MSVC)
   find_package(OpenMP)
   if(OpenMP_C_FOUND)
     add_executable(cracker cracker.c)
-    target_link_modules(cracker ${LIBSODIUM_LIBRARIES})
-    target_link_libraries(cracker PRIVATE OpenMP::OpenMP_C)
+    target_link_libraries(cracker PRIVATE OpenMP::OpenMP_C ${LIBSODIUM_LIBRARIES})
   endif()
 endif()

testing/CMakeLists.txt

@@ -3,7 +3,11 @@ set(misc_tools_SOURCES
   misc_tools.c
   misc_tools.h)
 add_library(misc_tools STATIC ${misc_tools_SOURCES})
-target_link_modules(misc_tools toxcore)
+if(TARGET toxcore_static)
+  target_link_libraries(misc_tools PRIVATE toxcore_static)
+else()
+  target_link_libraries(misc_tools PRIVATE toxcore_shared)
+endif()
 
 ################################################################################
 #
@@ -13,5 +17,10 @@ target_link_modules(misc_tools toxcore)
 
 if(BUILD_MISC_TESTS)
   add_executable(Messenger_test Messenger_test.c)
-  target_link_modules(Messenger_test toxcore misc_tools)
+  target_link_libraries(Messenger_test misc_tools)
+  if(TARGET toxcore_static)
+    target_link_libraries(Messenger_test PRIVATE toxcore_static)
+  else()
+    target_link_libraries(Messenger_test PRIVATE toxcore_shared)
+  endif()
 endif()