[libc++] Granularize system_error.

Reviewed By: #libc, philnik

Differential Revision: https://reviews.llvm.org/D147853

[libc++] Use the _LIBCPP_VERBOSE_ABORT macro instead of calling the function directly

These calls were added in D141222.

Reviewed By: #libc, ldionne

Spies: ldionne, libcxx-commits, smeenai, mikhai

[libc++] Use the _LIBCPP_VERBOSE_ABORT macro instead of calling the function directly

These calls were added in D141222.

Reviewed By: #libc, ldionne

Spies: ldionne, libcxx-commits, smeenai, mikhail.ramalho

Differential Revision: https://reviews.llvm.org/D146227

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[libc++] Use __verbose_abort instead of std::abort in __throw_ functions

This results in proper error messages instead of just an abort.

Reviewed By: ldionne, Mordante, #libc

Spies: #libc_vendors,

[libc++] Use __verbose_abort instead of std::abort in __throw_ functions

This results in proper error messages instead of just an abort.

Reviewed By: ldionne, Mordante, #libc

Spies: #libc_vendors, smeenai, libcxx-commits

Differential Revision: https://reviews.llvm.org/D141222

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[libc++] Granularize <atomic> includes

Reviewed By: ldionne, Mordante, #libc

Spies: arichardson, libcxx-commits

Differential Revision: https://reviews.llvm.org/D144255

[libc++][NFC] Rename _LIBCPP_NO_EXCEPTIONS to _LIBCPP_HAS_NO_EXCEPTIONS

Other macros that disable parts of the library are named `_LIBCPP_HAS_NO_WHATEVER`.

Reviewed By: ldionne, Mordante, #libc

Sp

[libc++][NFC] Rename _LIBCPP_NO_EXCEPTIONS to _LIBCPP_HAS_NO_EXCEPTIONS

Other macros that disable parts of the library are named `_LIBCPP_HAS_NO_WHATEVER`.

Reviewed By: ldionne, Mordante, #libc

Spies: libcxx-commits, smeenai

Differential Revision: https://reviews.llvm.org/D143163

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[libc++] Add custom clang-tidy checks

Reviewed By: #libc, ldionne

Spies: jwakely, beanz, smeenai, cfe-commits, tschuett, avogelsgesang, Mordante, sstefan1, libcxx-commits, ldionne, mgorny, arichard

[libc++] Add custom clang-tidy checks

Reviewed By: #libc, ldionne

Spies: jwakely, beanz, smeenai, cfe-commits, tschuett, avogelsgesang, Mordante, sstefan1, libcxx-commits, ldionne, mgorny, arichardson, miyuki

Differential Revision: https://reviews.llvm.org/D131963

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[libc++] Split __allocator_destructor out of shared_ptr.h

Reviewed By: ldionne, huixie90, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D134479

[libc++] Granularize <concept> includes

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D137283

[libc++][NFC] Fix some standard-mandated includes comments

Reviewed By: ldionne, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D134447

[libc++][NFC] Enable modernize-use-override

Reviewed By: Mordante, #libc

Spies: aheejin, libcxx-commits, smeenai

Differential Revision: https://reviews.llvm.org/D124714

[libc++] Add a bunch of missing _LIBCPP_HIDE_FROM_ABI

Reviewed By: ldionne, Mordante, var-const, huixie90, #libc

Spies: jloser, libcxx-commits, arichardson, miyuki

Differential Revision: https://r

[libc++] Add a bunch of missing _LIBCPP_HIDE_FROM_ABI

Reviewed By: ldionne, Mordante, var-const, huixie90, #libc

Spies: jloser, libcxx-commits, arichardson, miyuki

Differential Revision: https://reviews.llvm.org/D129968

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[libc++] Mark standard-mandated includes as such

Reviewed By: ldionne, Mordante, #libc, saugustine

Spies: saugustine, MaskRay, arichardson, mstorsjo, jloser, libcxx-commits, arphaman

Differential

[libc++] Mark standard-mandated includes as such

Reviewed By: ldionne, Mordante, #libc, saugustine

Spies: saugustine, MaskRay, arichardson, mstorsjo, jloser, libcxx-commits, arphaman

Differential Revision: https://reviews.llvm.org/D127953

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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

[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

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[libc++] Ensure that all public C++ headers include <__assert>

This patch changes the requirement for getting the declaration of the
assertion handler from including <__assert> to including any publ

[libc++] Ensure that all public C++ headers include <__assert>

This patch changes the requirement for getting the declaration of the
assertion handler from including <__assert> to including any public
C++ header of the library. Note that C compatibility headers are
excluded because we don't implement all the C headers ourselves --
some of them are taken straight from the C library, like assert.h.

It also adds a generated test to check it. Furthermore, this new
generated test is designed in a way that will make it possible to
replace almost all the existing test-generation scripts with this
system in upcoming patches.

Differential Revision: https://reviews.llvm.org/D122506

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[libc++] Granularize <utility> includes

Reviewed By: ldionne, #libc

Spies: EricWF, libcxx-commits, arphaman

Differential Revision: https://reviews.llvm.org/D120466

[libc++] Fix initialization of __fill_

`basic_ios` delays initialization of `__fill_` to `widen(' ')` until `fill()` is called. But, `fill(char_type)` is missing this logic, so the fill character do

[libc++] Fix initialization of __fill_

`basic_ios` delays initialization of `__fill_` to `widen(' ')` until `fill()` is called. But, `fill(char_type)` is missing this logic, so the fill character does not get initialized to whitespace if `fill(char_type)` is called first. This patch adds this logic to `fill(char_type)`.

