NLS: Put list of available languages into LINGUAS files

This moves the list of available languages from nls.mk into a separate
file called po/LINGUAS.  Advantages:

- It keeps the parts notionally managed by programmers (nls.mk)
  separate from the parts notionally managed by translators (LINGUAS).

- It's the standard practice recommended by the Gettext manual
  nowadays.

- The Meson build system also supports this layout (and of course
  doesn't know anything about our custom nls.mk), so this would enable
  sharing the list of languages between the two build systems.

(The MSVC build system currently finds all po files by globbing, so it
is not affected by this change.)

Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/557a9f5c-e871-edc7-2f58-a4140fb65b7b@enterprisedb.com

54 files changed, 41 insertions, 40 deletions

diff --git a/doc/src/sgml/nls.sgml b/doc/src/sgml/nls.sgml
index d49f44f3f23..4b683458f9c 100644
--- a/doc/src/sgml/nls.sgml
+++ b/doc/src/sgml/nls.sgml
@@ -175,10 +175,11 @@ make init-po
     Copy this file to
     <filename><replaceable>language</replaceable>.po</filename> and
     edit it.  To make it known that the new language is available,
-    also edit the file <filename>nls.mk</filename> and add the
-    language (or language and country) code to the line that looks like:
+    also edit the file <filename>po/LINGUAS</filename> and add the
+    language (or language and country) code next to languages already listed,
+    like:
 <programlisting>
-AVAIL_LANGUAGES := de fr
+de fr
 </programlisting>
     (Other languages can appear, of course.)
    </para>
@@ -376,16 +377,6 @@ fprintf(stderr, gettext("panic level %d\n"), lvl);
       </varlistentry>
 
       <varlistentry>
-       <term><varname>AVAIL_LANGUAGES</varname></term>
-
-       <listitem>
-        <para>
-         List of provided translations &mdash; initially empty.
-        </para>
-       </listitem>
-      </varlistentry>
-
-      <varlistentry>
        <term><varname>GETTEXT_FILES</varname></term>
 
        <listitem>
@@ -424,6 +415,12 @@ fprintf(stderr, gettext("panic level %d\n"), lvl);
     </para>
    </step>
 
+   <step>
+    <para>
+     Add a file <filename>po/LINGUAS</filename>, which will contain the list
+     of provided translations &mdash; initially empty.
+    </para>
+   </step>
   </procedure>
 
