Fix backtraces with `-C panic=abort` on linux; emit unwind tables by default

The linux backtrace unwinder relies on unwind tables to work properly,
and generating and printing a backtrace is done by for example the
default panic hook.

Begin emitting unwind tables by default again with `-C panic=abort` (see
history below) so that backtraces work.

History
=======

Backtraces with `-C panic=abort` used to work in Rust 1.22 but broke in
Rust 1.23, because in 1.23 we stopped emitting unwind tables with `-C
panic=abort` (see 24cc38e3b00).

In 1.45 (see cda994633ee) a workaround in the form
of `-C force-unwind-tables=yes` was added.

`-C panic=abort` was added in [Rust
1.10](https://blog.rust-lang.org/2016/07/07/Rust-1.10/#what-s-in-1-10-stable)
and the motivation was binary size and compile time. But given how
confusing that behavior has turned out to be, it is better to make
binary size optimization opt-in with `-C force-unwind-tables=no` rather
than default since the current default breaks backtraces.

Besides, if binary size is a primary concern, there are many other
tricks that can be used that has a higher impact.

1 files changed, 2 insertions, 1 deletions

diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index 25b46241c52..172672a80fb 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -758,7 +758,8 @@ impl Session {
         //     ELF x86-64 abi, but it can be disabled for some compilation units.
         //
         // Typically when we're compiling with `-C panic=abort` we don't need
-        // `uwtable` because we can't generate any exceptions!
+        // `uwtable` because we can't generate any exceptions! But note that
+        // some targets require unwind tables to generate backtraces.
         // Unwind tables are needed when compiling with `-C panic=unwind`, but
         // LLVM won't omit unwind tables unless the function is also marked as
         // `nounwind`, so users are allowed to disable `uwtable` emission.