unity builds: test for build failure when #files is divisible by unit…

…y_size

test cases/common/272 unity/meson.build

@@ -0,0 +1,13 @@
+project('unity', 'c',
+  default_options : [
+    'unity_size=2'])
+
+if get_option('unity') != 'on'
+  error('MESON_SKIP_TEST: unity builds not enabled')
+endif
+
+slib_notinstalled = static_library('slib_notinstalled',
+  # test depends on the number of files being divisible by unity_size
+  ['slib1.c', 'slib2.c'])
+
+slib_installed = static_library('slib_installed', ['slib1.c', 'slib2.c'], link_with : slib_notinstalled, install : true)

test cases/common/272 unity/slib.c

@@ -0,0 +1,6 @@
+int func1(void);
+int func2(void);
+
+int static_lib_func(void) {
+    return func1() + func2();
+}

test cases/common/272 unity/slib1.c

@@ -0,0 +1,3 @@
+int func1(void) {
+    return 1;
+}

test cases/common/272 unity/slib2.c

@@ -0,0 +1,3 @@
+int func2(void) {
+    return 2;
+}

test cases/common/272 unity/test.json

@@ -0,0 +1,5 @@
+{
+  "installed": [
+    {"type": "file", "file": "usr/lib/libslib_installed.a"}
+  ]
+}