Common
Alias for --help=target
-;; The following three entries are to work around the gcc driver
+;; The following four entries are to work around the gcc driver
;; program's insatiable desire to turn options starting with a
;; double dash (--) into options starting with a dash f (-f).
fhelp
-Common
+Common Var(help_flag)
fhelp=
Common Joined
ftarget-help
Common
+fversion
+Common
+
-param
Common Separate
--param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
Optimize for space rather than speed
W
-Common RejectNegative
+Common RejectNegative Var(extra_warnings) Warning
This switch is deprecated; use -Wextra instead
Waggregate-return
Treat specified warning as error
Wextra
-Common Warning
+Common Var(extra_warnings) Warning
Print extra (possibly unwanted) warnings
Wfatal-errors
Common RejectNegative Joined UInteger Warning
-Wlarger-than=<number> Warn if an object is larger than <number> bytes
-Wlogical-op
-Common Warning Var(warn_logical_op)
-Warn when a logical operator is suspicously always evaluating to true or false
-
Wunsafe-loop-optimizations
Common Var(warn_unsafe_loop_optimizations) Warning
Warn if the loop cannot be optimized due to nontrivial assumptions.
Warn if a comparison is always true or always false due to the limited range of the data type
Wuninitialized
-Common Var(warn_uninitialized) Warning
+Common Var(warn_uninitialized) Init(-1) Warning
Warn about uninitialized automatic variables
Wunreachable-code
Common Var(flag_conserve_stack) Optimization
Do not perform optimizations increasing noticeably stack usage
+fcompare-debug=
+Common JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
+-fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
+
+fcompare-debug-second
+Common RejectNegative Var(flag_compare_debug)
+Run only the second compilation of -fcompare-debug
+
fcprop-registers
Common Report Var(flag_cprop_registers) Optimization
Perform a register copy-propagation optimization pass
When running CSE, follow jumps to their targets
fcse-skip-blocks
-Common Report Var(flag_cse_skip_blocks) Optimization
-When running CSE, follow conditional jumps
+Common
+Does nothing. Preserved for backward compatibility.
fcx-limited-range
Common Report Var(flag_cx_limited_range) Optimization
Common Joined RejectNegative
-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-noaddr
Common Report Var(flag_dump_noaddr)
Suppress output of addresses in debugging dumps
Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
Enable CFI tables via GAS assembler directives.
+fdump-unnumbered-links
+Common Report Var(flag_dump_unnumbered_links) VarExists
+Suppress output of previous and next insn numbers in debugging dumps
+
fearly-inlining
Common Report Var(flag_early_inlining) Init(1) Optimization
Perform early inlining
Common Report Var(flag_pie,1) VarExists
Generate position-independent code for executables if possible (small mode)
+fplugin=
+Common Joined RejectNegative
+Specify a plugin to load
+
+fplugin-arg-
+Common Joined RejectNegative
+-fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
+
fpredictive-commoning
Common Report Var(flag_predictive_commoning) Optimization
Run predictive commoning optimization.
Eliminate redundant sign extensions using LCM.
fshow-column
-Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(0)
-Show column numbers in diagnostics, when available. Default off
+Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
+Show column numbers in diagnostics, when available. Default on
fsignaling-nans
Common Report Var(flag_signaling_nans) Optimization
Common Report Var(flag_tree_dse) Optimization
Enable dead store elimination
+ftree-forwprop
+Common Report Var(flag_tree_forwprop) Init(1) Optimization
+Enable forward propagation on trees
+
ftree-fre
Common Report Var(flag_tree_fre) Optimization
Enable Full Redundancy Elimination (FRE) on trees
Common Report Joined UInteger Var(flag_tree_parallelize_loops) Init(1)
Enable automatic parallelization of loops
+ftree-phiprop
+Common Report Var(flag_tree_phiprop) Init(1) Optimization
+Enable hoisting loads from conditional pointers.
+
ftree-pre
Common Report Var(flag_tree_pre) Optimization
Enable SSA-PRE optimization on trees
+ftree-pta
+Common Report Var(flag_tree_pta) Init(1) Optimization
+Perform function-local points-to analysis on trees.
+
ftree-reassoc
Common Report Var(flag_tree_reassoc) Init(1) Optimization
Enable reassociation on tree level
Common Report Var(flag_tree_vectorize) Optimization
Enable loop vectorization on trees
+ftree-slp-vectorize
+Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
+Enable basic block vectorization (SLP) on trees
+
fvect-cost-model
Common Report Var(flag_vect_cost_model) Optimization
Enable use of cost model in vectorization
Generate debug information in default format
gcoff
-Common JoinedOrMissing Negative(gdwarf-2)
+Common JoinedOrMissing Negative(gdwarf-)
Generate debug information in COFF format
-gdwarf-2
-Common JoinedOrMissing Negative(gstabs)
-Generate debug information in DWARF v2 format
+gdwarf-
+Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
+Generate debug information in DWARF v2 (or later) format
ggdb
Common JoinedOrMissing
Common JoinedOrMissing Negative(gvms)
Generate debug information in extended STABS format
+gtoggle
+Common Report Var(flag_gtoggle)
+Toggle debug information generation
+
gvms
Common JoinedOrMissing Negative(gxcoff)
Generate debug information in VMS format
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