Should print out compiler errors by default

[wch]

Currently, if there's an error compiling code, you see something like this:

cpp_function('int add(int x) {
  x + 1
}')
#> Error in dyn.load(shared_lib, local = TRUE, now = TRUE) : 
#>   unable to load shared object '/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T//RtmpLTptnM/fileafcc25bcdd37/src/code_1.so':
#>   dlopen(/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T//RtmpLTptnM/fileafcc25bcdd37/src/code_1.so, 6): image not found

But this message isn't helpful.

A useful message is printed with quiet=FALSE. However, it isn't immediately obvious to the user that this option is necessary to get a useful error, and it also includes a lot of other information as well:

cpp_function('int add(int x) {
  x + 1
}', quiet = FALSE)
#> clang++ -mmacosx-version-min=10.13 -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/Users/winston/R/4.0/cpp11/include  -I/usr/local/include   -fPIC  -Wall -g -O2  -g -O0 -Wall -c /private/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T/RtmpLTptnM/fileafcc33aca4da/src/code_2.cpp -o /private/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T/RtmpLTptnM/fileafcc33aca4da/src/code_2.o
#> clang++ -mmacosx-version-min=10.13 -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/Users/winston/R/4.0/cpp11/include  -I/usr/local/include   -fPIC  -Wall -g -O2  -g -O0 -Wall -c /private/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T/RtmpLTptnM/fileafcc33aca4da/src/cpp11.cpp -o /private/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T/RtmpLTptnM/fileafcc33aca4da/src/cpp11.o
#> /private/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T/RtmpLTptnM/fileafcc33aca4da/src/code_2.cpp:6:8: error: expected ';' after expression
#>   x + 1
#>        ^
#>        ;
#> /private/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T/RtmpLTptnM/fileafcc33aca4da/src/code_2.cpp:6:5: warning: expression result unused [-Wunused-value]
#>   x + 1
#>   ~ ^ ~
#> 1 warning and 1 error generated.
#> make: *** [/private/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T/RtmpLTptnM/fileafcc33aca4da/src/code_2.o] Error 1
#> make: *** Waiting for unfinished jobs....
#> Error in dyn.load(shared_lib, local = TRUE, now = TRUE) : 
#>   unable to load shared object '/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T//RtmpLTptnM/fileafcc33aca4da/src/code_2.so':
#>   dlopen(/var/folders/vd/0_g4hj6d7kq_fw5gd_r0ml5w0000gn/T//RtmpLTptnM/fileafcc33aca4da/src/code_2.so, 6): image not found

It would be nice if the default behavior was to just print out errors.

[jimhester]

Agreed, perhaps we could change the default, at least when used interactively.

[jimhester]

Ok this should be much better now