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cmd/link: records absolute working directory in binary #22311

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aclements opened this Issue Oct 17, 2017 · 2 comments

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aclements commented Oct 17, 2017

The linker records the result of os.Getwd() in the DWARF compilation unit's DW_AT_comp_dir attribute. This is almost certainly wrong since we've been working to keep information like this out of the binary (for example, it's not affected by -trimpath). It's also additionally wrong because it records the linker's working directory, where it's supposed to record the compiler's working directory [1].

It would be nice if we could just omit it, but there's a comment in writelines that says "OS X linker requires compilation dir or absolute path in comp unit name to output debug info." We could perhaps always make the value "/". Or perhaps we could use the package's source directory (with -trimpath applied).

[1] DWARF4: A DW_AT_comp_dir attribute whose value is a null-terminated string containing the current
working directory of the compilation command that produced this compilation unit in
whatever form makes sense for the host system. See also @thanm's comment.

/cc @rsc @thanm

@ianlancetaylor ianlancetaylor added this to the Go1.11 milestone Mar 29, 2018

@ianlancetaylor ianlancetaylor modified the milestones: Go1.11, Go1.12 Jun 23, 2018

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ianlancetaylor commented Dec 7, 2018

@ianlancetaylor ianlancetaylor modified the milestones: Go1.12, Go1.13 Dec 7, 2018

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heschik commented Dec 7, 2018

Oh, this is an old bug. It's hardcoded to . now.

func getCompilationDir() string {

@heschik heschik closed this Dec 7, 2018

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