meson: Improve crypto support build

There are multiple conditional steps for building encryption
support. This is because the support varies from `gnutls` or `nss`.

This has been improved to reduce the number of used conditions.

libnm-core/meson.build

@@ -177,11 +177,8 @@ shared_nm_libnm_core_intern_dep = declare_dependency(
 ###############################################################################
 
 deps = [
-  dl_dep,
+  crypto_dep,
   libnm_utils_base_dep,
-  libudev_dep,
-  uuid_dep,
-  shared_nm_libnm_core_intern_dep,
 ]
 
 cflags = [
@@ -189,37 +186,26 @@ cflags = [
   '-DNETWORKMANAGER_COMPILATION=NM_NETWORKMANAGER_COMPILATION_LIBNM_CORE',
 ]
 
+libnm_crypto = static_library(
+  'nm-crypto',
+  sources: 'nm-crypto-@0@.c'.format(crypto),
+  dependencies: deps,
+  c_args: cflags,
+)
+
+deps = [
+  dl_dep,
+  libnm_utils_base_dep,
+  libudev_dep,
+  uuid_dep,
+  shared_nm_libnm_core_intern_dep,
+]
+
 if enable_json_validation
   libnm_core_sources += files('nm-json.c')
   deps += jansson_dep
 endif
 
-if (crypto_gnutls_dep.found())
-  libnm_crypto_gnutls = static_library(
-    'nm-crypto-gnutls',
-    sources: [ 'nm-crypto-gnutls.c' ],
-    dependencies: deps + [ crypto_gnutls_dep ],
-    c_args: cflags,
-  )
-endif
-
-if (crypto_nss_dep.found())
-  libnm_crypto_nss = static_library(
-    'nm-crypto-nss',
-    sources: [ 'nm-crypto-nss.c' ],
-    dependencies: deps + [ crypto_nss_dep ],
-    c_args: cflags,
-  )
-endif
-
-if crypto == 'gnutls'
-  libnm_crypto = libnm_crypto_gnutls
-elif crypto == 'nss'
-  libnm_crypto = libnm_crypto_nss
-else
-  error('bug')
-endif
-
 libnm_core_sources_all =  libnm_core_sources
 libnm_core_sources_all += libnm_core_enum
 libnm_core_sources_all += nm_meta_setting_source

meson.build

@@ -475,14 +475,18 @@ if enable_polkit_agent
 endif
 config_h.set10('WITH_POLKIT_AGENT', enable_polkit_agent)
 
-crypto_gnutls_dep = dependency('gnutls', version: '>= 2.12', required: false)
-crypto_nss_dep = dependency('nss', required: false)
 
 crypto = get_option('crypto')
 if crypto == 'nss'
-  assert(crypto_nss_dep.found(), 'Requires gnutls crypto support')
+    crypto_dep = dependency('nss', required: false)
+    assert(crypto_dep.found(), 'Requires nss crypto support')
 elif crypto == 'gnutls'
-  assert(crypto_gnutls_dep.found(), 'Requires gnutls crypto support')
+    crypto_dep = dependency(
+      'gnutls',
+      version: '>= 2.12',
+      required: false,
+    )
+    assert(crypto_dep.found(), 'Requires gnutls crypto support')
 else
   error('bug')
 endif
@@ -961,7 +965,7 @@ output += '  code coverage: ' + get_option('b_coverage').to_string() + '\n'
 output += '  LTO: ' + enable_lto.to_string() + '\n'
 output += '  Linker garbage collection: ' + enable_ld_gc.to_string() + '\n'
 output += '  JSON validation for libnm: ' + enable_json_validation.to_string() + '\n'
-output += '  crypto: ' + crypto + ' (have-gnutls: ' + crypto_gnutls_dep.found().to_string() + ', have-nss: ' + crypto_nss_dep.found().to_string() + ')\n'
+output += '  crypto: ' + crypto + '\n'
 output += '  sanitizers: ' + get_option('b_sanitize') + '\n'
 output += '  Mozilla Public Suffix List: ' + enable_libpsl.to_string() + '\n'
 output += '  vapi: ' + enable_vapi.to_string() + '\n'