[WIP] fix libunwind by aleksmelnikov · Pull Request #62622 · rust-lang/rust

aleksmelnikov · 2019-07-12T12:49:20Z

fix compilation panic=abort for target i686-pc-windows-gnu on linux with w64-mingw32-gcc linker

rust-highfive · 2019-07-12T12:49:30Z

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

rust-highfive · 2019-07-12T15:18:09Z

The job mingw-check of your PR failed (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

2019-07-12T13:23:04.5504936Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-07-12T13:23:04.5747754Z ##[command]git config gc.auto 0
2019-07-12T13:23:04.5822399Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-07-12T13:23:04.5877988Z ##[command]git config --get-all http.proxy
2019-07-12T13:23:04.6000832Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/62622/merge:refs/remotes/pull/62622/merge
---
2019-07-12T13:23:39.0039134Z do so (now or later) by using -b with the checkout command again. Example:
2019-07-12T13:23:39.0039521Z 2019-07-12T13:23:39.0039902Z git checkout -b <new-branch-name>
2019-07-12T13:23:39.0040075Z 2019-07-12T13:23:39.0040224Z HEAD is now at d31a4604d Merge 60ddabbdcb102987b090d46358f2a56820a3b562 into cd1381e91ff4889616eb0c87bf3c321ea2697d42
2019-07-12T13:23:39.0163437Z ##[section]Starting: Collect CPU-usage statistics in the background
2019-07-12T13:23:39.0165776Z ==============================================================================
2019-07-12T13:23:39.0165837Z Task : Bash
2019-07-12T13:23:39.0165872Z Description : Run a Bash script on macOS, Linux, or Windows
---
2019-07-12T13:23:39.5452314Z 320 ./src/librustc/mir
2019-07-12T13:23:39.5452529Z sort: write failed: 'standard output': Broken pipe
2019-07-12T13:23:39.5452606Z sort: write error
2019-07-12T13:23:39.5527611Z ##[section]Finishing: Show disk usage
2019-07-12T13:23:39.5574351Z ##[section]Starting: Disable git automatic line ending conversion (on C:/)
2019-07-12T13:23:39.5576299Z Task : Bash
2019-07-12T13:23:39.5576334Z Description : Run a Bash script on macOS, Linux, or Windows
2019-07-12T13:23:39.5576368Z Version : 3.151.2
2019-07-12T13:23:39.5576408Z Author : Microsoft Corporation
2019-07-12T13:23:39.5576408Z Author : Microsoft Corporation
2019-07-12T13:23:39.5576445Z Help : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/bash
2019-07-12T13:23:39.5576484Z ==============================================================================
2019-07-12T13:23:39.6824903Z Generating script.
2019-07-12T13:23:39.6837121Z Script contents:
2019-07-12T13:23:39.6837465Z git config --replace-all --global core.autocrlf false
2019-07-12T13:23:39.6854699Z ========================== Starting Command Output ===========================
2019-07-12T13:23:39.6874797Z [command]/bin/bash --noprofile --norc /home/vsts/work/_temp/e870fcd2-691c-4e34-8e93-bbd7d5282b0e.sh
2019-07-12T13:23:39.7000563Z ##[section]Finishing: Disable git automatic line ending conversion (on C:/)
2019-07-12T13:23:39.7037067Z ==============================================================================
2019-07-12T13:23:39.7037153Z Task : Bash
2019-07-12T13:23:39.7037190Z Description : Run a Bash script on macOS, Linux, or Windows
2019-07-12T13:23:39.7037225Z Version : 3.151.2
---
2019-07-12T13:25:35.4735380Z Attempting with retry: curl -y 30 -Y 10 --connect-timeout 30 -f -L -C - -o /tmp/rustci_docker_cache https://.s3.amazonaws.com/docker/a4940e6914a5e1f6360ebc241d0d850aff083be5c43d268fd716ce48f63cb24e84238becb662f27f8c5d7740413ca17da24bb9cdc003ef32d7b03d2c9052b94d
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2019-07-12T13:25:41.5107201Z % Total % Received % Xferd Average Speed Time Time Time Current
