build to asm.js crash

[vmosone]

system env:
windows10 home
mingw64
rustc 1.38.0-nightly-gnu (311376d30 2019-07-18)
cargo-web 0.6.26
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.38.39
clang version 6.0.1 (Cswircachegitchromium.googlesource.com-external-jackfan.us.kg-
emscripten--core-emscripten--fastcomp--clang
98df4be387dde3e3918fa5bbb5fc43e1a0e1daac)
(Cswircachegitchromium.googlesource.com-external-jackfan.us.kg-emscripten--core-
emscripten--fastcomp 1b4148f39a69c7fc62edadd85e4122b68694dfb7) (emscripten 1.38.31 :
1.38.31)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: E:\c\wasm\emsdk\fastcomp\fastcomp\bin

build options
cargo:
[profile.release]
lto = true
opt-level = "z"
panic = 'abort'
codegen-units = 1
emcc:
[target.emscripten]
link-args = [
"-Oz",
"-s", "TOTAL_MEMORY=67108864",
"-s", "ALLOW_MEMORY_GROWTH=0",
"-s", "MALLOC=emmalloc",
"-s", "ELIMINATE_DUPLICATE_FUNCTIONS=1",
"-s", "ENVIRONMENT=web",
"-s", "INLINING_LIMIT=1",
"-s", "NO_FILESYSTEM=1",
]

= note: shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\rust.metadata.bin is not a valid object file for emscripten, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\hal_webgl-a178ef6e0dd0e8f8.118thi2pgc58y3z5.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\hal_webgl-a178ef6e0dd0e8f8.11jm299i1jyfkdc8.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\hal_webgl-a178ef6e0dd0e8f8.11pwyu3ztgzdgjmb.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\hal_webgl-a178ef6e0dd0e8f8.16lcmqiupr9qz214.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\hal_webgl-a178ef6e0dd0e8f8.1ejiw7lxkwvlasau.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\hal_webgl-a178ef6e0dd0e8f8.1f7xdhs77t6ikk23.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\hal_webgl-a178ef6e0dd0e8f8.1ffz8n2mej3jf74t.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_pgeyjm_archive_contents\hal_webgl-a178ef6e0dd0e8f8.1i6wjxhpnjreu8q8.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object

...... too long :p

c:\users\vmos\appdata\local\temp\emscripten_temp_ww7id7_archive_contents\rust.metadata.bin is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_ww7id7_archive_contents\rustc_std_workspace_core-cc70cbbaa89894c0.rustc_std_workspace_core.a4kxsf7w-cgu.0.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_w8ohfl_archive_contents\rust.metadata.bin is not a valid object file for emscripten, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_w8ohfl_archive_contents\core-4f2e694c0e093f88.core.6r9ttild-cgu.0.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_w8ohfl_archive_contents\rust.metadata.bin is not a valid object file for emscripten, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_w8ohfl_archive_contents\core-4f2e694c0e093f88.core.6r9ttild-cgu.0.rcgu.bc.z is not valid according to llvm-nm, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_yozofr_archive_contents\rust.metadata.bin is not a valid object file for emscripten, cannot link
shared:WARNING: object c:\users\vmos\appdata\local\temp\emscripten_temp_yozofr_archive_contents\compiler_builtins-73ffc723908ccf8f.compiler_builtins.8zrwqbk1-cgu.0.rcgu.bc.z is not valid according to llvm-nm, cannot link
Assertion failed: I != Map.end() && "Constant not found in constant table!", file c:\b\s\w\ir\cache\builder\emscripten-releases\emscripten-fastcomp\lib\ir\ConstantsContext.h, line 665
Wrote crash dump file "C:\Users\vmos\AppData\Local\Temp\llc.exe-3c8c19.dmp"
LLVMSymbolizer: error reading file: 'ucrtbase.pdb': LLVM was not compiled with support for DIA. This usually means that you are not using MSVC, or your Visual Studio installation is corrupt.
LLVMSymbolizer: error reading file: 'kernel32.pdb': LLVM was not compiled with support for DIA. This usually means that you are not using MSVC, or your Visual Studio installation is corrupt.
LLVMSymbolizer: error reading file: 'ntdll.pdb': LLVM was not compiled with support for DIA. This usually means that you are not using MSVC, or your Visual Studio installation is corrupt.
#0 0x00007ff76acd32b5 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0xc332b5)
#1 0x00007ff825bdda2d (C:\WINDOWS\System32\ucrtbase.dll+0x6da2d)
#2 0x00007ff825bde901 (C:\WINDOWS\System32\ucrtbase.dll+0x6e901)
#3 0x00007ff825be0261 (C:\WINDOWS\System32\ucrtbase.dll+0x70261)
#4 0x00007ff825be0591 (C:\WINDOWS\System32\ucrtbase.dll+0x70591)
#5 0x00007ff76a858c79 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x7b8c79)
#6 0x00007ff76a8596b3 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x7b96b3)
#7 0x00007ff76a85661e (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x7b661e)
#8 0x00007ff76a855901 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x7b5901)
#9 0x00007ff76a7f6e72 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x756e72)
#10 0x00007ff76ae85973 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0xde5973)
#11 0x00007ff76ae86950 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0xde6950)
#12 0x00007ff76ae87988 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0xde7988)
#13 0x00007ff76a7d087f (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x73087f)
#14 0x00007ff76a7cfc8b (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x72fc8b)
#15 0x00007ff76a0d453f (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x3453f)
#16 0x00007ff76a0d5ead (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0x35ead)
#17 0x00007ff76af47b10 (E:\c\wasm\emsdk\fastcomp\fastcomp\bin\llc.exe+0xea7b10)
#18 0x00007ff826e97974 (C:\WINDOWS\System32\KERNEL32.DLL+0x17974)
#19 0x00007ff829b0a271 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x6a271)
shared:ERROR: 'E:/c/wasm/emsdk/fastcomp/fastcomp/bin\llc.exe C:\Users\vmos\AppData\Local\Temp\emscripten_temp_tjno5i\gui_web-20a98da238689c41.bc -march=js -filetype=asm -o C:\Users\vmos\AppData\Local\Temp\tmpmri51e.4.js -emscripten-stack-size=5242880 -O0 -emscripten-assertions=1 -emscripten-no-aliasing-function-pointers -emscripten-global-base=8 -emscripten-no-exit-runtime' failed (-2147483645)

error: aborting due to previous error
error: build failed

[kripken]

This sounds like a bug in the fastcomp backend. Emscripten is moving to the wasm backend, including for rustc - @tlively is looking at that right now. So hopefully that should be ready soon.

[vmosone]

Thanks for your reply :)

The strange thing is that when I changed the optimization level to 1 or 2, everything returned to normal. e.g
[profile.release]
lto = true
opt-level = 1
panic = 'abort'
codegen-units = 1

Anyway, thanks for your doing.

[kripken]

Ah, nice that it works with different opts :) Yeah, sometimes they happen to change code in a lucky way that avoids a compiler bug like this...