   <para>
diff --git a/src/backend/nls.mk b/src/backend/nls.mk
index 355299804f3..c31339be317 100644
--- a/src/backend/nls.mk
+++ b/src/backend/nls.mk
@@ -1,6 +1,5 @@
 # src/backend/nls.mk
 CATALOG_NAME     = postgres
-AVAIL_LANGUAGES  = de es fr id it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = + gettext-files
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS) \
     GUC_check_errmsg \
diff --git a/src/backend/po/LINGUAS b/src/backend/po/LINGUAS
new file mode 100644
index 00000000000..a27ddd5ceaf
--- /dev/null
+++ b/src/backend/po/LINGUAS
@@ -0,0 +1 @@
+de es fr id it ja ko pl pt_BR ru sv tr uk zh_CN
diff --git a/src/bin/initdb/nls.mk b/src/bin/initdb/nls.mk
index fe7bdfc04a5..19c91368493 100644
--- a/src/bin/initdb/nls.mk
+++ b/src/bin/initdb/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/initdb/nls.mk
 CATALOG_NAME     = initdb
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) findtimezone.c initdb.c ../../common/exec.c ../../common/fe_memutils.c ../../common/file_utils.c ../../common/pgfnames.c ../../common/restricted_token.c ../../common/rmtree.c ../../common/username.c ../../common/wait_error.c ../../port/dirmod.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS) simple_prompt
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/bin/initdb/po/LINGUAS b/src/bin/initdb/po/LINGUAS
new file mode 100644
index 00000000000..3a24184a0e4
--- /dev/null
+++ b/src/bin/initdb/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk vi zh_CN
diff --git a/src/bin/pg_amcheck/nls.mk b/src/bin/pg_amcheck/nls.mk
index 0813fe1cec0..5e6171952c0 100644
--- a/src/bin/pg_amcheck/nls.mk
+++ b/src/bin/pg_amcheck/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_amcheck/nls.mk
 CATALOG_NAME     = pg_amcheck
-AVAIL_LANGUAGES  = de el es fr ja ru sv uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    pg_amcheck.c \
                    ../../fe_utils/cancel.c \
diff --git a/src/bin/pg_amcheck/po/LINGUAS b/src/bin/pg_amcheck/po/LINGUAS
new file mode 100644
index 00000000000..7595b76a609
--- /dev/null
+++ b/src/bin/pg_amcheck/po/LINGUAS
@@ -0,0 +1 @@
+de el es fr ja ru sv uk zh_CN
diff --git a/src/bin/pg_archivecleanup/nls.mk b/src/bin/pg_archivecleanup/nls.mk
index 51a6767d8d9..801cf1c51e8 100644
--- a/src/bin/pg_archivecleanup/nls.mk
+++ b/src/bin/pg_archivecleanup/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_archivecleanup/nls.mk
 CATALOG_NAME     = pg_archivecleanup
-AVAIL_LANGUAGES  = cs de el es fr ja ko pl ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) pg_archivecleanup.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/bin/pg_archivecleanup/po/LINGUAS b/src/bin/pg_archivecleanup/po/LINGUAS
new file mode 100644
index 00000000000..f0979eabeee
--- /dev/null
+++ b/src/bin/pg_archivecleanup/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr ja ko pl ru sv tr uk vi zh_CN
diff --git a/src/bin/pg_basebackup/nls.mk b/src/bin/pg_basebackup/nls.mk
index ec7393d3211..8d28e249ded 100644
--- a/src/bin/pg_basebackup/nls.mk
+++ b/src/bin/pg_basebackup/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_basebackup/nls.mk
 CATALOG_NAME     = pg_basebackup
-AVAIL_LANGUAGES  = cs de es fr he it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    bbstreamer_file.c \
                    bbstreamer_gzip.c \
diff --git a/src/bin/pg_basebackup/po/LINGUAS b/src/bin/pg_basebackup/po/LINGUAS
new file mode 100644
index 00000000000..9852f707fcc
--- /dev/null
+++ b/src/bin/pg_basebackup/po/LINGUAS
@@ -0,0 +1 @@
+cs de es fr he it ja ko pl pt_BR ru sv tr uk vi zh_CN
diff --git a/src/bin/pg_checksums/nls.mk b/src/bin/pg_checksums/nls.mk
index 5d8fd7e7cc3..f7cd2a5ee93 100644
--- a/src/bin/pg_checksums/nls.mk
+++ b/src/bin/pg_checksums/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_checksums/nls.mk
 CATALOG_NAME     = pg_checksums
-AVAIL_LANGUAGES  = cs de el es fr ja ko ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    pg_checksums.c \
                    ../../fe_utils/option_utils.c
diff --git a/src/bin/pg_checksums/po/LINGUAS b/src/bin/pg_checksums/po/LINGUAS
new file mode 100644
index 00000000000..78db9aeb22f
--- /dev/null
