Cross-compiling to Windows is broken

[emberian]

(See later posts, _Unwind_Resume symbol is missing)

[emberian]

It's not just clang! With gcc:

gcc -E -MMD -MP -MT i686-pc-mingw32/rt/arch/i386/morestack.o -MF i686-pc-mingw32/rt/arch/i386/morestack.d /home/cmr/hacking/rust/src/rt/arch/i386/morestack.S | /home/cmr/hacking/rust/build/x86_64-unknown-linux-gnu/llvm/Release+Asserts/bin/llvm-mc -assemble -filetype=obj -triple=i686-pc-mingw32 -o=i686-pc-mingw32/rt/arch/i386/morestack.o
/home/cmr/hacking/rust/src/rt/arch/i386/morestack.S:3:19: error: unexpected token in directive
.section .note.GNU-stack, "", @progbits
                  ^
/home/cmr/hacking/rust/src/rt/arch/i386/morestack.S:90:2: error: unknown directive
 .hidden __morestack
 ^
/home/cmr/hacking/rust/src/rt/arch/i386/morestack.S:98:8: error: expected absolute expression
 .type __morestack,@function
       ^
/home/cmr/hacking/rust/mk/rt.mk:93: recipe for target 'i686-pc-mingw32/rt/arch/i386/morestack.o' failed
make: *** [i686-pc-mingw32/rt/arch/i386/morestack.o] Error 1

[emberian]

This makes me think it's just wrongness.

[emberian]

To reproduce: ./configure --target=i686-pc-mingw32,x86_64-unknown-linux-gnu; make

[bharrisau]

Also #11312, llvm-mc is borking on some of the assembly.

[mvdnes]

When using the tripple i686-pc-mingw32, I get the same error.

In addition, for i686-w64-mingw32 (of which I am unsure if it supported, but tried anyway) I get the following output:

make[1]: Leaving directory `/home/mvdnes/rust/src/compiler-rt'
cp: i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/libcompiler-rt.a
compile: i686-w64-mingw32/rt/rust_builtin.o
compile: i686-w64-mingw32/rt/rust_android_dummy.o
compile: i686-w64-mingw32/rt/rust_test_helpers.o
compile: i686-w64-mingw32/rt/rust_try.o
compile: i686-w64-mingw32/rt/arch/i386/record_sp.o
link: i686-w64-mingw32/rt/rustrt.lib
touch i686-w64-mingw32/rt/backtrace.lib
oxidize: i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/libstd
error: linking with `i686-w64-mingw32-g++` failed: exit code: 1
note: i686-w64-mingw32-g++ arguments: '-m32' '-L/home/mvdnes/rust/i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib' '-o' 'i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std-31b43f22-0.10-pre.dll' 'i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o' '-lmorestack' 'i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.metadata.o' '-shared-libgcc' '-Li686-w64-mingw32/rt' '-L.' '-L/home/mvdnes/rust/.rust' '-L/home/mvdnes/rust' '-lrustrt' '-lgcc_s' '-shared' '-lcompiler-rt'
note: i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0xd14): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x1e26): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x2426): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x2cdd): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x44a2): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x585d): more undefined references to `__Unwind_Resume' follow
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x8f284): undefined reference to `__Unwind_RaiseException'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x8f2fd): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x8f307): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x8f518): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x8f522): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x8f728): undefined reference to `__Unwind_Resume'
i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o:(.text+0x93616): more undefined references to `__Unwind_Resume' follow
/usr/bin/i686-w64-mingw32-ld: i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/std.o: bad reloc address 0x14 in section `.data'
collect2: ld returned 1 exit status

error: aborting due to previous error
make: *** [i686-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/stamp.std] Error 101

[emberian]

Nothing in the mingw-w64 distribution provides that symbol, and compiler-rt doesn't seem to either. What I get today:

PATH=/home/cmr/src/rust3/build/x86_64-unknown-linux-gnu/stage2/lib:$PATH   x86_64-unknown-linux-gnu/stage2/bin/rustc --cfg stage2  -O --cfg rtopt --cfg debug -C rpath  --target=i686-w64-mingw32 -C linker=i686-w64-mingw32-g++ -C ar=i686-w64-mingw32-ar   -D warnings -L "i686-w64-mingw32/rt" -L "" -L ""  --out-dir x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib -C extra-filename=-4e7c5e5c /home/cmr/src/rust3/src/librustrt/lib.rs
error: linking with `i686-w64-mingw32-g++` failed: exit code: 1
note: i686-w64-mingw32-g++ '-m32' '-L' '/home/cmr/src/rust3/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib' '-o' 'x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt-4e7c5e5c.dll' 'x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o' '-Wl,--whole-archive' '-lmorestack' '-Wl,--no-whole-archive' 'x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.metadata.o' '-shared-libgcc' '-Wl,--enable-long-section-names' '/home/cmr/src/rust3/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/libcollections-4e7c5e5c.rlib' '/home/cmr/src/rust3/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/libunicode-4e7c5e5c.rlib' '/home/cmr/src/rust3/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/liballoc-4e7c5e5c.rlib' '/home/cmr/src/rust3/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/liblibc-4e7c5e5c.rlib' '/home/cmr/src/rust3/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/libcore-4e7c5e5c.rlib' '-L' 'i686-w64-mingw32/rt' '-L' '.' '-L' '/home/cmr/.rust/lib' '-L' '/home/cmr/src/rust3/build/.rust' '-L' '/home/cmr/src/rust3/build' '-L' '/home/cmr/.rust' '-Wl,-Bdynamic' '-lgcc_s' '-Wl,-Bstatic' '-lrustrt_native' '-Wl,-Bdynamic' '-shared' '-lcompiler-rt'
note: x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x31): undefined reference to `__gcc_personality_v0'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0xcb5): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0xcbd): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0xde6): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0xeb7): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x1a0b): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x1eec): more undefined references to `_Unwind_Resume' follow
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x6dd3): undefined reference to `_Unwind_RaiseException'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x6e8f): undefined reference to `__gcc_personality_v0'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x70de): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x7578): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x7a4f): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x7b04): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x7dbf): undefined reference to `_Unwind_Resume'
x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o:(.text+0x7e37): more undefined references to `_Unwind_Resume' follow
/usr/lib/gcc/i686-w64-mingw32/4.9.0/../../../../i686-w64-mingw32/bin/ld: x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/rustrt.o: bad reloc address 0x4 in section `.data'
collect2: error: ld returned 1 exit status

error: aborting due to previous error
/home/cmr/src/rust3/mk/target.mk:166: recipe for target 'x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/stamp.rustrt' failed
make: *** [x86_64-unknown-linux-gnu/stage2/lib/rustlib/i686-w64-mingw32/lib/stamp.rustrt] Error 101

[emberian]

cc @klutzy @vadimcn

[emberian]

The _Unwind_SjLj_Resume symbol is defined, should we be using that instead?

[bharrisau]

Anything like this? http://stackoverflow.com/a/22774664

[emberian]

Compiling a C++ program that uses exceptions uses __Unwind_SjLj_Resume, it's possible the mingw-w64 that Arch ships was built with sjlj instead of dwarf/seh.

[emberian]

@bharrisau related but not quite the same, I think.

[emberian]

The Arch pkgbuild indeed uses --disable-dw2-exceptions

[klutzy]

LLVM is converting resume instruction into call _Unwind_Resume which is not available if mingw-w64 package uses sjlj configuration.
I don't know what is clear way to fix this. We may fix llvm to emit _Unwind_SjLj_Resume for certain setting (LLVM currently does for iOS setting), but I don't even know if rust's unwinding works well in sjlj..