rustbuild: Don't enable debuginfo in rustc #38984
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In rust-lang#37280 we enabled line number debugging information in release artifacts, primarily to close out rust-lang#36452 where debugging information was critical for MSVC builds of Rust to be useful in production. This commit, however, apparently had some unfortunate side effects. Namely it was noticed in rust-lang#37477 that if `RUST_BACKTRACE=1` was set then any compiler error would take a very long time for the compiler to exit. The cause of the problem here was somewhat deep: * For all compiler errors, the compiler will `panic!` with a known value. This tears down the main compiler thread and allows cleaning up all the various resources. By default, however, this panic output is suppressed for "normal" compiler errors. * When `RUST_BACKTRACE=1` was set this caused every compiler error to generate a backtrace. * The libbacktrace library hits a pathological case where it spends a very long time in its custom allocation function, `backtrace_alloc`, because the compiler has so much debugging information. More information about this can be found in rust-lang#29293 with a summary at the end of rust-lang#37477. To solve this problem this commit simply removes debuginfo from the compiler but not from the standard library. This should allow us to keep rust-lang#36452 closed while also closing rust-lang#37477. I've measured the difference to be orders of magnitude faster than it was before, so we should see a much quicker time-to-exit after a compile error when `RUST_BACKTRACE=1` is set. Closes rust-lang#37477 Closes rust-lang#37571
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r? @aturon (rust_highfive has picked a reviewer for you, use r? to override) |
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@bors r+ |
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📌 Commit 099e7cb has been approved by |
brson
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Is this bug bag enough to backport a fix? |
I personally would like a backport for IntelliJ Rust. We now provide nice hypelinks for backtraces (for files names( |
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Jan 11, 2017
rustbuild: Don't enable debuginfo in rustc In #37280 we enabled line number debugging information in release artifacts, primarily to close out #36452 where debugging information was critical for MSVC builds of Rust to be useful in production. This commit, however, apparently had some unfortunate side effects. Namely it was noticed in #37477 that if `RUST_BACKTRACE=1` was set then any compiler error would take a very long time for the compiler to exit. The cause of the problem here was somewhat deep: * For all compiler errors, the compiler will `panic!` with a known value. This tears down the main compiler thread and allows cleaning up all the various resources. By default, however, this panic output is suppressed for "normal" compiler errors. * When `RUST_BACKTRACE=1` was set this caused every compiler error to generate a backtrace. * The libbacktrace library hits a pathological case where it spends a very long time in its custom allocation function, `backtrace_alloc`, because the compiler has so much debugging information. More information about this can be found in #29293 with a summary at the end of #37477. To solve this problem this commit simply removes debuginfo from the compiler but not from the standard library. This should allow us to keep #36452 closed while also closing #37477. I've measured the difference to be orders of magnitude faster than it was before, so we should see a much quicker time-to-exit after a compile error when `RUST_BACKTRACE=1` is set. Closes #37477 Closes #37571
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☀️ Test successful - status-appveyor, status-travis |
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@brson I agree that we should backport |
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In #37280 we enabled line number debugging information in release artifacts,
primarily to close out #36452 where debugging information was critical for MSVC
builds of Rust to be useful in production. This commit, however, apparently had
some unfortunate side effects.
Namely it was noticed in #37477 that if
RUST_BACKTRACE=1was set then anycompiler error would take a very long time for the compiler to exit. The cause
of the problem here was somewhat deep:
panic!with a known value. Thistears down the main compiler thread and allows cleaning up all the various
resources. By default, however, this panic output is suppressed for "normal"
compiler errors.
RUST_BACKTRACE=1was set this caused every compiler error to generate abacktrace.
time in its custom allocation function,
backtrace_alloc, because thecompiler has so much debugging information. More information about this can be
found in rustc(with --enable-debuginfo) hangs for 20-45 seconds on errors(of any kind) when RUST_BACKTRACE is set #29293 with a summary at the end of Long delay before exiting after reporting compilation errors in rustc 1.14.0 nightly when RUST_BACKTRACE=1 #37477.
To solve this problem this commit simply removes debuginfo from the compiler but
not from the standard library. This should allow us to keep #36452 closed while
also closing #37477. I've measured the difference to be orders of magnitude
faster than it was before, so we should see a much quicker time-to-exit after a
compile error when
RUST_BACKTRACE=1is set.Closes #37477
Closes #37571