+++ b/src/bin/pg_checksums/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr ja ko ru sv tr uk zh_CN
diff --git a/src/bin/pg_config/nls.mk b/src/bin/pg_config/nls.mk
index 77680fa23c0..d86c28c404d 100644
--- a/src/bin/pg_config/nls.mk
+++ b/src/bin/pg_config/nls.mk
@@ -1,4 +1,3 @@
 # src/bin/pg_config/nls.mk
 CATALOG_NAME     = pg_config
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko nb pl pt_BR ro ru sv ta tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = pg_config.c ../../common/config_info.c ../../common/exec.c
diff --git a/src/bin/pg_config/po/LINGUAS b/src/bin/pg_config/po/LINGUAS
new file mode 100644
index 00000000000..8736ee6d493
--- /dev/null
+++ b/src/bin/pg_config/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr he it ja ko nb pl pt_BR ro ru sv ta tr uk vi zh_CN zh_TW
diff --git a/src/bin/pg_controldata/nls.mk b/src/bin/pg_controldata/nls.mk
index 5c0e33e91a1..ab34205b960 100644
--- a/src/bin/pg_controldata/nls.mk
+++ b/src/bin/pg_controldata/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_controldata/nls.mk
 CATALOG_NAME     = pg_controldata
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = pg_controldata.c ../../common/controldata_utils.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/bin/pg_controldata/po/LINGUAS b/src/bin/pg_controldata/po/LINGUAS
new file mode 100644
index 00000000000..a13bb1a2ca9
--- /dev/null
+++ b/src/bin/pg_controldata/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
diff --git a/src/bin/pg_ctl/nls.mk b/src/bin/pg_ctl/nls.mk
index 15b5b4851a2..84e7fb4e560 100644
--- a/src/bin/pg_ctl/nls.mk
+++ b/src/bin/pg_ctl/nls.mk
@@ -1,4 +1,3 @@
 # src/bin/pg_ctl/nls.mk
 CATALOG_NAME     = pg_ctl
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = pg_ctl.c ../../common/exec.c ../../common/fe_memutils.c ../../common/wait_error.c ../../port/path.c
diff --git a/src/bin/pg_ctl/po/LINGUAS b/src/bin/pg_ctl/po/LINGUAS
new file mode 100644
index 00000000000..508771c97c1
--- /dev/null
+++ b/src/bin/pg_ctl/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
diff --git a/src/bin/pg_dump/nls.mk b/src/bin/pg_dump/nls.mk
index dc7360db487..3054f93fadf 100644
--- a/src/bin/pg_dump/nls.mk
+++ b/src/bin/pg_dump/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_dump/nls.mk
 CATALOG_NAME     = pg_dump
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    pg_backup_archiver.c pg_backup_db.c pg_backup_custom.c \
                    pg_backup_null.c pg_backup_tar.c \
diff --git a/src/bin/pg_dump/po/LINGUAS b/src/bin/pg_dump/po/LINGUAS
new file mode 100644
index 00000000000..508771c97c1
--- /dev/null
+++ b/src/bin/pg_dump/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
diff --git a/src/bin/pg_resetwal/nls.mk b/src/bin/pg_resetwal/nls.mk
index 6b85a78828c..bc25482f2ca 100644
--- a/src/bin/pg_resetwal/nls.mk
+++ b/src/bin/pg_resetwal/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_resetwal/nls.mk
 CATALOG_NAME     = pg_resetwal
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) pg_resetwal.c ../../common/restricted_token.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/bin/pg_resetwal/po/LINGUAS b/src/bin/pg_resetwal/po/LINGUAS
new file mode 100644
index 00000000000..7a718f6be50
--- /dev/null
+++ b/src/bin/pg_resetwal/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk zh_CN
diff --git a/src/bin/pg_rewind/nls.mk b/src/bin/pg_rewind/nls.mk
index e9d91a39cb8..0618cb8c2cf 100644
--- a/src/bin/pg_rewind/nls.mk
+++ b/src/bin/pg_rewind/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_rewind/nls.mk
 CATALOG_NAME     = pg_rewind
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) datapagemap.c file_ops.c filemap.c libpq_source.c local_source.c parsexlog.c pg_rewind.c timeline.c xlogreader.c ../../common/fe_memutils.c ../../common/restricted_token.c ../../fe_utils/archive.c ../../fe_utils/recovery_gen.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS) report_invalid_record:2
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS) \
diff --git a/src/bin/pg_rewind/po/LINGUAS b/src/bin/pg_rewind/po/LINGUAS
new file mode 100644
index 00000000000..7a718f6be50
--- /dev/null
