[CMake] add_compile_options query

[Alexander Biddulph]

I have tried specifying the parameters with both single and double quotes, both options raise errors on the command line.

With no quotes:
FAILED: /usr/bin/gcc -march=broadwell -mtune=broadwell -m64 -mabm -madx
  -maes -mavx -mavx2 -mbmi -mbmi2 -mcx16 -mf16c -mfma -mfsgsbase -mfxsr
  -mlzcnt -mmmx -mmovbe -mpclmul -mpopcnt -mprfchw -mrdrnd -mrdseed -msahf
  -msse -msse2 -msse3 -msse4 -msse4.1 -msse4.2 -mssse3 -mxsave -mxsaveopt
  --param l1-cache-size=24 l1-cache-line-size=64 l2-cache-size=512 -o
  CMakeFiles/cmTC_59f68.dir/testCCompiler.c.o -c testCCompiler.c

  gcc: error: l1-cache-line-size=64: No such file or directory

  gcc: error: l2-cache-size=512: No such file or directory


With single quotes:
FAILED: /usr/bin/gcc -march=broadwell -mtune=broadwell -m64 -mabm -madx
  -maes -mavx -mavx2 -mbmi -mbmi2 -mcx16 -mf16c -mfma -mfsgsbase -mfxsr
  -mlzcnt -mmmx -mmovbe -mpclmul -mpopcnt -mprfchw -mrdrnd -mrdseed -msahf
  -msse -msse2 -msse3 -msse4 -msse4.1 -msse4.2 -mssse3 -mxsave -mxsaveopt
  "'--param" "l1-cache-size=24'" "l1-cache-line-size=64'"
  "l2-cache-size=512'" -o CMakeFiles/cmTC_dad73.dir/testCCompiler.c.o -c
  testCCompiler.c

  gcc: error: '--param: No such file or directory

  gcc: error: l1-cache-size=24': No such file or directory

  gcc: error: l1-cache-line-size=64': No such file or directory

  gcc: error: l2-cache-size=512': No such file or directory

With double quotes:
FAILED: /usr/bin/gcc -march=broadwell -mtune=broadwell -m64 -mabm -madx
  -maes -mavx -mavx2 -mbmi -mbmi2 -mcx16 -mf16c -mfma -mfsgsbase -mfxsr
  -mlzcnt -mmmx -mmovbe -mpclmul -mpopcnt -mprfchw -mrdrnd -mrdseed -msahf
  -msse -msse2 -msse3 -msse4 -msse4.1 -msse4.2 -mssse3 -mxsave -mxsaveopt
  "--param l1-cache-size=24" "--param l1-cache-line-size=64" "--param
  l2-cache-size=512" -o CMakeFiles/cmTC_09224.dir/testCCompiler.c.o -c
  testCCompiler.c

  gcc: error: unrecognized command line option ‘--param l1-cache-size=24’

  gcc: error: unrecognized command line option ‘--param
  l1-cache-line-size=64’

  gcc: error: unrecognized command line option ‘--param
  l2-cache-size=512’

If I only specify one of the flags (with no single/double quotes) gcc accepts the flag.


Thanks,

Alex


________________________________
From: CHEVRIER, Marc <marc.chevrier at sap.com>
Sent: Friday, 12 August 2016 9:51:49 PM
To: Alexander Biddulph; cmake at cmake.org
Subject: Re: [CMake] add_compile_options query


Specify flags as strings rather than lists (i.e. add quotes):
    add_compile_options("--param l1-cache-size=24")
    add_compile_options("--param l1-cache-line-size=64")
    add_compile_options("--param l2-cache-size=512")



On 12/08/16 11:08, "CMake on behalf of Alex Biddulph" <cmake-bounces at cmake.org on behalf of c3124185 at uon.edu.au> wrote:

    Hi,

    I am trying to add some GCC compiler optimisation flags using the add_compile_options directive but am running into some issues due to the nature of the flags.

    There are 3 flags that I am trying to set:
    --param l1-cache-size=24
    --param l1-cache-line-size=64
    --param l2-cache-size=512

    If I try to add these as:
    add_compile_options(--param l1-cache-size=24)
    add_compile_options(--param l1-cache-line-size=64)
    add_compile_options(--param l2-cache-size=512)

    Then the resulting portion of the command line is:
    --param l1-cache-size=24 l1-cache-line-size=64 l2-cache-size=512

    That is, only one of the '--param's is maintained, but all 3 need to be maintained in order for GCC to understand the flags.

    Is it possible to use add_compile_options to set these flags? Or is there another more effective method? I would like to avoid adding them to CFLAGS and CXXFLAGS if at all possible.

    Thanks in advance,
    Alex
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