warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]

[andig]

On

Darwin MAC-A25058-FVFF634UQ05N 24.3.0 Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:06 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T8103 arm64

❯ go install github.com/ofabry/go-callvis@master
go: downloading github.com/ofabry/go-callvis v0.7.2-0.20250102153122-fb6b442a4144
go: downloading github.com/goccy/go-graphviz v0.1.2
go: downloading golang.org/x/image v0.18.0
# github.com/goccy/go-graphviz/internal/ccall
In file included from common.c:5:
./common/emit.c:165:35: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]

[ondrej-fabry]

Hello, thanks for reporting.
It's a warning, it should be ok. Are you experiencing some issues with rendering?

[andig]

Just getting started- no actual issue.

[akram-suplari]

I am having the same issue (uname Darwin 23.6.0 Darwin Kernel Version 23.6.0: Wed Jul 31 20:50:00 PDT 2024; root:xnu-10063.141.1.700.5~1/RELEASE_ARM64_T6031 arm64 arm) but the installation is not performed so I cannot run it.

I also tried cloning and doing make install and same issue shows up and no binary is installed.

make test does not work either:

make test                                                                                                                                                                      
go test -tags "" -ldflags "-X main.commit=v0.7.1-4-gfb6b442 -w -s" -trimpath -short -race ./...
# github.com/goccy/go-graphviz/internal/ccall
In file included from common.c:5:
./common/emit.c:165:35: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2540:24: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2596:35: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2602:35: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2612:31: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2623:31: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2628:31: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2641:28: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2650:33: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2659:32: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
./common/emit.c:2668:32: warning: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Wsingle-bit-bitfield-constant-conversion]
?   	github.com/ofabry/go-callvis	[no test files]
?   	github.com/ofabry/go-callvis/examples/main/mypkg	[no test files]
?   	github.com/ofabry/go-callvis/examples/main	[no test files]

Anything else I can provide to debug this issue?

[ondrej-fabry]

@akram-suplari hey, try compiling without CGO enabled

[akram-suplari]

Yes, that worked!

Thanks

For reference:

build:  ## Build go-callvis
	CGO_ENABLED=0 go build -v -tags $(GO_BUILD_TAGS) -ldflags "$(GO_LDFLAGS)" $(GO_BUILD_ARGS)