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[libc++] Add _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS

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It's useful to be able to disable visibility annotations entirely; for
example, if we're building libc++ static to include in another library,
and we don't want any libc++ functions getting exported out of that
library. This is a generalization of _LIBCPP_DISABLE_DLL_IMPORT_EXPORT.

Differential Revision: https://reviews.llvm.org/D26934

llvm-svn: 288690
This commit is contained in:
Shoaib Meenai 2016-12-05 19:40:12 +00:00
parent 846b8f79d4
commit fc6100c195
4 changed files with 43 additions and 9 deletions
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2
libcxx/CMakeLists.txt
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@ -518,7 +518,7 @@ config_define_if(LIBCXX_HAS_MUSL_LIBC _LIBCPP_HAS_MUSL_LIBC)
# static library only we modify the headers to disable DLL import/export.
if (DEFINED WIN32 AND LIBCXX_ENABLE_STATIC AND NOT LIBCXX_ENABLE_SHARED)
message(STATUS "Generating custom __config for non-DLL Windows build")
config_define(ON _LIBCPP_DISABLE_DLL_IMPORT_EXPORT)
config_define(ON _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
endif()
if (LIBCXX_NEEDS_SITE_CONFIG)

6
libcxx/docs/UsingLibcxx.rst
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@ -149,3 +149,9 @@ thread safety annotations.
This macro is used to enable -Wthread-safety annotations on libc++'s
``std::mutex`` and ``std::lock_guard``. By default these annotations are
disabled and must be manually enabled by the user.
**_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS**:
This macro is used to disable all visibility annotations inside libc++.
Defining this macro and then building libc++ with hidden visibility gives a
build of libc++ which does not export any symbols, which can be useful when
building statically for inclusion into another library.

42
libcxx/include/__config
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@ -510,7 +510,7 @@ namespace std {
#ifdef _WIN32
#if defined(_LIBCPP_DISABLE_DLL_IMPORT_EXPORT)
#if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_DLL_VIS
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
@ -546,18 +546,30 @@ namespace std {
#endif // _WIN32
#ifndef _LIBCPP_HIDDEN
#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_HIDDEN __attribute__ ((__visibility__("hidden")))
#else
#define _LIBCPP_HIDDEN
#endif
#endif
#ifndef _LIBCPP_FUNC_VIS
#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_FUNC_VIS __attribute__ ((__visibility__("default")))
#else
#define _LIBCPP_FUNC_VIS
#endif
#endif
#ifndef _LIBCPP_TYPE_VIS
# if __has_attribute(__type_visibility__)
# define _LIBCPP_TYPE_VIS __attribute__ ((__type_visibility__("default")))
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# if __has_attribute(__type_visibility__)
# define _LIBCPP_TYPE_VIS __attribute__ ((__type_visibility__("default")))
# else
# define _LIBCPP_TYPE_VIS __attribute__ ((__visibility__("default")))
# endif
# else
# define _LIBCPP_TYPE_VIS __attribute__ ((__visibility__("default")))
# define _LIBCPP_TYPE_VIS
# endif
#endif
@ -574,11 +586,15 @@ namespace std {
#endif
#ifndef _LIBCPP_EXCEPTION_ABI
#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_EXCEPTION_ABI __attribute__ ((__visibility__("default")))
#else
#define _LIBCPP_EXCEPTION_ABI
#endif
#endif
#ifndef _LIBCPP_ENUM_VIS
# if __has_attribute(__type_visibility__)
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
# define _LIBCPP_ENUM_VIS __attribute__ ((__type_visibility__("default")))
# else
# define _LIBCPP_ENUM_VIS
@ -586,7 +602,7 @@ namespace std {
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# if __has_attribute(__type_visibility__)
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS __attribute__ ((__type_visibility__("default")))
# else
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
@ -598,15 +614,27 @@ namespace std {
#endif
#ifndef _LIBCPP_INLINE_VISIBILITY
#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__visibility__("hidden"), __always_inline__))
#else
#define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__always_inline__))
#endif
#endif
#ifndef _LIBCPP_ALWAYS_INLINE
#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__visibility__("hidden"), __always_inline__))
#else
#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__))
#endif
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
# define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__((__visibility__("default"), __always_inline__))
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__((__visibility__("default"), __always_inline__))
# else
# define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__((__always_inline__))
# endif
#endif
#ifndef _LIBCPP_PREFERRED_OVERLOAD

2
libcxx/include/__config_site.in
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@ -21,6 +21,6 @@
#cmakedefine _LIBCPP_HAS_MUSL_LIBC
#cmakedefine _LIBCPP_HAS_THREAD_API_PTHREAD
#cmakedefine _LIBCPP_HAS_THREAD_API_EXTERNAL
#cmakedefine _LIBCPP_DISABLE_DLL_IMPORT_EXPORT
#cmakedefine _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS
#endif // _LIBCPP_CONFIG_SITE