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Target specific optimization control.

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This allows one to set a semi-colon separated list of regular
expressions in the environment variable PX4_NO_OPTIMIZATION
to control which (cmake generated) targets should be compiled
without optimization.

Suppressing optimization can be necessary for debugging in
a debugger, especially when trying to step through the code
or needing to print variables that otherwise are optimized out.

EXAMPLE

export PX4_NO_OPTIMIZATION="px4;^modules__uORB;^modules__systemlib$"

will result in the following messages during cmake configuration:

[...]
-- Disabling optimization for target 'platforms__posix__px4_layer'
because it matches the regexp 'px4' in env var PX4_NO_OPTIMIZATION
-- Disabling optimization for target 'modules__systemlib' because it
matches the regexp '^modules__systemlib$' in env var PX4_NO_OPTIMIZATION
-- Disabling optimization for target 'modules__uORB' because it matches
the regexp '^modules__uORB' in env var PX4_NO_OPTIMIZATION
-- Disabling optimization for target 'examples__px4_simple_app' because
it matches the regexp 'px4' in env var PX4_NO_OPTIMIZATION
-- Disabling optimization for target 'modules__uORB__uORB_tests' because
it matches the regexp '^modules__uORB' in env var PX4_NO_OPTIMIZATION
-- Disabling optimization for target 'px4' because it matches the regexp
'px4' in env var PX4_NO_OPTIMIZATION

Note that a list of all (currently used) target names can be printed
with the following command line from within the required build directory:

find . -wholename '*/CMakeFiles/*.dir/flags.make' | xargs dirname | xargs basename -a | sort -u | sed -e 's/.dir$//'
This commit is contained in:
Carlo Wood
2016-09-02 01:12:05 +02:00
committed by Beat Küng
parent 541c8a06ca
commit 77d356d275
7 changed files with 108 additions and 20 deletions
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5
CMakeLists.txt
View File

@@ -318,14 +318,15 @@ px4_os_add_flags(
BOARD ${BOARD}
C_FLAGS c_flags
CXX_FLAGS cxx_flags
OPTIMIZATION_FLAGS optimization_flags
EXE_LINKER_FLAGS exe_linker_flags
INCLUDE_DIRS include_dirs
LINK_DIRS link_dirs
DEFINITIONS definitions)
px4_join(OUT CMAKE_EXE_LINKER_FLAGS LIST "${exe_linker_flags}" GLUE " ")
px4_join(OUT CMAKE_C_FLAGS LIST "${c_flags}" GLUE " ")
px4_join(OUT CMAKE_CXX_FLAGS LIST "${cxx_flags}" GLUE " ")
px4_join(OUT CMAKE_C_FLAGS LIST "${c_flags};${optimization_flags}" GLUE " ")
px4_join(OUT CMAKE_CXX_FLAGS LIST "${cxx_flags};${optimization_flags}" GLUE " ")
include_directories(${include_dirs})
#message("INCLUDE_DIRS=${include_dirs}")