cpp.texi: Update for -MQ.

        * cpp.texi: Update for -MQ.
        * cppinit.c (cpp_create_reader): Always create pfile->deps.
        (cpp_cleanup): Always free pfile->deps.
        (initialize_dependency_output): Don't create pfile->deps.
        (cpp_handle_option): Similarly.
        (OPT_MQ): New.
        * gcc.c (cpp_options): Handle -MQ.
        (DEFAULT_WORD_SWITCH_TAKES_ARG): Add -MQ.
        * mkdeps.c (base_name): Remove.
        (deps_init): Don't allocate vector space until it's needed.
        (deps_free): Only free vectors if allocated.
        (deps_add_target, deps_add_dep): Update for initial allocation.
        (deps_add_default_target): Don't strip to the base_name.

From-SVN: r38735

1 files changed, 19 insertions, 7 deletions

diff --git a/gcc/cpp.texi b/gcc/cpp.texi
index 7df4531..1f8121f 100644
--- a/gcc/cpp.texi
+++ b/gcc/cpp.texi
@@ -3491,24 +3491,36 @@ This is typical output:-
 /tmp/test.h:
 @end smallexample
 
+@item -MQ @var{target}
 @item -MT @var{target}
 @findex -MT
-By default CPP uses the base file name and appends the object suffix,
-normally ``.o'', to it to obtain the name of the target for dependency
-generation.  With @samp{-MT} you can specify a target yourself,
-overriding the default one.
+@findex -MQ
+By default CPP uses the main file name, including any path, and appends
+the object suffix, normally ``.o'', to it to obtain the name of the
+target for dependency generation.  With @samp{-MT} you can specify a
+target yourself, overriding the default one.
 
 If you want multiple targets, you can specify them as a single argument
 to @samp{-MT}, or use multiple @samp{-MT} options.
 
 The targets you specify are output in the order they appear on the
-command line, and, unlike the default target, are not quoted for MAKE.
-This allows you to do things like, for example,
+command line.  @samp{-MQ} is identical to @samp{-MT}, except that the
+target name is quoted for Make, but with @samp{-MT} it isn't.  For
+example, -MT '$(objpfx)foo.o' gives
 
 @smallexample
--MT '$(objpfx)foo.o $(objpfx)foo.os $(objpfx)foo.op'
+$(objpfx)foo.o: /tmp/foo.c
 @end smallexample
 
+but -MQ '$(objpfx)foo.o' gives
+
+@smallexample
+$$(objpfx)foo.o: /tmp/foo.c
+@end smallexample
+
+The default target is automatically quoted, as if it were given with
+@samp{-MQ}.
+
 @item -H
 @findex -H
 Print the name of each header file used, in addition to other normal