This was added in 2005 back in r51ce4ea2. This was not commented or
explained anywhere, and it does not seem to be necessary anymore
according to some quick testing I did.
Reduces mono closure size by ~100M.
After making `ffmpeg` point to the latest `ffmpeg_4`, all packages that
used `ffmpeg` without requiring a specific version now use ffmpeg_3
explicitly so they shouldn't change.
The idris2 Makefile tries to use different versions of sed depending on
the OS, but nix always uses the same version. Because the version of
sed that is expected on macOS doesn't exist in the nix environment, the
build fails. Setting the OS to empty string resolves the issue.
rls has racer baked in which needs to know where the rust source
is to be able to do completion for std libs. By default rls will use:
$(rustc --print sysroot)/lib/rustlib/src/rust/src
which is nonexistent, this commit sets the correct source path
in a same way like it's done in racer expression.
reasoning:
sjlj (short jump long jump) exception handling makes no sense on x86_64, it's forcably slowing programs down as it produces a constant overhead. On x86_64 we have SEH (Structured Exception Handling) and we should use that. On i686, we do not have SEH, and have to use sjlj with dwarf2. Hence it's now conditional on x86_32
Programs which generate and compile a lot of code at runtime (such as
programming language interpreters like ACL2) are not suited for running on SBCL
executables built with the "immobile space" feature, as explained by Douglas
Katzman in this mail thread:
https://sourceforge.net/p/sbcl/mailman/message/36007057/
In this commit, I add an optional flag to the SBCL package allowing you to
disable the "immobile space" features.
I also migrated away from specifying enabled/disabled features in a
`customize-target-features.lisp` file and towards supplying them as command line
arguments to `make.sh`, as has been recommended by the installation instructions
since 2012 or so.
