mbig-endian
Target Report RejectNegative Mask(BIG_ENDIAN)
Generate big endian code

mlittle-endian
Target Report RejectNegative InverseMask(BIG_ENDIAN)
Generate little endian code

mgnu-as
Target Report Mask(GNU_AS)
Generate code for GNU as

mgnu-ld
Target Report Mask(GNU_LD)
Generate code for GNU ld

mvolatile-asm-stop
Target Report Mask(VOL_ASM_STOP)
Emit stop bits before and after volatile extended asms

mregister-names
Target Mask(REG_NAMES)
Use in/loc/out register names

mno-sdata
Target Report RejectNegative Mask(NO_SDATA)

msdata
Target Report RejectNegative InverseMask(NO_SDATA)
Enable use of sdata/scommon/sbss

mno-pic
Target Report RejectNegative Mask(NO_PIC)
Generate code without GP reg

mconstant-gp
Target Report RejectNegative Mask(CONST_GP)
gp is constant (but save/restore gp on indirect calls)

mauto-pic
Target Report RejectNegative Mask(AUTO_PIC)
Generate self-relocatable code

minline-float-divide-min-latency
Target Report RejectNegative Var(TARGET_INLINE_FLOAT_DIV, 1)
Generate inline floating point division, optimize for latency

minline-float-divide-max-throughput
Target Report RejectNegative Var(TARGET_INLINE_FLOAT_DIV, 2) Init(2)
Generate inline floating point division, optimize for throughput

mno-inline-float-divide
Target Report RejectNegative Var(TARGET_INLINE_FLOAT_DIV, 0)

minline-int-divide-min-latency
Target Report RejectNegative Var(TARGET_INLINE_INT_DIV, 1)
Generate inline integer division, optimize for latency

minline-int-divide-max-throughput
Target Report RejectNegative Var(TARGET_INLINE_INT_DIV, 2)
Generate inline integer division, optimize for throughput

mno-inline-int-divide
Target Report RejectNegative Var(TARGET_INLINE_INT_DIV, 0)
Do not inline integer division

minline-sqrt-min-latency
Target Report RejectNegative Var(TARGET_INLINE_SQRT, 1)
Generate inline square root, optimize for latency

minline-sqrt-max-throughput
Target Report RejectNegative Var(TARGET_INLINE_SQRT, 2)
Generate inline square root, optimize for throughput

mno-inline-sqrt
Target Report RejectNegative Var(TARGET_INLINE_SQRT, 0)
Do not inline square root

mdwarf2-asm
Target Report Mask(DWARF2_ASM)
Enable Dwarf 2 line debug info via GNU as

mearly-stop-bits
Target Report Mask(EARLY_STOP_BITS)
Enable earlier placing stop bits for better scheduling

mfixed-range=
Target RejectNegative Joined
Specify range of registers to make fixed

mtls-size=
Target RejectNegative Joined UInteger Var(ia64_tls_size) Init(22)
Specify bit size of immediate TLS offsets

mtune=
Target RejectNegative Joined
Schedule code for given CPU