build: Require usage of C89

This requires the usage of the C89 standard for all source files. It
also fixes a wrong check for the compiler flags (was checking this for
CXX compiler instead of the C compiler).

4 files changed, 16 insertions, 12 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1ca05c95..c3495e6a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.1.0)
 set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
 #set(CMAKE_VERBOSE_MAKEFILE ON)
 
-project(ouroboros)
+project(ouroboros C)
 
 include(GitVersionGen)
 GIT_VERSION_GEN()
@@ -27,13 +27,16 @@ message(STATUS "Package URL is:             ${PACKAGE_URL}")
 message(STATUS "Package bug-report address: ${PACKAGE_BUGREPORT}")
 message(STATUS "Package install prefix:     ${CMAKE_INSTALL_PREFIX}")
 
+# Enable C89 standard
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c89")
+
 include(FindPkgConfig)
 
 include(CompilerUtils)
-test_and_set_cxx_compiler_flag_global(-Wall)
-test_and_set_cxx_compiler_flag_global(-Werror)
-test_and_set_cxx_compiler_flag_global(-Wundef)
-test_and_set_cxx_compiler_flag_global(-fmax-errors=1)
+test_and_set_c_compiler_flag_global(-Wall)
+test_and_set_c_compiler_flag_global(-Werror)
+test_and_set_c_compiler_flag_global(-Wundef)
+test_and_set_c_compiler_flag_global(-fmax-errors=1)
 
 configure_file(
   "${CMAKE_CURRENT_SOURCE_DIR}/ouroboros.pc.in"
@@ -46,7 +49,7 @@ add_subdirectory(include)
 add_subdirectory(src)
 add_subdirectory(tests)
 
-# We may have to move this to the subdirs
+# FIXME: We may have to move this to the subdirs
 include(MacroAddCompileFlags)
 if (CMAKE_BUILD_TYPE MATCHES Debug)
    MACRO_ADD_COMPILE_FLAGS(ipcpd -DCONFIG_OUROBOROS_DEBUG)
diff --git a/cmake/CompilerUtils.cmake b/cmake/CompilerUtils.cmake
index 99d9b662..5cea44b6 100644
--- a/cmake/CompilerUtils.cmake
+++ b/cmake/CompilerUtils.cmake
@@ -1,15 +1,15 @@
-include(CheckCXXCompilerFlag)
+include(CheckCCompilerFlag)
 
-function(test_and_set_cxx_compiler_flag_global _flag)
+function(test_and_set_c_compiler_flag_global _flag)
 
   string(REGEX REPLACE "-" "_" _sflag ${_flag})
-  check_cxx_compiler_flag(${_flag} COMPILER_SUPPORTS_FLAG_${_sflag})
+  check_c_compiler_flag(${_flag} COMPILER_SUPPORTS_FLAG_${_sflag})
 
   if(COMPILER_SUPPORTS_FLAG_${_sflag})
     message(STATUS "Compiler supports flag ${_flag}, added globally")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" PARENT_SCOPE)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_flag}" PARENT_SCOPE)
   else(${_retval})
       message(STATUS "Compiler does not support flag ${_flag}, discarded")
   endif()
 
-endfunction(test_and_set_cxx_compiler_flag_global)
+endfunction(test_and_set_c_compiler_flag_global)
diff --git a/include/ouroboros/common.h b/include/ouroboros/common.h
index 90431208..09900a1f 100644
--- a/include/ouroboros/common.h
+++ b/include/ouroboros/common.h
@@ -26,6 +26,7 @@
 #include <stdint.h>
 #include <unistd.h>
 #include <stdbool.h>
+#include <errno.h>
 
 typedef uint32_t port_id_t;
 
diff --git a/src/lib/bitmap.c b/src/lib/bitmap.c
index cb414e7f..3aaa422c 100644
--- a/src/lib/bitmap.c
+++ b/src/lib/bitmap.c
@@ -187,7 +187,7 @@ int rbmp_release(struct rbmp * b,
 
         rid = id - b->offset;
 
-        bitmap_clear(b->bitmap, id);
+        bitmap_clear(b->bitmap, rid);
 
         return 0;
 }