Add a new option to the linker: --error-handling-script=<NAME>. Run the script <NAME> if an undefined symbol or unfound library error is encountered.

	PR 26626
	* ldmain.c (undefined_symbol): If an error handlign script is
	available, call it.
	* ldfile.c  (error_handling_script): Declare.
	(ldfile_open_file): If a library cannot be found and an error
	handling script is available, call it.
	* ldmain.h  (error_handling_script): Prototype.
	* ldlex.h (OPTION_ERROR_HANDLING_SCRIPT): Define.
	* lexsup.c (ld_options): Add --error-handling-script.
	(parse_args): Add support for --errror-handling-script.
	* ld.texi: Document the new feature.
	* configure.ac: Add --error-handling-script option to disable
	support for the new feature.
	* NEWS: Mention the new feature.
	* config.in: Regenerate.
	* configure: Regenerate.

1 files changed, 15 insertions, 0 deletions

diff --git a/ld/ld.texi b/ld/ld.texi
index 66bede2..95f31ea 100644
--- a/ld/ld.texi
+++ b/ld/ld.texi
@@ -1923,6 +1923,21 @@ architecture.  This is used, for example, to dynamically select an
 appropriate memset function.
 @end itemize
 
+@kindex --error-handling-script=@var{scriptname}
+@item --error-handling-script=@var{scriptname}
+If this option is provided then the linker will invoke
+@var{scriptname} whenever an error is encountered.  Currently however
+only two kinds of error are supported: missing symbols and missing
+libraries.  Two arguments will be passed to script: the keyword
+``missing-symbol'' or `missing-lib'' and the @var{name} of the 
+missing symbol or library.  The intention is that the script will
+provide suggestions to the user as to where the symbol or library
+might be found.  After the script has finished then the normal linker
+error message will be displayed.
+
+The availability of this option is controlled by a configure time
+switch, so it may not be present in specific implementations.
+
 @kindex --no-undefined-version
 @item --no-undefined-version
 Normally when a symbol has an undefined version, the linker will ignore