Undefined references on install

[Kukulkano]

Hi. I follow the documentation and run

go get github.com/webui-dev/go-webui/v2@latest

Sadly, it fails:

# github.com/webui-dev/go-webui/v2
../../../go/pkg/mod/github.com/webui-dev/go-webui/v2@v2.4.0/webui-linux-gcc-x64/libwebui-2-static.a(civetweb.o): In function `set_non_blocking_mode':
civetweb.c:(.text+0x4ff): undefined reference to `fcntl64'
civetweb.c:(.text+0x51b): undefined reference to `fcntl64'
../../../go/pkg/mod/github.com/webui-dev/go-webui/v2@v2.4.0/webui-linux-gcc-x64/libwebui-2-static.a(civetweb.o): In function `fclose_on_exec':
civetweb.c:(.text+0x3fe4): undefined reference to `fcntl64'
../../../go/pkg/mod/github.com/webui-dev/go-webui/v2@v2.4.0/webui-linux-gcc-x64/libwebui-2-static.a(civetweb.o): In function `set_close_on_exec.constprop.0':
civetweb.c:(.text+0x453e): undefined reference to `fcntl64'
../../../go/pkg/mod/github.com/webui-dev/go-webui/v2@v2.4.0/webui-linux-gcc-x64/libwebui-2-static.a(civetweb.o): In function `close_connection':
civetweb.c:(.text+0xae12): undefined reference to `fcntl64'
../../../go/pkg/mod/github.com/webui-dev/go-webui/v2@v2.4.0/webui-linux-gcc-x64/libwebui-2-static.a(civetweb.o):civetweb.c:(.text+0xae2a): more undefined references to `fcntl64' follow
collect2: error: ld returned 1 exit status

Any idea what is wrong? How can I fix this?

I'm on Linux (x86-64) using go1.16.2 linux/amd64.

[hassandraga]

I just test it this morning in Windows and it works fine:

> go get github.com/webui-dev/go-webui/v2@latest
go: downloading github.com/webui-dev/go-webui/v2 v2.4.0
go: upgraded github.com/webui-dev/go-webui/v2 v2.3.2 => v2.4.0

> go build minimal.go

> minimal.exe

I will re-test it in Linux later today.

[hassandraga]

According to this issue, they make a hack as a workaround. In general, WebUI uses Civetweb, and Civetweb includes <fcntl.h>, which may not be compatible with your GLibc version.

What is the version of GLIBC installed on your machine? You can use ldd --version command or a similar one.

[Kukulkano]

> ldd --version
ldd (Ubuntu GLIBC 2.27-3ubuntu1.6) 2.27

I'm on KDE NEON 5.19 (basically Ubuntu 20.04 LTS) and just ran all updates (apt get update, apt get upgrade).

[hassandraga]

in glibc 2.28+ and _FILE_OFFSET_BITS=64 fcntl is #define'd to fcntl64
Thus headers say fcntl64 exists, but libc.so.6 (the old one) disagrees

I guess we need to apply the same hack they did. I will investigate.

[hassandraga]

I just test it using Ubuntu 22.04.2 LTS with ldd (Ubuntu GLIBC 2.35-0ubuntu3.1) 2.35. it works fine.

[ttytm]

Most part of the wrapper was re-written for the upcoming release. Can you re-check if the issue is solved for you @Kukulkano ?
The go get command changed to: go get github.com/webui-dev/go-webui@latest

[hassandraga]

Perhaps we should change #cgo windows to #cgo windows,amd64 so Go builder knows that ARM lib does not exist.
@ttytm

[ttytm]

Yes, sounds good.

I'll look into linux arm the next days as well 👍 . If things work we can add it to webuis github releases.

[ttytm]

Perhaps we should change #cgo windows to #cgo windows,amd64 so Go builder knows that ARM lib does not exist. @ttytm

go-webui/v2/cgo.go

Line 6 in 8333e2d

#cgo windows,amd64 LDFLAGS: -Lwebui -lwebui-2-static -lws2_32

Its in there since October.