[CMake] cmake Debug builds with icc

[Lucas Wilcox]

Hi,

I am trying to setup Debug and Release builds using icc
(intel's c compiler) on Linux.  It seems as though
   CMAKE_C_FLAGS_DEBUG
   CMAKE_C_FLAGS_MINSIZEREL
   CMAKE_C_FLAGS_RELEASE
   CMAKE_C_FLAGS_RELWITHDEBINFO
are not being set.  Although
   CMAKE_CXX_FLAGS_DEBUG
   CMAKE_CXX_FLAGS_MINSIZEREL
   CMAKE_CXX_FLAGS_RELEASE_INIT
   CMAKE_CXX_FLAGS_RELWITHDEBINFO
are being set correctly.  I tried both
  cmake version 2.6-patch 0 RC-8
  cmake version 2.4-patch 6
with the same results.

Please find below a description of what I tried.
Here is the simple CMakelists.txt that I am using

  cmake_minimum_required(VERSION 2.4)

  project(hello)

  set(HELLOSRC
    hello.c
  )

  add_executable(hello ${HELLOSRC})

where I invoked cmake (version 2.4-patch 6) from the
command line with

% CXX=icpc CC=icc cmake -DCMAKE_BUILD_TYPE:STRING=Debug

I have the following lines in my CMakeCache.txt

  ########################
  # EXTERNAL cache entries
  ########################

  //Path to a program.
  CMAKE_AR:FILEPATH=/usr/bin/ar

  //For backwards compatibility, what version of CMake commands and
  // syntax should this version of CMake allow.
  CMAKE_BACKWARDS_COMPATIBILITY:STRING=2.4

  //No help, variable specified on the command line.
  CMAKE_BUILD_TYPE:STRING=Debug

  //Enable/Disable color output during build.
  CMAKE_COLOR_MAKEFILE:BOOL=ON

  //CXX compiler.
  CMAKE_CXX_COMPILER:FILEPATH=/opt/intel/cce/10.0.023/bin/icpc

  //Flags used by the compiler during all build types.
  CMAKE_CXX_FLAGS:STRING=' '

  //Flags used by the compiler during debug builds.
  CMAKE_CXX_FLAGS_DEBUG:STRING=-g

  //Flags used by the compiler during release minsize builds.
  CMAKE_CXX_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUG

  //Flags used by the compiler during release builds (/MD /Ob1 /Oi
  // /Ot /Oy /Gs will produce slightly less optimized but smaller
  // files).
  CMAKE_CXX_FLAGS_RELEASE:STRING=-O3 -DNDEBUG

  //Flags used by the compiler during Release with Debug Info builds.
  //
  CMAKE_CXX_FLAGS_RELWITHDEBINFO:STRING=-O2 -g

  //C compiler.
  CMAKE_C_COMPILER:FILEPATH=/opt/intel/cce/10.0.023/bin/icc

  //Flags for C compiler.
  CMAKE_C_FLAGS:STRING=' '

  //Flags used by the compiler during debug builds.
  CMAKE_C_FLAGS_DEBUG:STRING=

  //Flags used by the compiler during release minsize builds.
  CMAKE_C_FLAGS_MINSIZEREL:STRING=

  //Flags used by the compiler during release builds (/MD /Ob1 /Oi
  // /Ot /Oy /Gs will produce slightly less optimized but smaller
  // files).
  CMAKE_C_FLAGS_RELEASE:STRING=

  //Flags used by the compiler during Release with Debug Info builds.
  //
  CMAKE_C_FLAGS_RELWITHDEBINFO:STRING=

So it seems CMAKE_C_FLAGS_DEBUG, CMAKE_C_FLAGS_MINSIZEREL,
CMAKE_C_FLAGS_RELEASE, and CMAKE_C_FLAGS_RELWITHDEBINFO
are not being set correctly.  Although it looks like
right platform file is being included, as

  % grep Linux-icpc **/*
  CMakeFiles/Makefile.cmake: "/usr/share/cmake/Modules/Platform/Linux-icpc.cmake"

And Linux-icpc.cmake contains

  SET (CMAKE_C_FLAGS_INIT "")
  SET (CMAKE_C_FLAGS_DEBUG_INIT "-g")
  SET (CMAKE_C_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG")
  SET (CMAKE_C_FLAGS_RELEASE_INIT "-O3 -DNDEBUG")
  SET (CMAKE_C_FLAGS_RELWITHDEBINFO_INIT "-O2 -g")

  SET (CMAKE_CXX_FLAGS_INIT "")
  SET (CMAKE_CXX_FLAGS_DEBUG_INIT "-g")
  SET (CMAKE_CXX_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG")
  SET (CMAKE_CXX_FLAGS_RELEASE_INIT "-O3 -DNDEBUG")
  SET (CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT "-O2 -g")

This could definitely be my fault as I am new to CMake.
Is there something I am doing wrong?  I would appreciate
any comments or suggestions on what I can try to figure
out where the problem is.

Thanks,
Lucas