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[gcc.git] / gcc / flags.h

/* Compilation switch flag definitions for GNU CC.
   Copyright (C) 1987, 1988 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Name of the input .c file being compiled.  */
extern char *main_input_filename;

enum debug_info_type
{
  NO_DEBUG,	    /* Write no debug info.  */
  DBX_DEBUG,	    /* Write BSD .stabs for DBX (using dbxout.c).  */
  SDB_DEBUG,	    /* Write COFF for (old) SDB (using sdbout.c).  */
  DWARF_DEBUG,	    /* Write Dwarf debug info (using dwarfout.c).  */
  XCOFF_DEBUG	    /* Write IBM/Xcoff debug info (using dbxout.c).  */
};

/* Specify which kind of debugging info to generate.  */
extern enum debug_info_type write_symbols;

enum debug_info_level
{
  DINFO_LEVEL_NONE,	/* Write no debugging info.  */
  DINFO_LEVEL_TERSE,	/* Write minimal info to support tracebacks only.  */
  DINFO_LEVEL_NORMAL,	/* Write info for all declarations (and line table). */
  DINFO_LEVEL_VERBOSE	/* Write normal info plus #define/#undef info.  */
};

/* Specify how much debugging info to generate.  */
extern enum debug_info_level debug_info_level;

/* Nonzero means use GNU-only extensions in the generated symbolic
   debugging information.  */
extern int use_gnu_debug_info_extensions;

/* Nonzero means do optimizations.  -opt.  */

extern int optimize;

/* Nonzero means do stupid register allocation.  -noreg.
   Currently, this is 1 if `optimize' is 0.  */

extern int obey_regdecls;

/* Don't print functions as they are compiled and don't print
   times taken by the various passes.  -quiet.  */

extern int quiet_flag;

/* Don't print warning messages.  -w.  */

extern int inhibit_warnings;

/* Do print extra warnings (such as for uninitialized variables).  -W.  */

extern int extra_warnings;

/* Nonzero to warn about unused local variables.  */

extern int warn_unused;

/* Nonzero to warn about variables used before they are initialized.  */

extern int warn_uninitialized;

/* Nonzero means warn about all declarations which shadow others.   */

extern int warn_shadow;

/* Warn if a switch on an enum fails to have a case for every enum value.  */

extern int warn_switch;

/* Nonzero means warn about function definitions that default the return type
   or that use a null return and have a return-type other than void.  */

extern int warn_return_type;

/* Nonzero means warn about pointer casts that increase the required
   alignment of the target type (and might therefore lead to a crash
   due to a misaligned access).  */

extern int warn_cast_align;

/* Nonzero means warn about any identifiers that match in the first N
   characters.  The value N is in `id_clash_len'.  */

extern int warn_id_clash;
extern int id_clash_len;

/* Warn if a function returns an aggregate,
   since there are often incompatible calling conventions for doing this.  */

extern int warn_aggregate_return;

/* Nonzero if generating code to do profiling.  */

extern int profile_flag;

/* Nonzero if generating code to do profiling on the basis of basic blocks.  */

extern int profile_block_flag;

/* Nonzero for -pedantic switch: warn about anything
   that standard C forbids.  */

extern int pedantic;

/* Temporarily suppress certain warnings.
   This is set while reading code from a system header file.  */

extern int in_system_header;

/* Nonzero for -dp: annotate the assembly with a comment describing the
   pattern and alternative used.  */

extern int flag_print_asm_name;
\f
/* Now the symbols that are set with `-f' switches.  */

/* Nonzero means `char' should be signed.  */

extern int flag_signed_char;

/* Nonzero means give an enum type only as many bytes as it needs.  */

extern int flag_short_enums;

/* Nonzero for -fcaller-saves: allocate values in regs that need to
   be saved across function calls, if that produces overall better code.
   Optional now, so people can test it.  */

extern int flag_caller_saves;

/* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */

extern int flag_pcc_struct_return;

/* Nonzero for -fforce-mem: load memory value into a register
   before arithmetic on it.  This makes better cse but slower compilation.  */

extern int flag_force_mem;

/* Nonzero for -fforce-addr: load memory address into a register before
   reference to memory.  This makes better cse but slower compilation.  */

extern int flag_force_addr;

/* Nonzero for -fdefer-pop: don't pop args after each function call;
   instead save them up to pop many calls' args with one insns.  */

extern int flag_defer_pop;

/* Nonzero for -ffloat-store: don't allocate floats and doubles
   in extended-precision registers.  */

extern int flag_float_store;

