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fix small error in -X usage

Joe Shaw 2017-03-23 09:40:12 -04:00
parent 1076d849f2
commit f7b9c51f61
1 changed files with 1 additions and 1 deletions
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GcToolchainTricks.md

@ -104,6 +104,6 @@ package buildinfo
var BuildTime string var BuildTime string
``` ```
You can build the program using this package using `go build -ldflags="-X 'company/buildinfo=$(date)'"` to record the build time in the string. (The use of `$(date)` assumes you are using a Unix-style shell.) You can build the program using this package using `go build -ldflags="-X 'company/buildinfo.BuildTime=$(date)'"` to record the build time in the string. (The use of `$(date)` assumes you are using a Unix-style shell.)
The string variable must exist, and it must be a variable, not a constant. There is no warning for using the wrong name in the `-X` option. You can often find the name to use by running `go tool nm` on the program, but that will fail if the package name has any non-ASCII characters, or a `"` or `%` character. The string variable must exist, and it must be a variable, not a constant. There is no warning for using the wrong name in the `-X` option. You can often find the name to use by running `go tool nm` on the program, but that will fail if the package name has any non-ASCII characters, or a `"` or `%` character.