* ldgram.y: Add section_phdr field to %union.
(section): Handle phdr_opt result. Add OVERLAY case.
(opt_exp_without_type): New nonterminal.
(phdr_opt): Return list of phdrs.
(overlay_section): New nonterminal.
* ldlang.c: Include <ctype.h>.
(lang_leave_output_section_statement): Add phdrs parameter.
Change all callers.
(lang_section_in_phdr): Remove.
(overlay_vma, overlay_lmn, overlay_max): New static variables.
(struct overlay_list): Define.
(overlay_list): New static variable.
(lang_enter_overlay, lang_enter_overlay_section): New functions.
(lang_leave_overlay_section, lang_leave_overlay): New functions.
* ldlang.h (lang_leave_output_section_statement): Update
declaration for new parameter.
(lang_section_in_phdr): Don't declare.
(lang_enter_overlay, lang_enter_overlay_section): Declare.
(lang_leave_overlay_section, lang_leave_overlay): Declare.
* ld.texinfo (Overlays): New node under SECTIONS, documenting
overlays.
* ldlex.l: Recognize MAX and MIN.
* ldgram.y (MAX, MIN): New terminals.
(exp): Recognize MAX and MIN.
* ldexp.c (fold_binary): Handle MAX and MIN.
* ld.texinfo (Arithmetic Functions): Document MAX and MIN.
* ld.texinfo (PHDRS): Use @cindex, not @kindex, for program header
index entries.
* ldgram.y (SIZEOF, ADDR): Do not specify type.
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