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Copy files instead of hard-linking on Windows

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Fixes an issue on Windows where when source and build directory are on different drives hard-linking
to files or directory fails as it doesn't work across filesystem boundaries. Note that symlinking is also
not possible because it requires administrator privileges on Windows.

The solution copies the files using the built-in cmake `configure_file(src dest COPYONLY)` command.
As this command only operates on files, if a directory is specified the files will be globbed recursively
and through symlinks.

Signed-off-by: Dominik Gschwind <dominik.gschwind99@gmail.com>
This commit is contained in:
Dominik Gschwind
2022-08-10 16:27:14 +02:00
committed by Gilles Peskine
parent 3917028ab7
commit b0423a260c
2 changed files with 18 additions and 20 deletions
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29
CMakeLists.txt
View File

@@ -137,35 +137,30 @@ endif()
# Create a symbolic link from ${base_name} in the binary directory
# to the corresponding path in the source directory.
# Note: Copies the file(s) on Windows.
function(link_to_source base_name)
# Get OS dependent path to use in `execute_process`
if (CMAKE_HOST_WIN32)
#mklink is an internal command of cmd.exe it can only work with \
string(REPLACE "/" "\\" link "${CMAKE_CURRENT_BINARY_DIR}/${base_name}")
string(REPLACE "/" "\\" target "${CMAKE_CURRENT_SOURCE_DIR}/${base_name}")
else()
set(link "${CMAKE_CURRENT_BINARY_DIR}/${base_name}")
set(target "${CMAKE_CURRENT_SOURCE_DIR}/${base_name}")
endif()
if (NOT EXISTS ${link})
if (CMAKE_HOST_UNIX)
set(command ln -s ${target} ${link})
else()
if (IS_DIRECTORY ${target})
set(command cmd.exe /c mklink /j ${link} ${target})
else()
set(command cmd.exe /c mklink /h ${link} ${target})
endif()
endif()
execute_process(COMMAND ${command}
execute_process(COMMAND ln -s ${target} ${link}
RESULT_VARIABLE result
ERROR_VARIABLE output)
if (NOT ${result} EQUAL 0)
message(FATAL_ERROR "Could not create symbolic link for: ${target} --> ${output}")
endif()
else()
if (IS_DIRECTORY ${target})
file(GLOB_RECURSE files FOLLOW_SYMLINKS LIST_DIRECTORIES false RELATIVE ${target} "${target}/*")
foreach(file IN LISTS files)
configure_file("${target}/${file}" "${link}/${file}" COPYONLY)
endforeach(file)
else()
configure_file(${target} ${link} COPYONLY)
endif()
endif()
endif()
endfunction(link_to_source)

3
ChangeLog.d/fix_hard_link_across_drives Normal file
View File

@@ -0,0 +1,3 @@
Bugfix
* Fix a build issue on Windows where the source and build directory could not be on
different drives (#5751).