[CMake] How to specify compiler only flags

[Daniel Schepler]

As I understand it, configuration-specific properties are deprecated in favor of generator expressions.  For example:

target_compile_options(openjpeg PRIVATE
  $<$<CONFIG:Release>:-ffast-math>)
-- 
Daniel Schepler
________________________________________
From: CMake [cmake-bounces at cmake.org] on behalf of Orion Poplawski [orion at cora.nwra.com]
Sent: Tuesday, April 28, 2015 1:15 PM
To: CMake Mailing List
Subject: [CMake] How to specify compiler only flags

I'm trying to patch the CMakeLists.txt for openjpeg.  Currently it does:

   # Do not use ffast-math for all build, it would produce incorrect results,
only set for release:
   SET(CMAKE_C_FLAGS_RELEASE "-ffast-math ${CMAKE_C_FLAGS_RELEASE}")


Unfortunately, CMAKE_C_FLAGS are also used in link step, which for -ffast-math
causes problems for users of the shared library.

I'm unable to find an equivalent flag that is for compiling only.  I see I can
set the COMPILE_FLAGS property for the library, but there does not appear to
be a COMPILE_FLAGS_RELEASE property that would only set it for the Release
build type.

Suggestions?

--
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       orion at nwra.com
Boulder, CO 80301                   http://www.nwra.com
--

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