Honor visibility properties for all target types (#15556)

The <LANG>_VISIBILITY_PRESET and VISIBILITY_INLINES_HIDDEN were first
merged in commit v2.8.12~322 (Merge topic 'VISIBILITY_PRESET-property',
2013-06-05) but worked only for shared libraries and executables with
exports.  Prior to commit v3.0.0-rc1~581^2 (GenerateExportHeader:
Deprecate add_compiler_export_flags function., 2013-09-02) the
add_compiler_export_flags function was used to add visibility flags to
all targets.

The visibility flags are useful for sources in all target types because
they may be later linked into shared libraries or executables with
exports.  Introduce policy CMP0063 to enable them for all target types
while preserving compatibility with existing projects that do not expect
this.

14 files changed, 172 insertions, 10 deletions

diff --git a/Tests/RunCMake/TargetPolicies/PolicyList-stderr.txt b/Tests/RunCMake/TargetPolicies/PolicyList-stderr.txt
index 1da1623..d0aa995 100644
--- a/Tests/RunCMake/TargetPolicies/PolicyList-stderr.txt
+++ b/Tests/RunCMake/TargetPolicies/PolicyList-stderr.txt
@@ -18,6 +18,7 @@
    \* CMP0046
    \* CMP0052
    \* CMP0060
+   \* CMP0063
 
 Call Stack \(most recent call first\):
   CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/VisibilityPreset/CMP0063-Common.cmake b/Tests/RunCMake/VisibilityPreset/CMP0063-Common.cmake
new file mode 100644
index 0000000..afea20b
--- /dev/null
+++ b/Tests/RunCMake/VisibilityPreset/CMP0063-Common.cmake
@@ -0,0 +1,7 @@
+set(CMAKE_VISIBILITY_INLINES_HIDDEN 1)
+set(CMAKE_CXX_VISIBILITY_PRESET hidden)
+add_executable(myexe lib.cpp)
+add_library(mystatic STATIC lib.cpp)
+add_library(myshared SHARED lib.cpp)
+add_library(mymodule MODULE lib.cpp)
+add_library(myobject OBJECT lib.cpp)
diff --git a/Tests/RunCMake/VisibilityPreset/CMP0063-NEW.cmake b/Tests/RunCMake/VisibilityPreset/CMP0063-NEW.cmake
new file mode 100644
index 0000000..9d1ee40
--- /dev/null
+++ b/Tests/RunCMake/VisibilityPreset/CMP0063-NEW.cmake
@@ -0,0 +1,8 @@
+cmake_policy(SET CMP0063 NEW)
+enable_language(CXX)
+
+# Ensure CMake would warn even if toolchain does not really have these flags.
+set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
+set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
+
+include(CMP0063-Common.cmake)
diff --git a/Tests/RunCMake/VisibilityPreset/CMP0063-OLD.cmake b/Tests/RunCMake/VisibilityPreset/CMP0063-OLD.cmake
new file mode 100644
index 0000000..8378209
--- /dev/null
+++ b/Tests/RunCMake/VisibilityPreset/CMP0063-OLD.cmake
@@ -0,0 +1,8 @@
+cmake_policy(SET CMP0063 OLD)
+enable_language(CXX)
+
+# Ensure CMake would warn even if toolchain does not really have these flags.
+set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
+set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
+
+include(CMP0063-Common.cmake)
diff --git a/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-no.cmake b/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-no.cmake
new file mode 100644
index 0000000..2a9c9e5
--- /dev/null
+++ b/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-no.cmake
@@ -0,0 +1,8 @@
+
+enable_language(CXX)
+
+# Ensure CMake does not warn even if toolchain really does have these flags.
+unset(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN)
+unset(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY)
+
+include(CMP0063-Common.cmake)
diff --git a/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-yes-stderr.txt b/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-yes-stderr.txt
