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[PATCH 13/13] Switch -ftrack-macro-expansion=2 on by default.

Hopefully closing the series, this patch switches the compiler to
-ftrack-macro-expansion=2 by default.

Tested and bootstrapped on x86_64-unknown-linux-gnu against trunk.


	* init.c (cpp_create_reader): Switch -ftrack-macro-expansion=2 on
	by default.  Add comments.


	* cppopts.texi: Adjust for enabling -ftrack-macro-expansion=2 by
 gcc/doc/cppopts.texi |    2 ++
 libcpp/init.c        |    6 ++++++
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi
index 205d870..27b1095 100644
--- a/gcc/doc/cppopts.texi
+++ b/gcc/doc/cppopts.texi
@@ -617,6 +617,8 @@ tokens locations completely. This value is the most memory hungry.
 When this option is given no argument, the default parameter value is
+Note that -ftrack-macro-expansion=2 is activated by default.
 @item -fexec-charset=@var{charset}
 @opindex fexec-charset
 @cindex character set, execution
diff --git a/libcpp/init.c b/libcpp/init.c
index 5fa82ca..ba1e9cd 100644
--- a/libcpp/init.c
+++ b/libcpp/init.c
@@ -174,6 +174,12 @@ cpp_create_reader (enum c_lang lang, hash_table *table,
   CPP_OPTION (pfile, warn_dollars) = 1;
   CPP_OPTION (pfile, warn_variadic_macros) = 1;
   CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
+  /* By default, track locations of tokens resulting from macro
+     expansion.  The '2' means, track the locations with the highest
+     accuracy.  Read the comments for struct
+     cpp_options::track_macro_expansion to learn about the other
+     values.  */
+  CPP_OPTION (pfile, track_macro_expansion) = 2;
   CPP_OPTION (pfile, warn_normalize) = normalized_C;
   /* Default CPP arithmetic to something sensible for the host for the

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