890bae524c Do not explicitly report "standard" include directories as implicit
5c171ca898 Restore unconditional use of "standard" include directories
9502276f82 Prefix implicit include directories with sysroot on construction
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !2981
In commit 1293ed8507 (ParseImplicitIncludeInfo: keep implicit incl.
consistent when rerunning cmake, 2019-01-30, v3.14.0-rc1~26^2) we did
not account for `CMAKE_<LANG>_STANDARD_INCLUDE_DIRECTORIES`. This
variable lets platform modules or toolchain files specify directories
that are to be explicitly passed as standard include directories. These
include directories are used by the test project from which we extract
implicit include directories so they appear in the parsed results
whether or not the compiler really considers them implicit. Exclude
these entries from the computed implicit include directories since they
are not actually implied by the compiler when we invoke it with
"standard" include directories passed explicitly.
Instead teach the build system generators to treat the "standard"
directories as implicit for purposes of excluding them from appearing
earlier in the compiler command line due to `include_directories` and
`target_include_directories` calls.
Issue: #18936, #18944
`CMAKE_<LANG>_STANDARD_INCLUDE_DIRECTORIES` is meant to unconditionally
add explicitly specified include directories to compile lines. In
commit 5f34bdc7f9 (cmLocalGenerator: Refactor
`GetIncludeDirectoriesImplicit` method, 2019-01-25, v3.14.0-rc1~65^2~1)
a condition was accidentally added to exclude implicit include
directories. Drop that condition.
Fixes: #18936
Since commit 7cd65c97fa (Add CMAKE_SYSROOT variable to set --sysroot
when cross compiling., 2013-04-13, v3.0.0-rc1~342^2) we have prefixed
the value of `CMAKE_SYSROOT` to implicit include directories. This was
done because we hard-coded `/usr/include` as an implicit include
directory without accounting for the sysroot. Instead we should prefix
the hard-coded paths when they are constructed. Update the
`Platform/UnixPaths` module to do this as `Platform/Darwin` already
does.
Since commit 5990ecb741 (Compute implicit include directories from
compiler output, 2018-12-07, v3.14.0-rc1~108^2) the values of the
`CMAKE_<LANG>_IMPLICIT_INCLUDE_DIRECTORIES` variables are computed from
a real compiler invocation so they already account for the sysroot
prefix. In commit 6fc3382944 (Update logic for sysroot in detected
implicit include directories, 2019-02-13, v3.14.0-rc2~6^2) we attempted
to apply the prefix conditionally, but that is incorrect because the
compiler's real implicit include directories are not all under the
sysroot. Instead assume that all implicit include directories in
`CMAKE_<LANG>_IMPLICIT_INCLUDE_DIRECTORIES` already have the sysroot
prefix if needed. Code that constructs the value must be responsible
for that because it is the only place that knows.
The output is only merged for a step if it is logging to file. This
option is ignored for steps that are logging normally.
A minor grammatical error has also been fixed as part of this change.
After !2853, the statement that the "longest file extension is
always considered" is no longer true. Both NAME_WLE and
LAST_EXT now return details based on the shortest file
extension.
Fixes: 7a25ef326b (Help: Add documentation for new get_filename_component components, 2019-01-24, 3.14.0-rc1)
They are unused, but if someone used them they would lead to
problems since they would copy the internal raw pointers
and the destructor would cause double delete
