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Add support for ICU 4.2

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Supporting ICU 4.2 seems useful because it ships with CentOS 6.

Versions before ICU 4.6 don't support pkg-config, so document an
installation method without using pkg-config.

In ICU 4.2, ucol_getKeywordsForLocale() sometimes returns values that
will not be accepted by uloc_toLanguageTag().  Skip loading keyword
variants in that version.

Reported-by: Victor Wagner <vitus@wagner.pp.ru>
This commit is contained in:
Peter Eisentraut
2017-08-01 10:49:55 -04:00
parent f85f88bcc2
commit eccead9ed4
2 changed files with 30 additions and 3 deletions
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22
doc/src/sgml/installation.sgml
View File

@ -774,10 +774,26 @@ su - postgres
Build with support for
the <productname>ICU</productname><indexterm><primary>ICU</></>
library. This requires the <productname>ICU4C</productname> package
as well
as <productname>pkg-config</productname><indexterm><primary>pkg-config</></>
to be installed. The minimum required version
of <productname>ICU4C</productname> is currently 4.6.
of <productname>ICU4C</productname> is currently 4.2.
</para>
<para>
By default,
<productname>pkg-config</productname><indexterm><primary>pkg-config</></>
will be used to find the required compilation options. This is
supported for <productname>ICU4C</productname> version 4.6 and later.
For older versions, or if <productname>pkg-config</productname> is
not available, the variables <envar>ICU_CFLAGS</envar>
and <envar>ICU_LIBS</envar> can be specified
to <filename>configure</filename>, like in this example:
<programlisting>
./configure ... --with-icu ICU_CFLAGS='-I/some/where/include' ICU_LIBS='-L/some/where/lib -licui18n -licuuc -licudata'
</programlisting>
(If <productname>ICU4C</productname> is in the default search path
for the compiler, then you still need to specify a nonempty string in
order to avoid use of <productname>pkg-config</productname>, for
example, <literal>ICU_CFLAGS=' '</literal>.)
</para>
</listitem>
</varlistentry>