b8c59211ed
Now that MSVC support has landed in the most recent nightlies we can now have
MSVC bootstrap itself without going through a GNU compiler first. Unfortunately,
however, the bootstrap currently fails due to the compiler not being able to
find the llvm-ar.exe tool during the stage0 libcore compile. The compiler cannot
find this tool because it's looking inside a directory that does not exist:
$SYSROOT/rustlib/x86_64-pc-windows-gnu/bin
The `gnu` on this triple is because the bootstrap compiler's host architecture
is GNU. The build system, however, only arranges for the llvm-ar.exe tool to be
available in this location:
$SYSROOT/rustlib/x86_64-pc-windows-msvc/bin
To resolve this discrepancy, the build system has been modified to understand
triples that are bootstrapped from another triple, and in this case copy the
native tools to the right location.
87 lines
4 KiB
Makefile
87 lines
4 KiB
Makefile
# x86_64-pc-windows-msvc configuration
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CC_x86_64-pc-windows-msvc="$(CFG_MSVC_CL)" -nologo
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LINK_x86_64-pc-windows-msvc="$(CFG_MSVC_LINK)" -nologo
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CXX_x86_64-pc-windows-msvc="$(CFG_MSVC_CL)" -nologo
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CPP_x86_64-pc-windows-msvc="$(CFG_MSVC_CL)" -nologo
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AR_x86_64-pc-windows-msvc="$(CFG_MSVC_LIB)" -nologo
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CFG_LIB_NAME_x86_64-pc-windows-msvc=$(1).dll
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CFG_STATIC_LIB_NAME_x86_64-pc-windows-msvc=$(1).lib
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CFG_LIB_GLOB_x86_64-pc-windows-msvc=$(1)-*.dll
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CFG_LIB_DSYM_GLOB_x86_64-pc-windows-msvc=$(1)-*.dylib.dSYM
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CFG_JEMALLOC_CFLAGS_x86_64-pc-windows-msvc :=
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CFG_GCCISH_CFLAGS_x86_64-pc-windows-msvc :=
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CFG_GCCISH_CXXFLAGS_x86_64-pc-windows-msvc :=
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CFG_GCCISH_LINK_FLAGS_x86_64-pc-windows-msvc :=
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CFG_GCCISH_DEF_FLAG_x86_64-pc-windows-msvc :=
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CFG_LLC_FLAGS_x86_64-pc-windows-msvc :=
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CFG_INSTALL_NAME_x86_64-pc-windows-msvc =
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CFG_EXE_SUFFIX_x86_64-pc-windows-msvc := .exe
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CFG_WINDOWSY_x86_64-pc-windows-msvc := 1
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CFG_UNIXY_x86_64-pc-windows-msvc :=
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CFG_LDPATH_x86_64-pc-windows-msvc :=
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CFG_RUN_x86_64-pc-windows-msvc=$(2)
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CFG_RUN_TARG_x86_64-pc-windows-msvc=$(call CFG_RUN_x86_64-pc-windows-msvc,,$(2))
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CFG_GNU_TRIPLE_x86_64-pc-windows-msvc := x86_64-pc-win32
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# These two environment variables are scraped by the `./configure` script and
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# are necessary for `cl.exe` to find standard headers (the INCLUDE variable) and
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# for `link.exe` to find standard libraries (the LIB variable).
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ifdef CFG_MSVC_INCLUDE_PATH
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export INCLUDE := $(CFG_MSVC_INCLUDE_PATH)
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endif
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ifdef CFG_MSVC_LIB_PATH
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export LIB := $(CFG_MSVC_LIB_PATH)
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endif
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# Unfortunately `link.exe` is also a program in `/usr/bin` on MinGW installs,
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# but it's not the one that we want. As a result we make sure that our detected
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# `link.exe` shows up in PATH first.
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ifdef CFG_MSVC_LINK
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export PATH := $(CFG_MSVC_ROOT)/VC/bin/amd64:$(PATH)
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endif
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# There are more comments about this available in the target specification for
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# Windows MSVC in the compiler, but the gist of it is that we use `llvm-ar.exe`
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# instead of `lib.exe` for assembling archives, so we need to inject this custom
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# dependency here.
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NATIVE_TOOL_DEPS_core_T_x86_64-pc-windows-msvc += llvm-ar.exe
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INSTALLED_BINS_x86_64-pc-windows-msvc += llvm-ar.exe
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# When working with MSVC on windows, each DLL needs to explicitly declare its
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# interface to the outside world through some means. The options for doing so
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# include:
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#
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# 1. A custom attribute on each function itself
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# 2. A linker argument saying what to export
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# 3. A file which lists all symbols that need to be exported
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#
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# The Rust compiler takes care (1) for us for all Rust code by annotating all
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# public-facing functions with dllexport, but we have a few native dependencies
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# which need to cross the DLL boundary. The most important of these dependencies
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# is LLVM which is linked into `rustc_llvm.dll` but primarily used from
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# `rustc_trans.dll`. This means that many of LLVM's C API functions need to be
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# exposed from `rustc_llvm.dll` to be forwarded over the boundary.
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#
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# Unfortunately, at this time, LLVM does not handle this sort of exportation on
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# Windows for us, so we're forced to do it ourselves if we want it (which seems
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# like the path of least resistance right now). To do this we generate a `.DEF`
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# file [1] which we then custom-pass to the linker when building the rustc_llvm
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# crate. This DEF file list all symbols that are exported from
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# `src/librustc_llvm/lib.rs` and is generated by a small python script.
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#
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# Fun times!
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#
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# [1]: https://msdn.microsoft.com/en-us/library/28d6s79h.aspx
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RUSTFLAGS_rustc_llvm_T_x86_64-pc-windows-msvc += \
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-C link-args="-DEF:x86_64-pc-windows-msvc/rt/rustc_llvm.def"
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CUSTOM_DEPS_rustc_llvm_T_x86_64-pc-windows-msvc += \
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x86_64-pc-windows-msvc/rt/rustc_llvm.def
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x86_64-pc-windows-msvc/rt/rustc_llvm.def: $(S)src/etc/mklldef.py \
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$(S)src/librustc_llvm/lib.rs
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$(CFG_PYTHON) $^ $@ rustc_llvm-$(CFG_FILENAME_EXTRA)
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# All windows nightiles are currently a GNU triple, so this MSVC triple is not
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# bootstrapping from itself. This is relevant during stage0, and other parts of
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# the build system take this into account.
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BOOTSTRAP_FROM_x86_64-pc-windows-msvc := x86_64-pc-windows-gnu
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