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cmd/compile: clarify help message for -L flag

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The file names reported in error messages by the compiler are
printed unchanged from the file names provided to the compiler;
the -L flag has no impact on the file names themselves, contrary
to what the old flag description suggested.

If an error is reported on a line that is affected by a //line
directive, an error message reports the file name and line as
controlled by the directive (i.e., the actual source position
is not known).

If the -L flag is provided, the actual source position is also
reported in square brackets.

This change documents this with an updated help string for the
flag.

For #36988.

Change-Id: I39ee35e6ff6cd5cfa44d87dabb05b8d78575d631
Reviewed-on: https://go-review.googlesource.com/c/go/+/395115
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
This commit is contained in:
Robert Griesemer 2022-03-23 13:29:43 -07:00
parent 209521c3e3
commit 9058080319
1 changed files with 1 additions and 1 deletions
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2
src/cmd/compile/internal/base/flag.go
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@ -58,7 +58,7 @@ type CmdFlags struct {
E CountFlag "help:\"debug symbol export\""
I func(string) "help:\"add `directory` to import search path\""
K CountFlag "help:\"debug missing line numbers\""
L CountFlag "help:\"show full file names in error messages\""
L CountFlag "help:\"also show actual source file names in error messages for positions affected by //line directives\""
N CountFlag "help:\"disable optimizations\""
S CountFlag "help:\"print assembly listing\""
// V is added by objabi.AddVersionFlag