Restoring compatibility with CMake 2.6

* The UNSET command didn't exist back then, but using SET with no value does the same thing
* CMake 2.6 doesn't like nested parantheses in IF statements, so tweak IF/ELSE statements

7 files changed, 26 insertions, 24 deletions

diff --git a/host/CMakeLists.txt b/host/CMakeLists.txt
index 2c574c54f..ba16ce894 100644
--- a/host/CMakeLists.txt
+++ b/host/CMakeLists.txt
@@ -149,7 +149,7 @@ IF(MSVC)
     IF(BOOST_ALL_DYN_LINK)
         ADD_DEFINITIONS(-DBOOST_ALL_DYN_LINK) #setup boost auto-linking in msvc
     ELSE(BOOST_ALL_DYN_LINK)
-        UNSET(BOOST_REQUIRED_COMPONENTS) #empty components list for static link
+        SET(BOOST_REQUIRED_COMPONENTS) #empty components list for static link
     ENDIF(BOOST_ALL_DYN_LINK)
 ENDIF(MSVC)
 
@@ -262,8 +262,8 @@ STRING(REPLACE ";" " " UHD_PC_LIBS "${UHD_PC_LIBS}")
 
 #unset these vars to avoid hard-coded paths to cross environment
 IF(CMAKE_CROSSCOMPILING)
-    UNSET(UHD_PC_CFLAGS)
-    UNSET(UHD_PC_LIBS)
+    SET(UHD_PC_CFLAGS)
+    SET(UHD_PC_LIBS)
 ENDIF(CMAKE_CROSSCOMPILING)
 
 IF(NOT LIBUHD_PKG AND NOT UHDHOST_PKG)
diff --git a/host/cmake/Modules/FindUSB1.cmake b/host/cmake/Modules/FindUSB1.cmake
index 96e2a5aae..1e8e3ba03 100644
--- a/host/cmake/Modules/FindUSB1.cmake
+++ b/host/cmake/Modules/FindUSB1.cmake
@@ -23,7 +23,7 @@ FIND_PATH(LIBUSB_INCLUDE_DIRS
 set(libusb1_library_names usb-1.0 libusb-1.0)
 
 #libusb-1.0 compatible library on freebsd
-if((CMAKE_SYSTEM_NAME STREQUAL "FreeBSD") OR (CMAKE_SYSTEM_NAME STREQUAL "kFreeBSD"))
+if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR CMAKE_SYSTEM_NAME STREQUAL "kFreeBSD")
     list(APPEND libusb1_library_names usb)
 endif()
 
diff --git a/host/cmake/Modules/UHDPackage.cmake b/host/cmake/Modules/UHDPackage.cmake
index d1c0fc099..a050a083d 100644
--- a/host/cmake/Modules/UHDPackage.cmake
+++ b/host/cmake/Modules/UHDPackage.cmake
@@ -63,22 +63,24 @@ ELSEIF(DEBIAN AND LIBUHDDEV_PKG)
 ELSEIF(DEBIAN AND UHDHOST_PKG)
     SET(CPACK_PACKAGE_FILE_NAME "uhd-host_${TRIMMED_UHD_VERSION}_${CMAKE_SYSTEM_PROCESSOR}")
 ELSE()
-    FIND_PROGRAM(LSB_RELEASE_EXECUTABLE lsb_release)
-    IF((DEBIAN OR REDHAT) AND LSB_RELEASE_EXECUTABLE)
-
-        #extract system information by executing the commands
-        EXECUTE_PROCESS(
-            COMMAND ${LSB_RELEASE_EXECUTABLE} --short --id
-            OUTPUT_VARIABLE LSB_ID OUTPUT_STRIP_TRAILING_WHITESPACE
-        )
-        EXECUTE_PROCESS(
-            COMMAND ${LSB_RELEASE_EXECUTABLE} --short --release
-            OUTPUT_VARIABLE LSB_RELEASE OUTPUT_STRIP_TRAILING_WHITESPACE
-        )
-
-        #set a more sensible package name for this system
-        SET(CPACK_PACKAGE_FILE_NAME "uhd_${UHD_VERSION}_${LSB_ID}-${LSB_RELEASE}-${CMAKE_SYSTEM_PROCESSOR}")
-ENDIF()
+    IF(DEBIAN OR REDHAT)
+        FIND_PROGRAM(LSB_RELEASE_EXECUTABLE lsb_release)
+
+        IF(LSB_RELEASE_EXECUTABLE)
+            #extract system information by executing the commands
+            EXECUTE_PROCESS(
+                COMMAND ${LSB_RELEASE_EXECUTABLE} --short --id
+                OUTPUT_VARIABLE LSB_ID OUTPUT_STRIP_TRAILING_WHITESPACE
+            )
+            EXECUTE_PROCESS(
+                COMMAND ${LSB_RELEASE_EXECUTABLE} --short --release
+                OUTPUT_VARIABLE LSB_RELEASE OUTPUT_STRIP_TRAILING_WHITESPACE
+            )
+
+            #set a more sensible package name for this system
+            SET(CPACK_PACKAGE_FILE_NAME "uhd_${UHD_VERSION}_${LSB_ID}-${LSB_RELEASE}-${CMAKE_SYSTEM_PROCESSOR}")
+        ENDIF(LSB_RELEASE_EXECUTABLE)
+    ENDIF(DEBIAN OR REDHAT)
 ENDIF(DEBIAN AND LIBUHD_PKG)
 