Reviewed By: #libc, ldionne, Quuxplusone

Differential Revision: https://reviews.llvm.org/D120751

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[libc++] Remove _LIBCPP_HAS_NO_STRONG_ENUMS.

All supported compilers have implemented this feature.
Therefore use the language version instead of the feature macro.

Reviewed By: #libc, philnik, ldi

[libc++] Remove _LIBCPP_HAS_NO_STRONG_ENUMS.

All supported compilers have implemented this feature.
Therefore use the language version instead of the feature macro.

Reviewed By: #libc, philnik, ldionne, Quuxplusone

Differential Revision: https://reviews.llvm.org/D119865

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[libc++] Move fpos into its own header

For some reason `<string>` defines `std::fpos`, which should be defined in `<ios>`.

Reviewed By: Quuxplusone, Mordante, #libc

Spies: libcxx-commits, mgorny

[libc++] Move fpos into its own header

For some reason `<string>` defines `std::fpos`, which should be defined in `<ios>`.

Reviewed By: Quuxplusone, Mordante, #libc

Spies: libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D118914

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[libc++] Normalize all our '#pragma GCC system_header', and regression-test.

Now we'll notice if a header forgets to include this magic phrase.

Differential Revision: https://reviews.llvm.org/D1188

[libc++] Normalize all our '#pragma GCC system_header', and regression-test.

Now we'll notice if a header forgets to include this magic phrase.

Differential Revision: https://reviews.llvm.org/D118800

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[libc++] Add the version header to all headers.

Some headers which require the version header depend on other headers to
provide it. Include the version header in all top-level headers to make
sure

[libc++] Add the version header to all headers.

Some headers which require the version header depend on other headers to
provide it. Include the version header in all top-level headers to make
sure a header cleanup can't remove the version header.

Note this doesn't add the version header to the c headers.

Reviewed By: #libc, Quuxplusone, ldionne

Differential Revision: https://reviews.llvm.org/D116172

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[libc++] `= delete` member functions with // = delete;

Use `= delete` for member functions that are marked with `// = delete;`

Reviewed By: ldionne, Quuxplusone, #libc

Spies: jloser, libcxx-commit

[libc++] `= delete` member functions with // = delete;

Use `= delete` for member functions that are marked with `// = delete;`

Reviewed By: ldionne, Quuxplusone, #libc

Spies: jloser, libcxx-commits

Differential Revision: https://reviews.llvm.org/D115291

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[runtimes][NFC] Remove filenames at the top of the license notice

We've stopped doing it in libc++ for a while now because these names
would end up rotting as we move things around and copy/paste st

[runtimes][NFC] Remove filenames at the top of the license notice

We've stopped doing it in libc++ for a while now because these names
would end up rotting as we move things around and copy/paste stuff.
This cleans up all the existing files so as to stop the spreading
as people copy-paste headers around.

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[libc++] Restore `basic_ios`'s implicit conversion to `bool` in C++03 mode.

efriedma noted that D104682 broke this test case, reduced from SPEC2006.

#include <istream>
bool a(std::istream a

[libc++] Restore `basic_ios`'s implicit conversion to `bool` in C++03 mode.

efriedma noted that D104682 broke this test case, reduced from SPEC2006.

#include <istream>
bool a(std::istream a) {
return a.getline(0,0) == 0;
}

We can unbreak it by restoring the conversion to something-convertible-to-bool.
We chose `void*` in order to match libstdc++.

For more ancient history, see PR19460: https://bugs.llvm.org/show_bug.cgi?id=19460

Differential Revision: https://reviews.llvm.org/D107663

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[libc++] Remove some _LIBCPP_CXX03_LANG from iostreams headers.

With the STL containers, I didn't enable move operations in C++03 mode
because that would change the overload resolution for things th

[libc++] Remove some _LIBCPP_CXX03_LANG from iostreams headers.

With the STL containers, I didn't enable move operations in C++03 mode
because that would change the overload resolution for things that today
are copy operations. With iostreams, though, the copy operations aren't
present at all, and so I see no problem with enabling move operations
even in (Clang's greatly extended) C++03 mode.

Clang's C++03 mode does not support delegating constructors.

Differential Revision: https://reviews.llvm.org/D104310

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[libc++] Enable `explicit` conversion operators, even in C++03 mode.

C++03 didn't support `explicit` conversion operators;
but Clang's C++03 mode does, as an extension, so we can use it.
This lets u

[libc++] Enable `explicit` conversion operators, even in C++03 mode.

C++03 didn't support `explicit` conversion operators;
but Clang's C++03 mode does, as an extension, so we can use it.
This lets us make the conversion explicit in `std::function` (even in '03),
and remove some silly metaprogramming in `std::basic_ios`.

Drive-by improvements to the tests for these operators, in addition
to making sure all these tests also run in `c++03` mode.

Differential Revision: https://reviews.llvm.org/D104682

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