Re: NS runtime feature detection

[Charles A. Roelli]

Thanks for taking the initiative with this.  Maybe it's time to open a bug?


When I try to compile with the patch applied, with this block:

@@ -7349,7 +7365,11 @@ - (void)windowDidEnterFullScreen /* provided for 
direct calls */
     {
       BOOL tbar_visible = FRAME_EXTERNAL_TOOL_BAR (emacsframe) ? YES : NO;
 #ifdef NS_IMPL_COCOA
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
+#if MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_6
+      /* These two values are only defined in 10.7 and above. */
+      int NSApplicationPresentationFullScreen = (1 << 10);
+      int NSApplicationPresentationAutoHideToolbar = (1 << 11);
+#endif
       unsigned val = (unsigned)[NSApp presentationOptions];

while building with:

./configure --with-ns --enable-macos-runtime-feature-detection && make

I got these errors:

nsterm.m: In function ‘-[EmacsView windowDidEnterFullScreen]’:
nsterm.m:7395: error: ‘NSApplicationPresentationFullScreen’ undeclared 
(first use in this function)
nsterm.m:7395: error: (Each undeclared identifier is reported only once
nsterm.m:7395: error: for each function it appears in.)
nsterm.m:7396: error: ‘NSApplicationPresentationAutoHideToolbar’ 
undeclared (first use in this function)

(line numbers are off due to an intervening commit)

I'm confused why the macro call you wrote doesn't prevent this. But
when I change it to #if MAC_OS_X_VERSION_MIN_ALLOWED <=
MAC_OS_X_VERSION_10_6, then it compiles.  This min/max stuff always
confuses me...



On 23/07/2017 14:17, Alan Third wrote:
> On Sat, Jul 22, 2017 at 12:22:30PM +0100, Alan Third wrote:
> > Or perhaps we provide a flag that enables a universal binary build
> > that doesn’t bother about hiding the warnings?
> Attached is a first attempt at this in nsterm.m. I think I’ve got
> everything, but there may be some new variables and things defined
> that I’ve missed which will throw up errors in older macOS versions.
>
> It seems ‘universal binary’ means something specific, so I went with a
> different name.
>
> Use:
>
>      ./configure --with-ns --enable-macos-runtime-feature-detection
>
> It will give a lot of deprecation and unknown method warnings, but
> hopefully that’s all.
>
> If you build normally there should be no (new) warnings or errors.