Genex: Add $<LINK_LANGUAGE:...> and $<LINK_LANG_AND_ID:...>

This MR may help to solve issues #19757 and #18008

Fixes: #19965

22 files changed, 287 insertions, 0 deletions

diff --git a/Tests/RunCMake/target_link_libraries/RunCMakeTest.cmake b/Tests/RunCMake/target_link_libraries/RunCMakeTest.cmake
index 0152d4c..c7feb5f 100644
--- a/Tests/RunCMake/target_link_libraries/RunCMakeTest.cmake
+++ b/Tests/RunCMake/target_link_libraries/RunCMakeTest.cmake
@@ -20,3 +20,57 @@ run_cmake(StaticPrivateDepNotExported)
 run_cmake(StaticPrivateDepNotTarget)
 run_cmake(UNKNOWN-IMPORTED-GLOBAL)
 run_cmake(empty_keyword_args)
+run_cmake(genex_LINK_LANGUAGE-bad-usage)
+
+if (RunCMake_GENERATOR MATCHES "Makefiles|Ninja|Visual Studio|Xcode|Watcom WMake")
+
+  run_cmake(genex_LINK_LANGUAGE-bad-mix-lang)
+  run_cmake(genex_LINK_LANG_AND_ID-bad-mix-lang)
+
+  macro(run_cmake_target test subtest target)
+    set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${test}-build)
+    set(RunCMake_TEST_NO_CLEAN 1)
+    run_cmake_command(${test}-${subtest} ${CMAKE_COMMAND} --build . --target ${target} ${ARGN})
+
+    unset(RunCMake_TEST_BINARY_DIR)
+    unset(RunCMake_TEST_NO_CLEAN)
+  endmacro()
+
+  set(RunCMake_TEST_OUTPUT_MERGE TRUE)
+  if (NOT RunCMake_GENERATOR_IS_MULTI_CONFIG)
+    set(RunCMake_TEST_OPTIONS -DCMAKE_BUILD_TYPE=Release)
+  endif()
+
+  run_cmake(genex_LINK_LANGUAGE)
+
+  run_cmake_target(genex_LINK_LANGUAGE lib LinkLibraries_lib --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE lib2 LinkLibraries_lib2 --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE lib3 LinkLibraries_lib3 --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE exe LinkLibraries_exe --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE C_import LinkLibraries_C_import --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE CXX_import LinkLibraries_CXX_import --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE C_interface LinkLibraries_C_interface --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE CXX_interface LinkLibraries_CXX_interface --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE C_interface2 LinkLibraries_C_interface2 --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE CXX_interface2 LinkLibraries_CXX_interface2 --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE C_static LinkLibraries_C_static --config Release)
+  run_cmake_target(genex_LINK_LANGUAGE CXX_static LinkLibraries_CXX_static --config Release)
+
+  run_cmake(genex_LINK_LANG_AND_ID)
+
+  run_cmake_target(genex_LINK_LANG_AND_ID lib LinkLibraries_lib --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID lib2 LinkLibraries_lib2 --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID lib3 LinkLibraries_lib3 --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID exe LinkLibraries_exe --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID C_import LinkLibraries_C_import --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID CXX_import LinkLibraries_CXX_import --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID C_interface LinkLibraries_C_interface --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID CXX_interface LinkLibraries_CXX_interface --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID C_interface2 LinkLibraries_C_interface2 --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID CXX_interface2 LinkLibraries_CXX_interface2 --config Release)
+  run_cmake_target(genex_LINK_LANG_AND_ID CXX_static LinkLibraries_CXX_static --config Release)
+
+  unset(RunCMake_TEST_OPTIONS)
+  unset(RunCMake_TEST_OUTPUT_MERGE)
+
+endif()
diff --git a/Tests/RunCMake/target_link_libraries/func.c b/Tests/RunCMake/target_link_libraries/func.c
new file mode 100644
index 0000000..415a9bf
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/func.c
@@ -0,0 +1,7 @@
+
+#if defined(_WIN32)
+__declspec(dllexport)
+#endif
+  void func_c()
+{
+}
diff --git a/Tests/RunCMake/target_link_libraries/func.cxx b/Tests/RunCMake/target_link_libraries/func.cxx
new file mode 100644
index 0000000..a12caca
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/func.cxx
@@ -0,0 +1,7 @@
+
+#if defined(_WIN32)
+__declspec(dllexport)
+#endif
+  void func_cxx()
+{
+}
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang-result.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang-stderr.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang-stderr.txt
new file mode 100644
index 0000000..2ecdc0c
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang-stderr.txt
@@ -0,0 +1,2 @@
+CMake Error: Evaluation of \$<LINK_LANGUAGE:...> or \$<LINK_LAND_AND_ID:...> changes
+the linker language for target "LinkLibraries_bad_mix_languages" \(from 'C' to 'CXX'\) which is invalid.
