interpreter: add feature.require()

Add a method to perform a logical AND on a feature object.  The method
also takes care of raising an error if 'enabled' is ANDed with false.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

4 files changed, 17 insertions, 0 deletions

diff --git a/test cases/common/192 feature option/meson.build b/test cases/common/192 feature option/meson.build
index 030ccbcf9..6d26debf8 100644
--- a/test cases/common/192 feature option/meson.build
+++ b/test cases/common/192 feature option/meson.build
@@ -14,16 +14,21 @@ assert(required_opt.enabled(), 'Should be enabled option')
 assert(not required_opt.disabled(), 'Should be enabled option')
 assert(not required_opt.auto(), 'Should be enabled option')
 assert(required_opt.allowed(), 'Should be enabled option')
+assert(required_opt.require(true, error_message: 'xyz').enabled(), 'Should be enabled option')
 
 assert(not optional_opt.enabled(), 'Should be auto option')
 assert(not optional_opt.disabled(), 'Should be auto option')
 assert(optional_opt.auto(), 'Should be auto option')
 assert(optional_opt.allowed(), 'Should be auto option')
+assert(optional_opt.require(true).auto(), 'Should be auto option')
+assert(optional_opt.require(false, error_message: 'xyz').disabled(), 'Should be disabled auto option')
 
 assert(not disabled_opt.enabled(), 'Should be disabled option')
 assert(disabled_opt.disabled(), 'Should be disabled option')
 assert(not disabled_opt.auto(), 'Should be disabled option')
 assert(not disabled_opt.allowed(), 'Should be disabled option')
+assert(disabled_opt.require(true).disabled(), 'Should be disabled option')
+assert(disabled_opt.require(false, error_message: 'xyz').disabled(), 'Should be disabled option')
 
 dep = dependency('threads', required : required_opt)
 assert(dep.found(), 'Should find required "threads" dep')
diff --git a/test cases/failing/111 feature require/meson.build b/test cases/failing/111 feature require/meson.build
new file mode 100644
index 000000000..d976ae8d6
--- /dev/null
+++ b/test cases/failing/111 feature require/meson.build
@@ -0,0 +1,2 @@
+project('no fallback', 'c')
+foo = get_option('reqfeature').require(false, error_message: 'frobnicator not available')
diff --git a/test cases/failing/111 feature require/meson_options.txt b/test cases/failing/111 feature require/meson_options.txt
new file mode 100644
index 000000000..d6f2ce656
--- /dev/null
+++ b/test cases/failing/111 feature require/meson_options.txt
@@ -0,0 +1,2 @@
+option('reqfeature', type : 'feature', value : 'enabled', description : 'A required feature')
+
diff --git a/test cases/failing/111 feature require/test.json b/test cases/failing/111 feature require/test.json
new file mode 100644
index 000000000..7c4640de0
--- /dev/null
+++ b/test cases/failing/111 feature require/test.json
@@ -0,0 +1,8 @@
+{
+  "stdout": [
+    {
+      "match": "re",
+      "line": ".*/meson\\.build:2:0: ERROR: Feature reqfeature cannot be enabled: frobnicator not available"
+    }
+  ]
+}