This fix was first made by commit 86e6349ef7 (find_program: Find
programs that are executable but not readable, 2020-04-04,
v3.18.0-rc1~372^2) but was reverted for compatibility. Re-introduce it
with a policy for compatibility.
Fixes: #10468
The fix in commit 86e6349ef7 (find_program: Find programs that are
executable but not readable, 2020-04-04, v3.18.0-rc1~372^2) can break
existing projects that were (likely accidentally) relying on the
old behavior to find files that are readable but not executable.
Revert the fix for now. We can re-introduce it with a policy later.
Instead of reverting the test case, update it to cover the old behavior.
That can serve as a reference for testing the policy when introduced.
Fixes: #20814
Issue: #10468
`find_program` internally uses `cmSystemTools::FileExists`
which calls `access(R_OK)` instead of `access(X_OK)`.
Use `cmSystemTools::IsFileExecutable` instead to fix this
issue. An example of such a program is `sudo`.
Fixes: #10468
In the same spirit as the REQUIRED keyword on find_package, this will
stop cmake execution with an error on a failed find_program, find_file,
find_path or find_library.
Teach the find_package, find_library, find_program, find_path, and
find_file commands to print debug log messages when enabled by the
`--debug-find` command-line option or `CMAKE_FIND_DEBUG_MODE` variable.
Since commit c76c1ea208 (find_program: Consider CWD only for paths with
separator, 2018-05-31, v3.13.0-rc1~413^2) this test has created a
directory in the source tree unnecessarily. Remove it.
find_program() incorrectly prepended search path components
to absolute file paths, and incorrectly searched the current
working directory for files that contained no directory
separators.
* Replace calls cmFindProgramHelper::CheckDirectory(std::string())
with call of new method cmFindProgramHelper::CheckCompoundNames()
that checks for the presence of a directory separator in the
file name.
* Use cmSystemTools::CollapseCombinedPath rather than string
concatenation to properly combine absolute file names with
search path components.
* Add unit tests to verify corrections.
Fixes: #18044
Changes in commit v3.4.0-rc1~124^2~1 (cmFindProgramCommand: Re-implement
search using more flexible approach, 2015-09-01) did not preserve the
behavior of looking for the given name with no search path at all.
Fix this and add a test case covering finding an absolute path with
no search directories.
When more than one value is given to the NAMES option this command by
default will consider one name at a time and search every directory for
it. Add a NAMES_PER_DIR option to tell this command to consider one
directory at a time and search for all names in it.
Previously this command was tested only implicitly as part of larger
tests. Add a RunCMake.find_program test to cover find_program cases
specifically and independently.
