* Preferentially use the stdenv clang if it is new enough to produce
arm64e binaries; and
* Fix incompatible function pointer conversions (results in an error
with clang 16).
With all libcs I'm aware of, libdl is now either empty (Glibc, musl,
uclibc, illumos), a symlink to libc or equivalent (Apple), or does not
exist (FreeBSD, NetBSD). So explicitly linking libdl now does nothing
for the former platforms, and breaks the build for the latter
platforms.
With this patch I've removed -ldl from all overridden linker flags for
all free packages in Nixpkgs. Everything still seems to build.
Currently when cross compiling the `buildPackages.libredirect` has the wrong dynamic library extension.
To reproduce the issue run something like:
```
file $(nix-build -A pkgsCross.mingwW64.buildPackages.libredirect)/lib/libredirect.dll
/nix/store/80llmqa9lkabg3qnmglngzz22fwf739q-libredirect-0/lib/libredirect.dll: Mach-O 64-bit dynamically linked shared library x86_64
```
or
```
nix-diff $(nix-instantiate -A libredirect) $(nix-instantiate -A pkgsCross.mingwW64.buildPackages.libredirect)
```
macOS's dyld can be rather picky as to what dylib it accepts. This
even changes across macOS versions. Therefore we now build a fat
dylib with all three architectures (x86_64, arm64, arm64e). This
should then be compatible with pretty much any macOS's dyld.
This allows to simplify the usage of libredirect inside of nix build
sandboxes. Add "libredirect.hook" to the build inputs to get everything
linked in automaticall. All that's left is to set NIX_REDIRECTS and call
the target program.
This is just a sanity check on whether the library correctly wraps the
syscalls and it's using the "true" executable for posix_spawn() and
execv().
The installCheckPhase is not executed if we are cross-compiling, so this
shouldn't break cross-compilation.
One thing I'm not actually sure is whether ${coreutils}/bin/true is
universally available on all the platforms, nor whether all the
functions we use in the test are available, but we can still fix that
after we've found out about that.
Signed-off-by: aszlig <aszlig@nix.build>
This is to make sure we get the correct shared library suffix of the
target platform. While for example on Darwin it would even work with the
hardcoded .so prefix it's IMHO a bit nicer to have the actual native
extension.
Signed-off-by: aszlig <aszlig@nix.build>
The library can be used also on Darwin using it like this:
NIX_REDIRECTS='foo=bar' \
DYLD_INSERT_LIBRARIES=${libredirect}/lib/libredirect.so \
DYLD_FORCE_FLAT_NAMESPACE=1 \
some_program
So let's actually not hardcade gcc and add Darwin to meta.platforms.
No other changes seem to be required.
Signed-off-by: aszlig <aszlig@nix.build>
HipChat (or rather its copy of Qt) expects to find keyboard data in
/usr/share/X11/xkb. So use a LD_PRELOAD library to intercept and
rewrite the Glibc calls that access those paths. We've been doing the
same thing with packages like Spotify, but now this functionality has
been abstracted into a reusable library, libredirect.so. It uses an
environment variable $NIX_REDIRECTS containing a colon-separated list
of path prefixes to be rewritten, e.g. "/foo=bar:/xyzzy=/fnord".