 IF(${CPACK_GENERATOR} STREQUAL NSIS)
diff --git a/host/lib/convert/CMakeLists.txt b/host/lib/convert/CMakeLists.txt
index 473b7f59f..363555f45 100644
--- a/host/lib/convert/CMakeLists.txt
+++ b/host/lib/convert/CMakeLists.txt
@@ -66,7 +66,7 @@ ENDIF()
 
 SET(CMAKE_REQUIRED_FLAGS ${EMMINTRIN_FLAGS})
 CHECK_INCLUDE_FILE_CXX(emmintrin.h HAVE_EMMINTRIN_H)
-UNSET(CMAKE_REQUIRED_FLAGS)
+SET(CMAKE_REQUIRED_FLAGS)
 
 IF(HAVE_EMMINTRIN_H)
     SET(convert_with_sse2_sources
diff --git a/host/lib/ic_reg_maps/CMakeLists.txt b/host/lib/ic_reg_maps/CMakeLists.txt
index 889c725db..c810c04ad 100644
--- a/host/lib/ic_reg_maps/CMakeLists.txt
+++ b/host/lib/ic_reg_maps/CMakeLists.txt
@@ -117,4 +117,4 @@ LIBUHD_PYTHON_GEN_SOURCE(
     ${CMAKE_CURRENT_BINARY_DIR}/lmk04816_regs.hpp
 )
 
-UNSET(LIBUHD_PYTHON_GEN_SOURCE_DEPS)
+SET(LIBUHD_PYTHON_GEN_SOURCE_DEPS)
diff --git a/host/lib/types/CMakeLists.txt b/host/lib/types/CMakeLists.txt
index 7fc6bdd94..f19043c1e 100644
--- a/host/lib/types/CMakeLists.txt
+++ b/host/lib/types/CMakeLists.txt
@@ -31,7 +31,7 @@ CHECK_CXX_SOURCE_COMPILES("
     }
     " HAVE_CLOCK_GETTIME
 )
-UNSET(CMAKE_REQUIRED_LIBRARIES)
+SET(CMAKE_REQUIRED_LIBRARIES)
 
 INCLUDE(CheckCXXSourceCompiles)
 CHECK_CXX_SOURCE_COMPILES("
diff --git a/host/lib/utils/CMakeLists.txt b/host/lib/utils/CMakeLists.txt
index 2252f3221..106e2b650 100644
--- a/host/lib/utils/CMakeLists.txt
+++ b/host/lib/utils/CMakeLists.txt
@@ -84,7 +84,7 @@ CHECK_CXX_SOURCE_COMPILES("
     }
     " HAVE_DLOPEN
 )
-UNSET(CMAKE_REQUIRED_LIBRARIES)
+SET(CMAKE_REQUIRED_LIBRARIES)
 
 CHECK_CXX_SOURCE_COMPILES("
     #define WIN32_LEAN_AND_MEAN