502 lines
16 KiB
C
502 lines
16 KiB
C
/* Compilation switch flag definitions for GNU CC.
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Copyright (C) 1987, 88, 94, 95, 96, 97, 1998 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Name of the input .c file being compiled. */
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extern char *main_input_filename;
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enum debug_info_type
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{
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NO_DEBUG, /* Write no debug info. */
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DBX_DEBUG, /* Write BSD .stabs for DBX (using dbxout.c). */
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SDB_DEBUG, /* Write COFF for (old) SDB (using sdbout.c). */
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DWARF_DEBUG, /* Write Dwarf debug info (using dwarfout.c). */
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DWARF2_DEBUG, /* Write Dwarf v2 debug info (using dwarf2out.c). */
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XCOFF_DEBUG /* Write IBM/Xcoff debug info (using dbxout.c). */
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};
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/* Specify which kind of debugging info to generate. */
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extern enum debug_info_type write_symbols;
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enum debug_info_level
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{
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DINFO_LEVEL_NONE, /* Write no debugging info. */
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DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */
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DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */
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DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */
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};
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/* Specify how much debugging info to generate. */
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extern enum debug_info_level debug_info_level;
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/* Nonzero means use GNU-only extensions in the generated symbolic
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debugging information. */
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extern int use_gnu_debug_info_extensions;
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/* Nonzero means do optimizations. -opt. */
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extern int optimize;
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/* Nonzero means optimize for size. -Os. */
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extern int optimize_size;
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/* Nonzero means do stupid register allocation. -noreg.
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Currently, this is 1 if `optimize' is 0. */
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extern int obey_regdecls;
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/* Don't print functions as they are compiled and don't print
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times taken by the various passes. -quiet. */
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extern int quiet_flag;
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/* Don't print warning messages. -w. */
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extern int inhibit_warnings;
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/* Do print extra warnings (such as for uninitialized variables). -W. */
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extern int extra_warnings;
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/* Nonzero to warn about unused local variables. */
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extern int warn_unused;
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/* Nonzero means warn if inline function is too large. */
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extern int warn_inline;
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/* Nonzero to warn about variables used before they are initialized. */
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extern int warn_uninitialized;
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/* Zero if unknown pragmas are ignored
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One if the compiler should warn about an unknown pragma not in
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a system include file.
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Greater than one if the compiler should warn for all unknown
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pragmas. */
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extern int warn_unknown_pragmas;
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/* Nonzero means warn about all declarations which shadow others. */
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extern int warn_shadow;
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/* Warn if a switch on an enum fails to have a case for every enum value. */
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extern int warn_switch;
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/* Nonzero means warn about function definitions that default the return type
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or that use a null return and have a return-type other than void. */
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extern int warn_return_type;
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/* Nonzero means warn about pointer casts that increase the required
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alignment of the target type (and might therefore lead to a crash
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due to a misaligned access). */
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extern int warn_cast_align;
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/* Nonzero means warn that dbx info for template class methods isn't fully
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supported yet. */
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extern int warn_template_debugging;
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/* Nonzero means warn about any identifiers that match in the first N
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characters. The value N is in `id_clash_len'. */
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extern int warn_id_clash;
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extern unsigned id_clash_len;
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/* Nonzero means warn about any objects definitions whose size is larger
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than N bytes. Also want about function definitions whose returned
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values are larger than N bytes. The value N is in `larger_than_size'. */
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extern int warn_larger_than;
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extern unsigned larger_than_size;
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/* Warn if a function returns an aggregate,
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since there are often incompatible calling conventions for doing this. */
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extern int warn_aggregate_return;
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/* Nonzero means that -Wformat accepts certain non-ANSI formats. */
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extern int flag_format_extensions;
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/* Nonzero if generating code to do profiling. */
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extern int profile_flag;
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/* Nonzero if generating code to do profiling on the basis of basic blocks. */
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extern int profile_block_flag;
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/* Nonzero if generating code to profile program flow graph arcs. */
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extern int profile_arc_flag;
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/* Nonzero if generating info for gcov to calculate line test coverage. */
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extern int flag_test_coverage;
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/* Nonzero indicates that branch taken probabilities should be calculated. */
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extern int flag_branch_probabilities;
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/* Nonzero for -pedantic switch: warn about anything
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that standard C forbids. */
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extern int pedantic;
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/* Temporarily suppress certain warnings.
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This is set while reading code from a system header file. */
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extern int in_system_header;
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/* Nonzero for -dp: annotate the assembly with a comment describing the
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pattern and alternative used. */
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extern int flag_print_asm_name;
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/* Now the symbols that are set with `-f' switches. */
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/* Nonzero means `char' should be signed. */
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extern int flag_signed_char;
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/* Nonzero means give an enum type only as many bytes as it needs. */
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extern int flag_short_enums;
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/* Nonzero for -fcaller-saves: allocate values in regs that need to
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be saved across function calls, if that produces overall better code.
