[Qemu-block] [PATCH v2 7/9] configure: Link test before auto-enabling GTK libraries

[Philippe Mathieu-Daudé]

Similarly to commit a73e82ef912, test the libraries link correctly
before considering them as usable.

This fixes using ./configure --static on Ubuntu 18.04:

  $ make subdir-lm32-softmmu
  [...]
  LINK    lm32-softmmu/qemu-system-lm32
  /usr/bin/ld: cannot find -lgtk-3
  /usr/bin/ld: cannot find -latk-bridge-2.0
  /usr/bin/ld: cannot find -latspi
  /usr/bin/ld: cannot find -lsystemd
  /usr/bin/ld: cannot find -lgdk-3
  /usr/bin/ld: cannot find -lwayland-cursor
  /usr/bin/ld: cannot find -lwayland-egl
  /usr/bin/ld: cannot find -lwayland-client
  /usr/bin/ld: cannot find -lepoxy
  /usr/bin/ld: cannot find -lgraphite2
  collect2: error: ld returned 1 exit status
  Makefile:204: recipe for target 'qemu-system-lm32' failed
  make[1]: *** [qemu-system-lm32] Error 1

  $ fgrep gdk config-host.mak
  GTK_LIBS=-lgtk-3 -latk-bridge-2.0 -latspi -ldbus-1 -lpthread -lsystemd 
-lgdk-3 -lgio-2.0 -lXinerama -lXi -lXrandr -lXcursor -lXcomposite -lXdamage 
-lXfixes -lxkbcommon -lwayland-cursor -lwayland-egl -lwayland-client -lepoxy 
-ldl -lpangocairo-1.0 -lpangoft2-1.0 -lharfbuzz -lm -lgraphite2 -lpango-1.0 -lm 
-latk-1.0 -lcairo-gobject -lcairo -lz -lpixman-1 -lfontconfig -lexpat 
-lfreetype -lexpat -lfreetype -lpng16 -lm -lz -lm -lxcb-shm -lxcb-render 
-lXrender -lXext -lX11 -lpthread -lxcb -lXau -lXdmcp -lgdk_pixbuf-2.0 -lm 
-lpng16 -lm -lz -lm -lz -lgio-2.0 -lz -lresolv -lselinux -lmount -lgmodule-2.0 
-pthread -ldl -lgobject-2.0 -lffi -lglib-2.0 -pthread -lpcre -pthread -lX11 
-lpthread -lxcb -lXau -lXdmcp
VTE_CFLAGS=-pthread -I/usr/include/vte-2.91 -I/usr/include/gtk-3.0 
-I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 
-I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include 
-I/usr/include/gtk-3.0 -I/usr/include/cairo -I/usr/include/pango-1.0 
-I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 
-I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 
-I/usr/include/libpng16 -I/usr/include/freetype2 -I/usr/include/libpng16 
-I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 
-I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/p11-kit-1

  $ lsb_release -cri
  Distributor ID: Ubuntu
  Release:        18.04
  Codename:       bionic

Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
---
 configure | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index a3da5adf80..ffd269b34f 100755
--- a/configure
+++ b/configure
@@ -2782,7 +2782,17 @@ if test "$gtk" != "no"; then
             gtk_cflags="$gtk_cflags $x11_cflags"
             gtk_libs="$gtk_libs $x11_libs"
         fi
-        gtk="yes"
+        # Packaging for the static libraries is not always correct.
+        # At least ubuntu 18.04 ships only shared libraries.
+        write_c_skeleton
+        if ! compile_prog "$gtk_cflags" "$gtk_libs" ; then
+            if test "$gtk" = "yes" ; then
+              error_exit "gtk check failed."
+            fi
+            gtk="no"
+        else
+            gtk="yes"
+        fi
     elif test "$gtk" = "yes"; then
         feature_not_found "gtk" "Install gtk3-devel"
     else
-- 
2.20.1