# ECMAddAppIcon

Add icons to executable files and packages.

    ecm_add_app_icon(<sources_var>
                     ICONS <icon> [<icon> [...]]
                     [SIDEBAR_ICONS <icon> [<icon> [...]] # Since 5.49
                     [OUTFILE_BASENAME <name>]) # Since 5.49
                     )

The given icons, whose names must match the pattern:

    <size>-<other_text>.png

will be added to the executable target whose sources are specified by `<sources_var>` on platforms that support it (Windows and Mac OS X). Other icon files are ignored but on Mac SVG files can be supported and it is thus possible to mix those with png files in a single macro call.

`<size>` is a numeric pixel size (typically 16, 32, 48, 64, 128 or 256). `<other_text>` can be any other text. See the platform notes below for any recommendations about icon sizes.

`SIDEBAR_ICONS` can be used to add Mac OS X sidebar icons to the generated iconset. They are used when a folder monitored by the application is dragged into Finder’s sidebar. Since 5.49.

`OUTFILE_BASENAME` will be used as the basename for the icon file. If you specify it, the icon file will be called `<OUTFILE_BASENAME>.icns` on Mac OS X and `<OUTFILE_BASENAME>.ico` on Windows. If you don’t specify it, it defaults to `<sources_var>.<ext>`. Since 5.49.

Windows notes
  - Icons are compiled into the executable using a resource file.
  - Icons may not show up in Windows Explorer if the executable target does not have the `WIN32_EXECUTABLE` property set.
  - One of the tools png2ico (See `FindPng2Ico`) or icotool (see `FindIcoTool`) is required.
  - Supported sizes: 16, 24, 32, 48, 64, 128, 256, 512 and 1024.
Mac OS X notes
  - The executable target must have the `MACOSX_BUNDLE` property set.
  - Icons are added to the bundle.
  - If the ksvg2icns tool from KIconThemes is available, .svg and .svgz files are accepted; the first that is converted successfully to .icns will provide the application icon. SVG files are ignored otherwise.
  - The tool iconutil (provided by Apple) is required for bitmap icons.
  - Supported sizes: 16, 32, 64, 128, 256 (and 512, 1024 after OS X 10.9).
  - At least a 128x128px (or an SVG) icon is required.
  - Larger sizes are automatically used to substitute for smaller sizes on “Retina” (high-resolution) displays. For example, a 32px icon, if provided, will be used as a 32px icon on standard-resolution displays, and as a 16px-equivalent icon (with an “@2x” tag) on high-resolution displays. That is why you should provide 64px and 1024px icons although they are not supported anymore directly. Instead they will be used as 32px@2x and 512px@2x. ksvg2icns handles this internally.
  - This function sets the `MACOSX_BUNDLE_ICON_FILE` variable to the name of the generated icns file, so that it will be used as the `MACOSX_BUNDLE_ICON_FILE` target property when you call `add_executable`.
  - Sidebar icons should typically provided in 16, 32, 64, 128 and 256px.

Since 1.7.0.