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4024 alsontical constants across compilation units Attempt to merge identical debug strings across compilation units -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping Set default accessibility of module entities to PRIVATE. Perform SMS based modulo scheduling before the first scheduling pass Perform SMS based modulo scheduling with register moves allowed Move loop invariant computations out of loops Don't warn about uses of Microsoft extensions Generate code for NeXT (Apple Mac OS X) runtime environment Assume that receivers of Objective-C messages may be nil Enables the unlimited vectorizer cost model. Preserved for backward compatibility. Support synchronous non-call exceptions Treat a throw() exception specification as noexcept to improve code size Specify which ABI to use for Objective-C family code and meta-data generation. Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed Allow fast jumps to the message dispatcher Enable Objective-C exception and synchronization syntax Enable garbage collection (GC) in Objective-C/Objective-C++ programs Enable inline checks for nil receivers with the NeXT runtime and ABI version 2. Enable Objective-C setjmp exception handling runtime Conform to the Objective-C 1.0 language as implemented in GCC 4.0 When possible do not generate stack frames Enable OpenMP (implies -frecursive in Fortran) Enable OpenMP's SIMD directives Recognize C++ keywords like "compl" and "xor" Enable all optimization info dumps on stderr -fopt-info[-<type>=filename] Dump compiler optimization details Optimize sibling and tail recursive calls -foptimize-static-class-initialization Enable optimization of static class initialization code Enable string length optimizations on trees Try to lay out derived types as compactly as possible Pack structure members together without holes -fpack-struct=<number> Set initial maximum structure member alignment Return small aggregates in memory, not registers Look for and use PCH files even when preprocessing Limit non-const non-FP loop peeling under profile estimates of large code footprint Enable machine specific peephole optimizations Enable an RTL peephole pass before sched2 Downgrade conformance errors to warnings Generate position-independent code if possible (small mode) Generate position-independent code for executables if possible (small mode) Enable Plan 9 language extensions Use PLT for PIC calls (-fno-plt: load the address from GOT at call site) -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name> Report on memory allocation before interprocedural optimization Run predictive commoning optimization. Generate prefetch instructions, if available, for arrays in loops Treat the input file as already preprocessed -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments Enable basic program profiling code Insert arc-based program profiling code Enable correction of flow inconsistent profile data input Set the top-level directory for storing the profile data. The default is 'pwd'. Dump CFG profile for comparison. Enable common options for generating profile info for profile feedback directed optimizations fprofile-generate-atomic=[0..3] Atomically increments for profile counters. -fprofile-generate-buildinfo=filename Read build info to include in gcda file from filename Turn on instrumentation sampling with -fprofile-generate with rate set by --param profile-generate-sampling-rate or environment variable GCOV_SAMPLING_RATE Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir= Enable function reordering that improves code placement Report on consistency of profile Specify a substring to be stripped from the profile base file name Enable common options for performing profile feedback directed optimizations Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir= Insert code to profile values of expressions Protect parentheses in expressions -frandom-seed=<string> Make compile reproducible using <string> Enable range checking during compilation Interpret any REAL(4) as a REAL(10) Interpret any REAL(4) as a REAL(16) Interpret any REAL(4) as a REAL(8) Interpret any REAL(8) as a REAL(10) Interpret any REAL(8) as a REAL(16) Interpret any REAL(8) as a REAL(4) Reallocate the LHS in assignments Same as -fassociative-math for expressions which include division. -frecord-compilation-info-in-elf Record the compiler optimizations in a .gnu.switches.text section. Record gcc command line switches in the object file. Use a 4-byte record marker for unformatted files Use an 8-byte record marker for unformatted files Allocate local variables on the stack to allow indirect recursion Reduce the amount of reflection meta-data generated Turn on Redundant Extensions Elimination pass. Return small aggregates in registers Perform a register renaming optimization pass Reorder basic blocks to improve code placement -freorder-blocks-and-partition Reorder basic blocks and partition into hot and cold sections Reorder functions to improve code placement -freorder-functions=[callgraph] Select the scheme for function reordering. This invokes a linker plugin. Generate .gnu.callgraph.text sections listing callees and edge counts. Copy array sections into a contiguous block on procedure entry Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime Enable automatic template instantiation Functions which return values must end with return statements Add a common subexpression elimination pass after loop optimizations -freschedule-modulo-scheduled-loops Enable/Disable the traditional scheduling in loops that already passed modulo scheduling Perform Dynamic Inter-Procedural Analysis. Allow -g enablement for -fripa -fprofile-generate compiles. Don't import an auxiliary module if it contains asm statements Don't import an auxiliary module if the command line options mismatch with the primary module Substitute substring in include paths with a new string to allow reuse profile data -fripa-no-promote-always-inline-func Don't promote always inline static functions assuming they will be inlined and no copy is needed. Disable optimizations that assume default FP rounding behavior Generate run time type descriptor information Enable coverage-guided fuzzing code instrumentation. Inserts call to __sanitizer_cov_trace_pc into every basic block. -fsched-critical-path-heuristic Enable the critical path heuristic in the scheduler Enable the dependent count heuristic in the scheduler Enable the group heuristic in the scheduler Enable scheduling across basic blocks Enable the last instruction heuristic in the scheduler Enable register pressure sensitive insn scheduling Enable the rank heuristic in the scheduler Allow speculative motion of non-loads Enable the speculative instruction heuristic in the scheduler Allow speculative motion