MIME-Version: 1.0
From: Jianghua Yang <yjhjstz@gmail.com>
Date: Thu, 19 Mar 2026 11:06:17 -0700
Message-ID: 
 <CAAZLFmS6_si5W8LqSynj5J1uK6Xhe5Q7Ucg7LE1PZ8OqO9kvCA@mail.gmail.com>
Subject: [PATCH] Fix build failure on macOS 26.2 SDK due to missing
 nl_langinfo_l declaration
To: pgsql-hackers@lists.postgresql.org
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Hi,

  Building PostgreSQL against the macOS 26.2 SDK (Xcode 26 beta) fails
  with the following error:

    src/port/chklocale.c:326:8: error: call to undeclared function
    'nl_langinfo_l'; ISO C99 and later do not support implicit function
    declarations [-Wimplicit-function-declaration]
        sys = nl_langinfo_l(CODESET, loc);

  == Root Cause ==

  macOS 26.2 SDK changed the structure of <langinfo.h>.  In previous
  SDK versions, nl_langinfo_l() was declared unconditionally.  In the
  new SDK, it is only exposed when _USE_EXTENDED_LOCALES_ is defined,
  guarded behind a conditional include of <xlocale/_langinfo.h>:

    /* macOS 26.2 SDK: langinfo.h */
    #include <_langinfo.h>          /* nl_langinfo() only */

    #ifdef _USE_EXTENDED_LOCALES_
    #include <xlocale/_langinfo.h>  /* nl_langinfo_l() */
    #endif

  PostgreSQL's chklocale.c only includes <langinfo.h> directly, so
  nl_langinfo_l() is no longer visible on macOS 26.2.

  == Fix ==

  Include <xlocale.h> explicitly on Apple platforms.  This header
  declares nl_langinfo_l() unconditionally and is the standard way
  to access locale-specific extensions on macOS.

  Tested on macOS 26.2 (darwin 25.3) with Apple Clang 17.

  Patch attached.

  Regards,
  Jianghua Yang

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<div dir=3D"ltr">Hi,<br><br>=C2=A0 Building PostgreSQL against the macOS 26=
.2 SDK (Xcode 26 beta) fails<br>=C2=A0 with the following error:<br><br>=C2=
=A0 =C2=A0 src/port/chklocale.c:326:8: error: call to undeclared function<b=
r>=C2=A0 =C2=A0 &#39;nl_langinfo_l&#39;; ISO C99 and later do not support i=
mplicit function<br>=C2=A0 =C2=A0 declarations [-Wimplicit-function-declara=
tion]<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 sys =3D nl_langinfo_l(CODESET, loc);<b=
r><br>=C2=A0 =3D=3D Root Cause =3D=3D<br><br>=C2=A0 macOS 26.2 SDK changed =
the structure of &lt;langinfo.h&gt;.=C2=A0 In previous<br>=C2=A0 SDK versio=
ns, nl_langinfo_l() was declared unconditionally.=C2=A0 In the<br>=C2=A0 ne=
w SDK, it is only exposed when _USE_EXTENDED_LOCALES_ is defined,<br>=C2=A0=
 guarded behind a conditional include of &lt;xlocale/_langinfo.h&gt;:<br><b=
r>=C2=A0 =C2=A0 /* macOS 26.2 SDK: langinfo.h */<br>=C2=A0 =C2=A0 #include =
&lt;_langinfo.h&gt; =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/* nl_langinfo() only=
 */<br><br>=C2=A0 =C2=A0 #ifdef _USE_EXTENDED_LOCALES_<br>=C2=A0 =C2=A0 #in=
clude &lt;xlocale/_langinfo.h&gt; =C2=A0/* nl_langinfo_l() */<br>=C2=A0 =C2=
=A0 #endif<br><br>=C2=A0 PostgreSQL&#39;s chklocale.c only includes &lt;lan=
ginfo.h&gt; directly, so<br>=C2=A0 nl_langinfo_l() is no longer visible on =
macOS 26.2.<br><br>=C2=A0 =3D=3D Fix =3D=3D<br><br>=C2=A0 Include &lt;xloca=
le.h&gt; explicitly on Apple platforms.=C2=A0 This header<br>=C2=A0 declare=
s nl_langinfo_l() unconditionally and is the standard way<br>=C2=A0 to acce=
ss locale-specific extensions on macOS.<br><br>=C2=A0 Tested on macOS 26.2 =
(darwin 25.3) with Apple Clang 17.<br><br>=C2=A0 Patch attached.<br><br>=C2=
=A0 Regards,<br>=C2=A0 Jianghua Yang</div>

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