diff --git a/CMakeLists.txt b/CMakeLists.txt
index f2e98ba..cf9a5ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,10 +12,15 @@ endif ()
 message(STATUS "Build type ${CMAKE_BUILD_TYPE}")
 
 option(SC_BUILD_TEST "Build tests" ON)
-if(NOT SC_BUILD_TEST)
-  message(STATUS "Turned off building tests because SC is a subproject.")
-  message(STATUS "Turned off coverage because SC is a subproject.")
-endif()
+if (NOT SC_BUILD_TEST)
+    message(STATUS "Turned off building tests because SC is a subproject.")
+    message(STATUS "Turned off coverage because SC is a subproject.")
+endif ()
+
+if (NOT ${CMAKE_BUILD_TYPE} MATCHES "Debug" AND NOT ${CMAKE_BUILD_TYPE} MATCHES "Coverage")
+    SET(SC_BUILD_TEST OFF CACHE BOOL "Turn off sc_lib tests" FORCE)
+    message(STATUS "Not building tests, SC tests are supported in Debug build only.")
+endif ()
 
 add_subdirectory(array)
 add_subdirectory(buffer)
@@ -43,47 +48,47 @@ add_subdirectory(uri)
 # --------------------------------------------------------------------------- #
 # --------------------- Test Configuration Start ---------------------------- #
 # --------------------------------------------------------------------------- #
-if(SC_BUILD_TEST)
-# ----------------------- - Code Coverage Start ----------------------------- #
+if (SC_BUILD_TEST)
+    # ----------------------- - Code Coverage Start ----------------------------- #
 
-  if (${CMAKE_BUILD_TYPE} MATCHES "Coverage")
-      if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
-          add_compile_options(--coverage)
-          link_libraries(gcov)
-      else()
-          message(FATAL_ERROR "Only GCC is supported for coverage")
-      endif()
-  endif ()
+    if (${CMAKE_BUILD_TYPE} MATCHES "Coverage")
+        if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+            add_compile_options(--coverage)
+            link_libraries(gcov)
+        else ()
+            message(FATAL_ERROR "Only GCC is supported for coverage")
+        endif ()
+    endif ()
 
-  add_custom_target(coverage)
-  add_custom_command(
-          TARGET coverage
-          COMMAND lcov --capture --directory .
-          --output-file coverage.info --rc lcov_branch_coverage=1 --rc lcov_excl_br_line='assert'
-          COMMAND lcov --remove coverage.info '/usr/*' '*example*' '*test*'
-          --output-file coverage.info --rc lcov_branch_coverage=1 --rc lcov_excl_br_line='assert'
-          COMMAND lcov --list coverage.info --rc lcov_branch_coverage=1 --rc lcov_excl_br_line='assert'
-  )
+    add_custom_target(coverage)
+    add_custom_command(
+            TARGET coverage
+            COMMAND lcov --capture --directory .
+            --output-file coverage.info --rc lcov_branch_coverage=1 --rc lcov_excl_br_line='assert'
+            COMMAND lcov --remove coverage.info '/usr/*' '*example*' '*test*'
+            --output-file coverage.info --rc lcov_branch_coverage=1 --rc lcov_excl_br_line='assert'
+            COMMAND lcov --list coverage.info --rc lcov_branch_coverage=1 --rc lcov_excl_br_line='assert'
+    )
 
-# -------------------------- Code Coverage End ------------------------------ #
+    # -------------------------- Code Coverage End ------------------------------ #
 
-  SET(MEMORYCHECK_COMMAND_OPTIONS
-          "-q --log-fd=2 --trace-children=yes --track-origins=yes       \
+    SET(MEMORYCHECK_COMMAND_OPTIONS
+            "-q --log-fd=2 --trace-children=yes --track-origins=yes       \
            --leak-check=full --show-leak-kinds=all \
            --error-exitcode=255")
 
-  add_custom_target(valgrind ${CMAKE_COMMAND}
-          -E env CTEST_OUTPUT_ON_FAILURE=1
-          ${CMAKE_CTEST_COMMAND} -C $<CONFIG>
-          --overwrite MemoryCheckCommandOptions=${MEMORYCHECK_COMMAND_OPTIONS}
-          --verbose -T memcheck WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+    add_custom_target(valgrind ${CMAKE_COMMAND}
+            -E env CTEST_OUTPUT_ON_FAILURE=1
+            ${CMAKE_CTEST_COMMAND} -C $<CONFIG>
+            --overwrite MemoryCheckCommandOptions=${MEMORYCHECK_COMMAND_OPTIONS}
+            --verbose -T memcheck WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
 
-  add_custom_target(check ${CMAKE_COMMAND}
-          -E env CTEST_OUTPUT_ON_FAILURE=1
-          ${CMAKE_CTEST_COMMAND} -C $<CONFIG> --verbose
-          WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+    add_custom_target(check ${CMAKE_COMMAND}
+            -E env CTEST_OUTPUT_ON_FAILURE=1
+            ${CMAKE_CTEST_COMMAND} -C $<CONFIG> --verbose
+            WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
 
