Select the suitable ARM compiler of de10-nano board for dcurl + libtuv

[marktwtn]

The structure of de10-nano board would be recognized by dcurl or libtuv as arm-linux.

The default arm-linux compiler of building libtuv is arm-linux-gnueabihf-gcc.
However, the de10-nano environment set up by @ajblane only contains the compiler of arm-linux-gnueabi-gcc.

To build libtuv successfully on de10-nano board, the current workaround includes:

• Set the compiler from arm-linux-gnueabihf-gcc to arm-linux-gnueabi-gcc.
• Remove the compiler flag -mfloat-abi=hard since we do not have the header file gnu/stubs-hard.h and we use the compiler without hf(hard floating point).

In my opinion, the hardware floating point calculation is not really necessary in dcurl + libtuv.

There are two possible ways to make dcurl + libtuv work on de10-nano board:

1. The environment of de10-nano should contain the compiler arm-linux-gnueabihf-gcc and the corresponding header files.
2. Modify the libtuv compiler and flags as mentioned before.

[ajblane]

Using arm-linux-gnueabihf-gcc can work for crossing compiling as refers to Exploring the HPS and FPGA onboard the Terasic DE10-Nano.

For modifying the libtuv compiler and flags, It can detect if arm-linux-gnueabihf-gcc exists. If arm-linux-gnueabihf-gcc does not exist, it then uses arm-linux-gnueabi-gcc. What do you think?

[marktwtn]

If arm-linux-gnueabihf-gcc does not exist, it then uses arm-linux-gnueabi-gcc. What do you think?

It sounds workable.
The find_program() command of cmake can be used to help us.

[marktwtn]

To @ajblane
The libtuv branch arm-linux-detect-compiler can be used to detect the compiler.
Please use the branch in libtuv submodule, compile it on the de10-nano board and report the result.

[ajblane]

There is an error:

make -C deps/libtuv TUV_BUILD_TYPE=release TUV_CREATE_PIC_LIB=yes TUV_PLATFORM==
make[1]: Entering directory '/root/mark/dcurl/deps/libtuv'                      
make[1]: Warning: File 'Makefile' has modification time 1557708913 s in the fute
mkdir -p ./build/arm-linux/release/cmake                                        
cmake -B./build/arm-linux/release/cmake -H./ -DCMAKE_TOOLCHAIN_FILE=./cmake/con=
-- The C compiler identification is GNU 6.3.0                                   
-- Check for working C compiler: /usr/bin/arm-linux-gnueabi-gcc                 
-- Check for working C compiler: /usr/bin/arm-linux-gnueabi-gcc -- works        
-- Detecting C compiler ABI info                                                
-- Detecting C compiler ABI info - done                                         
-- Detecting C compile features                                                 
-- Detecting C compile features - done                                          
CMake Error at cmake/option/option_arm-linux.cmake:21 (if):                     
  if given arguments:                                                           
                                                                                
    "STREQUAL" "rpi2"                                                           
                                                                                
  Unknown arguments specified                                                   
Call Stack (most recent call first):                                            
  cmake/options.cmake:40 (include)                                              
  CMakeLists.txt:33 (include)                                                   
                                                                                
                                                                                
-- Configuring incomplete, errors occurred!                                     
See also "/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake/CMakeFiles.
Makefile:63: recipe for target 'all' failed       
``

[marktwtn]

@ajblane , I can not get the full command you used.
Did you specify the BOARD?

[ajblane]

I specify the BUILD_BOARD. I try to specify the BOARD.

[ajblane]

