LLVM does have llvm-rc, which almost does what is needed.
Currently missing features:
- It doesn't run the C preprocessor (which can be wrapped with
a shellscript easily if necessary)
- It chokes on C structs/typedefs normally found in included
C headers
Provide wrappers named <triplet>-gcc and <triplet>-g++ as well,
to ease cross compilation with e.g. autotools, to allow just
specifying --host=<triplet>.
Provide wrappers for objdump and ld that provide specific output
that autotools look for.
Provide <triplet>-strip as a symlink to /bin/true, since there is
no strip tool available yet (and llvm-objcopy doesn't support
COFF yet).
This version of mingw-w64 provides a few more import libraries
for aarch64, and allows using a lot more uncommon stdio functions
with ucrtbase.
The new libcxx version allows forcing using win32 threads even
if pthread.h exists.
This includes support for a -fdwarf-exceptions flag in clang,
allowing to choose that exception handling model on architectures
where it isn't the default.
This avoids having to manually add -lpsapi when linking in libc++.a.
This requires using a new script to merge libraries using ar -M
with a small MRI script.
The script merge_archives.py in libcxx does the merge by manually
extracting all object files and creating a new archive out of them.
The import libraries created by LLVM have more than one object file
with the same file name (just like MSVC tools do), so extracting
them doesn't work as intended - but merging using a MRI script works.
This is the correct layering/ordering.
This requies setting forcing CXX_SUPPORTS_CXX11=TRUE in cmake,
since it tries linking to see whether the C++ environment works,
but we haven't built libcxx yet.
Manually add the libcxx include directory to the include path
(since libunwind does use some C++ headers but doesn't require
linking to C++ libraries).
Dwarf is also the default in clang on i686, but libunwind currently
has an issue relating to unwinding dwarf exceptions on i686 on
windows (and less easily reproducible on other platforms),
see https://reviews.llvm.org/D38680.
This enables exceptions on aarch64, where they previously were
avoided/disabled.
When linking to a statically linked libunwind with support for
dwarf, one (currently) has to link in -lpsapi.
This actually gets set by default by the installed config headers,
depending on how the libraries were configured.
Also, the -Xclang -flto-visibility-public-std workaround doesn't
seem to be necessary while building these test apps (but it might
potentially be necessary if building more complicated apps).
Martin Storsjö