Re: [Qemu-devel] [PATCH] Fix legacy ncurses detection.

[Samuel Thibault <samuel.thibault@gnu.org>]

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Hello,

Cornelia Huck, on Wed 09 Nov 2016 10:12:36 +0100, wrote:
> On Wed, 9 Nov 2016 10:04:02 +0100
> Samuel Thibault <samuel.thibault@gnu.org> wrote:
> > Please post config.log so we can have a clue about what is going
> > wrong.  All these error messages are meant to be reported verbatim, not
> > reinterpreted :)
> 
> Well, no error here - just curses=no.

The errors are in config.log, that's what one is supposed to look at
when there are configure issues.

> config.log attached. The difference seems to be that the statement you
> added in the sample program causes a real error instead of a warning.

Yes, that was on purpose, to avoid the -Werror issue. It's expected to
happen because /usr/include/curses.h doesn't seem to have the wide
support. But -I/usr/include/ncursesw/curses.h is supposed to have. But:

> cc -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -Wendif-labels -Wmissing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-declaration -Wold-style-definition -Wtype-limits -fstack-protector-all -I/usr/include/libpng16 -I/usr/include/ncursesw -o config-temp/qemu-conf.exe config-temp/qemu-conf.c -m64 -g :-lncursesw:-lcursesw
> cc: error: :-lncursesw:-lcursesw: No such file or directory

That's what the real issue is in your case.  I now see why, could you
try the attached patch instead?

Samuel

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commit ea32127ca780b0945827776bf27f99383529621c
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Tue Nov 8 20:57:27 2016 +0100

    Fix cursesw detection
    
    On systems which do not provide ncursesw.pc and whose /usr/include/curses.h
    does not include wide support, we should not only try with no -I, i.e.
    /usr/include, but also with -I/usr/include/ncursesw.
    
    To properly detect for wide support with and without -Werror, we need to
    check for the presence of e.g. the WACS_DEGREE macro.
    
    We also want to stop at the first curses_inc_list configuration which works,
    and make sure to set IFS to : at each new loop.
    
    Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

diff --git a/configure b/configure
index fd6f898..bac7bcc 100755
--- a/configure
+++ b/configure
@@ -2926,7 +2926,7 @@ if test "$curses" != "no" ; then
     curses_inc_list="$($pkg_config --cflags ncurses 2>/dev/null):"
     curses_lib_list="$($pkg_config --libs ncurses 2>/dev/null):-lpdcurses"
   else
-    curses_inc_list="$($pkg_config --cflags ncursesw 2>/dev/null):"
+    curses_inc_list="$($pkg_config --cflags ncursesw 2>/dev/null):-I/usr/include/ncursesw:"
     curses_lib_list="$($pkg_config --libs ncursesw 2>/dev/null):-lncursesw:-lcursesw"
   fi
   curses_found=no
@@ -2941,6 +2941,7 @@ int main(void) {
   resize_term(0, 0);
   addwstr(L"wide chars\n");
   addnwstr(&wch, 1);
+  add_wch(WACS_DEGREE);
   return s != 0;
 }
 EOF
@@ -2954,7 +2955,11 @@ EOF
         libs_softmmu="$curses_lib $libs_softmmu"
         break
       fi
+      IFS=:
     done
+    if test "$curses_found" = yes ; then
+      break
+    fi
   done
   unset IFS
   if test "$curses_found" = "yes" ; then