* gold.cc (queue_initial_tasks): Pass incremental base filename

	to Output_file::open_base_file; don't print error message.
	* incremental-dump.cc (main): Adjust call to
	Output_file::open_for_modification.
	* incremental-dump.cc (main): Likewise.
	* incremental.cc (Incremental_inputs::report_command_line):
	Ignore --incremental-base option when comparing command lines.
	Ignore parameter when given as separate argument.
	* options.h (class General_options): Add --incremental-base.
	* output.cc (Output_file::Output_file):
	(Output_file::open_base_file): Add base_name and writable parameters;
	read base file into new file; print error message here.
	(Output_file::map_no_anonymous): Add writable parameter; adjust all
	callers.
	* output.h (Output_file::open_for_modification): Rename to...
	(Output_file::open_base_file): ...this; add base_name and
	writable parameters; adjust all callers.
	(Output_file::map_no_anonymous): Add writable parameter; adjust all
	callers.
	* testsuite/Makefile.am (incremental_test_4): Test
	--incremental-base.
	* testsuite/Makefile.in: Regenerate.

1 files changed, 4 insertions, 3 deletions

diff --git a/gold/output.h b/gold/output.h
index 8ca3598ab0..da2e9cb735 100644
--- a/gold/output.h
+++ b/gold/output.h
@@ -4188,9 +4188,10 @@ class Output_file
 
   // Try to open an existing file. Returns false if the file doesn't
   // exist, has a size of 0 or can't be mmaped.  This method is
-  // thread-unsafe.
+  // thread-unsafe.  If BASE_NAME is not NULL, use the contents of
+  // that file as the base for incremental linking.
   bool
-  open_for_modification();
+  open_base_file(const char* base_name, bool writable);
 
   // Open the output file.  FILE_SIZE is the final size of the file.
   // If the file already exists, it is deleted/truncated.  This method
@@ -4275,7 +4276,7 @@ class Output_file
 
   // Map the file into memory.
   bool
-  map_no_anonymous();
+  map_no_anonymous(bool);
 
   // Unmap the file from memory (and flush to disk buffers).
   void