Success by using $ make BUILD_REMOTE=1 BUILD_BOARD=de10nano BUILD_FPGA_ACCEL=1

  CC    build/dcurl.o                                                                                                              
  CC    build/implcontext.o                                                                                                        
  CC    build/common.o                                                                                                             
  CC    build/pow_fpga_accel.o                                                                                                     
  CC    build/remote_common.o                                                                                                      
  CC    build/remote_interface.o                                                                                                   
make -C deps/libtuv TUV_BUILD_TYPE=release TUV_CREATE_PIC_LIB=yes TUV_PLATFORM=arm-linux TUV_BOARD=de10nano                        
make[1]: Entering directory '/root/mark/dcurl/deps/libtuv'                                                                         
make[1]: Warning: File 'Makefile' has modification time 1557708715 s in the future                                                 
mkdir -p ./build/arm-linux/release/cmake                                                                                           
cmake -B./build/arm-linux/release/cmake -H./ -DCMAKE_TOOLCHAIN_FILE=./cmake/config/config_arm-linux.cmake -DCMAKE_BUILD_TYPE=releao
-- Build Type: [release]                                                                                                           
-- Configuring done                                                                                                                
-- Generating done                                                                                                                 
-- Build files have been written to: /root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake                                    
make -C ./build/arm-linux/release/cmake                                                                                            
make[2]: Entering directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                           
-- Build Type: [release]                                                                                                           
-- Configuring done                                                                                                                
-- Generating done                                                                                                                 
-- Build files have been written to: /root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake                                    
make[3]: Entering directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                           
make[4]: Entering directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                           
Scanning dependencies of target tuv                                                                                                
make[4]: Leaving directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                            
make[4]: Entering directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                           
make[4]: Warning: File '../../../../src/fs-poll.c' has modification time 1557708713 s in the future                                
[  2%] Building C object CMakeFiles/tuv.dir/src/fs-poll.c.o                                                                        
[  4%] Building C object CMakeFiles/tuv.dir/src/inet.c.o                                                                           
[  6%] Building C object CMakeFiles/tuv.dir/src/threadpool.c.o                                                                     
[  8%] Building C object CMakeFiles/tuv.dir/src/uv-common.c.o                                                                      
[ 10%] Building C object CMakeFiles/tuv.dir/src/tuv_debuglog.c.o                                                                   
[ 13%] Building C object CMakeFiles/tuv.dir/src/unix/async.c.o                                                                     
[ 15%] Building C object CMakeFiles/tuv.dir/src/unix/core.c.o                                                                      
[ 17%] Building C object CMakeFiles/tuv.dir/src/unix/fs.c.o                                                                        
[ 19%] Building C object CMakeFiles/tuv.dir/src/unix/getaddrinfo.c.o                                                               
[ 21%] Building C object CMakeFiles/tuv.dir/src/unix/loop.c.o                                                                      
[ 23%] Building C object CMakeFiles/tuv.dir/src/unix/loop-watcher.c.o                                                              
[ 26%] Building C object CMakeFiles/tuv.dir/src/unix/poll.c.o                                                                      
[ 28%] Building C object CMakeFiles/tuv.dir/src/unix/process.c.o                                                                   
[ 30%] Building C object CMakeFiles/tuv.dir/src/unix/stream.c.o                                                                    
[ 32%] Building C object CMakeFiles/tuv.dir/src/unix/tcp.c.o                                                                       
[ 34%] Building C object CMakeFiles/tuv.dir/src/unix/thread.c.o                                                                    
[ 36%] Building C object CMakeFiles/tuv.dir/src/unix/timer.c.o                                                                     
[ 39%] Building C object CMakeFiles/tuv.dir/src/unix/udp.c.o                                                                       
[ 41%] Building C object CMakeFiles/tuv.dir/src/unix/pipe.c.o                                                                      
[ 43%] Building C object CMakeFiles/tuv.dir/src/unix/signal.c.o                                                                    
[ 45%] Building C object CMakeFiles/tuv.dir/src/unix/linux-core.c.o                                                                
[ 47%] Building C object CMakeFiles/tuv.dir/src/unix/linux-syscalls.c.o                                                            
[ 50%] Linking C static library ../lib/libtuv.a                                                                                    
make[4]: warning:  Clock skew detected.  Your build may be incomplete.                                                             
make[4]: Leaving directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                            
[ 50%] Built target tuv                                                                                                            
make[4]: Entering directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                           
Scanning dependencies of target tuv_pic                                                                                            
make[4]: Leaving directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                            
make[4]: Entering directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                           
make[4]: Warning: File '../../../../src/fs-poll.c' has modification time 1557708686 s in the future                                
[ 52%] Building C object CMakeFiles/tuv_pic.dir/src/fs-poll.c.o                                                                    
[ 54%] Building C object CMakeFiles/tuv_pic.dir/src/inet.c.o                                                                       
[ 56%] Building C object CMakeFiles/tuv_pic.dir/src/threadpool.c.o                                                                 
[ 58%] Building C object CMakeFiles/tuv_pic.dir/src/uv-common.c.o                                                                  
[ 60%] Building C object CMakeFiles/tuv_pic.dir/src/tuv_debuglog.c.o                                                               
[ 63%] Building C object CMakeFiles/tuv_pic.dir/src/unix/async.c.o                                                                 
[ 65%] Building C object CMakeFiles/tuv_pic.dir/src/unix/core.c.o                                                                  
[ 67%] Building C object CMakeFiles/tuv_pic.dir/src/unix/fs.c.o                                                                    
[ 69%] Building C object CMakeFiles/tuv_pic.dir/src/unix/getaddrinfo.c.o                                                           
[ 71%] Building C object CMakeFiles/tuv_pic.dir/src/unix/loop.c.o                                                                  
[ 73%] Building C object CMakeFiles/tuv_pic.dir/src/unix/loop-watcher.c.o                                                          
[ 76%] Building C object CMakeFiles/tuv_pic.dir/src/unix/poll.c.o                                                                  
[ 78%] Building C object CMakeFiles/tuv_pic.dir/src/unix/process.c.o                                                               
[ 80%] Building C object CMakeFiles/tuv_pic.dir/src/unix/stream.c.o                                                                
[ 82%] Building C object CMakeFiles/tuv_pic.dir/src/unix/tcp.c.o                                                                   
[ 84%] Building C object CMakeFiles/tuv_pic.dir/src/unix/thread.c.o                                                                
[ 86%] Building C object CMakeFiles/tuv_pic.dir/src/unix/timer.c.o                                                                 
[ 89%] Building C object CMakeFiles/tuv_pic.dir/src/unix/udp.c.o                                                                   
[ 91%] Building C object CMakeFiles/tuv_pic.dir/src/unix/pipe.c.o                                                                  
[ 93%] Building C object CMakeFiles/tuv_pic.dir/src/unix/signal.c.o                                                                
[ 95%] Building C object CMakeFiles/tuv_pic.dir/src/unix/linux-core.c.o                                                            
[ 97%] Building C object CMakeFiles/tuv_pic.dir/src/unix/linux-syscalls.c.o                                                        
[100%] Linking C static library ../lib/libtuv.o                                                                                    
make[4]: warning:  Clock skew detected.  Your build may be incomplete.                                                             
make[4]: Leaving directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                            
[100%] Built target tuv_pic                                                                                                        
make[3]: Leaving directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                            
make[2]: Leaving directory '/root/mark/dcurl/deps/libtuv/build/arm-linux/release/cmake'                                            
make[1]: warning:  Clock skew detected.  Your build may be incomplete.                                                             
make[1]: Leaving directory '/root/mark/dcurl/deps/libtuv'                                                                          
  CC    build/test-trinary.o                                                                                                       
...