/* Nonzero enables strength-reduction in loop.c.  */

extern int flag_strength_reduce;

/* Nonzero enables loop unrolling in unroll.c.  Only loops for which the
   number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
   UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
   unrolled.  */

extern int flag_unroll_loops;

/* Nonzero enables loop unrolling in unroll.c.  All loops are unrolled.
   This is generally not a win.  */

extern int flag_unroll_all_loops;

/* Nonzero for -fcse-follow-jumps:
   have cse follow jumps to do a more extensive job.  */

extern int flag_cse_follow_jumps;

/* Nonzero for -fcse-skip-blocks:
   have cse follow a branch around a block.  */

extern int flag_cse_skip_blocks;

/* Nonzero for -fexpensive-optimizations:
   perform miscellaneous relatively-expensive optimizations.  */
extern int flag_expensive_optimizations;

/* Nonzero for -fwritable-strings:
   store string constants in data segment and don't uniquize them.  */

extern int flag_writable_strings;

/* Nonzero means don't put addresses of constant functions in registers.
   Used for compiling the Unix kernel, where strange substitutions are
   done on the assembly output.  */

extern int flag_no_function_cse;

/* Nonzero for -fomit-frame-pointer:
   don't make a frame pointer in simple functions that don't require one.  */

extern int flag_omit_frame_pointer;

/* Nonzero to inhibit use of define_optimization peephole opts.  */

extern int flag_no_peephole;

/* Nonzero means all references through pointers are volatile.  */

extern int flag_volatile;

/* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
   operations in the interest of optimization.  For example it allows
   GCC to assume arguments to sqrt are nonnegative numbers, allowing
   faster code for sqrt to be generated. */

extern int flag_fast_math;

/* Nonzero means make functions that look like good inline candidates
   go inline.  */

extern int flag_inline_functions;

/* Nonzero for -fkeep-inline-functions: even if we make a function
   go inline everywhere, keep its defintion around for debugging
   purposes.  */

extern int flag_keep_inline_functions;

/* Nonzero means that functions declared `inline' will be treated
   as `static'.  Prevents generation of zillions of copies of unused
   static inline functions; instead, `inlines' are written out
   only when actually used.  Used in conjunction with -g.  Also
   does the right thing with #pragma interface.  */

extern int flag_no_inline;

/* Nonzero if we are only using compiler to check syntax errors.  */

extern int flag_syntax_only;

/* Nonzero means we should save auxiliary info into a .X file.  */

extern int flag_gen_aux_info;

/* Nonzero means make the text shared if supported.  */

extern int flag_shared_data;

/* flag_schedule_insns means schedule insns within basic blocks (before
   local_alloc).
   flag_schedule_insns_after_reload means schedule insns after
   global_alloc.  */

extern int flag_schedule_insns;
extern int flag_schedule_insns_after_reload;

/* Nonzero means put things in delayed-branch slots if supported. */

extern int flag_delayed_branch;

/* Nonzero means pretend it is OK to examine bits of target floats,
   even if that isn't true.  The resulting code will have incorrect constants,
   but the same series of instructions that the native compiler would make.  */

extern int flag_pretend_float;

/* Nonzero means change certain warnings into errors.
   Usually these are warnings about failure to conform to some standard.  */

extern int flag_pedantic_errors;

/* Nonzero means generate position-independent code.
   This is not fully implemented yet.  */

extern int flag_pic;

/* Nonzero means place uninitialized global data in the bss section.  */

extern int flag_no_common;

/* -finhibit-size-directive inhibits output of .size for ELF.
   This is used only for compiling crtstuff.c,
   and it may be extended to other effects
   needed for crtstuff.c on other systems.  */
extern int flag_inhibit_size_directive;

/* -fverbose-asm causes extra commentary information to be produced in
   the generated assembly code (to make it more readable).  This option
   is generally only of use to those who actually need to read the
   generated assembly code (perhaps while debugging the compiler itself).  */

extern int flag_verbose_asm;

/* -fgnu-linker specifies use of the GNU linker for initializations.
   -fno-gnu-linker says that collect will be used.  */
extern int flag_gnu_linker;
\f
/* Other basic status info about current function.  */

/* Nonzero means current function must be given a frame pointer.
   Set in stmt.c if anything is allocated on the stack there.
   Set in reload1.c if anything is allocated on the stack there.  */

extern int frame_pointer_needed;

/* Set nonzero if jump_optimize finds that control falls through
   at the end of the function.  */

extern int can_reach_end;

/* Nonzero if function being compiled receives nonlocal gotos
   from nested functions.  */

extern int current_function_has_nonlocal_label;