Genex: Enable use of COMPILE_LANGUAGE for compile options.

Follow-ups will allow the use of the generator expression
for compile definitions and include directories for non-IDE
generators.

14 files changed, 100 insertions, 0 deletions

diff --git a/Tests/CMakeCommands/target_compile_options/CMakeLists.txt b/Tests/CMakeCommands/target_compile_options/CMakeLists.txt
index 1d04639..35dd276 100644
--- a/Tests/CMakeCommands/target_compile_options/CMakeLists.txt
+++ b/Tests/CMakeCommands/target_compile_options/CMakeLists.txt
@@ -23,6 +23,21 @@ add_executable(consumer
   "${CMAKE_CURRENT_SOURCE_DIR}/consumer.cpp"
 )
 
+if (NOT CMAKE_GENERATOR MATCHES "Visual Studio")
+  target_sources(consumer PRIVATE
+    "${CMAKE_CURRENT_SOURCE_DIR}/consumer.c"
+  )
+  target_compile_options(consumer
+    PRIVATE
+      -DCONSUMER_LANG_$<COMPILE_LANGUAGE>
+      -DLANG_IS_CXX=$<COMPILE_LANGUAGE:CXX>
+      -DLANG_IS_C=$<COMPILE_LANGUAGE:C>
+  )
+  target_compile_definitions(consumer
+    PRIVATE -DTEST_LANG_DEFINES
+  )
+endif()
+
 target_compile_options(consumer
   PRIVATE $<$<CXX_COMPILER_ID:GNU>:$<TARGET_PROPERTY:target_compile_options,INTERFACE_COMPILE_OPTIONS>>
 )
diff --git a/Tests/CMakeCommands/target_compile_options/consumer.c b/Tests/CMakeCommands/target_compile_options/consumer.c
new file mode 100644
index 0000000..5796d96
--- /dev/null
+++ b/Tests/CMakeCommands/target_compile_options/consumer.c
@@ -0,0 +1,23 @@
+
+#ifdef TEST_LANG_DEFINES
+  #ifdef CONSUMER_LANG_CXX
+  #error Unexpected CONSUMER_LANG_CXX
+  #endif
+
+  #ifndef CONSUMER_LANG_C
+  #error Expected CONSUMER_LANG_C
+  #endif
+
+  #if !LANG_IS_C
+  #error Expected LANG_IS_C
+  #endif
+
+  #if LANG_IS_CXX
+  #error Unexpected LANG_IS_CXX
+  #endif
+#endif
+
+void consumer_c()
+{
+
+}
diff --git a/Tests/CMakeCommands/target_compile_options/consumer.cpp b/Tests/CMakeCommands/target_compile_options/consumer.cpp
index 1299606..c5882a5 100644
--- a/Tests/CMakeCommands/target_compile_options/consumer.cpp
+++ b/Tests/CMakeCommands/target_compile_options/consumer.cpp
@@ -15,4 +15,22 @@
 
