diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 115 |
1 files changed, 105 insertions, 10 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 3fe9d5f302c..94755949d65 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -216,6 +216,8 @@ Objective-C and Objective-C++ Dialects}. -fobjc-gc @gol -fobjc-nilcheck @gol -fobjc-std=objc1 @gol +-fno-local-ivars @gol +-fivar-visibility=@var{public|protected|private|package} @gol -freplace-objc-classes @gol -fzero-link @gol -gen-decls @gol @@ -262,7 +264,7 @@ Objective-C and Objective-C++ Dialects}. -Wparentheses -Wpedantic-ms-format -Wno-pedantic-ms-format @gol -Wpointer-arith -Wno-pointer-to-int-cast @gol -Wredundant-decls -Wno-return-local-addr @gol --Wreturn-type -Wsequence-point -Wshadow @gol +-Wreturn-type -Wsequence-point -Wshadow -Wno-shadow-ivar @gol -Wsign-compare -Wsign-conversion -Wfloat-conversion @gol -Wsizeof-pointer-memaccess @gol -Wstack-protector -Wstack-usage=@var{len} -Wstrict-aliasing @gol @@ -427,8 +429,8 @@ Objective-C and Objective-C++ Dialects}. -ftree-vectorize -ftree-vrp @gol -funit-at-a-time -funroll-all-loops -funroll-loops @gol -funsafe-loop-optimizations -funsafe-math-optimizations -funswitch-loops @gol --fvariable-expansion-in-unroller -fvect-cost-model -fvpt -fweb @gol --fwhole-program -fwpa -fuse-ld=@var{linker} -fuse-linker-plugin @gol +-fuse-caller-save -fvariable-expansion-in-unroller -fvect-cost-model -fvpt @gol +-fweb -fwhole-program -fwpa -fuse-ld=@var{linker} -fuse-linker-plugin @gol --param @var{name}=@var{value} -O -O0 -O1 -O2 -O3 -Os -Ofast -Og} @@ -670,6 +672,7 @@ Objective-C and Objective-C++ Dialects}. -mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -msse4 -mavx @gol -mavx2 -mavx512f -mavx512pf -mavx512er -mavx512cd -msha @gol -maes -mpclmul -mfsgsbase -mrdrnd -mf16c -mfma -mprefetchwt1 @gol +-mclflushopt -mxsavec -mxsaves @gol -msse4a -m3dnow -mpopcnt -mabm -mbmi -mtbm -mfma4 -mxop -mlzcnt @gol -mbmi2 -mfxsr -mxsave -mxsaveopt -mrtm -mlwp -mthreads @gol -mno-align-stringops -minline-all-stringops @gol @@ -870,7 +873,7 @@ Objective-C and Objective-C++ Dialects}. See RS/6000 and PowerPC Options. @emph{RL78 Options} -@gccoptlist{-msim -mmul=none -mmul=g13 -mmul=rl78} +@gccoptlist{-msim -mmul=none -mmul=g13 -mmul=rl78 -m64bit-doubles -m32bit-doubles} @emph{RS/6000 and PowerPC Options} @gccoptlist{-mcpu=@var{cpu-type} @gol @@ -980,7 +983,7 @@ See RS/6000 and PowerPC Options. -mpretend-cmove -mtas} @emph{Solaris 2 Options} -@gccoptlist{-mimpure-text -mno-impure-text @gol +@gccoptlist{-mclear-hwcap -mno-clear-hwcap -mimpure-text -mno-impure-text @gol -pthreads -pthread} @emph{SPARC Options} @@ -2977,6 +2980,22 @@ for individual class implementations to be modified during program execution. The GNU runtime currently always retains calls to @code{objc_get_class("@dots{}")} regardless of command-line options. +@item -fno-local-ivars +@opindex fno-local-ivars +@opindex flocal-ivars +By default instance variables in Objective-C can be accessed as if +they were local variables from within the methods of the class they're +declared in. This can lead to shadowing between instance variables +and other variables declared either locally inside a class method or +globally with the same name. Specifying the @option{-fno-local-ivars} +flag disables this behavior thus avoiding variable shadowing issues. + +@item -fivar-visibility=@var{public|protected|private|package} +@opindex fivar-visibility +Set the default instance variable visibility to the specified option +so that instance variables declared outside the scope of any access +modifier directives default to the specified visibility. + @item -gen-decls @opindex gen-decls Dump interface declarations for all classes seen in the source file to a @@ -4360,10 +4379,17 @@ Do not warn whenever an @samp{#else} or an @samp{#endif} are followed by text. @item -Wshadow @opindex Wshadow @opindex Wno-shadow -Warn whenever a local variable or type declaration shadows another variable, -parameter, type, or class member (in C++), or whenever a built-in function -is shadowed. Note that in C++, the compiler warns if a local variable -shadows an explicit typedef, but not if it shadows a struct/class/enum. +Warn whenever a local variable or type declaration shadows another +variable, parameter, type, class member (in C++), or instance variable +(in Objective-C) or whenever a built-in function is shadowed. Note +that in C++, the compiler warns if a local variable shadows an +explicit typedef, but not if it shadows a struct/class/enum. + +@item -Wno-shadow-ivar @r{(Objective-C only)} +@opindex Wno-shadow-ivar +@opindex Wshadow-ivar +Do not warn whenever a local variable shadows an instance variable in an +Objective-C method. @item -Wlarger-than=@var{len} @opindex Wlarger-than=@var{len} @@ -5401,6 +5427,13 @@ Detect floating-point division by zero. Unlike other similar options, @option{-fsanitize=undefined}, since floating-point division by zero can be a legitimate way of obtaining infinities and NaNs. +@item -fsanitize=float-cast-overflow +@opindex fsanitize=float-cast-overflow + +This option enables floating-point type to integer