meson: Disable targets requiring pam when it is missing

Several executables require the pam library.
The current behavior in Meson only requires this library when these
executables are explicitly enabled.
Unfortunately, by default, Meson will not throw an error when the
required pam library is missing while still trying to build these
executables.
To fix this, make the pam library a disabler which automatically
disables these executables if it is not found.

Signed-off-by: Jordan Williams <jordan@jwillikers.com>

diff --git a/meson.build b/meson.build
index e65cd9582f9bc164aa459cd193ef1d4835985873..912427c600e603eb2f747eca399f0986e0c98ed3 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -356,16 +356,13 @@ if not lib_crypt.found()
   lib_crypt = cc.find_library('crypt', required : get_option('build-sulogin'))
 endif
 
-lib_pam = cc.find_library('pam', required : get_option('build-login'))
-if not lib_pam.found()
-  lib_pam = cc.find_library('pam', required : get_option('build-chfn-chsh'))
-endif
-if not lib_pam.found()
-  lib_pam = cc.find_library('pam', required : get_option('build-su'))
-endif
-if not lib_pam.found()
-  lib_pam = cc.find_library('pam', required : get_option('build-runuser'))
-endif
+lib_pam = cc.find_library(
+  'pam',
+  disabler : true,
+  required : get_option('build-login').enabled() or \
+    get_option('build-chfn-chsh').enabled() or \
+    get_option('build-su').enabled() or \
+    get_option('build-runuser').enabled())
 if lib_pam.found()
   lib_pam_misc = cc.find_library('pam_misc')
   lib_pam = [lib_pam, lib_pam_misc]