+++ b/src/bin/pg_rewind/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk zh_CN
diff --git a/src/bin/pg_test_fsync/nls.mk b/src/bin/pg_test_fsync/nls.mk
index 4b4d33b95a1..a50782036ca 100644
--- a/src/bin/pg_test_fsync/nls.mk
+++ b/src/bin/pg_test_fsync/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_test_fsync/nls.mk
 CATALOG_NAME     = pg_test_fsync
-AVAIL_LANGUAGES  = cs de el es fr ja ko pl ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) pg_test_fsync.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS) die
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/bin/pg_test_fsync/po/LINGUAS b/src/bin/pg_test_fsync/po/LINGUAS
new file mode 100644
index 00000000000..f0979eabeee
--- /dev/null
+++ b/src/bin/pg_test_fsync/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr ja ko pl ru sv tr uk vi zh_CN
diff --git a/src/bin/pg_test_timing/nls.mk b/src/bin/pg_test_timing/nls.mk
index 126f45e2cb4..331931c591f 100644
--- a/src/bin/pg_test_timing/nls.mk
+++ b/src/bin/pg_test_timing/nls.mk
@@ -1,4 +1,3 @@
 # src/bin/pg_test_timing/nls.mk
 CATALOG_NAME     = pg_test_timing
-AVAIL_LANGUAGES  = cs de el es fr ja ko pl ru sv tr uk vi zh_CN
 GETTEXT_FILES    = pg_test_timing.c
diff --git a/src/bin/pg_test_timing/po/LINGUAS b/src/bin/pg_test_timing/po/LINGUAS
new file mode 100644
index 00000000000..f0979eabeee
--- /dev/null
+++ b/src/bin/pg_test_timing/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr ja ko pl ru sv tr uk vi zh_CN
diff --git a/src/bin/pg_upgrade/nls.mk b/src/bin/pg_upgrade/nls.mk
index bfaacfbb7c6..8a4ebbcbe93 100644
--- a/src/bin/pg_upgrade/nls.mk
+++ b/src/bin/pg_upgrade/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_upgrade/nls.mk
 CATALOG_NAME     = pg_upgrade
-AVAIL_LANGUAGES  = cs de es fr ja ko ru sv tr uk zh_CN
 GETTEXT_FILES    = check.c controldata.c dump.c exec.c file.c function.c \
                    info.c option.c parallel.c pg_upgrade.c relfilenode.c \
                    server.c tablespace.c util.c version.c
diff --git a/src/bin/pg_upgrade/po/LINGUAS b/src/bin/pg_upgrade/po/LINGUAS
new file mode 100644
index 00000000000..ac603aedb25
--- /dev/null
+++ b/src/bin/pg_upgrade/po/LINGUAS
@@ -0,0 +1 @@
+cs de es fr ja ko ru sv tr uk zh_CN
diff --git a/src/bin/pg_verifybackup/nls.mk b/src/bin/pg_verifybackup/nls.mk
index 81b96356da6..eba73a2c058 100644
--- a/src/bin/pg_verifybackup/nls.mk
+++ b/src/bin/pg_verifybackup/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_verifybackup/nls.mk
 CATALOG_NAME     = pg_verifybackup
-AVAIL_LANGUAGES  = de el es fr ja ko ru sv uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    parse_manifest.c \
                    pg_verifybackup.c \
diff --git a/src/bin/pg_verifybackup/po/LINGUAS b/src/bin/pg_verifybackup/po/LINGUAS
new file mode 100644
index 00000000000..6db2f243561
--- /dev/null
+++ b/src/bin/pg_verifybackup/po/LINGUAS
@@ -0,0 +1 @@
+de el es fr ja ko ru sv uk zh_CN
diff --git a/src/bin/pg_waldump/nls.mk b/src/bin/pg_waldump/nls.mk
index 159638fc00d..a9eeb6712bc 100644
--- a/src/bin/pg_waldump/nls.mk
+++ b/src/bin/pg_waldump/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/pg_waldump/nls.mk
 CATALOG_NAME     = pg_waldump
-AVAIL_LANGUAGES  = cs de el es fr ja ko ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) pg_waldump.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/bin/pg_waldump/po/LINGUAS b/src/bin/pg_waldump/po/LINGUAS
new file mode 100644
index 00000000000..3a64d2e74c6
--- /dev/null
+++ b/src/bin/pg_waldump/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr ja ko ru sv tr uk vi zh_CN
diff --git a/src/bin/psql/nls.mk b/src/bin/psql/nls.mk
index 52c96e3677c..dad5816b9c7 100644
--- a/src/bin/psql/nls.mk
+++ b/src/bin/psql/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/psql/nls.mk
 CATALOG_NAME     = psql
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN zh_TW
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    command.c common.c copy.c crosstabview.c help.c input.c large_obj.c \
                    mainloop.c psqlscanslash.c startup.c \
diff --git a/src/bin/psql/po/LINGUAS b/src/bin/psql/po/LINGUAS
new file mode 100644
