Re: Debian PostgreSQL 15 pg_createcluster - could not open collator for locale

> On 26/03/2023 00:06 CET Matt Gibbins <matt_gibbins@fastmail.com.au> wrote:
>
> The version currently installed as identified from dpkg -l is.
>
> Desired=Unknown/Install/Remove/Purge/Hold
> |
> Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
> |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
> ||/ Name           Version      Architecture Description
>
> +++-==============-============-============-====================================
> ii  libicu67:amd64 67.1-7       amd64        International Components
> for Unicode
>
> The ls command returns.
>
> lrwxrwxrwx 1 root root       18 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicudata.so.67 -> libicudata.so.67.1
> -rw-r--r-- 1 root root 28407344 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicudata.so.67.1
> lrwxrwxrwx 1 root root       18 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicui18n.so.67 -> libicui18n.so.67.1
> -rw-r--r-- 1 root root  3160560 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicui18n.so.67.1
> lrwxrwxrwx 1 root root       16 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicuio.so.67 -> libicuio.so.67.1
> -rw-r--r-- 1 root root    55456 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicuio.so.67.1
> lrwxrwxrwx 1 root root       18 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicutest.so.67 -> libicutest.so.67.1
> -rw-r--r-- 1 root root    81400 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicutest.so.67.1
> lrwxrwxrwx 1 root root       16 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicutu.so.67 -> libicutu.so.67.1
> -rw-r--r-- 1 root root   211880 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicutu.so.67.1
> lrwxrwxrwx 1 root root       16 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicuuc.so.67 -> libicuuc.so.67.1
> -rw-r--r-- 1 root root  1988784 Jul  1  2021
> /usr/lib/x86_64-linux-gnu/libicuuc.so.67.1
>
> Information obtained from 'apt-cache policy libicu67'.
>
> libicu67:
>    Installed: 67.1-7
>    Candidate: 67.1-7
>    Version table:
>   *** 67.1-7 500
>          500 http://mirror.linux.org.au/debian bullseye/main amd64 Packages
>          100 /var/lib/dpkg/status

Same output as for me.

Would you please build icu-test from the following source and run it with
locale "yue-Hans".  Let's see if ucol_open fails with U_INVALID_FORMAT_ERROR
in this case.  There are only two functions in Postgres that call ucol_open
and emit error message "could not open collator for locale" for ICU >=54:

    initdb.c:check_icu_locale
    pg_locale.c:pg_ucol_open (called by pg_import_system_collations)

File icu-test.c:

    #include <stdio.h>

    #include <unicode/ucol.h>
    #include <unicode/uloc.h>

    int main(int argc, char** argv) {
      if (argc < 2) {
        fprintf(stderr, "usage: %s LOCALE\n", argv[0]);
        return 1;
      }

      const char *test_locale = argv[1];

      printf("version = %s\n", U_ICU_VERSION);

      UErrorCode status = U_ZERO_ERROR;
      UCollator *coll = ucol_open(test_locale, &status);
      printf("ucol_open\n  status = %s\n", u_errorName(status));

      if (U_SUCCESS(status)) {
        const char *valid_locale = ucol_getLocaleByType(coll, ULOC_VALID_LOCALE, &status);
        printf("ucol_getLocaleByType\n  status = %s\n  locale = %s\n",
               u_errorName(status), valid_locale);
      }

      ucol_close(coll);
    }

Build and test:

    apt-get install build-essential pkg-config libicu-dev
    gcc -o icu-test icu-test.c $(pkg-config --cflags --libs icu-i18n)
    ./icu-test yue-Hans

I get the following on Debian Bullseye:

    version = 67.1
    ucol_open
      status = U_USING_FALLBACK_WARNING
    ucol_getLocaleByType
      status = U_USING_FALLBACK_WARNING
      locale = zh_Hans

--
Erik