Ack! Apparently even the hard way won't work, because apparently one
cannot nest $<IF clauses, viz:
set(CXX_STD_FLAG "$<IF:$<TARGET_PROPERTY:${dictname}_dict,CXX_EXTENSIONS>,\
$<IF:$<EQUAL:11,$<TARGET_PROPERTY:${dictname}_dict,CXX_STANDARD>>,${CMAKE_CXX11_EXTENSION_COMPILE_OPTION},\
$<IF:$<EQUAL:14,$<TARGET_PROPERTY:${dictname}_dict,CXX_STANDARD>>,${CMAKE_CXX14_EXTENSION_COMPILE_OPTION},\
$<IF:$<EQUAL:17,$<TARGET_PROPERTY:${dictname}_dict,CXX_STANDARD>>,${CMAKE_CXX17_EXTENSION_COMPILE_OPTION},\
$<IF:$<EQUAL:20,$<TARGET_PROPERTY:${dictname}_dict,CXX_STANDARD>>,${CMAKE_CXX20_EXTENSION_COMPILE_OPTION},\
${CMAKE_CXX98_EXTENSION_COMPILE_OPTION}>>>>,\
$<IF:$<EQUAL:11,$<TARGET_PROPERTY:${dictname}_dict,CXX_STANDARD>>,${CMAKE_CXX11_STANDARD_COMPILE_OPTION},\
$<IF:$<EQUAL:14,$<TARGET_PROPERTY:${dictname}_dict,CXX_STANDARD>>,${CMAKE_CXX14_STANDARD_COMPILE_OPTION},\
$<IF:$<EQUAL:17,$<TARGET_PROPERTY:${dictname}_dict,CXX_STANDARD>>,${CMAKE_CXX17_STANDARD_COMPILE_OPTION},\
$<IF:$<EQUAL:20,$<TARGET_PROPERTY:${dictname}_dict,CXX_STANDARD>>,${CMAKE_CXX20_STANDARD_COMPILE_OPTION},\
${CMAKE_CXX98_STANDARD_COMPILE_OPTION}>>>>>")
begets:
First parameter to $<IF> must resolve to exactly one '0' or '1' value.
I'm all out of ideas. Any new ones would be appreciated.
Thanks,
Chris.
On 6/1/18 3:00 PM, Chris Green wrote:
Hi,
I was hoping this would work:
$<IF:$<TARGET_PROPERTY:CXX_EXTENSIONS>,${CMAKE_CXX$<TARGET_PROPERTY:CXX_STANDARD>_EXTENSION_COMPILE_OPTION},${CMAKE_CXX$<TARGET_PROPERTY:CXX_STANDARD>_STANDARD_COMPILE_OPTION}>
But apparently it's not legal to calculate a variable name based on a
generator expression. Is there some elegant way to get want I want
here or do I have to check specifically for 98, 11, 14, 17, 20, etc?
Thanks,
Chris.
On 6/1/18 8:27 AM, Chris Green wrote:
Hi,
I'll give this a shot, thank you. Ideally we'd have a generator
expression pick up ${std} from the relevant target property, but I'll
have to play with that since I'm not familiar enough with generator
expressions to know /a priori/ how this will turn out.
Thanks for your help,
Chris.
On 5/30/18 3:12 PM, Chuck Atkins wrote:
Hi Chris.
Try using the the CMAKE_CXX${std}_STANDARD_COMPILE_OPTION variable.
For example, the folowing piece of CMake code:
cmake_minimum_required(VERSION 3.9)
project(foo CXX)
foreach(std IN ITEMS 98 11 14 17)
message("C++${std} std flags:
${CMAKE_CXX${std}_STANDARD_COMPILE_OPTION}")
message("C++${std} ext flags:
${CMAKE_CXX${std}_EXTENSION_COMPILE_OPTION}")
endforeach()
Wll generate for GCC on Linux:
-- The CXX compiler identification is GNU 8.1.1
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
C++98 std flags: -std=c++98
C++98 ext flags: -std=gnu++98
C++11 std flags: -std=c++11
C++11 ext flags: -std=gnu++11
C++14 std flags: -std=c++14
C++14 ext flags: -std=gnu++14
C++17 std flags: -std=c++1z
C++17 ext flags: -std=gnu++1z
-- Configuring done
PGI on Linux:
-- The CXX compiler identification is PGI 18.4.0
-- Check for working CXX compiler: /opt/pgi/linux86-64/18.4/bin/pgc++
-- Check for working CXX compiler:
/opt/pgi/linux86-64/18.4/bin/pgc++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
C++98 std flags: -A
C++98 ext flags: --gnu_extensions
C++11 std flags: --c++11;-A
C++11 ext flags: --c++11;--gnu_extensions
C++14 std flags: --c++14;-A
C++14 ext flags: --c++14;--gnu_extensions
C++17 std flags: --c++17;-A
C++17 ext flags: --c++17;--gnu_extensions
-- Configuring done
And for IBM XL on AIX:
-- The CXX compiler identification is XL 13.1.3
-- Check for working CXX compiler: /usr/bin/xlC
-- Check for working CXX compiler: /usr/bin/xlC -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
C++98 std flags: -qlanglvl=strict98
C++98 ext flags: -qlanglvl=extended
C++11 std flags: -qlanglvl=extended0x
C++11 ext flags: -qlanglvl=extended0x
C++14 std flags:
C++14 ext flags:
C++17 std flags:
C++17 ext flags:
-- Configuring done
-- Generating done
- Chuck
--
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