Won't build for iOS gomobile

[birros]

Unable to upgrade to the version v0.3.0 of go-libp2p-connmgr in a gomobile project. The build fails because of an error from the build of this dependency: github.com/elastic/gosigar.

The libproc.h header file seems to be missing in the Xcode iOS SDK.

$ gomobile bind -target ios/arm64 -o BAR.xcframework github.com/FOO/BAR
gomobile: ios/arm64: go build -buildmode=c-archive -o /var/folders/95/316g3tpn3cj_3lfqwgtqwfkr0000gn/T/gomobile-work-1004638070/BAR-ios-arm64.a ./gobind failed: exit status 2
# github.com/elastic/gosigar
/var/folders/95/316g3tpn3cj_3lfqwgtqwfkr0000gn/T/gomobile-work-1004638070/ios/pkg/mod/github.com/elastic/[email protected]/sigar_darwin.go:12:10: fatal error: 'libproc.h' file not found
#include <libproc.h>
         ^~~~~~~~~~~
1 error generated.

Related to #137 and #134

Module	Version
os	macOS 12.1
go-libp2p-connmgr	v0.3.0
go	go1.17.5 darwin/amd64
gomobile	v0.0.0-20211207041440-4e6c2922fdee

[marten-seemann]

iOS gomobile is not one of the platforms we're targeting.
Feel free to go ahead an file an issue with gosigar and bubble up the change once it's fixed there, but the libp2p team won't actively work on a fix for this.

[Stebalien]

@birros note: if upstream doesn't want to take that patch, an alternative is to patch go-watchdog to make the SystemDriven option unavailable on iOS.

[richard-ramos]

@birros note: if upstream doesn't want to take that patch, an alternative is to patch go-watchdog to make the SystemDriven option unavailable on iOS.

I tested this suggestion in status-im/go-watchdog@9800419 and it seems to work fine when using ios.