Add a testcase for linking C and C++ static archives into a shared library

This exercises a regression where the C rather than C++ linker is
chosen, resulting in symbol errors.

Test for #1653

test cases/common/146 C and CPP link/foo.c

@@ -0,0 +1,19 @@
+/* Copyright © 2017 Dylan Baker
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "foo.h"
+
+int forty_two(void) {
+    return 42;
+}

test cases/common/146 C and CPP link/foo.cpp

@@ -0,0 +1,24 @@
+/* Copyright © 2017 Dylan Baker
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <vector>
+#include <boost/assign/list_of.hpp>
+
+namespace {
+    std::vector<int> numbers = boost::assign::list_of(61);
+}
+
+extern "C" int six_one(void) {
+    return numbers[1];
+}

test cases/common/146 C and CPP link/foo.h

@@ -0,0 +1,16 @@
+/* Copyright © 2017 Dylan Baker
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+int forty_two(void);

test cases/common/146 C and CPP link/foo.hpp

@@ -0,0 +1,24 @@
+/* Copyright © 2017 Dylan Baker
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int six_one(void);
+
+#ifdef __cplusplus
+}
+#endif

test cases/common/146 C and CPP link/foobar.c

@@ -0,0 +1,23 @@
+/* Copyright © 2017 Dylan Baker
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "foo.h"
+#include "foo.hpp"
+#include "foobar.h"
+
+void mynumbers(int nums[]) {
+    nums[0] = forty_two();
+    nums[1] = six_one();
+}

test cases/common/146 C and CPP link/foobar.h

@@ -0,0 +1,16 @@
+/* Copyright © 2017 Dylan Baker
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+void mynumbers(int nums[]);

test cases/common/146 C and CPP link/meson.build

@@ -0,0 +1,28 @@
+# Copyright © 2017 Dylan Baker
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+project('C and C++ static link test', ['c', 'cpp'],
+        default_options : ['cpp_std=c++03'])
+
+dep_boost = dependency('boost')
+
+libcppfoo = static_library('cppfoo', ['foo.cpp', 'foo.hpp'],
+                           dependencies : dep_boost)
+libcfoo = static_library('cfoo', ['foo.c', 'foo.h'])
+
+libfoo = shared_library(
+  'foo',
+  ['foobar.c', 'foobar.h'],
+  link_with : [libcfoo, libcppfoo],
+)