How to run OpenOCD GDB server from Visual studio Code - gdb

Question

I'm developing applications on a Cortex-M3 microcontroller (STM32 family). I'm trying to use Visual Studio Code as the debugger interface, with a ST-Link v2 JTAG probe. I managed to configure OpenOCD to talk to my device, and VSCode to run a local GDB and connect to OpenOCD.
Now I'd like to have VSCode start OpenOCD at the same time as GDB when I start debugging. I have the following launch.json:
{
"version": "0.2.0",
"configurations": [
{
"name": "(gdb) Pipe Launch",
"type": "cppdbg",
"request": "launch",
"program": "${workspaceFolder}/path/to/program.elf",
"stopAtEntry": false,
"cwd": "${workspaceFolder}/gcc-arm-none-eabi",
"environment": [],
"externalConsole": true,
"pipeTransport": {
"pipeProgram": "X:\\path\\to\\openocd-0.10.0\\bin-x64\\openocd.exe",
"pipeArgs": ["-f", "vscode.ocd"],
"pipeCwd": "${workspaceFolder}"
},
"MIMode": "gdb"
},
{
"name": "(gdb) Attach",
"type": "cppdbg",
"request": "launch",
"cwd": "${workspaceFolder}/gcc-arm-none-eabi",
"program": "${workspaceFolder}/path/to/program.elf",
"MIMode": "gdb",
"targetArchitecture": "arm",
"miDebuggerPath": "X:\\path\\to\\gcc-arm-none-eabi-4_8-2014q2-20140609-win32\\bin\\arm-none-eabi-gdb.exe",
"miDebuggerServerAddress": "127.0.0.1:3333"
}
]
}
And my vscode.ocd file is as follow:
source [find interface/stlink-v2.cfg]
transport select "hla_swd"
source stm32l1.cfg
stm32l1.cpu configure -event gdb-attach halt
stm32l1.cpu configure -event gdb-detach resume
gdb_port pipe
log_output openocd.log
When I start OpenOCD manually (without "gdb_port pipe") and then run the configuration "(gdb) Attach", all is fine.
But when I run the "(gdb) Pipe Launch" configuration, VSCode starts openocd.exe, and then nothing happens. When I kill the openocd.exe process, I get a popup in VSCode which says "Unable to start debugging. Unable to establish a connection to GDB. The following message was written to stderr:" followed by some OpenOCD stderr.
I can also run GDB on its own in the command line with the following .gdbinit just fine:
target remote | openocd -f path/tovscode.ocd
sym path/to/program.elf
So my question is is there a way to have VSCode talk to OpenOCD's GDB server directly? Otherwise if I need to use some local arm-none-eabi-gdb.exe file, how can I configure VSCode to have it tell GDB to use a pipe ("target remote | something") remote?