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang.cmake b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang.cmake
new file mode 100644
index 0000000..e8efa75
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-mix-lang.cmake
@@ -0,0 +1,8 @@
+
+enable_language(C)
+enable_language(CXX)
+
+add_library(static_CXX STATIC func.cxx)
+
+add_executable(LinkLibraries_bad_mix_languages main.c)
+target_link_libraries (LinkLibraries_bad_mix_languages PRIVATE $<$<LINK_LANGUAGE:C>:static_CXX>)
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage-result.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage-stderr.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage-stderr.txt
new file mode 100644
index 0000000..469f1fe
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage-stderr.txt
@@ -0,0 +1,8 @@
+CMake Error at genex_LINK_LANGUAGE-bad-usage.cmake:4 \(target_link_libraries\):
+  Error evaluating generator expression:
+
+    \$<LINK_LANGUAGE>
+
+  \$<LINK_LANGUAGE> is not supported in link libraries expression.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage.cmake b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage.cmake
new file mode 100644
index 0000000..81cfb0c
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE-bad-usage.cmake
@@ -0,0 +1,4 @@
+enable_language(C)
+
+add_library(simple SHARED empty.c)
+target_link_libraries(simple PRIVATE lib$<LINK_LANGUAGE>)
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE.cmake b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE.cmake
new file mode 100644
index 0000000..f3fe955
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANGUAGE.cmake
@@ -0,0 +1,72 @@
+
+cmake_minimum_required(VERSION 3.16...3.17)
+
+enable_language(C)
+enable_language(CXX)
+
+add_library(shared_C SHARED func.c)
+add_library(shared_CXX SHARED func.cxx)
+
+
+add_library(static1_C STATIC empty.c)
+target_link_libraries (static1_C INTERFACE $<$<LINK_LANGUAGE:C>:shared_C>)
+
+add_library(static2_C STATIC empty.c)
+target_link_libraries (static2_C PRIVATE $<$<LINK_LANGUAGE:C>:shared_C>)
+
+
+set (binary_dir "${CMAKE_BINARY_DIR}")
+get_property (is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if (is_multi_config)
+  string (APPEND binary_dir "/Release")
+endif()
+add_library(import STATIC IMPORTED)
+set_property(TARGET import PROPERTY IMPORTED_LOCATION "${binary_dir}/${CMAKE_STATIC_LIBRARY_PREFIX}static1_C${CMAKE_STATIC_LIBRARY_SUFFIX}")
+target_link_libraries (import INTERFACE $<$<LINK_LANGUAGE:C>:shared_C>)
+target_link_libraries (import INTERFACE $<$<LINK_LANGUAGE:CXX>:shared_CXX>)
+
+
+add_library(interface INTERFACE)
+target_link_libraries (interface INTERFACE $<$<LINK_LANGUAGE:C>:shared_C>
+                                           $<$<LINK_LANGUAGE:CXX>:shared_CXX>)
+
+
+add_library(interface2 INTERFACE)
+target_link_libraries (interface2 INTERFACE import)
+
+
+add_library(static3 STATIC empty.c)
+target_link_libraries (static3 PRIVATE interface)
+
+
+add_library(LinkLibraries_lib SHARED lib.c)
+target_link_libraries (LinkLibraries_lib PRIVATE $<$<LINK_LANGUAGE:C>:shared_C>)
+
+add_library(LinkLibraries_lib2 SHARED lib.c)
+target_link_libraries (LinkLibraries_lib2 PRIVATE $<$<LINK_LANGUAGE:C>:static1_C>)
+
+add_library(LinkLibraries_lib3 SHARED lib.c)
+target_link_libraries (LinkLibraries_lib3 PRIVATE $<$<LINK_LANGUAGE:C>:static2_C>)
+
+add_executable(LinkLibraries_exe main.c)
+target_link_libraries (LinkLibraries_exe PRIVATE $<$<LINK_LANGUAGE:C>:shared_C>)
+
+add_executable(LinkLibraries_C_import main.c)
+target_link_libraries (LinkLibraries_C_import PRIVATE import)
+add_executable(LinkLibraries_CXX_import main.cxx)
+target_link_libraries (LinkLibraries_CXX_import PRIVATE import)
+
+add_executable(LinkLibraries_C_interface main.c)
