The reason that 'ar' can fail with permission denied is that when
link-time optimizations are enabled, rustc copies libraries into a
temporary directory, preserving file permissions, and subsequently
modifies them using 'ar'.
The modification can fail because some package managers may install
libraries in system directories as read-only files, which means the
temporary file also becomes read-only when it is copied.
I have fixed this by giving the temporary file's owner read+write
permissions after the copy.
I have also added a regression test for this issue.
- Removes f128 from the grammar, which is no longer support in rustc
- The fragment modifier is added so it won't parse float suffix as a separate token
It's a rather useful syntax, and non-obvious.
A friend of mine is learning Rust and was trying to find a way to easily do such an initialization — he couldn't find it in the guide and was pretty surprised when I showed him. Looks like something that should be mentioned.
r? @steveklabnik
This PR makes rustc emit debug locations for *all* call and invoke statements in LLVM IR, if they are contained within a function that debuginfo is enabled for. This is important because LLVM does not handle the case where a function body containing debuginfo is inlined into another function with debuginfo, but the inlined call statement does not have a debug location. In this case, LLVM will not know where (in terms of source code coordinates) the function was inlined to and we end up with some statements still linked to the source locations in there original, non-inlined function without any indication that they are indeed an inline-copy. Later, when generating DWARF from the IR, LLVM will interpret this as corrupt IR and abort.
Unfortunately, the undesirable case described above can still occur when using LTO. If there is a crate compiled without debuginfo calling into a crate compiled with debuginfo, we again end up with the conditions triggering the error. This is why some LTO tests still fail with the dreaded assertion, if the standard library was built with debuginfo enabled. That is, `RUSTFLAGS_STAGE2=-g make rustc-stage2` will succeed but `RUSTFLAGS_STAGE2=-g make check` will still fail after this PR has been merged. I will open a separate issue for this problem.
Everyone agreed.
Fix#17078#14248 seems completed, as every src/test/bench/shootout-*.rs are relicensed after acceptation of this PR except:
- shootout-ackermann.rs: obsolete shootout bench
- shootout-fibo.rs: obsolete shootout bench
- shootout-k-nucleotide-pipes.rs: slower that shootout-k-nucleotide-pipes.rs (and not so interesting as a benchmark)
- shootout-pfib.rs: does not seems related to the shootout
@brson OK?
Replaces BTree with BTreeMap and BTreeSet, which are completely new implementations.
BTreeMap's internal Node representation is particularly inefficient at the moment to
make this first implementation easy to reason about and fairly safe. Both collections
are also currently missing some of the tooling specific to sorted collections, which
is planned as future work pending reform of these APIs. General implementation issues
are discussed with TODOs internally
[breaking-change]
Still waiting on compilation/test/bench stuff locally, but the edit-distance on any errors should be very small at this point. This is ready to be reviewed.
Replaces BTree with BTreeMap and BTreeSet, which are completely new implementations.
BTreeMap's internal Node representation is particularly inefficient at the moment to
make this first implementation easy to reason about and fairly safe. Both collections
are also currently missing some of the tooling specific to sorted collections, which
is planned as future work pending reform of these APIs. General implementation issues
are discussed with TODOs internally
Perf results on x86_64 Linux:
test treemap::bench::find_rand_100 ... bench: 76 ns/iter (+/- 4)
test treemap::bench::find_rand_10_000 ... bench: 163 ns/iter (+/- 6)
test treemap::bench::find_seq_100 ... bench: 77 ns/iter (+/- 3)
test treemap::bench::find_seq_10_000 ... bench: 115 ns/iter (+/- 1)
test treemap::bench::insert_rand_100 ... bench: 111 ns/iter (+/- 1)
test treemap::bench::insert_rand_10_000 ... bench: 996 ns/iter (+/- 18)
test treemap::bench::insert_seq_100 ... bench: 486 ns/iter (+/- 20)
test treemap::bench::insert_seq_10_000 ... bench: 800 ns/iter (+/- 15)
test btree::map::bench::find_rand_100 ... bench: 74 ns/iter (+/- 4)
test btree::map::bench::find_rand_10_000 ... bench: 153 ns/iter (+/- 5)
test btree::map::bench::find_seq_100 ... bench: 82 ns/iter (+/- 1)
test btree::map::bench::find_seq_10_000 ... bench: 108 ns/iter (+/- 0)
test btree::map::bench::insert_rand_100 ... bench: 220 ns/iter (+/- 1)
test btree::map::bench::insert_rand_10_000 ... bench: 620 ns/iter (+/- 16)
test btree::map::bench::insert_seq_100 ... bench: 411 ns/iter (+/- 12)
test btree::map::bench::insert_seq_10_000 ... bench: 534 ns/iter (+/- 14)
BTreeMap still has a lot of room for optimization, but it's already beating out TreeMap on most access patterns.
[breaking-change]
The sentence "The new iterator `filter()` produces returns only the elements that that closure returned `true` for:" can be structured as:
"The new iterator `filter()` produces only the elements that that closure returned `true` for:"
or as:
"The new iterator `filter()` returns only the elements that that closure returned `true` for:"
however, not both.
I went with "produces", since it then talks about returning true and having "return" so close together doesn't sound nice.
r @steveklabnik ?
This makes it easier to experiment with improved quasiquoting as an ordinary
plugin library.
The list of quote macros in feature_gate.rs was already out of sync;
this commit also prevents that problem in the future.
Modify the system %PATH% environment variable instead of the current
user's %PATH% environment. The current user will be an admin user
that may not be the same user who originally started the installer.
Closes#17570.
