1 files changed, 100 insertions, 41 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 650cfe3ac4..0df17a21f2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,16 +25,18 @@ endif(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
 ########################################################################
 # Project setup
 ########################################################################
+# Make sure this version matches ${GR_CMAKE_MIN_VERSION} (a variable can't be
+# used here).
 cmake_minimum_required(VERSION 2.6)
 project(gnuradio CXX C)
 enable_testing()
 
-#make sure our local CMake Modules path comes first
+# Make sure our local CMake Modules path comes first
 list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_SOURCE_DIR}/cmake/Modules)
 
 include(GrBuildTypes)
 
-#select the release build type by default to get optimization flags
+# Select the release build type by default to get optimization flags
 if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE "Release")
    message(STATUS "Build type not specified: defaulting to release.")
@@ -46,45 +48,27 @@ message(STATUS "Build type set to ${CMAKE_BUILD_TYPE}.")
 # Set the version information here
 set(VERSION_INFO_MAJOR_VERSION 3)
 set(VERSION_INFO_API_COMPAT    7)
-set(VERSION_INFO_MINOR_VERSION 11)
-set(VERSION_INFO_MAINT_VERSION 1)
+set(VERSION_INFO_MINOR_VERSION 12)
+set(VERSION_INFO_MAINT_VERSION git)
 include(GrVersion) #setup version info
 
-# Append -O2 optimization flag for Debug builds (Not on MSVC since conflicts with RTC1 flag)
-IF (NOT MSVC)
-    SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O2")
-    SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O2")
-ENDIF()
+# Minimum dependency versions for central dependencies:
+set(GR_BOOST_MIN_VERSION "1.48")
+set(GR_SWIG_MIN_VERSION "2.0.4")
+set(GR_CMAKE_MIN_VERSION "2.8.12")
+set(GR_MAKO_MIN_VERSION "0.4.2")
+set(GR_PYTHON_MIN_VERSION "2.7")
+#set(GR_PYTHON3_MIN_VERSION "3.x") # Py3k not yet supported
+set(GR_CPPUNIT_MIN_VERSION "1.12.1")
+set(GCC_MIN_VERSION "4.4.0")
+set(CLANG_MIN_VERSION "3.3.0")
+set(APPLECLANG_MIN_VERSION "500")
 
-# Set C/C++ standard for all targets
-# NOTE: Starting with cmake v3.1 this should be used:
-# set(CMAKE_C_STANDARD 90)
-# set(CMAKE_CXX_STANDARD 98)
-
-IF(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")
-ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")
-ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
-    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")
-ELSE()
-    message(warning "C++ standard could not be set because compiler is not GNU, Clang or MSVC.")
-ENDIF()
-
-IF(CMAKE_C_COMPILER_ID STREQUAL "GNU")
-    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
-ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "Clang")
-    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
-ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
-    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11")
-ELSE()
-    message(warning "C standard could not be set because compiler is not GNU, Clang or MSVC.")
-ENDIF()
-
-# Set cmake policies.
+########################################################################
+# Configure CMake policies
+########################################################################
 # This will suppress developer warnings during the cmake process that can occur
 # if a newer cmake version than the minimum is used.
-
 if(POLICY CMP0026)
     cmake_policy(SET CMP0026 OLD)
 endif()
@@ -99,6 +83,81 @@ if(POLICY CMP0046)
 endif()
 
