Rustc-1.42.0

Installation of Rust

To install into the /opt directory, remove the symlink and create a new directory (i.e. with a different name if trying a modified build). As the root user:

mkdir /opt/rustc-1.42.0             &&
ln -svfin rustc-1.42.0 /opt/rustc

Create a suitable config.toml file which will configure the build.

cat << EOF > config.toml
# see config.toml.example for more possible options
# See the 8.4 book for an example using shipped LLVM
# e.g. if not installing clang, or using a version before 10.0
[llvm]
# by default, rust will build for a myriad of architectures
targets = "X86"

# When using system llvm prefer shared libraries
link-shared = true

[build]
# omit docs to save time and space (default is to build them)
docs = false

# install cargo as well as rust
extended = true

[install]
prefix = "/opt/rustc-1.42.0"
docdir = "share/doc/rustc-1.42.0"

[rust]
channel = "stable"
rpath = false

# BLFS does not install the FileCheck executable from llvm,
# so disable codegen tests
codegen-tests = false

[target.x86_64-unknown-linux-gnu]
# NB the output of llvm-config (i.e. help options) may be
# dumped to the screen when config.toml is parsed.
llvm-config = "/usr/bin/llvm-config"

[target.i686-unknown-linux-gnu]
# NB the output of llvm-config (i.e. help options) may be
# dumped to the screen when config.toml is parsed.
llvm-config = "/usr/bin/llvm-config"


EOF

Compile Rust by running the following commands:

export RUSTFLAGS="$RUSTFLAGS -C link-args=-lffi" &&
python3 ./x.py build --exclude src/tools/miri

To run the tests issue python3 ./x.py test --verbose --no-fail-fast | tee rustc-testlog: as with the build, that will use all available CPUs.

The instructions above do not build ARM compilers, so the testsuite will fail and the tests will be reported to end in error, with a backtrace of the last failing test. On a good run, 3 tests which need Thumb (ARM) compilers will fail, all in ui/issues for issues 37131, 49851 and 50993. A fourth test, run-make-fulldeps/sysroot-crates-are-unstable fails, presumably because we are using only stable features. As with all large testsuites, other tests might fail on some machines - if the number of failures is in the single digits, check the log for 'FAILED' and review lines above that, particularly the 'stderr:' lines. Any mention of SIGSEGV or signal 11 in a failing test is a cause for concern.

If you get any other failing test which reports an issue number then you should search for that issue. For example, when rustc >= 1.41.1 is built with a version of sysllvm before 10.0 the test for issue 69225 fails https://github.com/rust-lang/rust/issues/69225 and that should be regarded as a critical failure (they released 1.41.1 because of it). Most other failures will not be critical.

Therefore, you should determine the number of failures. The total number of tests varies depending on which dependencies are present, e.g. more will be run if gdb is available. If you wish, the total number which were considered can be found if you run:

egrep 'running [[:digit:]]+ test' rustc-testlog | awk '{ sum += $2 } END { print sum }'

More importantly, the total of tests which failed can be found by running:

grep '^test result:' rustc-testlog | awk  '{ sum += $6 } END { print sum }'

And similarly if you care about how many tests passed use $4, for those which were ignored (i.e. skipped) use $8 (and $10 for 'measured', $12 for 'filtered out' but both are probably zero).

Still as your normal user, do a DESTDIR install:

export LIBSSH2_SYS_USE_PKG_CONFIG=1 &&
DESTDIR=${PWD}/install python3 ./x.py install &&
unset LIBSSH2_SYS_USE_PKG_CONFIG

Now, as the root user install the files from the DESTDIR:

chown -R root:root install &&
cp -a install/* /

cat >> /etc/ld.so.conf << EOF
# Begin rustc addition

/opt/rustc/lib

# End rustc addition
EOF

ldconfig

cat > /etc/profile.d/rustc.sh << "EOF"
# Begin /etc/profile.d/rustc.sh

pathprepend /opt/rustc/bin           PATH

# End /etc/profile.d/rustc.sh
EOF

source /etc/profile.d/rustc.sh