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cmd/compile: Adding -gcflags "all=-N -l" does not add debugging information. #64082

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aimuz opened this issue Nov 12, 2023 · 5 comments
Closed

cmd/compile: Adding -gcflags "all=-N -l" does not add debugging information. #64082

aimuz opened this issue Nov 12, 2023 · 5 comments
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compiler/runtime Issues related to the Go compiler and/or runtime.

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@aimuz
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aimuz commented Nov 12, 2023 •
edited

What version of Go are you using (go version)?

$ go version
go version devel go1.22-f7b4f02ba0 Fri Aug 4 15:41:19 2023 +0000 darwin/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/Users/aimuz/Library/Caches/go-build'
GOENV='/Users/aimuz/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=' -mod=mod'
GOHOSTARCH='amd64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/aimuz/go/pkg/mod'
GONOPROXY='gitee.com/wisecloud,gitee.com/wisecloud-archive'
GONOSUMDB='gitee.com/wisecloud,gitee.com/wisecloud-archive'
GOOS='darwin'
GOPATH='/Users/aimuz/go'
GOPRIVATE='gitee.com/wisecloud,gitee.com/wisecloud-archive'
GOPROXY='https://goproxy.dev,https://goproxy.io,https://goproxy.cn,direct'
GOROOT='/Users/aimuz/workspace/go'
GOSUMDB='sum.golang.google.cn'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/Users/aimuz/workspace/go/pkg/tool/darwin_amd64'
GOVCS=''
GOVERSION='devel go1.22-f7b4f02ba0 Fri Aug 4 15:41:19 2023 +0000'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/Users/aimuz/workspace/go/src/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/pt/qtn3qrvs6n9b_944ggd01nj00000gn/T/go-build4175838830=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

Master branch compilations cannot be debugged using dlv.

Programs built with the -gcflags "all=-N -l" parameter cannot be debugged.

After investigation, the problem was caused by changes to https://go-review.googlesource.com/c/go/+/461697

When I change back to the historical version of the code, I can debug it properly

func DefaultPIE(goos, goarch string, isRace bool) bool {
	switch goos {
	case "android", "ios":
		return true
	case "windows":
		if isRace {
			// PIE is not supported with -race on windows;
			// see https://go.dev/cl/416174.
			return false
		}
		return true
	case "darwin":
		return goarch == "arm64"
	}
	return false
}
ld -v
@(#)PROGRAM:ld  PROJECT:dyld-1015.7
BUILD 16:59:22 Oct  1 2023
configured to support archs: armv6 armv7 armv7s arm64 arm64e arm64_32 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em
will use ld-classic for: armv6 armv7 armv7s arm64_32 i386 armv6m armv7k armv7m armv7em
LTO support using: LLVM version 15.0.0 (static support for 29, runtime is 29)
TAPI support using: Apple TAPI version 15.0.0 (tapi-1500.0.12.3)
Library search paths:
Framework search paths:

What did you expect to see?

Be able to use dlv to debug programs properly

What did you see instead?

cannot be debugged
@aimuz aimuz changed the title internal/platform: Adding -gcflags all=-N -l does not add debugging information. internal/platform: Adding -gcflags "all=-N -l" does not add debugging information. Nov 12, 2023
@aimuz
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aimuz commented Nov 12, 2023

When I add the -ldflags "-buildmode=exe" parameter, he works fine!

@aimuz aimuz changed the title internal/platform: Adding -gcflags "all=-N -l" does not add debugging information. compile: Adding -gcflags "all=-N -l" does not add debugging information. Nov 12, 2023
@aimuz aimuz changed the title compile: Adding -gcflags "all=-N -l" does not add debugging information. cmd/compile: Adding -gcflags "all=-N -l" does not add debugging information. Nov 12, 2023
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Nov 12, 2023
@aarzilli
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Debug info is always included in the executable, -N -l just disables optimizations. Your problem is different: probably an just old version of delve, but it's hard to tell for sure because you haven't really described what's happening.

@aimuz
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aimuz commented Nov 12, 2023

You are right, when I use the latest version of dlv he works fine, maybe older versions of dlv don't support PIE format executables?

@aarzilli
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It was probably this go-delve/delve#3467

@aimuz
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aimuz commented Nov 12, 2023

thank you

@aimuz aimuz closed this as completed Nov 12, 2023
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@aarzilli @gopherbot @aimuz