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gh-154070: Build the curses module wide by capability, not by name #154071

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gh-154070: Build the curses module wide by capability, not by name #154071

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gh-154070: Build the curses module wide by capability, not by name
serhiy-storchaka Jul 19, 2026
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Merge remote-tracking branch 'upstream/main' into curses-wide-by-capa…
serhiy-storchaka Jul 22, 2026
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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Build/2026-07-19-12-16-31.gh-issue-154070.f5da07.rst
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Original file line number Diff line number Diff line change
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Build the :mod:`curses` module against a wide-character capable ncurses
even when it is not named ``ncursesw`` -- for example the pkgsrc ncurses on
NetBSD and illumos, or the system ncurses on macOS. Such a library
previously produced a narrow build.
32 changes: 24 additions & 8 deletions configure
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37 changes: 21 additions & 16 deletions configure.ac
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Expand Up @@ -7248,22 +7248,27 @@ AS_VAR_IF([ac_sys_system], [Darwin], [
dnl pyconfig.h defines _XOPEN_SOURCE=700
PANEL_CFLAGS=$(echo $PANEL_CFLAGS | sed 's/-D_XOPEN_SOURCE=600//g')

dnl Native curses ("curses") may be wide-character capable (e.g. on NetBSD)
dnl even though it is not ncursesw. Probe for the wide API; if present, build
dnl the module against it like ncursesw by defining HAVE_NCURSESW. ncursesw
dnl already defines HAVE_NCURSESW, and ncurses must stay narrow, so only the
dnl native backend is probed here.
AS_VAR_IF([with_curses], [curses], [
AC_CACHE_CHECK([whether curses supports wide characters],
[ac_cv_curses_wide],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([_CURSES_INCLUDES], [[
cchar_t wcval;
setcchar(&wcval, L"x", A_NORMAL, 0, NULL);
add_wch(&wcval);
]])],
[ac_cv_curses_wide=yes],
[ac_cv_curses_wide=no])])
dnl A curses that is not named "ncursesw" can still be wide-character capable:
dnl the system curses of NetBSD, or an ncurses built with --enable-widec that
dnl keeps the plain name (pkgsrc, macOS). Probe for the wide API and, if
dnl present, build the module wide by defining HAVE_NCURSESW. The "ncursesw"
dnl backend already defines it, so only the other backends are probed.
AS_CASE([$with_curses], [ncursesw|no], [], [
WITH_SAVE_ENV([
dnl Use the adjusted CURSES_CFLAGS (e.g. macOS's -D_XOPEN_SOURCE_EXTENDED)
dnl so the wide-character declarations are visible to the probe.
AS_VAR_APPEND([CPPFLAGS], [" $CURSES_CFLAGS"])
AC_CACHE_CHECK([whether curses supports wide characters],
[ac_cv_curses_wide],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([_CURSES_INCLUDES], [[
cchar_t wcval;
setcchar(&wcval, L"x", A_NORMAL, 0, NULL);
add_wch(&wcval);
]])],
[ac_cv_curses_wide=yes],
[ac_cv_curses_wide=no])])
])
dnl HAVE_NCURSESW marks the wide (cchar_t) curses API; its template comes
dnl from the ncursesw pkg-config check above, so no description here.
AS_VAR_IF([ac_cv_curses_wide], [yes], [AC_DEFINE([HAVE_NCURSESW], [1])])
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