of some loads Allow speculative motion of more loads Allow premature scheduling of queued insns Set dependence distance checking in premature scheduling of queued insns -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled -fsched-verbose=<number> Set the verbosity level of the scheduler If scheduling post reload, do superblock scheduling Reschedule instructions before register allocation Reschedule instructions after register allocation Append a second underscore if the name already contains an underscore Access data in the same section from shared anchor points Perform software pipelining of inner loops during selective scheduling -fsel-sched-pipelining-outer-loops Perform software pipelining of outer loops during selective scheduling -fsel-sched-reschedule-pipelined Reschedule pipelined regions without pipelining Schedule instructions using selective scheduling algorithm Run selective scheduling after reload Use the same size for double as for float Use the narrowest integer type possible for enumeration types Force the underlying type for "wchar_t" to be "unsigned short" Show column numbers in diagnostics, when available. Default on Emit function prologues only before parts of the function that need it, rather than at the top of the function. Framepointer shrinkwrapping optimization. Apply negative sign to zero values Disable optimizations observable by IEEE signaling NaNs When "signed" or "unsigned" is not given make the bitfield signed Disable floating point optimizations that ignore the IEEE signedness of zero Specifies the vectorization cost model for code marked with a simd directive Convert floating point constants to single precision constants Support delete operator with objetc's size as the second parameter. Set the source language version Split lifetimes of induction variables when loops are unrolled Generate discontiguous stack frames Split wide types into independent registers Put all local arrays on stack. Insert stack checking code into the program. Same as -fstack-check=specific -fstack-check=[no|generic|specific] Insert stack checking code into the program -fstack-limit-register=<register> Trap if the stack goes past <register> -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name> Use propolice as a stack protection method Use a stack protection method for every function Use a smart stack protection method for certain functions -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables. Output stack usage information on a per-function basis Display statistics accumulated during compilation Enable assignability checks for stores into object arrays Assume strict aliasing rules apply Perform transformations based on enum precision Assume that values of enumeration type are always within the minimum range of that type Treat signed overflow as undefined Force bitfield accesses to match their type width Implement __atomic operations via libcalls to legacy __sync functions Check for syntax errors, then stop -ftabstop=<number> Distance between tab stops for column reporting Set the maximum number of template instantiation notes for a single warning or error -ftemplate-depth=<number> Specify maximum template instantiation depth Create data files needed by "gcov" Perform jump threading optimizations -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics Report the time taken by each compiler pass -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model Reorder top level functions, variables, and asms Perform superblock formation via tail duplication -ftrack-macro-expansion=<0|1|2> Track locations of tokens coming from macro expansion and display them in error messages Assume floating-point operations can trap Trap for signed overflow in addition, subtraction and multiplication Enable SSA-BIT-CCP optimization on trees Enable conditional dead code elimination for builtin calls Enable SSA-CCP optimization on trees Enable loop header copying on trees Enable coalescing of copy-related user variables that are inlined Enable coalescing of all copy-related user variables Enable copy propagation on trees Replace SSA temporaries with better names in copies Transform condition stores into unconditional ones Enable SSA dead code elimination optimization on trees Enable dominator optimizations Enable forward propagation on trees Enable Full Redundancy Elimination (FRE) on trees -ftree-loop-distribute-patterns Enable loop distribution for patterns transformed into a library call Enable loop distribution on trees Convert conditional jumps in innermost loops to branchless equivalents Also if-convert conditional jumps containing memory writes Enable loop invariant motion on trees Create canonical induction variables in loops Enable loop interchange transforms. Same as -floop-interchange Enable loop optimizations on tree level Enable loop vectorization on trees Perform live range splitting during the SSA->normal pass Enable automatic parallelization of loops In SSA-PRE optimization on trees, enable partial-partial redundancy elimination Enable hoisting loads from conditional pointers. Enable SSA-PRE optimization on trees Perform function-local points-to analysis on trees. Enable reassociation on tree level Enable copy propagation of scalar-evolution information. Enable SSA code sinking on trees Enable basic block vectorization (SLP) on trees Perform straight-line strength reduction Perform scalar replacement of aggregates Perform conversions of switch initializations. Replace temporary expressions in the SSA->normal pass Perform Value Range Propagation on trees When generating two-level line tables in DWARF (experimental), add linkage names for all functions (not just inlined functions). Use two-level line tables in DWARF (experimental). Append underscores to externally visible names Compile whole compilation unit at a time Perform loop unrolling for all loops Limit non-const non-FP loop unrolling under profile estimates of large code footprint Perform loop unrolling when iteration count is known Allow loop optimizations to assume that the loops behave in normal way Allow math optimizations that may violate IEEE or ISO standards When "signed" or "unsigned" is not given make the bitfield unsigned Make "char" unsigned by default Just generate unwind tables for exception handling Generate code for built-in atomic operations Generate code for the Boehm GC Use __cxa_atexit to register destructors Use __cxa_get_exception_ptr in exception handling Call a library routine to do integer divisions Use the bfd linker instead of the default linker Use the gold linker instead of the default linker Use the mcld linker instead of the default linker Perform variable tracking by annotating assignments -fvar-tracking-assignments-toggle Toggle -fvar-tracking-assignments Perform variable tracking and also
