Added C++ support for GCC

[beeeeep]

1. Minor edits in the sw/device/ files to avoid any errors caused due differences in C and C++
2. Changes in CMakeLists.txt to include C++ projects and .cpp files. Additionally some compile flags for C++ were added
3. Addition of some c++ oriented syscall and heap functions in the heap.cpp and syscalls_cpp.cpp files
4. In example_cpp, changed main.c to main.cpp

[JoseCalero]

thanks for the porting! Generally, it is OK. Let's try to fix these initial comments, then we need to check why the building is failing (see the CI) --> i know that the changes of the CMakeLists.txt are maybe failing at some point --> could you check that all apps are compiling? (see the test_all.sh script under the util folder)

[JoseCalero]

thanks for the porting! Generally, it is OK. Let's try to fix these initial comments, then we need to check why the building is failing (see the CI) --> i know that the changes of the CMakeLists.txt are maybe failing at some point --> could you check that all apps are compiling? (see the test_all.sh script under the util folder)

@beeeeep can you check the comments i left? otherwise, i will close the PR, replicate in another PR and try to merge a version of it (maybe without too many code compilation optimizations)

[beeeeep]

Sorry for the delay, but I was away these days. have done most of the changes required. Now I just have to figure out why some apps do not compile, it has to do with CMAKE. I'll get to it from Monday.

[beeeeep]

Hello, I've finished with the changes and brought the fork up to date as well. All the applications have been tested in the sim with test_all.sh

[JuanSapriza]

From what I understand from the title, the idea is to be able to compile applications in C++ with gcc. But what is going to happen with clang or the ohw-gcc?

CMake Error at CMakeLists.txt:381 (add_executable):
  Cannot find source file:

    /__w/x-heep/x-heep/sw/applications/example_cpp/main.c

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
  .hpp .hxx .in .txx

CMake Error at CMakeLists.txt:381 (add_executable):
  No SOURCES given to target: main.elf

CMake Generate step failed.  Build files cannot be regenerated correctly.
-- Configuring done
make[1]: *** [cmake/targets.mak:26: build/Makefile] Error 1
make[1]: Leaving directory '/__w/x-heep/x-heep/sw'
make: *** [Makefile:149: app] Error 2
================================================================================
Failure building example_cpp using Clang
================================================================================

[beeeeep]

From what I understand from the title, the idea is to be able to compile applications in C++ with gcc. But what is going to happen with clang or the ohw-gcc?

CMake Error at CMakeLists.txt:381 (add_executable):
  Cannot find source file:

    /__w/x-heep/x-heep/sw/applications/example_cpp/main.c

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
  .hpp .hxx .in .txx

CMake Error at CMakeLists.txt:381 (add_executable):
  No SOURCES given to target: main.elf

CMake Generate step failed.  Build files cannot be regenerated correctly.
-- Configuring done
make[1]: *** [cmake/targets.mak:26: build/Makefile] Error 1
make[1]: Leaving directory '/__w/x-heep/x-heep/sw'
make: *** [Makefile:149: app] Error 2
================================================================================
Failure building example_cpp using Clang
================================================================================

I thought that the tests were separate for GCC and Clang, I am working on a fix for Clang at the moment.

[beeeeep]

Hello, unfortunately we do not have time to work with the clang integration at the moment, we might be able to pick it up again in one month or so. One solution would be remove the exampe_cpp test for clang, or close the pull request and make another one in the future.

[JuanSapriza]

Hello! I opened a PR with @beeeeep fixing the CI to exclude this cpp file. It also supports multi-source projects now. @davideschiavone

Maybe a quick look from @JoseCalero once it's merged? (it should appear automatically in this PR once merged on beeeeep's)

[JoseCalero]

I will do a final check and will merge today

[JoseCalero]

Everything OK, @JuanSapriza can you test the spi apps in the FPGA? After that we can merge

[JuanSapriza]

example_sdk_spi_flash - :ballot_box_with_check: example_spi_read - :ballot_box_withcheck: (in the test_apps.py blacklist)_

example_spi_host_dma_power_gate- :x: Stuck after Launched, might make sense tho _(in the test_apps.py blacklist)_

example_spi_write - :x: Wrong results on every address _(in the test_apps.py blacklist)_ :warning: BUT WORKS ON MAIN

@JoseCalero

[davideschiavone]

thanks a lot @beeeeep :) appreciated a lot