After failing to find RUNPATH in the ELF of /usr/bin/env, not finding
the answer in a symlink of the dynamic interpreter, and not finding
libc.so.6 in the same directory as the dynamic interpreter, Zig will
check `/lib/$triple`.
This fixes incorrect native glibc version detected on Debian bookworm.
This is a partial revert of the previous commit, fixing a regression on
Debian. However, the commit additionally improves the
detectAbiAndDynamicLinker function to read more than 1 byte at a time
when detecting a shebang line.
This commit removes the check that takes advantage of when the dynamic
linker is a symlink. Instead, it falls back on the same directory as the
dynamic linker as a de facto runpath. Empirically, this gives correct
results on Gentoo and NixOS.
Unfortunately it is still falling short for Debian, which has libc.so.6
in a different directory as the dynamic linker.
Before, native glibc and dynamic linker detection attempted to use the
executable's own binary if it was dynamically linked to answer both the
C ABI question and the dynamic linker question. However, this could be
problematic on a system that uses a RUNPATH for the compiler binary,
locking it to an older glibc version, while system binaries such as
/usr/bin/env use a newer glibc version. The problem is that libc.so.6
glibc version will match that of the system while the dynamic linker
will match that of the compiler binary. Executables with these versions
mismatching will fail to run.
Therefore, this commit changes the logic to be the same regardless of
whether the compiler binary is dynamically or statically linked. It
inspects `/usr/bin/env` as an ELF file to find the answer to these
questions, or if there is a shebang line, then it chases the referenced
file recursively. If that does not provide the answer, then the function
falls back to defaults.
This commit also solves a TODO to remove an Allocator parameter to the
detect() function.
Previously, this code would fail to detect glibc version because it
relied on libc.so.6 being a symlink which revealed the answer. On modern
distros, this is no longer the case.
This new strategy finds the path to libc.so.6 from /usr/bin/env, then
inspects the .dynstr section of libc.so.6, looking for symbols that
start with "GLIBC_2.". It then parses those as semantic versions and
takes the maximum value as the system-native glibc version.
closes#6469
see #11137closes#12567
This makes `0123` and `u0123` etc. illegal.
I'm now confident that this is a good change because
I actually caught two C header translation mistakes in `haiku.zig` with this.
Clearly, `0123` being octal in C (TIL) can cause confusion, and we make this easier to read by
requiring `0o` as the prefix and now also disallowing leading zeroes in integers.
For consistency and because it looks weird, we disallow it for integer types too (e.g. `u0123`).
Fixes#11963Fixes#12417
`/usr/local/include`, `/usr/local/lib` and `/Library/Frameworks`
have been deprecated since approximately macOS 11, and so to avoid
redundant and misinformed warning messages generated by the linker,
add those dirs only when natively targeting macOS 10.x.x or below.
Since we know the offset, we may as well read starting there. Still expects
rpath to fit in 4096 bytes; that might be worth fixing in the future.
Fixes issue #12112
