[gimp] configure: shared-mime-info is necessary to detect SVG icons.

[Jehan Pagès <jehanp src gnome org>]

commit 6126437a44ee3d6d2b760a8ac2d616029040b978
Author: Jehan <jehan girinstud io>
Date:   Tue May 2 23:13:22 2017 +0200

    configure: shared-mime-info is necessary to detect SVG icons.
    
    It is apparently not used for file type detection on Windows since
    SVG detection worked correctly without installing this package. But
    vector icons end up broken under MacOS when this is not installed
    (thanks to Kris for testing this!). I assume this is necessary on
    GNU/Linux too.

 configure.ac |   44 +++++++++++++++++++++++++++-----------------
 1 files changed, 27 insertions(+), 17 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 67be213..d6ac406 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2105,26 +2105,36 @@ if test "x$enable_vector_icons" != "xno"; then
   if test "x$have_recommended_gtk" != "x"; then
       enable_vector_icons="no (gtk+-2-0 < gtk_win32_recommended_version)"
   else
-    # Check if librsvg was built with --disable-pixbuf-loader.
-    gdk_pixbuf_moduledir=`$PKG_CONFIG --variable=gdk_pixbuf_moduledir gdk-pixbuf-2.0`
-    # AC_CHECK_FILE macro does not work when cross-compiling and exits with:
-    # error: cannot check for file existence when cross compiling
-    # So let's test files the shell way.
-    if (test "x$platform_win32" = "xyes" &&
-        test -f "$gdk_pixbuf_moduledir/libpixbufloader-svg.dll") ||
-       test -f "$gdk_pixbuf_moduledir/libpixbufloader-svg.so"; then
-      # We must not use $PKG_CONFIG nor PKG_CHECK_* macros because we need
-      # to make sure we use the native pkg-config (in case we cross-compile).
-      if pkg-config --atleast-version=glib_required_version glib-2.0 &&
-         pkg-config gio-2.0; then
-        NATIVE_GLIB_LIBS=`pkg-config --libs gio-2.0 glib-2.0`
-        NATIVE_GLIB_CFLAGS=`pkg-config --cflags gio-2.0 glib-2.0`
-        enable_vector_icons="yes"
+    have_shared_mime_info=""
+    # shared-mime-info is needed to correctly detect SVG files (except on
+    # Windows, apparently).
+    PKG_CHECK_MODULES(MIME_INFO, [shared-mime-info],
+                      have_shared_mime_info="yes", have_shared_mime_info="no")
+    if test "x$have_shared_mime_info" = "xyes" ||
+       test "x$platform_win32" = "xyes"; then
+      # Check if librsvg was built with --disable-pixbuf-loader.
+      gdk_pixbuf_moduledir=`$PKG_CONFIG --variable=gdk_pixbuf_moduledir gdk-pixbuf-2.0`
+      # AC_CHECK_FILE macro does not work when cross-compiling and exits with:
+      # error: cannot check for file existence when cross compiling
+      # So let's test files the shell way.
+      if (test "x$platform_win32" = "xyes" &&
+          test -f "$gdk_pixbuf_moduledir/libpixbufloader-svg.dll") ||
+         test -f "$gdk_pixbuf_moduledir/libpixbufloader-svg.so"; then
+        # We must not use $PKG_CONFIG nor PKG_CHECK_* macros because we need
+        # to make sure we use the native pkg-config (in case we cross-compile).
+        if pkg-config --atleast-version=glib_required_version glib-2.0 &&
+           pkg-config gio-2.0; then
+          NATIVE_GLIB_LIBS=`pkg-config --libs gio-2.0 glib-2.0`
+          NATIVE_GLIB_CFLAGS=`pkg-config --cflags gio-2.0 glib-2.0`
+          enable_vector_icons="yes"
+        else
+          enable_vector_icons="no (missing native glib-2.0 > glib_required_version or gio-2.0)"
+        fi
       else
-        enable_vector_icons="no (missing native glib-2.0 > glib_required_version or gio-2.0)"
+        enable_vector_icons="no (librsvg GdkPixbuf loader missing)"
       fi
     else
-      enable_vector_icons="no (librsvg GdkPixbuf loader missing)"
+      enable_vector_icons="no (missing shared-mime-info)"
     fi
   fi
 fi