diff options
Diffstat (limited to 'gcc/doc/cppopts.texi')
| -rw-r--r-- | gcc/doc/cppopts.texi | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi index 1b6307b..a6b7eb4 100644 --- a/gcc/doc/cppopts.texi +++ b/gcc/doc/cppopts.texi @@ -16,11 +16,14 @@ Predefine @var{name} as a macro, with definition @code{1}. @item -D @var{name}=@var{definition} -Predefine @var{name} as a macro, with definition @var{definition}. -There are no restrictions on the contents of @var{definition}, but if -you are invoking the preprocessor from a shell or shell-like program you -may need to use the shell's quoting syntax to protect characters such as -spaces that have a meaning in the shell syntax. +The contents of @var{definition} are tokenized and processed as if +they appeared during translation phase three in a @samp{#define} +directive. In particular, the definition will be truncated by +embedded newline characters. + +If you are invoking the preprocessor from a shell or shell-like +program you may need to use the shell's quoting syntax to protect +characters such as spaces that have a meaning in the shell syntax. If you wish to define a function-like macro on the command line, write its argument list with surrounding parentheses before the equals sign |