 ########################################################################
+# Compiler version setup
+########################################################################
+# Append -O2 optimization flag for Debug builds (Not on MSVC since conflicts with RTC1 flag)
+IF (NOT MSVC)
+    SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O2")
+    SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O2")
+ENDIF()
+
+# Check compiler version against our minimum
+IF(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    IF(DEFINED CMAKE_CXX_COMPILER_VERSION)
+        IF(${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS ${GCC_MIN_VERSION})
+            MESSAGE(WARNING "\nThe compiler selected to build GNU Radio (GCC version ${CMAKE_CXX_COMPILER_VERSION} : ${CMAKE_CXX_COMPILER}) is older than that officially supported (${GCC_MIN_VERSION} minimum). This build may or not work. We highly recommend using a more recent GCC version.")
+        ENDIF()
+    ELSE()
+        MESSAGE(WARNING "\nCannot determine the version of the compiler selected to build GNU Radio (GCC : ${CMAKE_CXX_COMPILER}). This build may or not work. We highly recommend using GCC version ${GCC_MIN_VERSION} or more recent.")
+    ENDIF()
+ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    EXECUTE_PROCESS(COMMAND
+        ${CMAKE_CXX_COMPILER} -v
+        RESULT_VARIABLE _res ERROR_VARIABLE _err
+        ERROR_STRIP_TRAILING_WHITESPACE)
+    IF(${_res} STREQUAL "0")
+        # output is in error stream
+        STRING(REGEX MATCH "^Apple.*" IS_APPLE ${_err})
+        IF("${IS_APPLE}" STREQUAL "")
+            SET(MIN_VERSION ${CLANG_MIN_VERSION})
+            SET(APPLE_STR "")
+            # retrieve the compiler's version from it
+            STRING(REGEX MATCH "clang version [0-9.]+" CLANG_OTHER_VERSION ${_err})
+            STRING(REGEX MATCH "[0-9.]+" CLANG_VERSION ${CLANG_OTHER_VERSION})
+        ELSE()
+            SET(MIN_VERSION ${APPLECLANG_MIN_VERSION})
+            SET(APPLE_STR "Apple ")
+            # retrieve the compiler's version from it
+            STRING(REGEX MATCH "(clang-[0-9.]+)" CLANG_APPLE_VERSION ${_err})
+            STRING(REGEX MATCH "[0-9.]+" CLANG_VERSION ${CLANG_APPLE_VERSION})
+        ENDIF()
+        IF(${CLANG_VERSION} VERSION_LESS "${MIN_VERSION}")
+            MESSAGE(WARNING "\nThe compiler selected to build GNU Radio (${APPLE_STR}Clang version ${CLANG_VERSION} : ${CMAKE_CXX_COMPILER}) is older than that officially supported (${MIN_VERSION} minimum). This build may or not work. We highly recommend using Apple Clang version ${APPLECLANG_MIN_VERSION} or more recent, or Clang version ${CLANG_MIN_VERSION} or more recent.")
+        ENDIF()
+    ELSE()
+        MESSAGE(WARNING "\nCannot determine the version of the compiler selected to build GNU Radio (${APPLE_STR}Clang : ${CMAKE_CXX_COMPILER}). This build may or not work. We highly recommend using Apple Clang version ${APPLECLANG_MIN_VERSION} or more recent, or Clang version ${CLANG_MIN_VERSION} or more recent.")
+    ENDIF()
+ELSE()
+    MESSAGE(status "Skipping compiler version check.")
+ENDIF()
+
+# Configure C++ and C standards
+IF(CMAKE_VERSION VERSION_LESS "3.1")
+    IF(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")
+    ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")
+    ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")
+    ELSE()
+        MESSAGE(warning "C++ standard could not be set because compiler is not GNU, Clang or MSVC.")
+    ENDIF()
+
+    IF(CMAKE_C_COMPILER_ID STREQUAL "GNU")
+        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
+    ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "Clang")
+        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
+    ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
+        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11")
+    ELSE()
+        MESSAGE(warning "C standard could not be set because compiler is not GNU, Clang or MSVC.")
+    ENDIF()
+ELSE()
+    SET(CMAKE_C_STANDARD 90)
+    SET(CMAKE_CXX_STANDARD 98)
+ENDIF()
+
+########################################################################
 # Environment setup
 ########################################################################
 IF(NOT DEFINED BOOST_ROOT)
@@ -283,13 +342,13 @@ include(GrBoost)
 ########################################################################
 # Enable python component
 ########################################################################
-find_package(PythonLibs 2)
+find_package(PythonLibs ${GR_PYTHON_MIN_VERSION})
 find_package(SWIG)
 
 if(SWIG_FOUND)
-    # Minimum SWIG version required is 1.3.31
     set(SWIG_VERSION_CHECK FALSE)
-    if("${SWIG_VERSION}" VERSION_GREATER "1.3.30")
+    if("${SWIG_VERSION}" VERSION_EQUAL ${GR_SWIG_MIN_VERSION} OR
+       "${SWIG_VERSION}" VERSION_GREATER ${GR_SWIG_MIN_VERSION})
         set(SWIG_VERSION_CHECK TRUE)
     endif()
 endif(SWIG_FOUND)
@@ -301,7 +360,7 @@ GR_REGISTER_COMPONENT("python-support" ENABLE_PYTHON
     SWIG_VERSION_CHECK
 )
 
-find_package(CppUnit)
+find_package(CppUnit ${GR_CPPUNIT_MIN_VERSION})
 GR_REGISTER_COMPONENT("testing-support" ENABLE_TESTING
     CPPUNIT_FOUND
 )
@@ -413,7 +472,7 @@ GR_LOGGING()
 # Distribute the README file
 ########################################################################
 install(
-    FILES README README.hacking
+    FILES README.md README.hacking
     DESTINATION ${GR_PKG_DOC_DIR}
     COMPONENT "docs"
 )