 #endif
 
+#ifdef TEST_LANG_DEFINES
+  #ifndef CONSUMER_LANG_CXX
+  #error Expected CONSUMER_LANG_CXX
+  #endif
+
+  #ifdef CONSUMER_LANG_C
+  #error Unexpected CONSUMER_LANG_C
+  #endif
+
+  #if !LANG_IS_CXX
+  #error Expected LANG_IS_CXX
+  #endif
+
+  #if LANG_IS_C
+  #error Unexpected LANG_IS_C
+  #endif
+#endif
+
 int main() { return 0; }
diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index eb42057..9f1256e 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -208,3 +208,5 @@ add_RunCMake_test(IfacePaths_SOURCES TEST_DIR IfacePaths)
 if(RPMBUILD_EXECUTABLE)
   add_RunCMake_test(CPackRPM)
 endif()
+
+add_RunCMake_test(COMPILE_LANGUAGE-genex)
diff --git a/Tests/RunCMake/COMPILE_LANGUAGE-genex/CMakeLists.txt b/Tests/RunCMake/COMPILE_LANGUAGE-genex/CMakeLists.txt
new file mode 100644
index 0000000..ef2163c
--- /dev/null
+++ b/Tests/RunCMake/COMPILE_LANGUAGE-genex/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.1)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions-result.txt b/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions-stderr-VS.txt b/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions-stderr-VS.txt
new file mode 100644
index 0000000..e9e8e9f
--- /dev/null
+++ b/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions-stderr-VS.txt
@@ -0,0 +1,8 @@
+CMake Error at CompileOptions.cmake:5 \(target_compile_options\):
+  Error evaluating generator expression:
+
+    \$<COMPILE_LANGUAGE:CXX>
+
+  \$<COMPILE_LANGUAGE:...> may not be used with Visual Studio generators.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions.cmake b/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions.cmake
new file mode 100644
index 0000000..6c92abc
--- /dev/null
+++ b/Tests/RunCMake/COMPILE_LANGUAGE-genex/CompileOptions.cmake
@@ -0,0 +1,5 @@
+
+enable_language(CXX)
+
+add_executable(main main.cpp)
+target_compile_options(main PRIVATE $<$<COMPILE_LANGUAGE:CXX>:-DANYTHING>)
diff --git a/Tests/RunCMake/COMPILE_LANGUAGE-genex/RunCMakeTest.cmake b/Tests/RunCMake/COMPILE_LANGUAGE-genex/RunCMakeTest.cmake
new file mode 100644
index 0000000..2c5d9ae
--- /dev/null
+++ b/Tests/RunCMake/COMPILE_LANGUAGE-genex/RunCMakeTest.cmake
@@ -0,0 +1,6 @@
+include(RunCMake)
+
+if (RunCMake_GENERATOR MATCHES "Visual Studio")
+    set(RunCMake-stderr-file CompileOptions-stderr-VS.txt)
+    run_cmake(CompileOptions)
+endif()
diff --git a/Tests/RunCMake/COMPILE_LANGUAGE-genex/main.cpp b/Tests/RunCMake/COMPILE_LANGUAGE-genex/main.cpp
new file mode 100644
index 0000000..31a1337
--- /dev/null
+++ b/Tests/RunCMake/COMPILE_LANGUAGE-genex/main.cpp
@@ -0,0 +1,5 @@
+
+int main()
+{
+    return 0;
+}
diff --git a/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang-result.txt b/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang-stderr.txt b/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang-stderr.txt
new file mode 100644
index 0000000..444da45
--- /dev/null
+++ b/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang-stderr.txt
@@ -0,0 +1,8 @@
+CMake Error at COMPILE_LANGUAGE-unknown-lang.cmake:4 \(target_compile_options\):
+  Error evaluating generator expression:
+
+    \$<COMPILE_LANGUAGE:CXX>
+
+  \$<COMPILE_LANGUAGE:...> Unknown language.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang.cmake b/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang.cmake
new file mode 100644
index 0000000..cec12a3
--- /dev/null
+++ b/Tests/RunCMake/GeneratorExpression/COMPILE_LANGUAGE-unknown-lang.cmake
@@ -0,0 +1,4 @@
+
+enable_language(C)
+add_executable(empty empty.c)
+target_compile_options(empty PRIVATE $<$<COMPILE_LANGUAGE:CXX>:-Wall>)
diff --git a/Tests/RunCMake/GeneratorExpression/RunCMakeTest.cmake b/Tests/RunCMake/GeneratorExpression/RunCMakeTest.cmake
index f591c3d..542b7fc 100644
--- a/Tests/RunCMake/GeneratorExpression/RunCMakeTest.cmake
+++ b/Tests/RunCMake/GeneratorExpression/RunCMakeTest.cmake
@@ -23,6 +23,7 @@ run_cmake(COMPILE_LANGUAGE-target_sources)
 run_cmake(COMPILE_LANGUAGE-add_executable)
 run_cmake(COMPILE_LANGUAGE-add_library)
 run_cmake(COMPILE_LANGUAGE-add_test)
+run_cmake(COMPILE_LANGUAGE-unknown-lang)
 
 if(LINKER_SUPPORTS_PDB)
   run_cmake(NonValidTarget-TARGET_PDB_FILE)