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2019-07-12T13:25:45.5219390Z % Total % Received % Xferd Average Speed Time Time Time Current
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2019-07-12T13:25:45.5219963Z 2019-07-12T13:25:45.5219963Z 2019-07-12T13:25:45.5263766Z 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0curl: (6) Could not resolve host: .s3.amazonaws.com
2019-07-12T13:25:45.5270251Z The command has failed after 5 attempts.
2019-07-12T13:25:45.6508523Z open /tmp/rustci_docker_cache: no such file or directory
2019-07-12T13:25:45.6531219Z Attempting with retry: docker build --rm -t rust-ci -f /home/vsts/work/1/s/src/ci/docker/mingw-check/Dockerfile /home/vsts/work/1/s/src/ci/docker
2019-07-12T13:25:45.8572807Z Sending build context to Docker daemon 521.7kB
2019-07-12T13:25:45.8573538Z 2019-07-12T13:25:45.8760034Z Step 1/6 : FROM ubuntu:16.04
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2019-07-12T13:26:00.9260522Z Reading package lists...
2019-07-12T13:26:01.7723728Z Reading package lists...
2019-07-12T13:26:01.9127270Z Building dependency tree...
2019-07-12T13:26:01.9127465Z Reading state information...
2019-07-12T13:26:02.0142588Z The following additional packages will be installed:
2019-07-12T13:26:02.0154962Z binutils binutils-mingw-w64-i686 binutils-mingw-w64-x86-64 bzip2 cmake-data
2019-07-12T13:26:02.0156333Z cpp cpp-5 dpkg-dev g++-5 g++-mingw-w64 g++-mingw-w64-i686
2019-07-12T13:26:02.0158009Z g++-mingw-w64-x86-64 gcc gcc-5 gcc-mingw-w64 gcc-mingw-w64-base
2019-07-12T13:26:02.0159682Z gcc-mingw-w64-i686 gcc-mingw-w64-x86-64 git-man libarchive13 libasan2
2019-07-12T13:26:02.0160761Z libasn1-8-heimdal libatomic1 libbabeltrace-ctf1 libbabeltrace1 libbz2-1.0
2019-07-12T13:26:02.0163279Z libdpkg-perl liberror-perl libexpat1 libffi6 libgcc-5-dev libgdbm3
2019-07-12T13:26:02.0164553Z libglib2.0-0 libgmp10 libgnutls30 libgomp1 libgssapi-krb5-2
2019-07-12T13:26:02.0165138Z libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
2019-07-12T13:26:02.0172201Z libheimntlm0-heimdal libhogweed4 libhx509-5-heimdal libicu55 libidn11
2019-07-12T13:26:02.0172201Z libheimntlm0-heimdal libhogweed4 libhx509-5-heimdal libicu55 libidn11
2019-07-12T13:26:02.0172571Z libisl15 libitm1 libjsoncpp1 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
2019-07-12T13:26:02.0176961Z libkrb5-3 libkrb5support0 libldap-2.4-2 liblsan0 liblzo2-2 libmagic1 libmpc3
2019-07-12T13:26:02.0177381Z libmpdec2 libmpfr4 libmpx0 libnettle6 libp11-kit0 libperl5.22
2019-07-12T13:26:02.0177789Z libpython2.7-minimal libpython2.7-stdlib libpython3.5 libpython3.5-minimal
2019-07-12T13:26:02.0180151Z libpython3.5-stdlib libquadmath0 libroken18-heimdal librtmp1 libsasl2-2
2019-07-12T13:26:02.0180679Z libsasl2-modules-db libsqlite3-0 libssl1.0.0 libstdc++-5-dev libtasn1-6
2019-07-12T13:26:02.0180894Z libtsan0 libubsan0 libwind0-heimdal libxml2 linux-libc-dev mime-support
2019-07-12T13:26:02.0181178Z mingw-w64-common mingw-w64-i686-dev mingw-w64-x86-64-dev openssl patch perl
2019-07-12T13:26:02.0181388Z perl-modules-5.22 python2.7-minimal zlib1g-dev
2019-07-12T13:26:02.0181432Z Suggested packages:
2019-07-12T13:26:02.0181853Z binutils-doc bzip2-doc codeblocks eclipse ninja-build cpp-doc gcc-5-locales
2019-07-12T13:26:02.0182076Z debian-keyring g++-multilib g++-5-multilib gcc-5-doc libstdc++6-5-dbg
2019-07-12T13:26:02.0182287Z gcc-multilib manpages-dev autoconf automake libtool flex bison gcc-doc
2019-07-12T13:26:02.0182768Z libasan2-dbg liblsan0-dbg libtsan0-dbg libubsan0-dbg libcilkrts5-dbg