+target_link_libraries (LinkLibraries_C_interface PRIVATE interface)
+add_executable(LinkLibraries_CXX_interface main.cxx)
+target_link_libraries (LinkLibraries_CXX_interface PRIVATE interface)
+
+add_executable(LinkLibraries_C_interface2 main.c)
+target_link_libraries (LinkLibraries_C_interface2 PRIVATE interface2)
+add_executable(LinkLibraries_CXX_interface2 main.cxx)
+target_link_libraries (LinkLibraries_CXX_interface2 PRIVATE interface2)
+
+add_executable(LinkLibraries_C_static main.c)
+target_link_libraries (LinkLibraries_C_static PRIVATE static3)
+add_executable(LinkLibraries_CXX_static main.cxx)
+target_link_libraries (LinkLibraries_CXX_static PRIVATE static3)
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang-result.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang-stderr.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang-stderr.txt
new file mode 100644
index 0000000..2ecdc0c
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang-stderr.txt
@@ -0,0 +1,2 @@
+CMake Error: Evaluation of \$<LINK_LANGUAGE:...> or \$<LINK_LAND_AND_ID:...> changes
+the linker language for target "LinkLibraries_bad_mix_languages" \(from 'C' to 'CXX'\) which is invalid.
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang.cmake b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang.cmake
new file mode 100644
index 0000000..f80010a
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-bad-mix-lang.cmake
@@ -0,0 +1,8 @@
+
+enable_language(C)
+enable_language(CXX)
+
+add_library(static_CXX STATIC func.cxx)
+
+add_executable(LinkLibraries_bad_mix_languages main.c)
+target_link_libraries (LinkLibraries_bad_mix_languages PRIVATE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:static_CXX>)
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-basic-result.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-basic-result.txt
new file mode 100644
index 0000000..8d98f9d
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-basic-result.txt
@@ -0,0 +1 @@
+.*
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-exe_c-result.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-exe_c-result.txt
new file mode 100644
index 0000000..8d98f9d
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-exe_c-result.txt
@@ -0,0 +1 @@
+.*
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-exe_cxx-result.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-exe_cxx-result.txt
new file mode 100644
index 0000000..8d98f9d
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-exe_cxx-result.txt
@@ -0,0 +1 @@
+.*
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-interface-result.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-interface-result.txt
new file mode 100644
index 0000000..8d98f9d
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-interface-result.txt
@@ -0,0 +1 @@
+.*
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-no_language-result.txt b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-no_language-result.txt
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID-no_language-result.txt
@@ -0,0 +1 @@
+0
diff --git a/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID.cmake b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID.cmake
new file mode 100644
index 0000000..9feccd0
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/genex_LINK_LANG_AND_ID.cmake
@@ -0,0 +1,73 @@
+
+cmake_minimum_required(VERSION 3.16...3.17)
+
+enable_language(C)
+enable_language(CXX)
+
+
+add_library(shared_C SHARED func.c)
+add_library(shared_CXX SHARED func.cxx)
+
+
+add_library(static1_C STATIC empty.c)
+target_link_libraries (static1_C INTERFACE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:shared_C>)
+
+add_library(static2_C STATIC empty.c)