new file mode 100644
index 0000000..59a4b8f
--- /dev/null
+++ b/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-yes-stderr.txt
@@ -0,0 +1,50 @@
+^CMake Warning \(dev\) at CMP0063-Common.cmake:[0-9]+ \(add_executable\):
+  Policy CMP0063 is not set: Honor visibility properties for all target
+  types.  Run "cmake --help-policy CMP0063" for policy details.  Use the
+  cmake_policy command to set the policy and suppress this warning.
+
+  Target "myexe" of type "EXECUTABLE" has the following visibility properties
+  set for CXX:
+
+    CXX_VISIBILITY_PRESET
+    VISIBILITY_INLINES_HIDDEN
+
+  For compatibility CMake is not honoring them for this target.
+Call Stack \(most recent call first\):
+  CMP0063-WARN-yes.cmake:[0-9]+ \(include\)
+  CMakeLists.txt:[0-9]+ \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.
++
+CMake Warning \(dev\) at CMP0063-Common.cmake:[0-9]+ \(add_library\):
+  Policy CMP0063 is not set: Honor visibility properties for all target
+  types.  Run "cmake --help-policy CMP0063" for policy details.  Use the
+  cmake_policy command to set the policy and suppress this warning.
+
+  Target "myobject" of type "OBJECT_LIBRARY" has the following visibility
+  properties set for CXX:
+
+    CXX_VISIBILITY_PRESET
+    VISIBILITY_INLINES_HIDDEN
+
+  For compatibility CMake is not honoring them for this target.
+Call Stack \(most recent call first\):
+  CMP0063-WARN-yes.cmake:[0-9]+ \(include\)
+  CMakeLists.txt:[0-9]+ \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.
++
+CMake Warning \(dev\) at CMP0063-Common.cmake:[0-9]+ \(add_library\):
+  Policy CMP0063 is not set: Honor visibility properties for all target
+  types.  Run "cmake --help-policy CMP0063" for policy details.  Use the
+  cmake_policy command to set the policy and suppress this warning.
+
+  Target "mystatic" of type "STATIC_LIBRARY" has the following visibility
+  properties set for CXX:
+
+    CXX_VISIBILITY_PRESET
+    VISIBILITY_INLINES_HIDDEN
+
+  For compatibility CMake is not honoring them for this target.
+Call Stack \(most recent call first\):
+  CMP0063-WARN-yes.cmake:[0-9]+ \(include\)
+  CMakeLists.txt:[0-9]+ \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.$
diff --git a/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-yes.cmake b/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-yes.cmake
new file mode 100644
index 0000000..3388e4d
--- /dev/null
+++ b/Tests/RunCMake/VisibilityPreset/CMP0063-WARN-yes.cmake
@@ -0,0 +1,8 @@
+
+enable_language(CXX)
+
+# Ensure CMake warns even if toolchain does not really have these flags.
+set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
+set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
+
+include(CMP0063-Common.cmake)
diff --git a/Tests/RunCMake/VisibilityPreset/CMakeLists.txt b/Tests/RunCMake/VisibilityPreset/CMakeLists.txt
index 12cd3c7..18dfd26 100644
--- a/Tests/RunCMake/VisibilityPreset/CMakeLists.txt
+++ b/Tests/RunCMake/VisibilityPreset/CMakeLists.txt
@@ -1,3 +1,3 @@
-cmake_minimum_required(VERSION 2.8.4)
+cmake_minimum_required(VERSION 3.2)
 project(${RunCMake_TEST} NONE)
 include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/VisibilityPreset/RunCMakeTest.cmake b/Tests/RunCMake/VisibilityPreset/RunCMakeTest.cmake
index 2d78832..c7eb808 100644
--- a/Tests/RunCMake/VisibilityPreset/RunCMakeTest.cmake
+++ b/Tests/RunCMake/VisibilityPreset/RunCMakeTest.cmake
@@ -1,3 +1,7 @@
 include(RunCMake)
 
