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Diffstat (limited to 'docs/manual/macros.md')
| -rw-r--r-- | docs/manual/macros.md | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/docs/manual/macros.md b/docs/manual/macros.md index 14e287e70..ac891b07d 100644 --- a/docs/manual/macros.md +++ b/docs/manual/macros.md @@ -121,19 +121,19 @@ Sometimes it is useful to test whether a macro is defined or not. Syntax ``` %{?macro_name:value} -%{?!macro_name:value} +%{!?macro_name:value} ``` can be used for this purpose. `%{?macro_name:value}` is expanded to "value" if "macro_name" is defined, otherwise it is expanded to the empty string. -`%{?!macro_name:value}` is the negative variant. It is expanded to "value" +`%{!?macro_name:value}` negates the test. It is expanded to "value" if `macro_name` is not defined. Otherwise it is expanded to the empty string. Frequently used conditionally expanded macros are e.g. Define a macro if it is not defined: ``` -%{?!with_python3: %global with_python3 1} +%{!?with_python3: %global with_python3 1} ``` A macro that is expanded to 1 if "with_python3" is defined and 0 otherwise: |