-  add_dependencies(coverage check)
+    add_dependencies(coverage check)
 
 endif ()
 # ----------------------- Test Configuration End ---------------------------- #
diff --git a/condition/sc_cond.c b/condition/sc_cond.c
index 6458fa9..9dc65c9 100644
--- a/condition/sc_cond.c
+++ b/condition/sc_cond.c
@@ -159,6 +159,7 @@ void sc_cond_signal(struct sc_cond *cond, void *data)
     // This won't fail as long as we pass correct params.
     rc = pthread_cond_signal(&cond->cond);
     assert(rc == 0);
+    (void) rc;
 
     pthread_mutex_unlock(&cond->mtx);
 }
@@ -174,6 +175,7 @@ void *sc_cond_wait(struct sc_cond *cond)
         // This won't fail as long as we pass correct params.
         rc = pthread_cond_wait(&cond->cond, &cond->mtx);
         assert(rc == 0);
+        (void) rc;
     }
 
     data = cond->data;
diff --git a/mutex/sc_mutex.c b/mutex/sc_mutex.c
index 1103167..ff718df 100644
--- a/mutex/sc_mutex.c
+++ b/mutex/sc_mutex.c
@@ -79,6 +79,7 @@ int sc_mutex_init(struct sc_mutex *mtx)
     // This won't fail as long as we pass correct param.
     rv = pthread_mutexattr_destroy(&attr);
     assert(rv == 0);
+    (void) rv;
 
     return rc != 0 ? -1 : 0;
 }
@@ -98,6 +99,7 @@ void sc_mutex_lock(struct sc_mutex *mtx)
     // This won't fail as long as we pass correct param.
     rc = pthread_mutex_lock(&mtx->mtx);
     assert(rc == 0);
+    (void) rc;
 }
 
 void sc_mutex_unlock(struct sc_mutex *mtx)
@@ -107,6 +109,7 @@ void sc_mutex_unlock(struct sc_mutex *mtx)
     // This won't fail as long as we pass correct param.
     rc = pthread_mutex_unlock(&mtx->mtx);
     assert(rc == 0);
+    (void) rc;
 }
 
 #endif
diff --git a/signal/sc_signal.c b/signal/sc_signal.c
index d9efb0d..7c465a1 100644
--- a/signal/sc_signal.c
+++ b/signal/sc_signal.c
@@ -510,12 +510,13 @@ int sc_signal_init()
 
 void sc_signal_log(int fd, char *buf, size_t len, char *fmt, ...)
 {
-    int written;
+    int written, rc;
     va_list args;
 
     va_start(args, fmt);
     written = sc_signal_vsnprintf(buf, len, fmt, args);
     va_end(args);
 
-    (void) write(fd, buf, (size_t) written);
+    rc = write(fd, buf, (size_t) written);
+    (void) rc;
 }
diff --git a/thread/sc_thread.c b/thread/sc_thread.c
index b17f454..04dc988 100644
--- a/thread/sc_thread.c
+++ b/thread/sc_thread.c
@@ -115,7 +115,7 @@ int sc_thread_start(struct sc_thread *thread, void *(*fn)(void *), void *arg)
 
     rc = pthread_attr_init(&attr);
     if (rc != 0) {
-        strncpy(thread->err, strerror(rc), sizeof(thread->err));
+        strncpy(thread->err, strerror(rc), sizeof(thread->err) - 1);
         return -1;
     }
 
@@ -124,7 +124,7 @@ int sc_thread_start(struct sc_thread *thread, void *(*fn)(void *), void *arg)
 
     rc = pthread_create(&thread->id, &attr, fn, arg);
     if (rc != 0) {
-        strncpy(thread->err, strerror(rc), sizeof(thread->err));
+        strncpy(thread->err, strerror(rc), sizeof(thread->err) - 1);
     }
 
     // This may only fail with EINVAL.
@@ -144,7 +144,7 @@ int sc_thread_join(struct sc_thread *thread, void **ret)
 
     rc = pthread_join(thread->id, &val);
     if (rc != 0) {
-        strncpy(thread->err, strerror(rc), sizeof(thread->err));
+        strncpy(thread->err, strerror(rc), sizeof(thread->err) - 1);
     }
 
     thread->id = 0;
diff --git a/time/sc_time.c b/time/sc_time.c
index 5bdda8a..0080ebe 100644
--- a/time/sc_time.c
+++ b/time/sc_time.c
@@ -54,6 +54,7 @@ uint64_t sc_time_ms()
 
     rc = clock_gettime(CLOCK_REALTIME, &ts);
     assert(rc == 0);
+    (void) rc;
 
     return ts.tv_sec * 1000 + (uint64_t)(ts.tv_nsec / 10e6);
 #endif
@@ -76,6 +77,7 @@ uint64_t sc_time_ns()
 
     rc = clock_gettime(CLOCK_REALTIME, &ts);
     assert(rc == 0);
+    (void) rc;
 
     return ts.tv_sec * (uint64_t)1000000000 + ts.tv_nsec;
 #endif
@@ -101,6 +103,7 @@ uint64_t sc_time_mono_ms()
 
     rc = clock_gettime(CLOCK_MONOTONIC, &ts);
     assert(rc == 0);
+    (void) rc;
 
     return (uint64_t)((uint64_t) ts.tv_sec * 1000 +
                      (uint64_t) ts.tv_nsec / 1000000);
@@ -126,6 +129,7 @@ uint64_t sc_time_mono_ns()
 
     rc = clock_gettime(CLOCK_MONOTONIC, &ts);
     assert(rc == 0);
+    (void) rc;
 
     return ((uint64_t) ts.tv_sec * 1000000000 + (uint64_t) ts.tv_nsec);
 #endif