2019-07-12T13:26:02.0183134Z libmpx0-dbg libquadmath0-dbg gdb-doc gettext-base git-daemon-run
2019-07-12T13:26:02.0183134Z libmpx0-dbg libquadmath0-dbg gdb-doc gettext-base git-daemon-run
2019-07-12T13:26:02.0185284Z | git-daemon-sysvinit git-doc git-el git-email git-gui gitk gitweb git-arch
2019-07-12T13:26:02.0185590Z git-cvs git-mediawiki git-svn lrzip glibc-doc gnutls-bin krb5-doc krb5-user
2019-07-12T13:26:02.0185850Z libstdc++-5-doc make-doc wine wine64 ed diffutils-doc perl-doc
2019-07-12T13:26:02.0186144Z libterm-readline-gnu-perl | libterm-readline-perl-perl python2.7-doc
2019-07-12T13:26:02.0186347Z binfmt-support
2019-07-12T13:26:02.0186395Z Recommended packages:
2019-07-12T13:26:02.0186633Z build-essential fakeroot libalgorithm-merge-perl gfortran-mingw-w64
2019-07-12T13:26:02.0186928Z gnat-mingw-w64 libc-dbg gdbserver less rsync ssh-client manpages
2019-07-12T13:26:02.0187171Z manpages-dev libfile-fcntllock-perl libglib2.0-data shared-mime-info
2019-07-12T13:26:02.0187413Z xdg-user-dirs krb5-locales libsasl2-modules libssl-doc xml-core netbase
2019-07-12T13:26:02.0187518Z rename
2019-07-12T13:26:02.0187884Z The following NEW packages will be installed:
2019-07-12T13:26:02.0188119Z binutils binutils-mingw-w64-i686 binutils-mingw-w64-x86-64 bzip2
2019-07-12T13:26:02.0188409Z ca-certificates cmake cmake-data cpp cpp-5 curl dpkg-dev file g++ g++-5
2019-07-12T13:26:02.0190535Z g++-mingw-w64 g++-mingw-w64-i686 g++-mingw-w64-x86-64 gcc gcc-5
2019-07-12T13:26:02.0191178Z gcc-mingw-w64 gcc-mingw-w64-base gcc-mingw-w64-i686 gcc-mingw-w64-x86-64 gdb
2019-07-12T13:26:02.0191577Z git git-man libarchive13 libasan2 libasn1-8-heimdal libatomic1
2019-07-12T13:26:02.0191774Z libbabeltrace-ctf1 libbabeltrace1 libc-dev-bin libc6-dev libcc1-0
2019-07-12T13:26:02.0192222Z libffi6 libgcc-5-dev libgdbm3 libglib2.0-0 libgmp10 libgnutls30 libgomp1
2019-07-12T13:26:02.0192419Z libgssapi-krb5-2 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
2019-07-12T13:26:02.0192738Z libheimntlm0-heimdal libhogweed4 libhx509-5-heimdal libicu55 libidn11
2019-07-12T13:26:02.0192989Z libisl15 libitm1 libjsoncpp1 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
2019-07-12T13:26:02.0192989Z libisl15 libitm1 libjsoncpp1 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
2019-07-12T13:26:02.0193192Z libkrb5-3 libkrb5support0 libldap-2.4-2 liblsan0 liblzo2-2 libmagic1 libmpc3
2019-07-12T13:26:02.0193390Z libmpdec2 libmpfr4 libmpx0 libnettle6 libp11-kit0 libperl5.22
2019-07-12T13:26:02.0193641Z libpython2.7-minimal libpython2.7-stdlib libpython3.5 libpython3.5-minimal
2019-07-12T13:26:02.0193838Z libpython3.5-stdlib libquadmath0 libroken18-heimdal librtmp1 libsasl2-2
2019-07-12T13:26:02.0194032Z libsasl2-modules-db libsqlite3-0 libssl-dev libssl1.0.0 libstdc++-5-dev
2019-07-12T13:26:02.0194682Z libtasn1-6 libtsan0 libubsan0 libwind0-heimdal libxml2 linux-libc-dev make
2019-07-12T13:26:02.0194929Z mime-support mingw-w64 mingw-w64-common mingw-w64-i686-dev
2019-07-12T13:26:02.0195170Z mingw-w64-x86-64-dev openssl patch perl perl-modules-5.22 pkg-config
2019-07-12T13:26:02.0195477Z python2.7 python2.7-minimal sudo xz-utils zlib1g-dev
2019-07-12T13:26:02.0195531Z The following packages will be upgraded:
2019-07-12T13:26:02.3238280Z 1 upgraded, 112 newly installed, 0 to remove and 4 not upgraded.
2019-07-12T13:26:02.3238959Z Need to get 187 MB of archives.
2019-07-12T13:26:02.3239070Z After this operation, 968 MB of additional disk space will be used.
2019-07-12T13:26:02.3239811Z Get:1 http://archive.ubuntu.com/ubuntu xenial/main amd64 libgdbm3 amd64 1.8.3-13.1 [16.9 kB]
