verilator generated code is unix based not for windows

[Kreijstal]

Description / Steps to reproduce the issue

There is a problem with the code generated by verilator that it can not use certain unix constructs,

1. install verilator:p, rust:p, python-pip:p
2. do

   
   # Create a root directory to keep all the different parts of the project together. We will refer to this directory as $WORKSPACE from now on.
   mdkir test
   cd test
   export WORKSPACE=$(pwd)

All the following commands will be run from this directory unless otherwise stated.

Install FuseSoC

pip install fusesoc

Add the FuseSoC standard library

fusesoc library add fusesoc_cores https://github.com/fusesoc/fusesoc-cores

The FuseSoC standard library already contains a version of SERV, but if we want to make changes to SERV, run the bundled example or use the Zephyr support, it is better to add SERV as a separate library into the workspace

fusesoc library add serv https://github.com/olofk/serv

The SERV repo will now be available in $WORKSPACE/fusesoc_libraries/serv. We will refer to that directory as $SERV.

export SERV=$WORKSPACE/fusesoc_libraries/serv

Install the latest version of Verilator

(Optional) To support RISC-V M-extension extension, Multiplication and Division unit (MDU) can be added included into the SERV as a separate library.

fusesoc library add mdu https://github.com/zeeshanrafique23/mdu

MDU will be available in $WORKSPACE/fusesoc_libraries/mdu

We are now ready to do our first exercises with SERV.

If everything worked, the output should look like

INFO: Preparing ::serv:1.3.0

INFO: Setting up project

INFO: Building simulation model

INFO: Running

After performing all the steps that are mentioned above, the directory structure from the $WORKSPACE should look like this:

.

$WORKSPACE

|

├── build

│ └── ...

├── fusesoc.conf

└── fusesoc_libraries

├── fusesoc_cores

│ └── ...

├── mdu

│ └── ...

└── serv

└── ...

Running pre-built test software

Build and run the single threaded zephyr hello world example with verilator (should be stopped with Ctrl-C):

fusesoc run --target=verilator_tb servant --uart_baudrate=57600 --firmware=$SERV/sw/zephyr_hello.hex

### Expected behavior

You get hello world

### Actual behavior

you get 

verilator -f servant_1.3.0.vc

• V e r i l a t i o n R e p o r t: Verilator 5.026 2024-06-15 rev UNKNOWN.REV
• Verilator: Built from 1.836 MB sources in 28 modules, into 0.437 MB in 21 C++ files needing 0.000 MB
• Verilator: Walltime 0.073 s (elab=0.000, cvt=0.016, bld=0.000); cpu 0.000 s on 1 threads; alloced 17.508 MB make -f Vservant_sim.mk make[1]: Entering directory '/home/SYSTEM/to/build/servant_1.3.0/verilator_tb' g++ -I. -MMD -IC:/rtools43/mingw64/share/verilator/include -IC:/rtools43/mingw64/share/verilator/include/vltstd -DVM_COVERAGE=0 -DVM_SC=0 -DVM_TRACE=1 -DVM_TRACE_FST=0 -DVM_TRACE_VCD=1 -faligned-new -fcf-protection=none -Wno-bool-operation -Wno-shadow -Wno-sign-compare -Wno-tautological-compare -Wno-uninitialized -Wno-unused-but-set-parameter -Wno-unused-but-set-variable -Wno-unused-parameter -Wno-unused-variable -Os -c -o servant_tb.o src/servant_1.3.0/bench/servant_tb.cpp In file included from ./Vservant_sim.h:12, from src/servant_1.3.0/bench/servant_tb.cpp:6: C:/rtools43/mingw64/share/verilator/include/vltstd/svdpi.h:143:22: warning: 'dllimport' attribute ignored [-Wattributes] 143 | XXTERN typedef void svScope; | ^~~ C:/rtools43/mingw64/share/verilator/include/vltstd/svdpi.h:146:22: warning: 'dllimport' attribute ignored [-Wattributes] 146 | XXTERN typedef void svOpenArrayHandle; | ^~~~~ src/servant_1.3.0/bench/servant_tb.cpp: In function 'int main(int, char, char)': src/servant_1.3.0/bench/servant_tb.cpp:119:58: error: 'S_IRWXU' was not declared in this scope 119 | tf = open("trace.bin", O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU); | ^~~ src/servant_1.3.0/bench/servant_tb.cpp:137:58: error: 'S_IRWXU' was not declared in this scope 137 | cps_file = open("cps", O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU); | ^~~ src/servant_1.3.0/bench/servant_tb.cpp:169:9: error: 'dprintf' was not declared in this scope; did you mean 'wprintf'? 169 | dprintf(cps_file,"%d\n", (cur_cycle-last_cycle)/2); | ^~~ | wprintf make[1]: [Vservant_sim.mk:61: servant_tb.o] Error 1 make[1]: Leaving directory '/home/SYSTEM/to/build/servant_1.3.0/verilator_tb' make: [Makefile:11: Vservant_sim] Error 2 ERROR: Failed to build ::servant:1.3.0 : '['make']' exited with an error: 2

### Verification

- [X] I have verified that my MSYS2 is up-to-date before submitting the report (see https://www.msys2.org/docs/updating/)

### Windows Version

MINGW64_NT-10.0-19045

### MINGW environments affected

- [X] MINGW64
- [ ] MINGW32
- [ ] UCRT64
- [ ] CLANG64
- [ ] CLANG32
- [ ] CLANGARM64

### Are you willing to submit a PR?

_No response_

[Kreijstal]

I made a mistake, the testbench itself is the one that makes such assumptions, not verilator