Make CMake release flags similar to Makefile build

.travis.yml

@@ -163,7 +163,7 @@ jobs:
           packages:
             - g++-5
       install:
-        - cmake -H. -Bbuild '-DCMAKE_BUILD_TYPE=Release' '-DCMAKE_CXX_FLAGS_RELEASE=-O3' '-DCMAKE_CXX_FLAGS=-Wall -Wpedantic -Werror' '-DCMAKE_CXX_COMPILER=g++-5' '-Dsat_impl=glucose'
+        - cmake -H. -Bbuild '-DCMAKE_BUILD_TYPE=Release' '-DCMAKE_CXX_COMPILER=g++-5' '-Dsat_impl=glucose'
         - cmake --build build -- -j4
       script: (cd build; ctest -V -L CORE)
 
@@ -174,7 +174,7 @@ jobs:
         - BUILD_SYSTEM=cmake
         - CCACHE_CPP2=yes
       install:
-        - cmake -H. -Bbuild '-DCMAKE_BUILD_TYPE=Release' '-DCMAKE_CXX_FLAGS_RELEASE=-O3' '-DCMAKE_CXX_FLAGS=-Wall -Wpedantic -Werror' '-DCMAKE_OSX_ARCHITECTURES=x86_64'
+        - cmake -H. -Bbuild '-DCMAKE_BUILD_TYPE=Release' '-DCMAKE_OSX_ARCHITECTURES=x86_64'
         - cmake --build build -- -j4
       script: (cd build; ctest -V -L CORE)
 

CMakeLists.txt

@@ -13,6 +13,18 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR
+   "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU"
+)
+    #   Ensure NDEBUG is not set for release builds
+    set(CMAKE_CXX_FLAGS_RELEASE "-O2")
+    #   Enable lots of warnings
+    set(CMAKE_CXX_FLAGS "-Wall -Wpedantic -Werror")
+elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
+    #   This would be the place to enable warnings for Windows builds, although
+    #   config.inc doesn't seem to do that currently
+endif()
+
 add_subdirectory(src)
 
 set(enable_cbmc_tests on CACHE BOOL "Whether CBMC tests should be enabled")