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Diffstat (limited to 'gcc/doc/cppopts.texi')
| -rw-r--r-- | gcc/doc/cppopts.texi | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi index 6bfa46e..7af15dd 100644 --- a/gcc/doc/cppopts.texi +++ b/gcc/doc/cppopts.texi @@ -287,6 +287,17 @@ When this option is given no argument, the default parameter value is Note that @code{-ftrack-macro-expansion=2} is activated by default. +@item -fmacro-prefix-map=@var{old}=@var{new} +@opindex fmacro-prefix-map +When preprocessing files residing in directory @file{@var{old}}, +expand the @code{__FILE__} and @code{__BASE_FILE__} macros as if the +files resided in directory @file{@var{new}} instead. This can be used +to change an absolute path to a relative path by using @file{.} for +@var{new} which can result in more reproducible builds that are +location independent. This option also affects +@code{__builtin_FILE()} during compilation. See also +@option{-ffile-prefix-map}. + @item -fexec-charset=@var{charset} @opindex fexec-charset @cindex character set, execution @@ -534,4 +545,3 @@ token in the output is preceded by the dump of the map its location belongs to. When used from GCC without @option{-E}, this option has no effect. - |