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[CMake] Override CMake's default flags for GCC/Clang as we were doing

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before 4cc2b292c0.

It's useful to be able to control the defaults and CMake's internal
logic for GCC/Clang is simple enough that doing this makes sense.

It would be nice to do the same for MSVC but CMake's internal
logic is more complicated so for now it's better that we just use
CMake's default.
This commit is contained in:
Dan Liew 2017-04-29 17:45:02 +01:00
parent 2a919cf16e
commit 6e07d6dd2d
2 changed files with 15 additions and 0 deletions
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1
CMakeLists.txt
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@ -24,6 +24,7 @@ if (NOT (EXISTS "${CMAKE_SOURCE_DIR}/src/CMakeLists.txt"))
"``python contrib/cmake/bootstrap.py create``")
endif()
set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cxx_compiler_flags_overrides.cmake")
project(Z3 CXX)
################################################################################

14
contrib/cmake/cmake/cxx_compiler_flags_overrides.cmake Normal file
View file

@ -0,0 +1,14 @@
# This file overrides the default compiler flags for CMake's built-in
# configurations (CMAKE_BUILD_TYPE). Most compiler flags should not be set here.
# The main purpose is to have very fine grained control of the compiler flags.
# We only override the defaults for Clang and GCC right now.
# CMake's MSVC logic is complicated so for now it's better to just inherit CMake's defaults.
if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") OR ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU"))
# Taken from Modules/Compiler/GNU.cmake
set(CMAKE_CXX_FLAGS_INIT "")
set(CMAKE_CXX_FLAGS_DEBUG_INIT "-g -O0")
set(CMAKE_CXX_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG")
set(CMAKE_CXX_FLAGS_RELEASE_INIT "-O3 -DNDEBUG")
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT "-O2 -g -DNDEBUG")
endif()