 run_cmake(PropertyTypo)
+run_cmake(CMP0063-OLD)
+run_cmake(CMP0063-WARN-yes)
+run_cmake(CMP0063-WARN-no)
+run_cmake(CMP0063-NEW)
diff --git a/Tests/Visibility/CMakeLists.txt b/Tests/Visibility/CMakeLists.txt
index df75630..9498ca6 100644
--- a/Tests/Visibility/CMakeLists.txt
+++ b/Tests/Visibility/CMakeLists.txt
@@ -1,13 +1,66 @@
 cmake_minimum_required(VERSION 3.2)
+cmake_policy(SET CMP0063 NEW)
+
 project(Visibility)
 
-add_library(inlines_hidden SHARED foo.cpp bar.c)
-set_property(TARGET inlines_hidden PROPERTY VISIBILITY_INLINES_HIDDEN ON)
-target_compile_options(inlines_hidden PRIVATE -Werror)
+add_library(hidden1 SHARED hidden.c)
+set_property(TARGET hidden1 PROPERTY C_VISIBILITY_PRESET hidden)
+
+add_library(hidden_object OBJECT hidden.c)
+set_property(TARGET hidden_object PROPERTY C_VISIBILITY_PRESET hidden)
+set_property(TARGET hidden_object PROPERTY POSITION_INDEPENDENT_CODE ON)
+
+add_library(hidden_static STATIC hidden.c)
+set_property(TARGET hidden_static PROPERTY C_VISIBILITY_PRESET hidden)
+set_property(TARGET hidden_static PROPERTY POSITION_INDEPENDENT_CODE ON)
+
+add_library(hidden2 SHARED $<TARGET_OBJECTS:hidden_object> shared.c)
+
+add_library(hidden3 SHARED shared.c)
+target_link_libraries(hidden3 hidden_static)
+
+foreach(t
+    hidden1
+    hidden2
+    hidden3
+    )
+  add_custom_command(TARGET ${t} POST_BUILD
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_NM=${CMAKE_NM}
+    -DTEST_LIBRARY_PATH=$<TARGET_FILE:${t}>
+    -P ${CMAKE_CURRENT_SOURCE_DIR}/verify.cmake
+    )
+endforeach()
+
+
+add_library(inlines_hidden1 SHARED foo.cpp bar.c)
+set_property(TARGET inlines_hidden1 PROPERTY VISIBILITY_INLINES_HIDDEN ON)
+target_compile_options(inlines_hidden1 PRIVATE -Werror)
+
+add_library(inlines_hidden_object OBJECT foo.cpp bar.c)
+set_property(TARGET inlines_hidden_object PROPERTY VISIBILITY_INLINES_HIDDEN ON)
+set_property(TARGET inlines_hidden_object PROPERTY POSITION_INDEPENDENT_CODE ON)
+target_compile_options(inlines_hidden_object PRIVATE -Werror)
+
+add_library(inlines_hidden_static STATIC foo.cpp bar.c)
+set_property(TARGET inlines_hidden_static PROPERTY VISIBILITY_INLINES_HIDDEN ON)
+set_property(TARGET inlines_hidden_static PROPERTY POSITION_INDEPENDENT_CODE ON)
+target_compile_options(inlines_hidden_static PRIVATE -Werror)
+
+add_library(inlines_hidden2 SHARED $<TARGET_OBJECTS:inlines_hidden_object> shared.cpp)
+
+add_library(inlines_hidden3 SHARED shared.cpp)
+target_link_libraries(inlines_hidden3 inlines_hidden_static)
 
-add_custom_command(TARGET inlines_hidden POST_BUILD
-  COMMAND ${CMAKE_COMMAND}
+foreach(t
+    inlines_hidden1
+    inlines_hidden2
+    inlines_hidden3
+    )
+  add_custom_command(TARGET ${t} POST_BUILD
+    COMMAND ${CMAKE_COMMAND}
     -DCMAKE_NM=${CMAKE_NM}
-    -DTEST_LIBRARY_PATH=$<TARGET_FILE:inlines_hidden>
+    -DTEST_LIBRARY_PATH=$<TARGET_FILE:${t}>
     -P ${CMAKE_CURRENT_SOURCE_DIR}/verify.cmake
-)
+    )
+endforeach()
diff --git a/Tests/Visibility/hidden.c b/Tests/Visibility/hidden.c
new file mode 100644
index 0000000..6e97343
--- /dev/null
+++ b/Tests/Visibility/hidden.c
@@ -0,0 +1,4 @@
+int hidden_function(void) { return 0; }
+
+__attribute__((visibility("default")))
+int not_hidden(void) { return hidden_function(); }
diff --git a/Tests/Visibility/shared.c b/Tests/Visibility/shared.c
new file mode 100644
index 0000000..bb94976
--- /dev/null
+++ b/Tests/Visibility/shared.c
@@ -0,0 +1,3 @@
+extern int not_hidden(void);
+
+int shared(void) { return not_hidden(); }
diff --git a/Tests/Visibility/shared.cpp b/Tests/Visibility/shared.cpp
new file mode 100644
index 0000000..4897ff8
--- /dev/null
+++ b/Tests/Visibility/shared.cpp
@@ -0,0 +1,8 @@
+extern "C" int bar(void);
+void baz();
+
+int shared()
+{
+  baz();
+  return bar();
+}
diff --git a/Tests/Visibility/verify.cmake b/Tests/Visibility/verify.cmake
index 80dd13c..3b2028c 100644
--- a/Tests/Visibility/verify.cmake
+++ b/Tests/Visibility/verify.cmake
@@ -8,7 +8,7 @@ if(NOT "${RESULT}" STREQUAL "0")
   message(FATAL_ERROR "nm failed [${RESULT}] [${OUTPUT}] [${ERROR}]")
 endif()
 
-if(${OUTPUT} MATCHES "Foo[^\\n]*bar")
+if(${OUTPUT} MATCHES "(Foo[^\\n]*bar|hidden_function)")
   message(FATAL_ERROR
-    "Found Foo::bar() which should have been hidden [${OUTPUT}]")
+    "Found ${CMAKE_MATCH_1} which should have been hidden [${OUTPUT}]")
 endif()