+target_link_libraries (static2_C PRIVATE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:shared_C>)
+
+
+set (binary_dir "${CMAKE_BINARY_DIR}")
+get_property (is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if (is_multi_config)
+  string (APPEND binary_dir "/Release")
+endif()
+add_library(import STATIC IMPORTED)
+set_property(TARGET import PROPERTY IMPORTED_LOCATION "${binary_dir}/${CMAKE_STATIC_LIBRARY_PREFIX}static1_C${CMAKE_STATIC_LIBRARY_SUFFIX}")
+target_link_libraries (import INTERFACE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:shared_C>)
+target_link_libraries (import INTERFACE $<$<LINK_LANG_AND_ID:CXX,${CMAKE_CXX_COMPILER_ID}>:shared_CXX>)
+
+
+add_library(interface INTERFACE)
+target_link_libraries (interface INTERFACE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:shared_C>
+                                           $<$<LINK_LANG_AND_ID:CXX,${CMAKE_CXX_COMPILER_ID}>:shared_CXX>)
+
+
+add_library(interface2 INTERFACE)
+target_link_libraries (interface2 INTERFACE import)
+
+
+add_library(static3 STATIC empty.c)
+target_link_libraries (static3 PRIVATE interface)
+
+
+add_library(LinkLibraries_lib SHARED lib.c)
+target_link_libraries (LinkLibraries_lib PRIVATE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:shared_C>)
+
+add_library(LinkLibraries_lib2 SHARED lib.c)
+target_link_libraries (LinkLibraries_lib2 PRIVATE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:static1_C>)
+
+add_library(LinkLibraries_lib3 SHARED lib.c)
+target_link_libraries (LinkLibraries_lib3 PRIVATE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:static2_C>)
+
+add_executable(LinkLibraries_exe main.c)
+target_link_libraries (LinkLibraries_exe PRIVATE $<$<LINK_LANG_AND_ID:C,${CMAKE_C_COMPILER_ID}>:shared_C>)
+
+add_executable(LinkLibraries_C_import main.c)
+target_link_libraries (LinkLibraries_C_import PRIVATE import)
+add_executable(LinkLibraries_CXX_import main.cxx)
+target_link_libraries (LinkLibraries_CXX_import PRIVATE import)
+
+add_executable(LinkLibraries_C_interface main.c)
+target_link_libraries (LinkLibraries_C_interface PRIVATE interface)
+add_executable(LinkLibraries_CXX_interface main.cxx)
+target_link_libraries (LinkLibraries_CXX_interface PRIVATE interface)
+
+add_executable(LinkLibraries_C_interface2 main.c)
+target_link_libraries (LinkLibraries_C_interface2 PRIVATE interface2)
+add_executable(LinkLibraries_CXX_interface2 main.cxx)
+target_link_libraries (LinkLibraries_CXX_interface2 PRIVATE interface2)
+
+add_executable(LinkLibraries_C_static main.c)
+target_link_libraries (LinkLibraries_C_static PRIVATE static3)
+add_executable(LinkLibraries_CXX_static main.cxx)
+target_link_libraries (LinkLibraries_CXX_static PRIVATE static3)
diff --git a/Tests/RunCMake/target_link_libraries/lib.c b/Tests/RunCMake/target_link_libraries/lib.c
new file mode 100644
index 0000000..b2d1b66
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/lib.c
@@ -0,0 +1,10 @@
+
+#if defined(_WIN32)
+__declspec(dllimport)
+#endif
+  void func_c();
+
+void lib()
+{
+  func_c();
+}
diff --git a/Tests/RunCMake/target_link_libraries/main.c b/Tests/RunCMake/target_link_libraries/main.c
new file mode 100644
index 0000000..a908dea
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/main.c
@@ -0,0 +1,12 @@
+
+#if defined(_WIN32)
+__declspec(dllimport)
+#endif
+  void func_c();
+
+int main()
+{
+  func_c();
+
+  return 0;
+}
diff --git a/Tests/RunCMake/target_link_libraries/main.cxx b/Tests/RunCMake/target_link_libraries/main.cxx
new file mode 100644
index 0000000..ffaa3b4
--- /dev/null
+++ b/Tests/RunCMake/target_link_libraries/main.cxx
@@ -0,0 +1,12 @@
+
+#if defined(_WIN32)
+__declspec(dllimport)
+#endif
+  void func_cxx();
+
+int main()
+{
+  func_cxx();
+
+  return 0;
+}