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CMake: Make XZ_NLS handling more robust

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If a user set XZ_NLS=ON but find_package(Intl) failed or CMake version
wasn't at least 3.20, the configuration would fail in a cryptic way.

If XZ_NLS is enabled, require that CMake is new enough and that either
gettext tools or pre-generated .gmo files are available. Otherwise fail
the configuration. Previously missing gettext tools and .gmo files would
only result in a warning.

Missing man page translations are still only a warning.

Thanks to Peter Seiderer for the bug report.

Fixes: https://github.com/tukaani-project/xz/issues/129
Closes: https://github.com/tukaani-project/xz/pull/130
This commit is contained in:
Lasse Collin 2024-07-02 19:14:50 +03:00
parent ec6157570e
commit fb99f8e8c5
1 changed files with 49 additions and 39 deletions
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88
CMakeLists.txt
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@ -310,58 +310,68 @@ 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 definition ENABLE_NLS is added only to those targets that use it, thus
# it's not done here. (xz has translations, xzdec doesn't.)
set(XZ_NLS_DEFAULT OFF)
if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.20")
find_package(Intl)
find_package(Gettext)
if(Intl_FOUND)
option(XZ_NLS
"Native Language Support (translated messages and man pages)"
ON)
# If translation support is enabled but neither gettext tools or
# pre-generated .gmo files exist, translation support cannot be
# enabled.
#
# The detection of pre-generated .gmo files is done by only
# checking for the existence of a single .gmo file; Ukrainian
# is one of many translations that gets regular updates.
if(XZ_NLS AND NOT GETTEXT_FOUND AND
NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/po/uk.gmo")
# This only sets the variable, not the cache variable!
set(XZ_NLS OFF)
# This message is shown only when new enough CMake is used and
# library support for translations was found. The assumptions is
# that in this situation the user might have interest in the
# translations. This also keeps this code simpler.
message(WARNING "Native language support (NLS) has been disabled. "
"NLS support requires either gettext tools or "
"pre-generated .gmo files. The latter are only "
"available in distribution tarballs. "
"To avoid this warning, NLS can be explicitly "
"disabled by passing -DXZ_NLS=OFF to cmake.")
endif()
# Warn if NLS is enabled but translated man pages are missing.
if(UNIX AND XZ_NLS AND
NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/po4a/man")
message(WARNING "Native language support (NLS) has been enabled "
"but pre-generated translated man pages "
"were not found and thus they won't be installed. "
"Run 'po4a/update-po' to generate them.")
endif()
# The *installed* name of the translation files is "xz.mo".
set(TRANSLATION_DOMAIN "xz")
set(XZ_NLS_DEFAULT ON)
endif()
endif()
option(XZ_NLS "Native Language Support (translated messages and man pages)"
"${XZ_NLS_DEFAULT}")
if(XZ_NLS)
if(CMAKE_VERSION VERSION_LESS "3.20")
message(FATAL_ERROR "XZ_NLS=ON requires CMake >= 3.20. "
"Upgrade to a newer CMake or set XZ_NLS=OFF.")
endif()
if(NOT Intl_FOUND)
message(FATAL_ERROR "XZ_NLS=ON but find_package(Intl) failed. "
"Install libintl or set XZ_NLS=OFF.")
endif()
# If translation support is enabled but neither gettext tools or
# pre-generated .gmo files exist, translation support cannot be enabled.
#
# The detection of pre-generated .gmo files is done by only
# checking for the existence of a single .gmo file; Ukrainian
# is one of many translations that gets regular updates.
if(NOT GETTEXT_FOUND AND
NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/po/uk.gmo")
# By default this message is shown only when new enough CMake is used
# and library support for translations was found. The assumptions is
# that in this situation the user might have interest in the
# translations. This also keeps this code simpler.
message(FATAL_ERROR "Native language support (NLS) requires either "
"gettext tools or pre-generated .gmo files. "
"The latter are only available in distribution "
"tarballs. "
"Install gettext tools or set XZ_NLS=OFF.")
endif()
# Warn if translated man pages are missing.
if(UNIX AND NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/po4a/man")
message(WARNING "Native language support (NLS) has been enabled "
"but pre-generated translated man pages "
"were not found and thus they won't be installed. "
"Run 'po4a/update-po' to generate them.")
endif()
# The *installed* name of the translation files is "xz.mo".
set(TRANSLATION_DOMAIN "xz")
endif()
# Add warning options for GCC or Clang. Keep this in sync with configure.ac.
#
# NOTE: add_compile_options() doesn't affect the feature checks;