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Optional now, so people can test it. */
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extern int flag_caller_saves;
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/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
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extern int flag_pcc_struct_return;
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/* Nonzero for -fforce-mem: load memory value into a register
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before arithmetic on it. This makes better cse but slower compilation. */
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extern int flag_force_mem;
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/* Nonzero for -fforce-addr: load memory address into a register before
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reference to memory. This makes better cse but slower compilation. */
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extern int flag_force_addr;
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/* Nonzero for -fdefer-pop: don't pop args after each function call;
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instead save them up to pop many calls' args with one insns. */
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extern int flag_defer_pop;
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/* Nonzero for -ffloat-store: don't allocate floats and doubles
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in extended-precision registers. */
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extern int flag_float_store;
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/* Nonzero enables strength-reduction in loop.c. */
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extern int flag_strength_reduce;
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/* Nonzero enables loop unrolling in unroll.c. Only loops for which the
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number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
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UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
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unrolled. */
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extern int flag_unroll_loops;
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/* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
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This is generally not a win. */
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extern int flag_unroll_all_loops;
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/* Nonzero forces all invariant computations in loops to be moved
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outside the loop. */
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extern int flag_move_all_movables;
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/* Nonzero forces all general induction variables in loops to be
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strength reduced. */
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extern int flag_reduce_all_givs;
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/* Nonzero for -fcse-follow-jumps:
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have cse follow jumps to do a more extensive job. */
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extern int flag_cse_follow_jumps;
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/* Nonzero for -fcse-skip-blocks:
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have cse follow a branch around a block. */
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extern int flag_cse_skip_blocks;
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/* Nonzero for -fexpensive-optimizations:
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perform miscellaneous relatively-expensive optimizations. */
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extern int flag_expensive_optimizations;
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/* Nonzero for -fwritable-strings:
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store string constants in data segment and don't uniquize them. */
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extern int flag_writable_strings;
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/* Nonzero means don't put addresses of constant functions in registers.
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Used for compiling the Unix kernel, where strange substitutions are
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done on the assembly output. */
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extern int flag_no_function_cse;
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/* Nonzero for -fomit-frame-pointer:
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don't make a frame pointer in simple functions that don't require one. */
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extern int flag_omit_frame_pointer;
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/* Nonzero to inhibit use of define_optimization peephole opts. */
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extern int flag_no_peephole;
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/* Nonzero means all references through pointers are volatile. */
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extern int flag_volatile;
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/* Nonzero means treat all global and extern variables as global. */
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extern int flag_volatile_global;
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/* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
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operations in the interest of optimization. For example it allows
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GCC to assume arguments to sqrt are nonnegative numbers, allowing
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faster code for sqrt to be generated. */
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extern int flag_fast_math;
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/* Nonzero means to run loop optimizations twice. */
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extern int flag_rerun_loop_opt;
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/* Nonzero means to assume that a structure or an array reference at
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a varying address cannot alias a scalar at a fixed address. */
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extern int flag_structure_noalias;
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/* Nonzero means make functions that look like good inline candidates
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go inline. */
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extern int flag_inline_functions;
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/* Nonzero for -fkeep-inline-functions: even if we make a function
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go inline everywhere, keep its definition around for debugging
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purposes. */
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extern int flag_keep_inline_functions;
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/* Nonzero means that functions declared `inline' will be treated
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as `static'. Prevents generation of zillions of copies of unused
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static inline functions; instead, `inlines' are written out
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only when actually used. Used in conjunction with -g. Also
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does the right thing with #pragma interface. */
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extern int flag_no_inline;
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/* Nonzero if we are only using compiler to check syntax errors. */
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extern int flag_syntax_only;
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/* Nonzero means we should save auxiliary info into a .X file. */
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extern int flag_gen_aux_info;
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/* Nonzero means make the text shared if supported. */
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extern int flag_shared_data;
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/* flag_schedule_insns means schedule insns within basic blocks (before
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local_alloc).
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flag_schedule_insns_after_reload means schedule insns after
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global_alloc. */
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extern int flag_schedule_insns;
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extern int flag_schedule_insns_after_reload;
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#ifdef HAIFA
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/* The following flags have effect only for scheduling before register
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allocation:
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flag_schedule_interblock means schedule insns accross basic blocks.
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flag_schedule_speculative means allow speculative motion of non-load insns.
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flag_schedule_speculative_load means allow speculative motion of some
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load insns.
