[CMake] Disabling exceptions and rtti on VS

[David Cole]

Don't use add_definitions for stuff that aren't "definitions" --
add_definitions should only be used for -D flags to the compiler. It
is a long-standing accidental side effect that you can pass compiler
flags through there, but you shouldn't. Instead, as John already
pointed out in his reply, you should manipulate CMAKE_CXX_FLAGS(_*)
variables (and possibly the _C_ variants as well).


Something like this (sample CMakeLists.txt file) -- see the bottom for
replacing the "/EHsc" with "/EHs-c-" :

cmake_minimum_required(VERSION 2.8)
project(ShowCxxFlags)

message(STATUS "One of the following *should* be empty:")
message(STATUS "CMAKE_CONFIGURATION_TYPES='${CMAKE_CONFIGURATION_TYPES}'")
message(STATUS "CMAKE_BUILD_TYPE='${CMAKE_BUILD_TYPE}'")
message(STATUS "  (but if not, CMAKE_BUILD_TYPE is only used by
Makefile generators)")
message(STATUS "")

message(STATUS "CMAKE_CXX_FLAGS always applies:")
message(STATUS "CMAKE_CXX_FLAGS='${CMAKE_CXX_FLAGS}'")
message(STATUS "")

if(CMAKE_BUILD_TYPE)
  if(CMAKE_GENERATOR MATCHES "Make")
    message(STATUS "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE} applies:")
    message(STATUS
"CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}='${CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}}'")
    message(STATUS "")
  endif()
endif()

if(CMAKE_CONFIGURATION_TYPES)
  message(STATUS "One of the following applies, based on user's choice
of 'Configuration' at build time:")
  foreach(cfg ${CMAKE_CONFIGURATION_TYPES})
    string(TOUPPER "${cfg}" UCFG)
    message(STATUS "CMAKE_CXX_FLAGS_${UCFG}='${CMAKE_CXX_FLAGS_${UCFG}}'")
  endforeach()
  message(STATUS "")
endif()

if(CMAKE_CXX_FLAGS MATCHES "/EHsc ")
  string(REPLACE "/EHsc" "/EHs-c-" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
  message(STATUS "CMAKE_CXX_FLAGS matches /EHsc before end of string
-- replaced...")
  message(STATUS "")
endif()

if(CMAKE_CXX_FLAGS MATCHES "/EHsc$")
  string(REPLACE "/EHsc" "/EHs-c-" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
  message(STATUS "CMAKE_CXX_FLAGS matches /EHsc at end of string --
replaced...")
  message(STATUS "")
endif()

message(STATUS "CMAKE_CXX_FLAGS after possible REPLACE operation:")
message(STATUS "CMAKE_CXX_FLAGS='${CMAKE_CXX_FLAGS}'")
message(STATUS "")




On Fri, Dec 31, 2010 at 9:27 AM, Óscar Fuentes <ofv at wanadoo.es> wrote:
> If /EHs- /EHs-c- are added with add_definitions, the output of the build
> contains warnings:
>
> cl : Command line warning D9025 : overriding '/EHs' with '/EHs-'
> cl : Command line warning D9025 : overriding '/EHc' with '/EHc-'
>
> This is because cmake automatically adds /EHsc to the command line
> options.
>
> How can I remove /EHsc from the command line options before adding
> /EHs-c- ?
>
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