Each library in ardupilot is a folder with the source in. That avoids build
failures when there are files in libraries/. That fixes#4099 ("waf doesn't
seem to like TAGS files") and #4093 ("sim_vehicle.py /w waf /w eclipse project
broken on Cygwin").
That problem can be reproduced by just creating a file in libraries/ and trying
to build with waf.
There should be a better way to confirm a path is an ardupilot library. That
can be done later.
This is a hackish way to allow waf running on windows. In some
combinations of the tools the python interpreter seems to be crashing on
windows:
Found 180 MAVLink message types in 2 XML files
Generating C implementation in directory /tmp/ArduPlane.build/libraries/GCS_MAVLink/include/mavlink/v1.0/ardupilotmega
Generating C implementation in directory /tmp/ArduPlane.build/libraries/GCS_MAVLink/include/mavlink/v1.0/common
Copying fixed headers
last line in mavgen.py
Aborted (core dumped)
michael@WIN-3NBOUTHN4TN /cygdrive/c/Users/michael/Desktop/DIYDrones/ardupilot/ArduPlane
$ echo $?
134
Here we check the return code to be greater than 128 since that means the
interpreter received a signal. In this case we clear the return code.
Fix warnings like this:
<command-line>:0:21: warning: "APM_BUILD_DataFlash_test" is not defined [-Wundef]
/home/lucas/p/dronecode/ardupilot/libraries/AP_Vehicle/AP_Vehicle_Type.h:36:41: note: in expansion of macro ‘APM_BUILD_DIRECTORY’
#define APM_BUILD_TYPE(type) ((type) == APM_BUILD_DIRECTORY)
^
These happen because we are trying to set APM_BUILD_DIRECTORY to undefined
values. We should rather default to the APM_BUILD_DIRECTORY ==
APM_BUILD_UNKNOWN
check for the presence of libiio to enable the compilation of
the bebop rangefinder that needs it.
If the build remains static, there needs to be a rootfs that contains
the libiio.a file because it is not included in the debian package.
A solution can be to compile libiio and copy libiio.a in /usr/lib[/arch]
Otherwise it fails to link:
[335/335] Linking build/sitl/bin/arducopter-quad.exe
ArduCopter/libArduCopter_libs.a(SIM_Aircraft.cpp.4.o):SIM_Aircraft.cpp:(.text$_ZN4SITL8AircraftC2EPKcS2_+0x230): undefined reference to `_imp__timeGetTime@0'
ArduCopter/libArduCopter_libs.a(SIM_Aircraft.cpp.4.o):SIM_Aircraft.cpp:(.text$_ZN4SITL8Aircraft16setup_frame_timeEff+0x9f): undefined reference to `_imp__timeGetTime@0'
ArduCopter/libArduCopter_libs.a(SIM_Aircraft.cpp.4.o):SIM_Aircraft.cpp:(.text$_ZN4SITL8Aircraft16setup_frame_timeEff+0x125): undefined reference to `_imp__timeGetTime@0'
ArduCopter/libArduCopter_libs.a(SIM_Aircraft.cpp.4.o):SIM_Aircraft.cpp:(.text$_ZN4SITL8Aircraft15sync_frame_timeEv+0x21): undefined reference to `_imp__timeGetTime@0'
ArduCopter/libArduCopter_libs.a(SIM_Aircraft.cpp.4.o):SIM_Aircraft.cpp:(.text$_ZN4SITL8Aircraft15sync_frame_timeEv+0x152): undefined reference to `_imp__timeGetTime@0'
ArduCopter/libArduCopter_libs.a(SIM_Aircraft.cpp.4.o):SIM_Aircraft.cpp:(.text$_ZNK4SITL8Aircraft16get_wall_time_usEv+0xe): more undefined references to `_imp__timeGetTime@0' follow
collect2: error: ld returned 1 exit status
Before:
Checking for code snippet : yes
Checking for code snippet : yes
Checking for code snippet : yes
Checking for code snippet : yes
Checking for code snippet : no
Checking for code snippet : no
After:
Checking for HAVE_CMATH_ISFINITE : yes
Checking for HAVE_CMATH_ISINF : yes
Checking for HAVE_CMATH_ISNAN : yes
Checking for NEED_CMATH_ISFINITE_STD_NAMESPACE : yes
Checking for NEED_CMATH_ISINF_STD_NAMESPACE : no
Checking for NEED_CMATH_ISNAN_STD_NAMESPACE : no
The usual name for this header is config.h, but that's already used by
vehicles. Using uppercase could give the impression this is a
file to be modified, but it's not. Use lowercase instead.
Files that are not really part of the ROMFS in the folder might cause problems.
One problem that motivated this patch was caused because the make-based build
system copies the bootloader to the ROMFS in the source tree (mk/PX4/ROMFS)
instead of the build tree. That potentially could cause race condition between
the tasks created by 'px4_romfs_static_files' and 'px4_romfs_bootloader'.
Also, now we have only one task generator for static files.
That way we don't force other programs to be built on a directory of their
program group name. The directory name defaults to the program group.
We are separating those two concepts because of the upcoming support for
multiple groups for a program.
The find_realexec_path function was used for finding the toolchain path mostly
because of two reasons:
1) We couldn't really use CXX or CC variables because the user could set those
from the OS's environment and Waf wouldn't look for the executable file in
that case.
2) Our CI configuration sets up symlinks for ccache and find_realexec_path
works around that issue.
The bad side about using find_realexec_path() is that, besides working aroung
symlinks, it does the same thing that is done by Waf. This patch removes the
dependency for such a function by addressing each of the reasons above stated:
1) We create a local copy of os.environ and, if there's a variable with the
same name we are using, we remove it from the local copy.
2) As done before, we are looking for the cross ar program instead of gcc
program, since that is not used for ccache symlinks.
This is a better approach than checking command line options
--check-cxx-compiler and --check-c-compiler. Those values expect a list of
compilers to try instead of the compiler to use.
The benefits of this approach are:
- Allowing correct use of options --check-cxx-compiler and --check-c-compiler.
- Allowing user to pass CXX and CC environment variables, which is a common
way of selecting the compiler.
- Configuration is done *and committed* only for the specific compiler.
This is a better approach than checking command line options
--check-cxx-compiler and --check-c-compiler. Those values expect a list of
compilers to try instead of the compiler to use.
The benefits of this approach are:
- Allowing correct use of options --check-cxx-compiler and --check-c-compiler.
- Allowing user to pass CXX and CC environment variables, which is a common
way of selecting the compiler.
- Configuration is done *and committed* only for the specific compiler.
It makes more sense the toolchain Waf tool to be responsible of loading the
compilers. Furthermore, that allows toolchain tool to have control on doing
configuration before and after loading compiler tools.
- Use early return and reduce one indentation level.
- Set AR for both GNU compilers and clang just once and reduce redundancy.
- Reduce indentation level for clang-specific setup. There's no need to nest it
inside check if compilers are GNU or clang.
Lucas De Marchi
Andrew Tridgell
Gustavo Jose de Sousa
Francisco Ferreira
Julien Beraud
Ricardo de Almeida Gonzaga