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Diffstat (limited to 'gcc/doc/cppopts.texi')
| -rw-r--r-- | gcc/doc/cppopts.texi | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi index 73db832..dbc8f0e 100644 --- a/gcc/doc/cppopts.texi +++ b/gcc/doc/cppopts.texi @@ -518,6 +518,28 @@ Search @var{dir} only for header files requested with If @var{dir} begins with @code{=}, then the @code{=} will be replaced by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}. +@item -fdirectives-only +@opindex fdirectives-only +When preprocessing, handle directives, but do not expand macros. + +The option's behavior depends on the @option{-E} and @option{-fpreprocessed} +options. + +With @option{-E}, preprocessing is limited to the handling of directives +such as @code{#define}, @code{#ifdef}, and @code{#error}. Other +preprocessor operations, such as macro expansion and trigraph +conversion are not performed. In addition, the @option{-dD} option is +implicitly enabled. + +With @option{-fpreprocessed}, predefinition of command line and most +builtin macros is disabled. Macros such as @code{__LINE__}, which are +contextually dependent, are handled normally. This enables compilation of +files previously preprocessed with @code{-E -fdirectives-only}. + +With both @option{-E} and @option{-fpreprocessed}, the rules for +@option{-fpreprocessed} take precedence. This enables full preprocessing of +files previously preprocessed with @code{-E -fdirectives-only}. + @item -fdollars-in-identifiers @opindex fdollars-in-identifiers @anchor{fdollars-in-identifiers} |