Warn about code that will never be executed
Wunused
-Common Warning
+Common Var(warn_unused) Init(0) Warning
Enable all -Wunused- warnings
Wunused-function
-Common Var(warn_unused_function) Warning
+Common Var(warn_unused_function) Init(-1) Warning
Warn when a function is unused
Wunused-label
-Common Var(warn_unused_label) Warning
+Common Var(warn_unused_label) Init(-1) Warning
Warn when a label is unused
Wunused-parameter
-Common Var(warn_unused_parameter) Warning
+Common Var(warn_unused_parameter) Init(-1) Warning
Warn when a function parameter is unused
Wunused-value
-Common Var(warn_unused_value) Warning
+Common Var(warn_unused_value) Init(-1) Warning
Warn when an expression value is unused
Wunused-variable
-Common Var(warn_unused_variable) Warning
+Common Var(warn_unused_variable) Init(-1) Warning
Warn when a variable is unused
Wcoverage-mismatch
Common Report Var(flag_no_common,0) Optimization
Do not put uninitialized globals in the common section
+fconserve-stack
+Common Var(flag_conserve_stack,0) Optimization
+Do not perform optimizations increasing noticeably stack usage
+
fcprop-registers
Common Report Var(flag_cprop_registers) Optimization
Perform a register copy-propagation optimization pass
Common Report Var(flag_dump_unnumbered) VarExists
Suppress output of instruction numbers, line number notes and addresses in debugging dumps
+fdwarf2-cfi-asm
+Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
+Enable CFI tables via GAS assembler directives.
+
fearly-inlining
Common Report Var(flag_early_inlining) Init(1) Optimization
Perform early inlining
Perform global common subexpression elimination after register allocation
has finished
+fgraphite
+Common Report Var(flag_graphite)
+Enable in and out of Graphite representation
+
+floop-strip-mine
+Common Report Var(flag_loop_strip_mine) Optimization
+Enable Loop Strip Mining transformation
+
+floop-interchange
+Common Report Var(flag_loop_interchange) Optimization
+Enable Loop Interchange transformation
+
+floop-block
+Common Report Var(flag_loop_block) Optimization
+Enable Loop Blocking transformation
+
+fgraphite-identity
+Common Report Var(flag_graphite_identity) Optimization
+Enable Graphite Identity transformation
+
fguess-branch-probability
Common Report Var(flag_guess_branch_prob) Optimization
Enable guessing of branch probabilities
; only when actually used. Used in conjunction with -g. Also
; does the right thing with #pragma interface.
finline
-Common Report Var(flag_no_inline,0) Init(2)
+Common Report Var(flag_no_inline,0) Init(0)
Pay attention to the \"inline\" keyword
finline-small-functions
Common Report Var(flag_ipa_cp) Optimization
Perform Interprocedural constant propagation
+fipa-cp-clone
+Common Report Var(flag_ipa_cp_clone) Optimization
+Perform cloning to make Interprocedural constant propagation stronger
+
fipa-pure-const
Common Report Var(flag_ipa_pure_const) Init(0) Optimization
Discover pure and const functions
Perform structure layout optimizations based
on profiling information.
+fira
+Common Report Var(flag_ira) Init(0)
+Use integrated register allocator.
+
+fira-algorithm=
+Common Joined RejectNegative
+-fira-algorithm=[regional|CB|mixed] Set the used IRA algorithm
+
+fira-coalesce
+Common Report Var(flag_ira_coalesce) Init(0)
+Do optimistic coalescing.
+
+fira-share-save-slots
+Common Report Var(flag_ira_share_save_slots) Init(1)
+Share slots for saving different hard registers.
+
+fira-share-spill-slots
+Common Report Var(flag_ira_share_spill_slots) Init(1)
+Share stack slots for spilled pseudo-registers.
+
+fira-verbose=
+Common RejectNegative Joined UInteger
+-fira-verbose=<number> Control IRA's level of diagnostic messages.
+
fivopts
Common Report Var(flag_ivopts) Init(1) Optimization
Optimize induction variables on trees
Set the top-level directory for storing the profile data.
The default is 'pwd'.
+fprofile-correction
+Common Report Var(flag_profile_correction)
+Enable correction of flow inconsistent profile data input
+
fprofile-generate
Common
Enable common options for generating profile info for profile feedback directed optimizations
Common Report Var(flag_schedule_insns_after_reload) Optimization
Reschedule instructions after register allocation
+; This flag should be on when a target implements non-trivial
+; scheduling hooks, maybe saving some information for its own sake.
+; On IA64, for example, this is used for correct bundling.
+fselective-scheduling
+Common Report Var(flag_selective_scheduling) Optimization
+Schedule instructions using selective scheduling algorithm
+
+fselective-scheduling2
+Common Report Var(flag_selective_scheduling2) Optimization
+Run selective scheduling after reload
+
+fsel-sched-pipelining
+Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
+Perform software pipelining of inner loops during selective scheduling
+
+fsel-sched-pipelining-outer-loops
+Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
+Perform software pipelining of outer loops during selective scheduling
+
+fsel-sched-reschedule-pipelined
+Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
+Reschedule pipelined regions without pipelining
+
; sched_stalled_insns means that insns can be moved prematurely from the queue
; of stalled insns into the ready list.
fsched-stalled-insns
Common Report Var(flag_variable_expansion_in_unroller) Optimization
Apply variable expansion when loops are unrolled
-; Emit code to probe the stack, to help detect stack overflow; also
-; may cause large objects to be allocated dynamically.
+fstack-check=
+Common Report RejectNegative Joined
+-fstack-check=[no|generic|specific] Insert stack checking code into the program
+
fstack-check
-Common Report Var(flag_stack_check)
-Insert stack checking code into the program
+Common Report
+Insert stack checking code into the program. Same as -fstack-check=specific
fstack-limit
Common
Enable SSA-CCP optimization on trees
ftree-store-ccp
-Common Report Var(flag_tree_store_ccp) Optimization
-Enable SSA-CCP optimization for stores and loads
+Common
+Does nothing. Preserved for backward compatibility.
ftree-ch
Common Report Var(flag_tree_ch) Optimization
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