Introduce CMAKE_STAGING_PREFIX variable.

This variable can be useful in cross-compiling contexts where the
sysroot is read-only or where the sysroot should otherwise remain
pristine.

If the new CMAKE_STAGING_PREFIX variable is set, it is used instead
of CMAKE_INSTALL_PREFIX when generating the installation rules in
cmake_install.cmake.

This way, the CMAKE_INSTALL_PREFIX variable
always refers to the installation prefix on the target device, regardless
of whether host==target.

If any -rpath paths passed to the linker contain the CMAKE_STAGING_PREFIX,
the matching path fragments are replaced with the CMAKE_INSTALL_PREFIX.
Matching paths in the -rpath-link are not transformed.

The cross-prefix usr-move workaround is assumed not to require extension
regarding CMAKE_STAGING_PREFIX. The staging area is a single prefix, so
there is no scope for cross-prefix symlinks. The CMAKE_INSTALL_PREFIX
is still used to determine the workaround path, and that variable
remains the relevant one even if CMAKE_STAGING_PREFIX is used. If the
generated export files are deployed to the target, the workaround
will still be in place, and still be employed if required.
This commit is contained in:
Stephen Kelly
2013-11-14 12:04:40 +01:00
parent e776a2dae4
commit 7521da2852
21 changed files with 267 additions and 9 deletions

View File

@@ -1,7 +1,9 @@
The CMake variable CMAKE_FIND_ROOT_PATH specifies one or more
directories to be prepended to all other search directories. This
effectively "re-roots" the entire search under given locations. By
default it is empty.
effectively "re-roots" the entire search under given locations.
Paths which are descendants of the :variable:`CMAKE_STAGING_PREFIX` are excluded
from this re-rooting, because that variable is always a path on the host system.
By default the CMAKE_FIND_ROOT_PATH is empty.
The :variable:`CMAKE_SYSROOT` variable can also be used to specify exactly one
directory to use as a prefix. Setting :variable:`CMAKE_SYSROOT` also has other
@@ -18,4 +20,4 @@ overridden on a per-call basis. By using CMAKE_FIND_ROOT_PATH_BOTH
the search order will be as described above. If
NO_CMAKE_FIND_ROOT_PATH is used then CMAKE_FIND_ROOT_PATH will not be
used. If ONLY_CMAKE_FIND_ROOT_PATH is used then only the re-rooted
directories will be searched.
directories and directories below :variable:`CMAKE_STAGING_PREFIX` will be searched.