c.opt: Introduce -fworking-directory.

* c.opt: Introduce -fworking-directory.
* doc/cpp.texi, doc/invoke.texi, doc/cppopts.texi: Document it.
* c-common.h (flag_working_directory): Declare.
* c-common.c (flag_working_directory): Define.
* c-opts.c (c_common_handle_options): Set it.
(sanitize_cpp_opts): Set...
* cpplib.h (struct cpp_options): ... working_directory option.
(struct cpp_callbacks): Add dir_change.
* cppinit.c (read_original_filename): Call...
(read_original_directory): New.  Look for # 1 "directory//"
and process it.
(cpp_read_main_file): Call dir_change callback if working_directory
option is set.
* gcc.c (cpp_unique_options): Pass -g*.
* c-lex.c (cb_dir_change): New.
(init_c_lex): Set dir_change callback.
* toplev.c (src_pwd): New static variable.
(set_src_pwd, get_src_pwd): New functions.
* toplev.h (get_src_pwd, set_src_pwd): Declare.
* dbxout.c (dbxout_init): Call get_src_pwd() instead of getpwd().
* dwarf2out.c (gen_compile_unit_die): Likewise.
* dwarfout.c (output_compile_unit_die, dwarfout_init): Likewise.

From-SVN: r70189

3 files changed, 22 insertions, 3 deletions

diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi
index a6ff40c..2db1ee1 100644
--- a/gcc/doc/cpp.texi
+++ b/gcc/doc/cpp.texi
@@ -4133,7 +4133,9 @@ without notice.
 cpp [@option{-D}@var{macro}[=@var{defn}]@dots{}] [@option{-U}@var{macro}]
     [@option{-I}@var{dir}@dots{}] [@option{-W}@var{warn}@dots{}]
     [@option{-M}|@option{-MM}] [@option{-MG}] [@option{-MF} @var{filename}]
-    [@option{-MP}] [@option{-MQ} @var{target}@dots{}] [@option{-MT} @var{target}@dots{}]
+    [@option{-MP}] [@option{-MQ} @var{target}@dots{}]
+    [@option{-MT} @var{target}@dots{}]
+    [@option{-P}] [@option{-fno-working-directory}] 
     [@option{-x} @var{language}] [@option{-std=}@var{standard}]
     @var{infile} @var{outfile}
 
diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi
index 8096763..4988227 100644
--- a/gcc/doc/cppopts.texi
+++ b/gcc/doc/cppopts.texi
@@ -1,4 +1,4 @@
-@c Copyright (c) 1999, 2000, 2001, 2002
+@c Copyright (c) 1999, 2000, 2001, 2002, 2003
 @c Free Software Foundation, Inc.
 @c This is part of the CPP and GCC manuals.
 @c For copying conditions, see the file gcc.texi.
@@ -513,6 +513,22 @@ corresponds to the width of @code{wchar_t}.  As with
 by the system's @code{iconv} library routine; however, you will have
 problems with encodings that do not fit exactly in @code{wchar_t}.
 
+@item -fworking-directory
+@opindex fworking-directory
+@opindex fno-working-directory
+Enable generation of linemarkers in the preprocessor output that will
+let the compiler know the current working directory at the time of
+preprocessing.  When this option is enabled, the preprocessor will
+emit, after the initial linemarker, a second linemarker with the
+current working directory followed by two slashes.  GCC will use this
+directory, when it's present in the preprocessed input, as the
+directory emitted as the current working directory in some debugging
+information formats.  This option is implicitly enabled if debugging
+information is enabled, but this can be inhibited with the negated
+form @option{-fno-working-directory}.  If the @option{-P} flag is
+present in the command line, this option has no effect, since no
+@code{#line} directives are emitted whatsoever.
+
 @item -fno-show-column
 @opindex fno-show-column
 Do not print column numbers in diagnostics.  This may be necessary if
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 518b527..40cba57 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -301,7 +301,8 @@ in the following sections.
 -include @var{file}  -imacros @var{file} @gol
 -iprefix @var{file}  -iwithprefix @var{dir} @gol
 -iwithprefixbefore @var{dir}  -isystem @var{dir} @gol
--M  -MM  -MF  -MG  -MP  -MQ  -MT  -nostdinc  -P  -remap @gol
+-M  -MM  -MF  -MG  -MP  -MQ  -MT  -nostdinc  @gol
+-P  -fworking-directory  -remap @gol
 -trigraphs  -undef  -U@var{macro}  -Wp,@var{option} @gol
 -Xpreprocessor @var{option}}