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2019-07-12T13:26:49.3899859Z Get:97 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 zlib1g-dev amd64 1:1.2.8.dfsg-2ubuntu4.1 [168 kB]
2019-07-12T13:26:49.5024230Z Get:98 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 libssl-dev amd64 1.0.2g-1ubuntu4.15 [1344 kB]
2019-07-12T13:26:50.4765077Z Get:99 http://archive.ubuntu.com/ubuntu xenial/main amd64 pkg-config amd64 0.29.1-0ubuntu1 [45.0 kB]
2019-07-12T13:26:50.5104970Z Get:100 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 python2.7 amd64 2.7.12-1ubuntu0~16.04.4 [224 kB]
2019-07-12T13:26:50.6740314Z Get:101 http://archive.ubuntu.com/ubuntu xenial/universe amd64 binutils-mingw-w64-i686 amd64 2.26-3ubuntu1+6.6 [1782 kB]
2019-07-12T13:26:52.0164860Z Get:102 http://archive.ubuntu.com/ubuntu xenial/universe amd64 binutils-mingw-w64-x86-64 amd64 2.26-3ubuntu1+6.6 [2029 kB]
2019-07-12T13:26:52.4659482Z Get:103 http://archive.ubuntu.com/ubuntu xenial/universe amd64 mingw-w64-common all 4.0.4-2 [4787 kB]
2019-07-12T13:26:52.8127621Z Get:104 http://archive.ubuntu.com/ubuntu xenial/universe amd64 mingw-w64-i686-dev all 4.0.4-2 [2059 kB]
2019-07-12T13:26:52.9883783Z Get:105 http://archive.ubuntu.com/ubuntu xenial/universe amd64 gcc-mingw-w64-base amd64 5.3.1-8ubuntu3+17 [11.2 kB]
2019-07-12T13:26:52.9889635Z Get:106 http://archive.ubuntu.com/ubuntu xenial/universe amd64 gcc-mingw-w64-i686 amd64 5.3.1-8ubuntu3+17 [27.3 MB]
2019-07-12T13:27:09.1968749Z Get:107 http://archive.ubuntu.com/ubuntu xenial/universe amd64 g++-mingw-w64-i686 amd64 5.3.1-8ubuntu3+17 [19.8 MB]
2019-07-12T13:27:22.8656556Z Get:108 http://archive.ubuntu.com/ubuntu xenial/universe amd64 mingw-w64-x86-64-dev all 4.0.4-2 [3238 kB]
2019-07-12T13:27:24.9775567Z Get:109 http://archive.ubuntu.com/ubuntu xenial/universe amd64 gcc-mingw-w64-x86-64 amd64 5.3.1-8ubuntu3+17 [27.4 MB]
2019-07-12T13:27:43.4764527Z Get:110 http://archive.ubuntu.com/ubuntu xenial/universe amd64 g++-mingw-w64-x86-64 amd64 5.3.1-8ubuntu3+17 [20.4 MB]
2019-07-12T13:27:57.8562438Z Get:111 http://archive.ubuntu.com/ubuntu xenial/universe amd64 g++-mingw-w64 all 5.3.1-8ubuntu3+17 [10.7 kB]
2019-07-12T13:27:57.8566703Z Get:112 http://archive.ubuntu.com/ubuntu xenial/universe amd64 gcc-mingw-w64 all 5.3.1-8ubuntu3+17 [10.7 kB]
2019-07-12T13:27:57.8572932Z Get:113 http://archive.ubuntu.com/ubuntu xenial/universe amd64 mingw-w64 all 4.0.4-2 [9274 B]
2019-07-12T13:27:58.4254798Z debconf: delaying package configuration, since apt-utils is not installed
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2019-07-12T13:27:58.5226915Z (Reading database ... 2019-07-12T13:27:58.5227277Z (Reading database ... 5%
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2019-07-12T13:28:38.0562204Z Unpacking git (1:2.7.4-0ubuntu1.6) ...
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2019-07-12T13:29:17.7149206Z update-alternatives: warning: skip creation of /usr/bin/i686-w64-mingw32-gcc-5 because associated file /usr/bin/i686-w64-mingw32-gcc-5-posix (of link group i686-w64-mingw32-gcc) doesn't exist
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2019-07-12T13:29:18.2358458Z Processing triggers for ca-certificates (20170717~16.04.2) ...
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2019-07-12T13:29:19.6961393Z 148 added, 0 removed; done.
2019-07-12T13:29:19.6962478Z Running hooks in /etc/ca-certificates/update.d...
---
2019-07-12T13:29:59.4691238Z Removing intermediate container b11993f0c053
2019-07-12T13:29:59.4692132Z ---> cd21c236655c
2019-07-12T13:29:59.4730948Z Successfully built cd21c236655c
