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CMake: Add support for building and installing xz with translations.

If gettext tools are available, the .po files listed in po/LINGUAS
are converted using msgfmt. This allows building with translations
directly from xz.git without Autotools.

If gettext tools aren't available, the Autotools-created .gmo files
in the "po" directory will be used. This allows CMake-based build
to use translations from Autotools-generated tarball.

If translation support is found (Intl_FOUND) but both the
gettext tools and the pre-generated .gmo files are missing,
then "make" will fail.
This commit is contained in:
Lasse Collin 2024-02-17 15:35:35 +02:00
parent 746c471643
commit 50cc1d8a5a

View file

@ -10,8 +10,7 @@
# is somewhat experimental and not as portable as using ./configure.
#
# On some platforms this builds also xz and xzdec, but these are
# highly experimental and meant for testing only:
# - No translations
# highly experimental and meant for testing only.
#
# Other missing things:
# - No xzgrep or other scripts or their symlinks
@ -42,6 +41,7 @@
#
#############################################################################
# NOTE: Translation support is disabled with CMake older than 3.20.
cmake_minimum_required(VERSION 3.13...3.27 FATAL_ERROR)
include(CMakePushCheckState)
@ -189,6 +189,22 @@ if(HAVE_CLOCK_GETTIME OR HAVE_CLOCK_GETTIME_LIBRT)
tuklib_add_definition_if(ALL HAVE_CLOCK_MONOTONIC)
endif()
# Translation support requires CMake 3.20 because it added the Intl::Intl
# target so we don't need to play with the individual variables.
#
# The defintion ENABLE_NLS is added only to those targets that use it, thus
# it's not done here. (xz has translations, xzdec doesn't.)
if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.20")
find_package(Intl)
find_package(Gettext)
if(Intl_FOUND)
option(ENABLE_NLS "Native Language Support (translated messages)" ON)
# The *installed* name of the translation files is "xz.mo".
set(TRANSLATION_DOMAIN "xz")
endif()
endif()
# Options for new enough GCC or Clang on any arch or operating system:
if(CMAKE_C_COMPILER_ID MATCHES GNU|Clang)
# configure.ac has a long list but it won't be copied here:
@ -1489,6 +1505,54 @@ if(NOT MSVC OR MSVC_VERSION GREATER_EQUAL 1900)
endif()
endif()
if(ENABLE_NLS)
target_link_libraries(xz PRIVATE Intl::Intl)
target_compile_definitions(xz PRIVATE
ENABLE_NLS
PACKAGE="${TRANSLATION_DOMAIN}"
LOCALEDIR="${CMAKE_INSTALL_FULL_LOCALEDIR}"
)
file(STRINGS po/LINGUAS LINGUAS)
# Where to find .gmo files. If msgfmt is available, the .po files
# will be converted as part of the build. Otherwise we will use
# the pre-generated .gmo files which are included in XZ Utils
# tarballs by Autotools.
set(GMO_DIR "${CMAKE_CURRENT_SOURCE_DIR}/po")
if(GETTEXT_FOUND)
# NOTE: gettext_process_po_files' INSTALL_DESTINATION is
# incompatible with how Autotools requires the .po files to
# be named. CMake would require each .po file to be named with
# the translation domain and thus each .po file would need its
# own language-specific directory (like "po/fi/xz.po"). On top
# of this, INSTALL_DESTINATION doesn't allow specifying COMPONENT
# and thus the .mo files go into "Unspecified" component. So we
# can use gettext_process_po_files to convert the .po files but
# installation needs to be done with our own code.
#
# Also, the .gmo files will go to root of the build directory
# instead of neatly into a subdirectory. This is hardcoded in
# CMake's FindGettext.cmake.
foreach(LANG IN LISTS LINGUAS)
gettext_process_po_files("${LANG}" ALL
PO_FILES "${CMAKE_CURRENT_SOURCE_DIR}/po/${LANG}.po")
endforeach()
set(GMO_DIR "${CMAKE_CURRENT_BINARY_DIR}")
endif()
foreach(LANG IN LISTS LINGUAS)
install(
FILES "${GMO_DIR}/${LANG}.gmo"
DESTINATION "${CMAKE_INSTALL_LOCALEDIR}/${LANG}/LC_MESSAGES"
RENAME "${TRANSLATION_DOMAIN}.mo"
COMPONENT xz)
endforeach()
endif()
install(TARGETS xz
RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
COMPONENT xz)