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cmd/link: document limitation of -X 

Fixes #26042

Change-Id: Ica16f14a65c03659a19926852cca5e554c99baf1
Reviewed-on: https://go-review.googlesource.com/120935
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
LE Manh Cuong 2018-06-26 13:48:05 +07:00 committed by Ian Lance Taylor
parent f040e439cb
commit 6dd789fdea
2 changed files with 4 additions and 1 deletions
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4
src/cmd/link/doc.go
View File

@ -39,8 +39,10 @@ Flags:
Print linker version and exit. Print linker version and exit.
-X importpath.name=value -X importpath.name=value
Set the value of the string variable in importpath named name to value. Set the value of the string variable in importpath named name to value.
This is only effective if the variable is declared in the source code either uninitialized
or initialized to a constant string expression. -X will not work if the initializer makes
a function call or refers to other variables.
Note that before Go 1.5 this option took two separate arguments. Note that before Go 1.5 this option took two separate arguments.
Now it takes one argument split on the first = sign.
-buildmode mode -buildmode mode
Set build mode (default exe). Set build mode (default exe).
-cpuprofile file -cpuprofile file

1
src/cmd/link/internal/ld/data.go
View File

@ -828,6 +828,7 @@ func addstrdata1(ctxt *Link, arg string) {
strdata[name] = value strdata[name] = value
} }
// addstrdata sets the initial value of the string variable name to value.
func addstrdata(ctxt *Link, name, value string) { func addstrdata(ctxt *Link, name, value string) {
s := ctxt.Syms.ROLookup(name, 0) s := ctxt.Syms.ROLookup(name, 0)
if s == nil || s.Gotype == nil { if s == nil || s.Gotype == nil {