2019-07-12T13:29:59.7195908Z Successfully tagged rust-ci:latest
2019-07-12T13:29:59.8056387Z Built container sha256:cd21c236655cab52cfb896b677c2b042bcaf12ca90420dfd925bd45cd032b093
2019-07-12T13:29:59.8069278Z Uploading finished image to https://.s3.amazonaws.com/docker/a4940e6914a5e1f6360ebc241d0d850aff083be5c43d268fd716ce48f63cb24e84238becb662f27f8c5d7740413ca17da24bb9cdc003ef32d7b03d2c9052b94d
2019-07-12T13:31:20.6039207Z upload failed: - to s3:///docker/a4940e6914a5e1f6360ebc241d0d850aff083be5c43d268fd716ce48f63cb24e84238becb662f27f8c5d7740413ca17da24bb9cdc003ef32d7b03d2c9052b94d Parameter validation failed:
2019-07-12T13:31:20.6039641Z Invalid bucket name "": Bucket name must match the regex "^[a-zA-Z0-9.\-_]{1,255}$"
2019-07-12T13:31:21.6822745Z [CI_JOB_NAME=mingw-check]
2019-07-12T13:31:21.6867865Z Starting sccache server...
2019-07-12T13:31:21.7348140Z configure: processing command line
2019-07-12T13:31:21.7349262Z configure: ---
2019-07-12T13:37:23.2356154Z configure: build.locked-deps := True
2019-07-12T13:37:23.2356195Z configure: llvm.ccache := sccache
2019-07-12T13:37:23.2356915Z configure: build.cargo-native-static := True
2019-07-12T13:37:23.2358580Z configure: dist.missing-tools := True
2019-07-12T13:37:23.2358809Z configure: build.configure-args := ['--enable-sccache', '--disable-manage-submodu ...
2019-07-12T13:37:23.2358909Z configure: writing `config.toml` in current directory
2019-07-12T13:37:23.2358945Z configure: 2019-07-12T13:37:23.2359126Z configure: run `python /checkout/x.py --help`
2019-07-12T13:37:23.2359194Z configure: ---
2019-07-12T13:39:12.5533664Z Checking hashbrown v0.4.0
2019-07-12T13:39:12.6007679Z error[E0308]: mismatched types
2019-07-12T13:39:12.6011460Z --> src/libpanic_unwind/gcc.rs:280:67
2019-07-12T13:39:12.6012596Z |
2019-07-12T13:39:12.6014213Z 280 | unsafe extern "C" fn rust_eh_unwind_resume(panic_ctx: *mut u8) -> ! {
2019-07-12T13:39:12.6016205Z | --------------------- ^ expected !, found ()
2019-07-12T13:39:12.6018700Z | |
2019-07-12T13:39:12.6020935Z | this function's body doesn't return
2019-07-12T13:39:12.6024313Z = note: expected type `!`
2019-07-12T13:39:12.6026612Z found type `()`
2019-07-12T13:39:12.6027250Z 2019-07-12T13:39:12.6033205Z error: aborting due to previous error
2019-07-12T13:39:12.6033205Z error: aborting due to previous error
2019-07-12T13:39:12.6033487Z 2019-07-12T13:39:12.6034706Z For more information about this error, try `rustc --explain E0308`.
2019-07-12T13:39:12.6082500Z error: Could not compile `panic_unwind`.
2019-07-12T13:39:13.2465959Z error: build failed
2019-07-12T13:39:13.2465959Z error: build failed
2019-07-12T13:39:13.2490715Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "check" "--target" "i686-pc-windows-gnu" "-j" "2" "--release" "--locked" "--color" "always" "--features" "panic-unwind backtrace compiler-builtins-c" "--manifest-path" "/checkout/src/libstd/Cargo.toml" "--message-format" "json"
2019-07-12T13:39:13.2493870Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap check --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu
2019-07-12T13:39:13.2493942Z Build completed unsuccessfully in 0:00:26
2019-07-12T13:39:13.2493942Z Build completed unsuccessfully in 0:00:26
2019-07-12T13:39:21.4748953Z ##[error]Bash exited with code '1'.
2019-07-12T13:39:21.4785265Z ##[section]Starting: Checkout
2019-07-12T13:39:21.4786860Z ==============================================================================
2019-07-12T13:39:21.4786925Z Task : Get sources
2019-07-12T13:39:21.4786969Z Description : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

