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authorJulian Andres Klode <jak@debian.org>2016-08-09 13:10:28 +0200
committerJulian Andres Klode <jak@debian.org>2016-08-10 16:11:16 +0200
commite164341c20625f62a44be16e6f3fbab66334f130 (patch)
treecaf82754b6dc3c55d94aca79a01b83fd855710aa /CMake
parentddf40a42f5a699086466990f85d86e6c4977524a (diff)
CMake: Translations: Avoid rebuilding .mo if .pot did not change
Use the witness/byproducts approach to build the translations. A byproduct of a command is like an output, but may be older than the input. Here, we generate a normal template with headers in the normal way as a witness (and for Launchpad translations), but we also generate a .pot-tmp0 template file without a header that gets copied to a .pot-tmp byproduct only if it changed. This way, the .pot-tmp is only updated if an actual string translation changed. We also create a custom target for the .pot file that we'll depend on later in the overall target creating the mo files to ensure that the template is build before we try to build mo files. Then we make the msgmerge depend on the .pot-tmp instead of the .pot file, which means that msgmerge and msgfmt only get re-run if a string change occured. Gbp-Dch: ignore
Diffstat (limited to 'CMake')
-rw-r--r--CMake/Translations.cmake25
1 files changed, 21 insertions, 4 deletions
diff --git a/CMake/Translations.cmake b/CMake/Translations.cmake
index 8b657c20f..584c5c5af 100644
--- a/CMake/Translations.cmake
+++ b/CMake/Translations.cmake
@@ -75,16 +75,32 @@ function(apt_add_translation_domain)
WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
)
+ # We are building a ${domain}.pot with a header for launchpad, but we also
+ # build a ${domain.pot}-tmp as a byproduct. The msgfmt command than depend
+ # on the byproduct while their target depends on the output, so that msgfmt
+ # does not have to be rerun if nothing in the template changed.
add_custom_command (OUTPUT ${PROJECT_BINARY_DIR}/${domain}.pot
+ BYPRODUCTS ${PROJECT_BINARY_DIR}/${domain}.pot-tmp
COMMAND msgcomm --more-than=0 --sort-by-file
${sh_pot}
${PROJECT_BINARY_DIR}/${domain}.c.pot
--output=${PROJECT_BINARY_DIR}/${domain}.pot
+ COMMAND msgcomm --more-than=0 --omit-header --sort-by-file
+ ${sh_pot}
+ ${PROJECT_BINARY_DIR}/${domain}.c.pot
+ --output=${PROJECT_BINARY_DIR}/${domain}.pot-tmp0
+ COMMAND cmake -E copy_if_different
+ ${PROJECT_BINARY_DIR}/${domain}.pot-tmp0
+ ${PROJECT_BINARY_DIR}/${domain}.pot-tmp
DEPENDS ${sh_pot}
${PROJECT_BINARY_DIR}/${domain}.c.pot
WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
)
+ # We need a target to depend on otherwise, the msgmerge might not get called
+ # with the make generator
+ add_custom_target(nls-${domain}-template DEPENDS ${PROJECT_BINARY_DIR}/${domain}.pot)
+
# Build .mo files
file(GLOB translations "${PROJECT_SOURCE_DIR}/po/*.po")
list(SORT translations)
@@ -92,10 +108,11 @@ function(apt_add_translation_domain)
get_filename_component(langcode ${file} NAME_WE)
set(outdir ${PROJECT_BINARY_DIR}/locale/${langcode}/LC_MESSAGES)
file(MAKE_DIRECTORY ${outdir})
- # Command to merge and compile the messages
+ # Command to merge and compile the messages. As explained in the custom
+ # command for msgcomm, this depends on byproduct to avoid reruns
add_custom_command(OUTPUT ${outdir}/${domain}.po
- COMMAND msgmerge -qo ${outdir}/${domain}.po ${file} ${PROJECT_BINARY_DIR}/${domain}.pot
- DEPENDS ${file} ${PROJECT_BINARY_DIR}/${domain}.pot
+ COMMAND msgmerge -qo ${outdir}/${domain}.po ${file} ${PROJECT_BINARY_DIR}/${domain}.pot-tmp
+ DEPENDS ${file} ${PROJECT_BINARY_DIR}/${domain}.pot-tmp
)
add_custom_command(OUTPUT ${outdir}/${domain}.mo
COMMAND msgfmt --statistics -o ${outdir}/${domain}.mo ${outdir}/${domain}.po
@@ -107,7 +124,7 @@ function(apt_add_translation_domain)
DESTINATION "${CMAKE_INSTALL_LOCALEDIR}/${langcode}/LC_MESSAGES")
endforeach(file ${translations})
- add_custom_target(nls-${domain} ALL DEPENDS ${mofiles})
+ add_custom_target(nls-${domain} ALL DEPENDS ${mofiles} nls-${domain}-template)
endfunction()
# Usage: apt_add_update_po(output domain [domain ...])