This change allows to use the `test-{security,symbol}-check.py` scripts
when building out of source tree with no need to link scripts into the
build directory.
```bash
test3.c: In function 'main':
test3.c:6:21: warning: implicit declaration of function 'CoFreeUnusedLibrariesEx' [-Wimplicit-function-declaration]
6 | CoFreeUnusedLibrariesEx(0,0);
```
From what I can see the only platform this drops support for is CentOS
7. CentOS 7 reached the end of it's "full update" support at the end of
2020. It does receive maintenance updates until 2024, however I don't
think supporting glibc 2.17 until 2024 is realistic. Note that anyone
wanting to self-compile and target a glibc 2.17 runtime could build with
--disable-threadlocal.
glibc 2.18 was released in August 2013.
https://sourceware.org/legacy-ml/libc-alpha/2013-08/msg00160.html
These test-*-check scripts should compile "test" binaries in a way that
is as close to what autotools would do, since the goal is to make sure
that if we run the *-check script, they can correctly detect flaws in
binaries which are compiled by our autotools-based system.
Therefore, we should emulate what happens when the binary is linked in
autotools, meaning that for C binaries, we need to supply the CFLAGS,
CPPFLAGS, and LDFLAGS flags in that order.
Note to future developers: perhaps it'd be nice to have these
test-*-check scripts be part of configure.ac to avoid having to manually
replicate autoconf-like behaviour every time we find a discrepancy. Of
course, that would also mean you'd have to write more m4...
Now that our release binaries are build in a glibc 2.24 and 2.27
environment, we can't use a symbol from glibc 2.28 to test our checks.
Replace renameat2() with nextup(), which was introduced in 2.24.
Note that this also means re-disabling the test for RISC-V, however
RISC-V is built in a glibc 2.27 environment, and our minimum required
glibc for that binary is 2.27.
This is important to make sure that we're not testing tools different
from the one we're building with.
Introduce determine_wellknown_cmd, which encapsulates how we
should handle well-known tools specification (IFS splitting, env
override, etc.).
Clangs Darwin driver should infer the SDK version used during compilation, and
forward that through to the linker. Add a check that this has been done, and the
expected SDK version is set.
Should help prevent issues like #21771 in future.
We use linker flags (-Wl,--major/minor-subsystem-version) to set the
minimum required version of Windows needed to run our binaries. This
adds a sanity check that the version is being set as expected.
We use a compile flag (-mmacosx-version-min) to set the minimum required
version of macOS needed to run our binaries. This adds a sanity check
that the version is being set as expected.
Check both failure cases:
- Use a glibc symbol from a version that is too new
- Use a symbol from a library that is not in the allowlist
And also check a conforming binary.
Adding a similar check for Windows PE can be done in a separate PR.
Hennadii Stepanov