Variable
int target_flags
+Variable
+int optimize
+
+Variable
+int optimize_size
+
+; 0 means straightforward implementation of complex divide acceptable.
+; 1 means wide ranges of inputs must work for complex divide.
+; 2 means C99-like requirements for complex multiply and divide.
+Variable
+int flag_complex_method = 1
+
+; Nonzero if subexpressions must be evaluated from left-to-right.
+Variable
+int flag_evaluation_order = 0
+
+; Set the default region and algorithm for the integrated register
+; allocator.
+
+Variable
+enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB
+
+Variable
+enum ira_region flag_ira_region = IRA_REGION_MIXED
+
+; Language specific warning pass for unused results.
+Variable
+bool flag_warn_unused_result = false
+
+Variable
+int *param_values
+
+; Floating-point contraction mode, fast by default.
+Variable
+enum fp_contract_mode flag_fp_contract_mode = FP_CONTRACT_FAST
+
+; The excess precision specified on the command line, or defaulted by
+; the front end.
+Variable
+enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT
+
+; Nonzero if we should write GIMPLE bytecode for link-time optimization.
+Variable
+int flag_generate_lto
+
+; True to warn about any objects definitions whose size is larger
+; than N bytes. Also want about function definitions whose returned
+; values are larger than N bytes, where N is 'larger_than_size'.
+Variable
+bool warn_larger_than
+
+Variable
+HOST_WIDE_INT larger_than_size
+
+; True to warn about any function whose frame size is larger
+; than N bytes.
+Variable
+bool warn_frame_larger_than
+
+Variable
+HOST_WIDE_INT frame_larger_than_size
+
+; Nonzero means we should be saving declaration info into a .X file.
+Variable
+int flag_gen_aux_info = 0
+
+; Nonzero if we are compiling code for a shared library, zero for
+; executable.
+Variable
+int flag_shlib
+
+; The default visibility for all symbols (unless overridden).
+Variable
+enum symbol_visibility default_visibility = VISIBILITY_DEFAULT
+
+; Set to the default thread-local storage (tls) model to use.
+Variable
+enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC
+
+; These two are really VEC(char_p,heap) *.
+
+Variable
+void *flag_instrument_functions_exclude_functions
+
+Variable
+void *flag_instrument_functions_exclude_files
+
+; Generic structs (e.g. templates not explicitly specialized)
+; may not have a compilation unit associated with them, and so
+; may need to be treated differently from ordinary structs.
+;
+; Structs only handled by reference (indirectly), will also usually
+; not need as much debugging information.
+
+Variable
+enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
+
+Variable
+enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
+
###
Driver
Common Optimization
Optimize for speed disregarding exact standards compliance
+R
+Driver Joined Separate
+
S
Driver
+T
+Driver Joined Separate
+
+Tbss
+Driver Separate
+
+Tdata
+Driver Separate
+
+Ttext
+Driver Separate
+
W
Common RejectNegative Warning Alias(Wextra)
This switch is deprecated; use -Wextra instead
Driver Separate
aux-info
-Common Separate
+Common Separate Var(aux_info_file_name)
-aux-info <file> Emit declaration information into <file>
aux-info=
Common Joined Alias(aux-info)
auxbase
-Common Separate RejectDriver
+Common Separate RejectDriver Var(aux_base_name)
auxbase-strip
Common Separate RejectDriver
-d<letters> Enable dumps from specific passes of the compiler
dumpbase
-Common Separate
+Common Separate Var(dump_base_name)
-dumpbase <file> Set the file basename to be used for dumps
dumpdir
-Common Separate
+Common Separate Var(dump_dir_name)
-dumpdir <dir> Set the directory name to be used for dumps
dumpmachine
Align the start of functions
falign-functions=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(align_functions)
falign-jumps
Common Report Var(align_jumps,0) Optimization UInteger
Align labels which are only reached by jumping
falign-jumps=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(align_jumps)
falign-labels
Common Report Var(align_labels,0) Optimization UInteger
Align all labels
falign-labels=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(align_labels)
falign-loops
-Common Report Var(align_loops) Optimization UInteger
+Common Report Var(align_loops,0) Optimization UInteger
Align the start of loops
falign-loops=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(align_loops)
fargument-alias
Common Ignore
Restrict target load migration not to re-use registers in any basic block
fcall-saved-
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-fcall-saved-<register> Mark <register> as being preserved across functions
fcall-used-
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-fcall-used-<register> Mark <register> as being corrupted by function calls
; Nonzero for -fcaller-saves: allocate values in regs that need to
Common Report Var(flag_check_data_deps)
Compare the results of several data dependence analyzers.
+fcombine-stack-adjustments
+Common Report Var(flag_combine_stack_adjustments) Optimization
+Looks for opportunities to reduce stack adjustments and stack references.
