Disclaimer: Forgive me if my format sucks, I've never submitted a PR before!
Fixes: #517
I added a few things to allow zig to link with the CRT properly both statically and dynamically. In Visual Studio 2017, Microsoft changed how the c-runtime is factored again. With this change, they also added a COM interface to allow you to query the respective Visual Studio instance for two of them. This does that and also falls back on a registry query for 2015 support. If you're using a Visual Studio instance older than 2015, you'll have to use the existing options available with the zig compiler. Changes are listed below along with a general description of the changes.
all_types.cpp:
The separate variables for msvc/kern32 have been removed and all win32 libc directory paths have been combined into a ZigList since we're querying more than two directories and differentiating one from another doesn't matter to lld.
analyze.cpp:
The existing functions were extended to support querying libc libs & libc headers at runtime.
codegen.cpp/hpp:
Microsoft uses the new 'Universal C Runtime' name now. Doesn't matter from a functionality standpoint. I left the compiler switches as is to not introduce any breaking changes.
link.cpp:
We're linking 4 libs and generating another in order to support the UCRT.
Dynamic: msvcrt/d, vcruntime/d, ucrt/d, legacy_stdio_definitions.lib
Static: libcmt/d, libvcruntime/d libucrt/d, legacy_stdio_definitions.lib
main.cpp:
Update function call names.
os.cpp/hpp:
COM/Registry interface for querying Windows UCRT/SDK.
Sources:
[Windows CRT](https://docs.microsoft.com/en-us/cpp/c-runtime-library/crt-library-features)
[VS 2015 Breaking Changes](https://msdn.microsoft.com/en-us/library/bb531344.aspx)
normally we want to use llvm types for constants. but
union constants (which are found inside enums) when
they are initialized with the non-most-aligned-member
must be unnamed structs.
these bubble up to all aggregate types. if a constant of
an aggregate type contains, recursively, a union constant
with a non-most-aligned-member initialized, the aggregate
typed constant must be unnamed too.
this fixes some of the asserts that were coming in from
llvm master branch.
the optimizer was deleting compiler_rt symbols, so I changed
the linkage type from LinkOnce to Weak
also changed LinkOnce to mean linkonce_odr in llvm and
Weak to mean weak_odr in llvm.
See #563
previously we did linear search to find existing global
declarations; now we index using a hash map.
building tetris went from taking 5.3 sec to 0.76 sec
I had to revert the target native features thing because there
is still some incorrect behavior with f128.
Reopens#508
partially reverts b505462509
See #302
