From LibreSSL versions 3.2.1 through 3.4.0, our configure script
would conclude that TLSv1.3 as supported, but it actually wasn't.
This led to annoying breakage like #40128 and #40445.
Now we give an error message if we try to build with one of those
versions.
Closes#40511.
Previously the logic was reversed, and always gave the wrong answer.
This has no other effect than to change whether we suppress
deprecated API warnings.
Fixes#40429; bugfix on 0.3.5.13.
We can't do this in the C headers, since by the time we include
`opensslv.h` in order to check the openssl version number, we will
have included `openssl/macros.h`, which is the thing that checks
whether we disabled deprecation warnings.
This macro defers to __attribute__((fallthrough)) on GCC (and
clang). Previously we had been using GCC's magic /* fallthrough */
comments, but clang very sensibly doesn't accept those.
Since not all compiler recognize it, we only define it when our
configure script detects that it works.
Part of a fix for 34078.
We now accumulate warning flags in a separate variable,
"TOR_WARNING_FLAGS", and write it to a "warning_flags" file. Then
we test whether the compiler will accept "@warning_flags": if so, we
put "@warning_flags" in the CFLAGS; if not, we copy the contents of
"$TOR_WARNING_FLAGS" into the CFLAGS.
Closes ticket 28924.
This is no longer necessary with upstream rust-lang/rust changes as well
as some local tweaks. Namely:
* The `-fsanitize=address`-style options are now passed via `-C
link-args` through `RUSTFLAGS`. This obviates the need for the shell
script.
* The `-C default-linker-libraries`, disabling `-nodefaultlibs`, is
passed through `RUSTFLAGS`, which is necessary to ensure that
`-fsanitize=address` links correctly.
* The `-C linker` option is passed to ensure we're using the same C
compiler as normal C code, although it has a bit of hackery to only
get the `gcc` out of `gcc -std=c99`