+
fcommon
Common Report Var(flag_no_common,0) Optimization
Do not put uninitialized globals in the common section
Amend appropriate diagnostic messages with the command line option that controls them
fdump-
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-fdump-<type> Dump various compiler internals to a file
fdump-final-insns
Common RejectNegative Joined Var(flag_dump_final_insns)
-fdump-final-insns=filename Dump to filename the insns at the end of translation
+fdump-go-spec=
+Common RejectNegative Joined Var(flag_dump_go_spec)
+-fdump-go-spec=filename Write all declarations to file as Go code
+
fdump-noaddr
Common Report Var(flag_dump_noaddr)
Suppress output of addresses in debugging dumps
Assume no NaNs or infinities are generated
ffixed-
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-ffixed-<register> Mark <register> as being unavailable to the compiler
ffloat-store
Common Report Var(flag_forward_propagate) Optimization
Perform a forward propagation pass on RTL
+ffp-contract=
+Common Joined RejectNegative
+-ffp-contract=[off|on|fast] Perform floating-point expression contraction.
+
; 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.
Common Report Var(flag_loop_block) Optimization
Enable Loop Blocking transformation
+floop-flatten
+Common Report Var(flag_loop_flatten) Optimization
+Enable Loop Flattening transformation
+
fstrict-volatile-bitfields
Common Report Var(flag_strict_volatile_bitfields) Init(-1)
Force bitfield accesses to match their type width
Common Joined RejectNegative
-fira-region=[one|all|mixed] Set regions for IRA
-fira-coalesce
-Common Report Var(flag_ira_coalesce) Init(0)
-Do optimistic coalescing.
-
fira-loop-pressure
Common Report Var(flag_ira_loop_pressure)
Use IRA based register pressure calculation
Does nothing. Preserved for backward compatibility.
flto
-Common Var(flag_lto)
+Common
Enable link-time optimization.
+flto=
+Common RejectNegative Joined Var(flag_lto)
+Link-time optimization with number of parallel jobs or jobserver.
+
+flto-partition=1to1
+Common Var(flag_lto_partition_1to1)
+Partition functions and vars at linktime based on object files they originate from
+
+flto-partition=balanced
+Common Var(flag_lto_partition_balanced)
+Partition functions and vars at linktime into approximately same sized buckets
+
+flto-partition=none
+Common Var(flag_lto_partition_none)
+Disable partioning and streaming
+
; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
flto-compression-level=
Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
Common Report Var(flag_errno_math) Init(1) Optimization
Set errno after built-in math functions
+fmax-errors=
+Common Joined RejectNegative UInteger Var(flag_max_errors)
+-fmax-errors=<number> Maximum number of errors to report
+
fmem-report
Common Report Var(mem_report)
Report on permanent memory allocation
Generate position-independent code for executables if possible (small mode)
fplugin=
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
Specify a plugin to load
fplugin-arg-
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
fpredictive-commoning
Reorder functions to improve code placement
frerun-cse-after-loop
-Common Report Var(flag_rerun_cse_after_loop) Init(2) Optimization
+Common Report Var(flag_rerun_cse_after_loop) Optimization
Add a common subexpression elimination pass after loop optimizations
frerun-loop-opt
Insert stack checking code into the program. Same as -fstack-check=specific
fstack-limit
-Common
+Common Var(common_deferred_options) Defer
fstack-limit-register=
-Common RejectNegative Joined
+Common RejectNegative Joined Var(common_deferred_options) Defer
-fstack-limit-register=<register> Trap if the stack goes past <register>
fstack-limit-symbol=
-Common RejectNegative Joined
+Common RejectNegative Joined Var(common_deferred_options) Defer
-fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
fstack-protector
Perform scalar replacement of aggregates
ftree-ter
-Common Report Var(flag_tree_ter) Init(1) Optimization
+Common Report Var(flag_tree_ter) Optimization
Replace temporary expressions in the SSA->normal pass
ftree-lrs
Common Report Var(flag_web) Init(2) Optimization
Construct webs and split unrelated uses of single variable
-fwhopr
-Common
-Enable partitioned link-time optimization
-
-fwhopr=
-Common RejectNegative Joined Var(flag_whopr)
-Partitioned link-time optimization with number of parallel jobs or jobserver.
-
ftree-builtin-call-dce
Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
Enable conditional dead code elimination for builtin calls
Common JoinedOrMissing Negative(gcoff)
Generate debug information in extended XCOFF format
+h
+Driver Joined Separate
+
iplugindir=
Common Joined Var(plugindir_string) Init(0)
-iplugindir=<dir> Set <dir> to be the default plugin directory
Driver
o
-Common Driver Joined Separate MissingArgError(missing filename after %qs)
+Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
-o <file> Place output into <file>
p
Issue warnings needed for strict compliance to the standard
pedantic-errors
-Common
+Common Var(flag_pedantic_errors)
Like -pedantic but issue them as errors
pg
; C option, but driver must not handle as "-u ndef".
v
-Driver
+Common Driver Var(verbose_flag)
+Enable verbose output
version
Common Var(version_flag) RejectDriver
Common RejectNegative Negative(shared)
Create a position independent executable
+z
+Driver Joined Separate
+
; This comment is to ensure we retain the blank line above.
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