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[libc++] Improve error messages for disabled modes 

We should not surface CMake-level options like LIBCXX_ENABLE_FILESYSTEM
to our users, since they don't know what it means. Instead, use a slightly
more general wording.

Also, add an error in <ios> to improve the quality of errors for people
trying to use <iostream> when localization is disabled.

Differential Revision: https://reviews.llvm.org/D125910
This commit is contained in:
Louis Dionne 2022-05-18 13:17:14 -04:00
parent 422ec52438
commit 1c4b31c38b
9 changed files with 17 additions and 18 deletions
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2
libcxx/include/barrier
View File

@ -59,7 +59,7 @@ namespace std
#endif
#ifdef _LIBCPP_HAS_NO_THREADS
# error <barrier> is not supported on this single threaded system
# error "<barrier> is not supported since libc++ has been configured without support for threads."
#endif
_LIBCPP_PUSH_MACROS

2
libcxx/include/filesystem
View File

@ -261,7 +261,7 @@ inline constexpr bool std::ranges::enable_view<std::filesystem::recursive_direct
#include <version>
#if defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
# error "The Filesystem library is not supported since libc++ has been configured with LIBCXX_ENABLE_FILESYSTEM disabled"
# error "The <filesystem> library is not supported since libc++ has been configured without support for a filesystem."
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

6
libcxx/include/future
View File

@ -383,8 +383,8 @@ template <class R, class Alloc> struct uses_allocator<packaged_task<R>, Alloc>;
#endif
#ifdef _LIBCPP_HAS_NO_THREADS
#error <future> is not supported on this single threaded system
#else // !_LIBCPP_HAS_NO_THREADS
# error "<future> is not supported since libc++ has been configured without support for threads."
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
@ -2432,6 +2432,4 @@ future<void>::share() _NOEXCEPT
_LIBCPP_END_NAMESPACE_STD
#endif // !_LIBCPP_HAS_NO_THREADS
#endif // _LIBCPP_FUTURE

7
libcxx/include/ios
View File

@ -210,8 +210,13 @@ storage-class-specifier const error_category& iostream_category() noexcept;
*/
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#if defined(_LIBCPP_HAS_NO_LOCALIZATION)
# error "The iostreams library is not supported since libc++ has been configured without support for localization."
#endif
#include <__assert> // all public C++ headers provide the assertion handler
#include <__ios/fpos.h>
#include <__locale>
#include <__utility/swap.h>

2
libcxx/include/latch
View File

@ -51,7 +51,7 @@ namespace std
#endif
#ifdef _LIBCPP_HAS_NO_THREADS
# error <latch> is not supported on this single threaded system
# error "<latch> is not supported since libc++ has been configured without support for threads."
#endif
_LIBCPP_PUSH_MACROS

2
libcxx/include/locale.h
View File

@ -36,7 +36,7 @@ Functions:
#include <__config>
#if defined(_LIBCPP_HAS_NO_LOCALIZATION)
# error "The Localization library is not supported since libc++ has been configured with LIBCXX_ENABLE_LOCALIZATION disabled"
# error "<locale.h> is not supported since libc++ has been configured without support for localization."
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

2
libcxx/include/semaphore
View File

@ -59,7 +59,7 @@ using binary_semaphore = counting_semaphore<1>;
#endif
#ifdef _LIBCPP_HAS_NO_THREADS
# error <semaphore> is not supported on this single threaded system
# error "<semaphore> is not supported since libc++ has been configured without support for threads."
#endif
_LIBCPP_PUSH_MACROS

6
libcxx/include/shared_mutex
View File

@ -140,8 +140,8 @@ _LIBCPP_PUSH_MACROS
#endif
#ifdef _LIBCPP_HAS_NO_THREADS
#error <shared_mutex> is not supported on this single threaded system
#else // !_LIBCPP_HAS_NO_THREADS
# error "<shared_mutex> is not supported since libc++ has been configured without support for threads."
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
@ -501,8 +501,6 @@ swap(shared_lock<_Mutex>& __x, shared_lock<_Mutex>& __y) _NOEXCEPT
_LIBCPP_END_NAMESPACE_STD
#endif // !_LIBCPP_HAS_NO_THREADS
#endif // _LIBCPP_STD_VER > 11
_LIBCPP_POP_MACROS

6
libcxx/include/thread
View File

@ -105,8 +105,8 @@ _LIBCPP_PUSH_MACROS
#include <__undef_macros>
#ifdef _LIBCPP_HAS_NO_THREADS
#error <thread> is not supported on this single threaded system
#else // !_LIBCPP_HAS_NO_THREADS
# error "<thread> is not supported since libc++ has been configured without support for threads."
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
@ -401,8 +401,6 @@ void yield() _NOEXCEPT {__libcpp_thread_yield();}
_LIBCPP_END_NAMESPACE_STD
#endif // !_LIBCPP_HAS_NO_THREADS
_LIBCPP_POP_MACROS
#endif // _LIBCPP_THREAD