Add static and shared linkage test (closes #153)

.circleci/config.yml

@@ -51,6 +51,28 @@ commands:
             -DCMAKE_BUILD_TYPE=Release \
             .
       - run: make -j 16 VERBOSE=1
+  run-linkage-tests:
+    steps:
+      - run:
+          name: Linkage test (static)
+          command: |
+            BUILD=$(mktemp -d) INST=$(mktemp -d) LB=$(mktemp -d)
+            cmake -S . -B "$BUILD" -DCMAKE_BUILD_TYPE=Debug -DSANITIZE=OFF -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX="$INST"
+            cmake --build "$BUILD" --parallel
+            cmake --install "$BUILD"
+            cmake -S test/linkage -B "$LB" -DCMAKE_PREFIX_PATH="$INST"
+            cmake --build "$LB"
+            ctest --test-dir "$LB" -VV
+      - run:
+          name: Linkage test (shared)
+          command: |
+            BUILD=$(mktemp -d) INST=$(mktemp -d) LB=$(mktemp -d)
+            cmake -S . -B "$BUILD" -DCMAKE_BUILD_TYPE=Debug -DSANITIZE=OFF -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX="$INST"
+            cmake --build "$BUILD" --parallel
+            cmake --install "$BUILD"
+            cmake -S test/linkage -B "$LB" -DCMAKE_PREFIX_PATH="$INST"
+            cmake --build "$LB"
+            LD_LIBRARY_PATH="$INST/lib" ctest --test-dir "$LB" -VV
   test:
     steps:
       - run: ctest -VV --output-junit ctest_out.xml
@@ -109,6 +131,7 @@ jobs:
             cat Testing/Temporary/MemoryChecker*
             exit 1
           fi;
+      - run-linkage-tests
 
   build-and-test-clang:
     machine:
@@ -122,6 +145,7 @@ jobs:
       - linux-setup
       - build
       - test
+      - run-linkage-tests
 
   build-and-test-sanitized:
     machine:

test/linkage/CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.5)
+project(libcbor_linkage_test C)
+
+find_package(libcbor REQUIRED)
+
+add_executable(linkage_test main.c)
+target_link_libraries(linkage_test libcbor::libcbor)
+
+enable_testing()
+add_test(NAME linkage_test COMMAND linkage_test)

test/linkage/main.c

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2014-2020 Pavel Kalvoda <me@pavelkalvoda.com>
+ *
+ * libcbor is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+/*
+ * Standalone linkage test: verifies that libcbor can be found via
+ * find_package and linked against from an external project, for both
+ * static and shared library builds.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include "cbor.h"
+
+int main(void) {
+  /* Encode an integer and decode it back */
+  cbor_item_t* item = cbor_build_uint8(42);
+  assert(item != NULL);
+
+  unsigned char buf[16];
+  size_t len = cbor_serialize(item, buf, sizeof(buf));
+  assert(len > 0);
+
+  struct cbor_load_result result;
+  cbor_item_t* decoded = cbor_load(buf, len, &result);
+  assert(decoded != NULL);
+  assert(result.error.code == CBOR_ERR_NONE);
+  assert(cbor_get_uint8(decoded) == 42);
+
+  cbor_decref(&item);
+  cbor_decref(&decoded);
+
+  printf("libcbor linkage test passed (version %s)\n", CBOR_VERSION);
+  return 0;
+}