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flag_schedule_speculative_load_dangerous allows speculative motion of more
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load insns. */
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extern int flag_schedule_interblock;
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extern int flag_schedule_speculative;
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extern int flag_schedule_speculative_load;
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extern int flag_schedule_speculative_load_dangerous;
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/* flag_on_branch_count_reg means try to replace add-1,compare,branch tupple
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by a cheaper branch, on a count register. */
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extern int flag_branch_on_count_reg;
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#endif /* HAIFA */
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/* Nonzero means put things in delayed-branch slots if supported. */
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extern int flag_delayed_branch;
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/* Nonzero means pretend it is OK to examine bits of target floats,
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even if that isn't true. The resulting code will have incorrect constants,
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but the same series of instructions that the native compiler would make. */
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extern int flag_pretend_float;
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/* Nonzero means change certain warnings into errors.
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Usually these are warnings about failure to conform to some standard. */
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extern int flag_pedantic_errors;
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/* Nonzero means generate position-independent code.
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This is not fully implemented yet. */
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extern int flag_pic;
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/* Nonzero means generate extra code for exception handling and enable
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exception handling. */
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extern int flag_exceptions;
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/* Nonzero means use the new model for exception handling. Replaces
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-DNEW_EH_MODEL as a compile option. */
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extern int flag_new_exceptions;
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/* Nonzero means don't place uninitialized global data in common storage
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by default. */
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extern int flag_no_common;
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/* -finhibit-size-directive inhibits output of .size for ELF.
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This is used only for compiling crtstuff.c,
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and it may be extended to other effects
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needed for crtstuff.c on other systems. */
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extern int flag_inhibit_size_directive;
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/* Nonzero means place each function into its own section on those platforms
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which support arbitrary section names and unlimited numbers of sections. */
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extern int flag_function_sections;
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/* -fverbose-asm causes extra commentary information to be produced in
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the generated assembly code (to make it more readable). This option
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is generally only of use to those who actually need to read the
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generated assembly code (perhaps while debugging the compiler itself).
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-fno-verbose-asm, the default, causes the extra information
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to not be added and is useful when comparing two assembler files. */
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extern int flag_verbose_asm;
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/* -dA causes debug information to be produced in
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the generated assembly code (to make it more readable). This option
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is generally only of use to those who actually need to read the
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generated assembly code (perhaps while debugging the compiler itself).
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Currently, this switch is only used by dwarfout.c; however, it is intended
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to be a catchall for printing debug information in the assembler file. */
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extern int flag_debug_asm;
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/* -fgnu-linker specifies use of the GNU linker for initializations.
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-fno-gnu-linker says that collect will be used. */
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extern int flag_gnu_linker;
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/* Tag all structures with __attribute__(packed) */
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extern int flag_pack_struct;
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/* This flag is only tested if alias checking is enabled.
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0 if pointer arguments may alias each other. True in C.
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1 if pointer arguments may not alias each other but may alias
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global variables.
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2 if pointer arguments may not alias each other and may not
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alias global variables. True in Fortran.
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The value is ignored if flag_alias_check is 0. */
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extern int flag_argument_noalias;
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/* Nonzero if we should do (language-dependent) alias analysis.
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Typically, this analysis will assume that expressions of certain
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types do not alias expressions of certain other types. Only used
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if alias analysis (in general) is enabled. */
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extern int flag_strict_aliasing;
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/* Emit code to check for stack overflow; also may cause large objects
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to be allocated dynamically. */
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extern int flag_stack_check;
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/* Do the full regmove optimization pass. */
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extern int flag_regmove;
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/* Other basic status info about current function. */
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/* Nonzero means current function must be given a frame pointer.
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Set in stmt.c if anything is allocated on the stack there.
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Set in reload1.c if anything is allocated on the stack there. */
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extern int frame_pointer_needed;
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/* Set nonzero if jump_optimize finds that control falls through
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at the end of the function. */
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extern int can_reach_end;
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/* Nonzero if function being compiled receives nonlocal gotos
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from nested functions. */
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extern int current_function_has_nonlocal_label;
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/* Nonzero if function being compiled has nonlocal gotos to parent
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function. */
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extern int current_function_has_nonlocal_goto;
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/* Nonzero if this function has a computed goto.
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It is computed during find_basic_blocks or during stupid life
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analysis. */
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extern int current_function_has_computed_jump;
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/* Nonzero if GCC must add code to check memory access (used by Checker). */
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extern int flag_check_memory_usage;
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/* Nonzero if GCC must prefix function names (used with
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flag_check_memory_usage). */
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extern int flag_prefix_function_name;
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/* Nonzero if the current function is a thunk, so we should try to cut
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corners where we can. */
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extern int current_function_is_thunk;
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/* Value of the -G xx switch, and whether it was passed or not. */
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extern int g_switch_value;
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extern int g_switch_set;
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