Fixes `OUTPUT_VARIABLE`, `ERROR_VARIABLE`.
vcpkg always wants logfiles. CMake (`execute_process`) doesn't send
stdout/stderr to files and variables at the same time, and even "the
precedence is not specified". So simultaneous output has to be handled
in `vcpkg_execute_required_process`.
At this occasion, port the arguments for stripping trailing whitespace.
`tensorflow-common` implicitly relied on the broken behavior. I chose
the minimal fix: drop the pointless calls, just set the empty value.
If a call to `vcpkg_replace_string` makes no changes i.e doesn't
effectively replace a string, A warning is logged.
This should also help identify ports that no longer need these calls to
fix things in `.pc` files etc.
Avoid wrong use of popular but ambiguous variables (`WIN32` etc.) in
scripts and portfiles by detection in CI.
Sometimes the variables are used wrongly, and sometimes this isn't
caught in PR review. This PR tries to catch those variables (when in the
active code path in script mode). [This can happen to every
contributor](https://github.com/microsoft/vcpkg/pull/34356#discussion_r1360074122),
even if he/she knows the rules ... vcpkg is raising the bar higher than
usual, having to deal with targets and hosts even in script mode.
(`b2-options.cmake` (boost fragment) shows where we get if we don't pay
attention: the same code being used in script mode (`WIN32` meaning
host) and in project mode (`WIN32` meaning target).)
The new check doesn't break any user builds because it relies on command
line options. However it changes the ABI hashes.
Fixes#38764, update `7zip` to 24.06.
No feature needs to be tested, the usage test passed on
`x64-windows`(header files found):
```
7zip provides CMake targets:
# this is heuristically generated, and may not be correct
find_package(7zip CONFIG REQUIRED)
target_link_libraries(main PRIVATE 7zip::7zip)
```
msys2-runtime no longer supports Windows 7 since version 3.5.
msys2-runtime-3.4 is the replacement for user who cannot upgrade. YMMV.
autoconf-wrapper is not updated, cf. #36774.
pkgconf is not updated, waiting for 2.2.