I've been trying to add an icon to an executable generated by go build. Internally, this executable uses webview/webview_go.
I've used windres to generate the .syso file from the following .rc file
#include <windows.h>
100 ICON "favicon.ico"
(comand used to generate: C:\mingw64\bin\windres.exe -i .\windress-res\app.rc -O coff -o cmd/app.syso)
After, I build the executable
$env:CC = "C:\mingw64\bin\gcc.exe";
$env:CXX = "C:\mingw64\bin\g++.exe";
go build --ldflags "-linkmode=external -H=windowsgui -s -w" cmd/app.go
The resulting executable has no icon.
Then, I read that I have to add a flag to --ldflags: -linkmode external, but this generates multiple errors along the lines of github.com/webview/webview_go(.text): relocation target webview_dispatch not defined.
From my understanding, I cannot use the internal go linker since the built exe uses CGO.
How can I embed the icon into the executable then ? I've been struggling to find an answer that works.
I'm open to any solution that will get an icon in my file, as long as it's scriptable.
Aaaand asking the question on stackoverflow is great because I generally figure out the answer on my own not long after. No exception this time.
By using the -extldflags flag of the go linker, I was able to add the icon using the g++ linker.
This gives the following command (in --ldflags, which passes the go linker flags from the build command).
(Note the change to single quotes for the --ldflags parameter, because we need double quotes inside.)
$env:CC = "C:\mingw64\bin\gcc.exe";
$env:CXX = "C:\mingw64\bin\g++.exe";
go build --ldflags '-linkmode=external -H=windowsgui -s -w -extldflags "cmd/app.syso"' cmd/app.go