From 5203c6c7b388e65ceeb7315c5bafa93e71d17a8e Mon Sep 17 00:00:00 2001

From: Peter Lemenkov <lemenkov@gmail.com>

Date: Sat, 2 Oct 2010 17:54:11 +0400

Subject: [PATCH 13/19] Search for possibly missing res_search

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>

---

 CMakeLists.txt                |  6 ++++

 cmake/CheckSymbolExists.cmake | 83 +++++++++++++++++++++++++++++++++++++++++++

 2 files changed, 89 insertions(+)

 create mode 100644 cmake/CheckSymbolExists.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt

index 1302857..34f27e5 100644

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -213,6 +213,12 @@ ELSE(LIBEV_FOUND)

 ENDIF(LIBEV_FOUND)

+# Check for res_search in -lresolv

+include(${CMAKE_SOURCE_DIR}/cmake/CheckSymbolExists.cmake)

+SET(CMAKE_REQUIRED_LIBRARIES resolv)

+CHECK_SYMBOL_EXISTS(res_search resolv.h HAVE_RES_SEARCH)

+MESSAGE(STATUS "Have res_search: ${HAVE_RES_SEARCH} ")

+

 INCLUDE_DIRECTORIES (${SEMS_SOURCE_DIR}/core/ampi)

 INCLUDE_DIRECTORIES (${SEMS_SOURCE_DIR}/core/amci)

 INCLUDE_DIRECTORIES (${SEMS_SOURCE_DIR}/core)

diff --git a/cmake/CheckSymbolExists.cmake b/cmake/CheckSymbolExists.cmake

new file mode 100644

index 0000000..d48b65f

--- /dev/null

+++ b/cmake/CheckSymbolExists.cmake

@@ -0,0 +1,83 @@

+# - Check if the symbol exists in include files

+# CHECK_SYMBOL_EXISTS(SYMBOL FILES VARIABLE)

+#

+#  SYMBOL   - symbol

+#  FILES    - include files to check

+#  VARIABLE - variable to return result

+#

+# The following variables may be set before calling this macro to

+# modify the way the check is run:

+#

+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags

+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)

+#  CMAKE_REQUIRED_INCLUDES = list of include directories

+#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link

+

+#=============================================================================

+# Copyright 2003-2009 Kitware, Inc.

+#

+# Distributed under the OSI-approved BSD License (the "License");

+# see accompanying file Copyright.txt for details.

+#

+# This software is distributed WITHOUT ANY WARRANTY; without even the

+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

+# See the License for more information.

+#=============================================================================

+# (To distributed this file outside of CMake, substitute the full

+#  License text for the above reference.)

+

+MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)

+  IF("${VARIABLE}" MATCHES "^${VARIABLE}$")

+    SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n")

+    SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})

+    IF(CMAKE_REQUIRED_LIBRARIES)

+      SET(CHECK_SYMBOL_EXISTS_LIBS 

+        "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")

+    ELSE(CMAKE_REQUIRED_LIBRARIES)

+      SET(CHECK_SYMBOL_EXISTS_LIBS)

+    ENDIF(CMAKE_REQUIRED_LIBRARIES)

+    IF(CMAKE_REQUIRED_INCLUDES)

+      SET(CMAKE_SYMBOL_EXISTS_INCLUDES

+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")

+    ELSE(CMAKE_REQUIRED_INCLUDES)

+      SET(CMAKE_SYMBOL_EXISTS_INCLUDES)

+    ENDIF(CMAKE_REQUIRED_INCLUDES)

+    FOREACH(FILE ${FILES})

+      SET(CMAKE_CONFIGURABLE_FILE_CONTENT

+        "${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n")

+    ENDFOREACH(FILE)

+    SET(CMAKE_CONFIGURABLE_FILE_CONTENT

+      "${CMAKE_CONFIGURABLE_FILE_CONTENT}\nvoid cmakeRequireSymbol(int dummy,...){(void)dummy;}\nint main()\n{\n#ifndef ${SYMBOL}\n  cmakeRequireSymbol(0,&${SYMBOL});\n#endif\n  return 0;\n}\n")

+

+    CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"

+      "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" @ONLY)

+

+    MESSAGE(STATUS "Looking for ${SYMBOL}")

+    TRY_COMPILE(${VARIABLE}

+      ${CMAKE_BINARY_DIR}

+      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c

+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}

+      CMAKE_FLAGS 

+      -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}

+      "${CHECK_SYMBOL_EXISTS_LIBS}"

+      "${CMAKE_SYMBOL_EXISTS_INCLUDES}"

+      OUTPUT_VARIABLE OUTPUT)

+    IF(${VARIABLE})

+      MESSAGE(STATUS "Looking for ${SYMBOL} - found")

+      SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}")

+      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log 

+        "Determining if the ${SYMBOL} "

+        "exist passed with the following output:\n"

+        "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n"

+        "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")

+    ELSE(${VARIABLE})

+      MESSAGE(STATUS "Looking for ${SYMBOL} - not found.")

+      SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL}")

+      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log 

+        "Determining if the ${SYMBOL} "

+        "exist failed with the following output:\n"

+        "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n"

+        "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")

+    ENDIF(${VARIABLE})

+  ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")

+ENDMACRO(CHECK_SYMBOL_EXISTS)

-- 

1.8.3.1