index 00000000000..6704d6f4b38
--- /dev/null
+++ b/src/bin/psql/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN zh_TW
diff --git a/src/bin/scripts/nls.mk b/src/bin/scripts/nls.mk
index f61ff79396e..f4638a06f0d 100644
--- a/src/bin/scripts/nls.mk
+++ b/src/bin/scripts/nls.mk
@@ -1,6 +1,5 @@
 # src/bin/scripts/nls.mk
 CATALOG_NAME     = pgscripts
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    createdb.c createuser.c \
                    dropdb.c dropuser.c \
diff --git a/src/bin/scripts/po/LINGUAS b/src/bin/scripts/po/LINGUAS
new file mode 100644
index 00000000000..508771c97c1
--- /dev/null
+++ b/src/bin/scripts/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
diff --git a/src/interfaces/ecpg/ecpglib/nls.mk b/src/interfaces/ecpg/ecpglib/nls.mk
index 2f6b0895f57..77eecc98f38 100644
--- a/src/interfaces/ecpg/ecpglib/nls.mk
+++ b/src/interfaces/ecpg/ecpglib/nls.mk
@@ -1,6 +1,5 @@
 # src/interfaces/ecpg/ecpglib/nls.mk
 CATALOG_NAME     = ecpglib
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = connect.c descriptor.c error.c execute.c misc.c
 GETTEXT_TRIGGERS = ecpg_gettext
 GETTEXT_FLAGS    = ecpg_gettext:1:pass-c-format
diff --git a/src/interfaces/ecpg/ecpglib/po/LINGUAS b/src/interfaces/ecpg/ecpglib/po/LINGUAS
new file mode 100644
index 00000000000..a13bb1a2ca9
--- /dev/null
+++ b/src/interfaces/ecpg/ecpglib/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
diff --git a/src/interfaces/ecpg/preproc/nls.mk b/src/interfaces/ecpg/preproc/nls.mk
index fed0f7c9e53..55ea19a44ed 100644
--- a/src/interfaces/ecpg/preproc/nls.mk
+++ b/src/interfaces/ecpg/preproc/nls.mk
@@ -1,6 +1,5 @@
 # src/interfaces/ecpg/preproc/nls.mk
 CATALOG_NAME     = ecpg
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = descriptor.c ecpg.c pgc.c preproc.c type.c variable.c
 GETTEXT_TRIGGERS = mmerror:3 mmfatal:2
 GETTEXT_FLAGS    = mmerror:3:c-format mmfatal:2:c-format
diff --git a/src/interfaces/ecpg/preproc/po/LINGUAS b/src/interfaces/ecpg/preproc/po/LINGUAS
new file mode 100644
index 00000000000..991612cffee
--- /dev/null
+++ b/src/interfaces/ecpg/preproc/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN zh_TW
diff --git a/src/interfaces/libpq/nls.mk b/src/interfaces/libpq/nls.mk
index 1f62ba1b57d..9256b426c1d 100644
--- a/src/interfaces/libpq/nls.mk
+++ b/src/interfaces/libpq/nls.mk
@@ -1,6 +1,5 @@
 # src/interfaces/libpq/nls.mk
 CATALOG_NAME     = libpq
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN zh_TW
 GETTEXT_FILES    = fe-auth.c fe-auth-scram.c fe-connect.c fe-exec.c fe-gssapi-common.c fe-lobj.c fe-misc.c fe-protocol3.c fe-secure.c fe-secure-common.c fe-secure-gssapi.c fe-secure-openssl.c win32.c ../../port/thread.c
 GETTEXT_TRIGGERS = libpq_gettext pqInternalNotice:2
 GETTEXT_FLAGS    = libpq_gettext:1:pass-c-format pqInternalNotice:2:c-format
diff --git a/src/interfaces/libpq/po/LINGUAS b/src/interfaces/libpq/po/LINGUAS
new file mode 100644
index 00000000000..6704d6f4b38
--- /dev/null
+++ b/src/interfaces/libpq/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN zh_TW
diff --git a/src/nls-global.mk b/src/nls-global.mk
index c1f7982300e..ba4f5698038 100644
--- a/src/nls-global.mk
+++ b/src/nls-global.mk
@@ -8,7 +8,6 @@
 #
 # CATALOG_NAME          -- name of the message catalog (xxx.po); probably
 #                          name of the program
-# AVAIL_LANGUAGES       -- list of languages that are provided/supported
 # GETTEXT_FILES         -- list of source files that contain message strings
 # GETTEXT_TRIGGERS      -- (optional) list of functions that contain
 #                          translatable strings
@@ -16,6 +15,9 @@
 #                          function arguments that contain C format strings
 #                          (functions must be listed in TRIGGERS and FLAGS)
 #
+# Also, provide a text file 'po/LINGUAS' with a space-separated list
+# of languages that are provided/supported.
+#
 # That's all, the rest is done here, if --enable-nls was specified.
 #
 # The only user-visible targets here are 'init-po', to make an initial
@@ -27,6 +29,8 @@
 # existence checked by Makefile.global; otherwise we won't get here
 include $(srcdir)/nls.mk
 
