meson: allow to fallback to use libxcrypt.pc or glibc's libcrypt

Some distributions still use glibc's libcrypt. In that case, libcrypt.pc
does not exist and dependency() will fail.
Also, even if libxcrypt is used, there may not be a symlink
from libcrypt.pc to libxcrypt.pc. So, let's add a secondary name.

Follow-up for d625f717db6e151fd78742593c35eaba4cd2841d.

Fixes #28289.

diff --git a/meson.build b/meson.build
index afda4c0431ae9e38f0625e61d027bde71178d3f4..661663f12f5e14a34cf149164e3c40dd2ca941f6 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -1060,7 +1060,11 @@ threads = dependency('threads')
 librt = cc.find_library('rt')
 libm = cc.find_library('m')
 libdl = cc.find_library('dl')
-libcrypt = dependency('libcrypt')
+libcrypt = dependency('libcrypt', 'libxcrypt', required : false)
+if not libcrypt.found()
+        # fallback to use find_library() if libcrypt is provided by glibc, e.g. for LibreELEC.
+        libcrypt = cc.find_library('crypt')
+endif
 libcap = dependency('libcap')
 
 # On some architectures, libatomic is required. But on some installations,