conversion checking. +We check that the result of the conversion does not overflow. +This option does not work well with @code{FE_INVALID} exceptions enabled. + @item -fsanitize-recover @opindex fsanitize-recover By default @option{-fsanitize=undefined} sanitization (and its suboptions @@ -7437,7 +7470,8 @@ Attempt to remove redundant extension instructions. This is especially helpful for the x86-64 architecture, which implicitly zero-extends in 64-bit registers after writing to their lower 32-bit half. -Enabled for AArch64 and x86 at levels @option{-O2}, @option{-O3}. +Enabled for Alpha, AArch64 and x86 at levels @option{-O2}, +@option{-O3}, @option{-Os}. @item -flive-range-shrinkage @opindex flive-range-shrinkage @@ -7707,6 +7741,14 @@ and then tries to find ways to combine them. Enabled by default at @option{-O1} and higher. +@item -fuse-caller-save +Use caller save registers for allocation if those registers are not used by +any called function. In that case it is not necessary to save and restore +them around calls. This is only possible if called functions are part of +same compilation unit as current function and they are compiled before it. + +Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}. + @item -fconserve-stack @opindex fconserve-stack Attempt to minimize stack usage. The compiler attempts to use less @@ -8753,6 +8795,9 @@ as an algorithm disables partitioning and streaming completely. The default value is @code{balanced}. While @code{1to1} can be used as an workaround for various code ordering issues, the @code{max} partitioning is intended for internal testing only. +The value @code{one} specifies that exactly one partition should be +used while the value @code{none} bypasses partitioning and executes +the link-time optimization step directly from the WPA phase. @item -flto-compression-level=@var{n} This option specifies the level of compression used for intermediate @@ -10049,6 +10094,35 @@ parameter in order to propagate them and perform devirtualization. @option{ipa-cp-value-list-size} is the maximum number of values and types it stores per one formal parameter of a function. +@item ipa-cp-eval-threshold +IPA-CP calculates its own score of cloning profitability heuristics +and performs those cloning opportunities with scores that exceed +@option{ipa-cp-eval-threshold}. + +@item ipa-max-agg-items +IPA-CP is also capable to propagate a number of scalar values passed +in an aggregate. @option{ipa-max-agg-items} controls the maximum +number of such values per one parameter. + +@item ipa-cp-loop-hint-bonus +When IPA-CP determines that a cloning candidate would make the number +of iterations of a loop known, it adds a bonus of +@option{ipa-cp-loop-hint-bonus} bonus to the profitability score of +the candidate. + +@item ipa-cp-array-index-hint-bonus +When IPA-CP determines that a cloning candidate would make the index of +an array access known, it adds a bonus of +@option{ipa-cp-array-index-hint-bonus} bonus to the profitability +score of the candidate. + +@item ipa-max-aa-steps +During its analysis of function bodies, IPA-CP employs alias analysis +in order to track values pointed to by function parameters. In order +not spend too much time analyzing huge functions, it will give up and +consider all memory clobbered after examining +@option{ipa-max-aa-steps} statements modifying memory. + @item lto-partitions Specify desired number of partitions produced during WHOPR compilation. The number of partitions should exceed the number of CPUs used for compilation. @@ -15312,6 +15386,8 @@ preferred alignment to @option{-mpreferred-stack-boundary=2}. @itemx -mno-aes @itemx -mpclmul @itemx -mno-pclmul +@itemx -mclfushopt +@itemx -mno-clflsuhopt @need 800 @itemx -mfsgsbase @itemx -mno-fsgsbase @@ -15350,6 +15426,10 @@ preferred alignment to @option{-mpreferred-stack-boundary=2}. @itemx -mrtm @itemx -mtbm @itemx -mno-tbm +@itemx -mxsavec +@itemx -mno-xsavec +@itemx -mxsaves +@itemx -mno-xsaves @opindex mmmx @opindex mno-mmx @opindex msse @@ -18845,6 +18925,14 @@ The @code{g13} option is for the hardware multiply/divide peripheral only on the RL78/G13 targets. The @code{rl78} option is for the standard hardware multiplication defined in the RL78 software manual. +@item -m64bit-doubles +@itemx -m32bit-doubles +@opindex m64bit-doubles +@opindex m32bit-doubles +Make the @code{double} data type be 64 bits (@option{-m64bit-doubles}) +or 32 bits (@option{-m32bit-doubles}) in size. The default is +@option{-m32bit-doubles}. + @end table @node RS/6000 and PowerPC Options @@ -20860,6 +20948,13 @@ patterns. This can result in faster code on the SH4 processor. These @samp{-m} options are supported on Solaris 2: @table @gcctabopt +@item -mclear-hwcap +@opindex mclear-hwcap +@option{-mclear-hwcap} tells the compiler to remove the hardware +capabilities generated by the Solaris assembler. This is only necessary +when object files use ISA extensions not supported by the current +machine, but check at runtime whether or not to use them. + @item -mimpure-text @opindex mimpure-text @option{-mimpure-text}, used in addition to @option{-shared}, tells |