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GenerateExportHeader: always fill in _EXPORT macros

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The `_EXPORT` and `_NO_EXPORT` macros should always be made properly
because the `<LANG>_VISIBILITY_PRESET` properties are controlled
independently of this module.

One case where this breaks compatibility is where a project was setting
`USE_COMPILER_HIDDEN_VISIBILITY=OFF` and then marking a symbol used
outside of the library with `_NO_EXPORT` which is a contridiction.
This commit is contained in:
Ben Boeckel
2016-07-11 14:52:05 -04:00
parent e781223c88
commit 9eb05b48cd
2 changed files with 5 additions and 5 deletions
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8
Modules/GenerateExportHeader.cmake
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@@ -215,9 +215,6 @@ macro(_test_compiler_hidden_visibility)
check_cxx_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
check_cxx_compiler_flag(-fvisibility-inlines-hidden
COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
option(USE_COMPILER_HIDDEN_VISIBILITY
"Use HIDDEN visibility support if available." ON)
mark_as_advanced(USE_COMPILER_HIDDEN_VISIBILITY)
endif()
endmacro()
@@ -267,7 +264,7 @@ macro(_DO_SET_MACRO_VALUES TARGET_LIBRARY)
if(WIN32 OR CYGWIN)
set(DEFINE_EXPORT "__declspec(dllexport)")
set(DEFINE_IMPORT "__declspec(dllimport)")
elseif(COMPILER_HAS_HIDDEN_VISIBILITY AND USE_COMPILER_HIDDEN_VISIBILITY)
elseif(COMPILER_HAS_HIDDEN_VISIBILITY)
set(DEFINE_EXPORT "__attribute__((visibility(\"default\")))")
set(DEFINE_IMPORT "__attribute__((visibility(\"default\")))")
set(DEFINE_NO_EXPORT "__attribute__((visibility(\"hidden\")))")
@@ -388,6 +385,9 @@ function(add_compiler_export_flags)
_test_compiler_hidden_visibility()
_test_compiler_has_deprecated()
option(USE_COMPILER_HIDDEN_VISIBILITY
"Use HIDDEN visibility support if available." ON)
mark_as_advanced(USE_COMPILER_HIDDEN_VISIBILITY)
if(NOT (USE_COMPILER_HIDDEN_VISIBILITY AND COMPILER_HAS_HIDDEN_VISIBILITY))
# Just return if there are no flags to add.
return()

2
Tests/RunCMake/GenerateExportHeader/GEH.cmake
View File

@@ -110,7 +110,7 @@ if (WIN32 OR CYGWIN)
else()
set(_platform WinEmpty)
endif()
elseif(COMPILER_HAS_HIDDEN_VISIBILITY AND USE_COMPILER_HIDDEN_VISIBILITY)
elseif(COMPILER_HAS_HIDDEN_VISIBILITY)
set(_platform UNIX)
elseif(COMPILER_HAS_DEPRECATED)
set(_platform UNIX_DeprecatedOnly)