Use dlopen to check for library presence on Mac OS

Leont · bingos · commit 8b924f65a048 · 2020-12-18T13:27:25.000Z
Without this fix, it will erroneously believe that system provided
libraries aren't available at all.
diff --git a/lib/ExtUtils/Liblist/Kid.pm b/lib/ExtUtils/Liblist/Kid.pm
@@ -174,6 +174,10 @@ sub _unix_os2_ext {
                 && -f ( $fullname = "$thispth/lib$thislib.$Config_dlext" ) )
             {
             }
+            elsif ( defined( $Config_dlext ) && $^O eq 'darwin' && require DynaLoader && defined &DynaLoader::dl_load_file
+                && DynaLoader::dl_load_file( $fullname = "$thispth/lib$thislib.$Config_dlext", 0 ) )
+            {
+            }
             elsif ( -f ( $fullname = "$thispth/$thislib$Config_libext" ) ) {
             }
             elsif ( -f ( $fullname = "$thispth/lib$thislib.dll$Config_libext" ) ) {

Original file line number	Diff line number	Diff line change
`@@ -174,6 +174,10 @@ sub _unix_os2_ext {`
`174`	`174`	`&& -f ( $fullname = "$thispth/lib$thislib.$Config_dlext" ) )`
`175`	`175`	`{`
`176`	`176`	`}`
	`177`	`+ elsif ( defined( $Config_dlext ) && $^O eq 'darwin' && require DynaLoader && defined &DynaLoader::dl_load_file`
	`178`	`+ && DynaLoader::dl_load_file( $fullname = "$thispth/lib$thislib.$Config_dlext", 0 ) )`
	`179`	`+ {`
	`180`	`+ }`
`177`	`181`	`elsif ( -f ( $fullname = "$thispth/$thislib$Config_libext" ) ) {`
`178`	`182`	`}`
`179`	`183`	`elsif ( -f ( $fullname = "$thispth/lib$thislib.dll$Config_libext" ) ) {`