alexcrichton · 2019-07-12T18:12:47Z

Thanks for the PR! This PR is unfortunately pretty light on the details. Neither the PR title nor description really gives any insight into what the compilation error looks like today, what this change is, and why the change fixes it. Could you expand the descriptions and/or give more detail about the issues you're encountering?

aleksmelnikov · 2019-07-12T18:14:28Z

Any breaking changes is not what I want it all.
This fix:

to add modules for dwarf2 and sjlj exception types for platforms
move i686-pc-windows-gnu from dwarf2 to sjlj for cross-compiling because mingw package on linux supports sjlj for i686

aleksmelnikov · 2019-07-12T18:16:15Z

#32859

fix compilation panic=abort for target i686-pc-windows-gnu on linux Update libunwind.rs Update libunwind.rs Update libunwind.rs

retep998 · 2019-07-12T21:02:57Z

Rust currently ships i686-pc-windows-gnu with a MinGW toolchain that uses dwarf exception handling, not sjlj. Wouldn't your change conflict with that?

aleksmelnikov · 2019-07-14T18:42:08Z

the first atempt to fixing.

After some more testing, I've discovered this approach will not work with Rust as-shipped, as the pre-compiled stdlib binaries shipped to rustup are compiled on their native platforms. With the way Rust is currently distributed, I don't think fixing this will be possible at the moment (until Xargo functionality is merged into Cargo, most likely).

alexcrichton · 2019-07-15T14:45:43Z

Ok thanks for expanding the description! As you've discovered I don't think this is fixable without rustc changes itself. Even with xargo the compiler needs to configure LLVM and may need to change its codegen for sjlj exceptions.

Do you want to leave this open in the meantime or shall we close this?

aleksmelnikov · 2019-07-15T16:43:05Z

@alexcrichton , I do not throw this PR. I look through some more possible solutions. I would like the solution to be as minimal and simple as possible.
I also contacted the debianmingw package mantainer. And it seemed to me he looks at the sjlj more positively than on the dwarf. Why rust choose dwarf2 exception on i686, but not sjlj ?

alexcrichton · 2019-07-15T20:50:41Z

This probably isn't the best place to discuss why architectural design decisions are the way they are in Rust, I'd recommend starting a thread on internals.rust-lang.org for that. I don't think this is an actionable change without more changes to the compiler itself, so I'm inclined to close this while those are settled.

aleksmelnikov · 2019-07-17T18:26:25Z

Probably adding new targets for compile features is not good path.

rust-highfive assigned alexcrichton Jul 12, 2019

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 12, 2019

mati865 reviewed Jul 12, 2019
View reviewed changes

Comment threadsrc/libunwind/libunwind.rs Outdated

fix libunwind
279c35f
fix compilation panic=abort for target i686-pc-windows-gnu on linux Update libunwind.rs Update libunwind.rs Update libunwind.rs

superriva added 4 commits July 14, 2019 18:12

Update libunwind.rs
d3f24f7

Create i686_unknown_windows_gnu
b7bb5f5

Update mod.rs
fa6d77d

Rename i686_unknown_windows_gnu to i686_unknown_windows_gnu.rs
95cc7ef

aleksmelnikov changed the title ~~fix libunwind~~WIP fix libunwindJul 15, 2019

aleksmelnikov changed the title ~~WIP fix libunwind~~[WIP] fix libunwindJul 15, 2019

aleksmelnikov closed this Jul 17, 2019

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[WIP] fix libunwind - #62622

[WIP] fix libunwind#62622
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