[ITK-dev] How to override optimization compile flag?

[Matt McCormick]

Hi Jon,

This can be disabled by setting

  CMAKE_BUILD_TYPE

to an empty string. The default is "Release", which adds the -O3 flag.

HTH,
Matt

On Mon, May 22, 2017 at 4:55 PM, Lefman, Jonathan
<jonathan.lefman at intel.com> wrote:
> Hi all,
>
>
>
> I am trying to override the -O3 flag using ITK_CXX_DISABLE_OPTIMIZATION_FLAG
> in ITKSetStandardCompilerFlags.cmake. It is not obvious how this is supposed
> to work. When I set ITK_CXX_DISABLE_OPTIMIZATION_FLAG in the cmake command
> or in CMAKE_CXX_FLAGS=’-O0’, the flag is overridden:
>
>
>
> icpc: command line remark #10120: overriding '-O0' with '-O3'
>
>
>
> Example:
>
>
>
> # CMAKE generated file: DO NOT EDIT!
>
> # Generated by "Unix Makefiles" Generator, CMake Version 3.8
>
>
>
> # compile CXX with
> /opt/intel/compilers_and_libraries_2017.1.132/linux/bin/intel64/icpc
>
> CXX_FLAGS =  -O0  -w2 -wd1268 -wd981 -wd383 -wd1418 -wd1419 -wd2259 -wd1572
> -wd424 -Wdisabled-optimization -Wextra -Wformat=2 -Winvalid-pch
> -Wpointer-arith -Wshadow -Wunused -Wwrite-strings -Wno-deprecated
> -Wno-invalid-offsetof -Woverloaded-virtual  -O3 -DNDEBUG –fPIE
>
>
>
> I do see another variable “CXX_HAS_DISABLE_OPTIMIZATION_FLAG” but it is
> reported as unused by cmake. Please let me know the right way to remove the
> -O3 flag. Thanks very much.
>
>
>
> -Jon
>
>
>
>
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