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[patch, docs] Document --enable-stage1-langauges configure option.

This is a revised version of the patch I proposed six weeks ago, which takes into account Paolo Bonzini's suggestions on the content. (Sorry for taking so long to follow up on this, Paolo!)

Tested with "make pdf" and "make info" on i686-pc-linux-gnu. Ok for trunk?

2007-03-11  Brooks Moses  <>

	PR 30635
	* doc/install.texi: Document --enable-stage1-languages


- Brooks
Index: install.texi
--- install.texi	(revision 122674)
+++ install.texi	(working copy)
@@ -1136,6 +1136,21 @@
 work anymore, as those language sub-directories might not have been
+@item --enable-stage1-languages=@var{lang1},@var{lang2},@dots{}
+Specify that a particular subset of compilers and their runtime
+libraries should be built with the system C compiler during stage 1 of
+the bootstrap process, rather than only in later stages with the
+bootstrapped C compiler.  The list of valid values is the same as for
+@option{--enable-languages}, and the option @code{all} will select all
+of the languages enabled by @option{--enable-languages}.  This option is
+primarily useful for GCC development; for instance, when a development
+version of the compiler cannot bootstrap due to compiler bugs, or when
+one is debugging front ends other than the C front end.  When this
+option is used, one can then build the target libraries for the
+specified languages with the stage-1 compiler by using @command{make
+stage1-bubble all-target}, or run the testsuite on the stage-1 compiler
+for the specified languages using @command{make stage1-start check-gcc}.
 @item --disable-libada
 Specify that the run-time libraries and tools used by GNAT should not
 be built.  This can be useful for debugging, or for compatibility with

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