+AVAIL_LANGUAGES := $(shell sed -e "/^#/d" -e "s/#.*//" po/LINGUAS)
+
 # If user specified the languages he wants in --enable-nls=LANGUAGES,
 # filter out the rest.  Else use all available ones.
 ifdef WANTED_LANGUAGES
diff --git a/src/pl/plperl/nls.mk b/src/pl/plperl/nls.mk
index ccdf1c3316b..8c41bfac7a9 100644
--- a/src/pl/plperl/nls.mk
+++ b/src/pl/plperl/nls.mk
@@ -1,6 +1,5 @@
 # src/pl/plperl/nls.mk
 CATALOG_NAME     = plperl
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = plperl.c SPI.c
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(BACKEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/pl/plperl/po/LINGUAS b/src/pl/plperl/po/LINGUAS
new file mode 100644
index 00000000000..37bf941be3e
--- /dev/null
+++ b/src/pl/plperl/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW
diff --git a/src/pl/plpgsql/src/nls.mk b/src/pl/plpgsql/src/nls.mk
index 11878d2d5b2..2bd620a8ddd 100644
--- a/src/pl/plpgsql/src/nls.mk
+++ b/src/pl/plpgsql/src/nls.mk
@@ -1,6 +1,5 @@
 # src/pl/plpgsql/src/nls.mk
 CATALOG_NAME     = plpgsql
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = pl_comp.c pl_exec.c pl_gram.c pl_funcs.c pl_handler.c pl_scanner.c
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS) yyerror plpgsql_yyerror
 GETTEXT_FLAGS    = $(BACKEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/pl/plpgsql/src/po/LINGUAS b/src/pl/plpgsql/src/po/LINGUAS
new file mode 100644
index 00000000000..37bf941be3e
--- /dev/null
+++ b/src/pl/plpgsql/src/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW
diff --git a/src/pl/plpython/nls.mk b/src/pl/plpython/nls.mk
index c46e26200b7..4c68a0e571d 100644
--- a/src/pl/plpython/nls.mk
+++ b/src/pl/plpython/nls.mk
@@ -1,6 +1,5 @@
 # src/pl/plpython/nls.mk
 CATALOG_NAME     = plpython
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = plpy_cursorobject.c plpy_elog.c plpy_exec.c plpy_main.c plpy_planobject.c plpy_plpymodule.c \
                    plpy_procedure.c plpy_resultobject.c plpy_spi.c plpy_subxactobject.c plpy_typeio.c plpy_util.c
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS) PLy_elog:2 PLy_exception_set:2 PLy_exception_set_plural:2,3
diff --git a/src/pl/plpython/po/LINGUAS b/src/pl/plpython/po/LINGUAS
new file mode 100644
index 00000000000..a13bb1a2ca9
--- /dev/null
+++ b/src/pl/plpython/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
diff --git a/src/pl/tcl/nls.mk b/src/pl/tcl/nls.mk
index fe6e84a3a42..8366998df15 100644
--- a/src/pl/tcl/nls.mk
+++ b/src/pl/tcl/nls.mk
@@ -1,6 +1,5 @@
 # src/pl/tcl/nls.mk
 CATALOG_NAME     = pltcl
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = pltcl.c
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(BACKEND_COMMON_GETTEXT_FLAGS)
diff --git a/src/pl/tcl/po/LINGUAS b/src/pl/tcl/po/LINGUAS
new file mode 100644
index 00000000000..37bf941be3e
--- /dev/null
+++ b/src/pl/tcl/po/LINGUAS
@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW