Mapping of options

The topic provides a mapping of classic IBM® XL C/C++ compiler options and Clang options that have the same or similar functions. 

Note: Suboptions of these options do not necessarily have a one-to-one mapping.

Table 1. Mapping of compiler options

Classic options supported by IBM XL C/C++ for AIX® 16.1.0	Similar/equivalent Clang options supported by IBM Open XL C/C++ for AIX 17.1.1
-#	-###
-+	-x c++
-C!	None; the default compiler behavior is as if -C! was in effect.
-E	-E or -E -x c for files with unrecognized file name suffixes
-f	-Wl,-f
-F	None
-G	-shared -Wl,-G Refer to Linking a shared Library with runtime linking for more information.
-ma	None
-O	-O0, -O1, -O2, -O3, or -Ofast
-p	None
-pg	None
-P	-E -P -o file.i obtains behavior similar to the classic -P option.
-q32	-m32
-q64	-m64
-qaggrcopy	None; the default compiler behavior is as if -qaggrcopy was in effect.
-qalias=[no]ansi	-f[no-]strict-aliasing
-qalias=suboption, where suboption is not [no]ansi	None
-qalign=bit_packed	-fpack-struct
-qalignrulefor	None
-qalloca	None
-q[no]altivec	-m[no-]altivec
-qarch	-mcpu
-qasm	-fasm
-qasm_as	None
-qassert	None
-qattr	None
-qbitfields=signed	-fsigned-bitfields
-qbitfields=unsigned	None
-qc_stdinc	-isystem
-qcpp_stdinc	-isystem
-qcache	None
-qchars=signed	-fsigned-char
-qchars=unsigned	-funsigned-char
-qcheck=bounds	-fsanitize=bounds -fsanitize-trap=bounds
-qcheck=divzero	-fsanitize=integer-divide-by-zero -fsanitize-trap=integer-divide-by-zero
-qcheck=nullptr	-fsanitize=null -fsanitize-trap=null
-qcinc	None
-qcommon	None
-qcompact	-Os and -Oz
-qconcurrentupdate	None
-qcpluscmt	None; the default compiler behavior is as if -qcpluscmt was in effect.
-qcrt	None; the default compiler behavior is as if -qcrt was in effect.
-qnocrt	-nostartfiles
-qdataimported	-mdataimported
-qdatalocal	-mdatalocal
-qnodatalocal	-mdataimported
-qdbcs	None; the compiler supports UTF-8 source files all the time.
-qdbgfmt=dwarf	-gdwarf-3
-qdbgfmt=dwarf4	-gdwarf-4
-qdbgfmt=stabstring	None
-qdbxextra	-fno-eliminate-unused-debug-types
-qdfp	None
-q[no]digraph	-f[no-]digraphs
-qdirectstorage	None
-qdollar	-fdollars-in-identifiers
-qdpcl	None
-qdump_class_hierarchy	-fdump-class-hierarchy or -Xclang -fdump-record-layouts
-qeh	-fexceptions
-qnoeh	-fignore-exceptions
-qenum	None
-qexpfile	None
-qextchk	None
-qfdpr	None
-qflag	None
-qfloat=[no]dfpemulate	None
-qfloat=[no]fenv	None
-qfloat=[no]fltint	None
-qfloat=[no]fold	None
-qfloat=[no]hscmplx	None
-qfloat=[no]hsflt	None
-qfloat=[no]hssngl	None
-qfloat=maf	-ffp-contract=fast
-qfloat=nomaf	-ffp-contract=off
-qfloat=[no]nans	None
-qfloat=relax	-fno-honor-nans -fno-honor-infinities -fdenormal-fp-math=positive-zero -fno-signed-zeros -fno-rounding-math -freciprocal-math
-qfloat=norelax	-fhonor-nans -fhonor-infinities -fdenormal-fp-math=ieee -fsigned-zeros -frounding-math -fno-reciprocal-math
-qfloat=[no]rndsngl	None
-qfloat=[no]rngchk	None
-qfloat=[no]rrm	-f[no-]rounding-math
-qfloat=[no]rsqrt	None
-qfloat=[no]single	None
-qfloat=[no]spnans	None
-qfloat=[no]subnormals	None
-qflttrap=enable:inexact	None
-qflttrap=enable:invalid	None
-qflttrap=enable:overflow	None
-qflttrap=enable:underflow	None
-qflttrap=enable:zerodivide	-fsanitize=float-divide-by-zero -fsanitize-trap=float-divide-by-zero
-qflttrap=imprecise	None
-qflttrap=nanq	None
-qformat	-Wformat
-qfullpath	None; the default compiler behavior is as if -qfullpath was in effect.
-q[no]funcsect	-f[no-]function-sections
-qfunctrace	None
-qgcc_c_stdinc	None
-qgcc_cpp_stdinc	None
-qgenproto	None
-qhalt=w	-Werror
-qhaltonmsg	None
-qheapdebug	None
-qhelp	-help
-qhot	-Ofast
-qhot=suboption	None
-qidirfirst	None
-qignerrno	-fno-math-errno
-qignprag	None
-qinclude	-include
-qinfo=[no]unset	-W[no-]uninitialized
-qinfo=suboption, where suboption is not [no]unset	None
-qinitauto	None
-qinlglue	None; the default compiler behavior is as if -qnoinlglue was in effect.
-q[no]inline	-f[no-]inline
-qinline=auto	-finline-functions
-qinline=noauto	-finline-hint-functions
-qinline=level=1	-mllvm --inline-threshold=45 -mllvm --inlinehint-threshold=325
-qinline=level=2	-mllvm --inline-threshold=90 -mllvm --inlinehint-threshold=325
-qinline=level=3	-mllvm --inline-threshold=135 -mllvm --inlinehint-threshold=325
-qinline=level=4	-mllvm --inline-threshold=180 -mllvm --inlinehint-threshold=325
-qinline=level=5	-mllvm --inline-threshold=225 -mllvm --inlinehint-threshold=325
-qinline=level=6	-mllvm --inline-threshold=270 -mllvm --inlinehint-threshold=395
-qinline=level=7	-mllvm --inline-threshold=315 -mllvm --inlinehint-threshold=465
-qinline=level=8	-mllvm --inline-threshold=360 -mllvm --inlinehint-threshold=535
-qinline=level=9	-mllvm --inline-threshold=405 -mllvm --inlinehint-threshold=605
-qinline=level=10	-mllvm --inline-threshold=450 -mllvm --inlinehint-threshold=650
-qipa	-flto
-qisolated_call	None
-qkeepinlines	None
-qkeepparm	None
-qkeyword	None
-qlanglvl=stdc89	-std=c89 | c90
-qlanglvl=extc89	-std=gnu89 | gnu90
-qlanglvl=stdc99	-std=c99
-qlanglvl=extc99	-std=gnu99
-qlanglvl=stdc11	-std=c11
-qlanglvl=extc1x	-std=gnu11
-qlanglvl=extended	-std=gnu89
-qlanglvl=strict98	-std=c++98/c++03
-qlanglvl=extended	-std=gnu++98 | gnu++03
-qlanglvl=extended0x	-std=c++0x | gnu++11 | gnu++0x
-qlanglvl=extended1y	-std=gnu++1y | gnu++14
-qlanglvl=[no]gnu_warning	-W[no-]#warnings
-qlargepage	None
-qldbl128	None
-qlongdouble	None
-qnolib	-nodefaultlibs
-qnolibansi	-fno-builtin
-qlibmpi	None; the default compiler behavior is as if -qnolibmpi was in effect.
-qlinedebug	-g1 or -gline-tables-only
-qlist	-S
-qlistfmt	None
-qlistopt	None
-qlonglit	None
-qlonglong	None; the default compiler behavior is as if -qlonglong was in effect.
-qmacpstr	-fpascal-strings
-qmakedep	None
-qmaxerr	-ferror-limit
-qmaxmem	None
-qmbcs	None; the compiler supports UTF-8 source files all the time.
-qminimaltoc	None
-qmkshrobj	-shared Refer to Linking shared libraries for more information.
-qmkshrobj=priority	-bcdtors::priority: Refer to Linking shared libraries for more information.
-qnamemangling	None
-qobjmodel	None
-qoldpassbyvalue	None
-qoptdebug	None
-qoptfile	@file
-qoptimize	--optimize
-qpack_semantic=gnu	-fno-xl-pragma-pack
-qpack_semantic=ibm	-fxl-pragma-pack
-qpagesize	None
-qpath	None
-qpdf1	-fprofile-generate
-qpdf2	-fprofile-use
-qphsinfo	-ftime-report
-qpic=small	-fpic
-qpic=large	-fpic -mcmodel=large -Wl,-bbigtoc
-qppline	None
-qnoppline	-E -P
-qprefetch	None
-qprint	None
-qpriority	None
-qprocimported	None
-qproclocal	None
-qprocunknown	None
-qprofile	None
-qproto	None; the default compiler behavior is as if -qnoproto was in effect.
-qreport	None
-qreserved_reg	None
-qrestrict	-frestrict-args
-qro	None; the default compiler behavior is as if -qro was in effect.
-qroconst	None; the default compiler behavior is as if -qroconst was in effect.
-qroptr	None; the default compiler behavior is as if -qnoroptr was in effect.
-q[no]rtti	-f[no-]rtti
-qsaveopt	None
-qshowinc	None
-qshowmacros	-dM
-qshowpdf	None
-qsimd=noauto	-fno-vectorize -fno-slp-vectorize
-qskipsrc	None
-qslmtags	None
-qsmallstack	None
-qsmp	None
-qsource	None
-qsourcetype	-x
-qsourcetype=default	-x none
-qspeculateabsolutes	None
-qspill	None
-q[no]srcmsg	-f[no-]caret-diagnostics
-qstackprotect	-fstack-protector
-qstaticinline	None
-qstaticlink	None
-qstatsym	None
-qstdinc	-nostdinc
-qnostdinc	-nostdinc++
-qstrict=association	-fno-associative-math
-qstrict=noassociation	-fassociative-math
-qstrict=[no]nans	-f[no-]honor-nans
-qstrict=[no]infinities	-f[no-]honor-infinities
-qstrict=[no]zerosigns	-f[no-]signed-zeros
-qstrict=subnormals	-fdenormal-fp-math=ieee
-qstrict=nosubnormals	-fdenormal-fp-math=positive-zero or -fdenormal-fp-math=preserve-sign
-qstrict=operationprecision	-fno-reciprocal-math
-qstrict=nooperationprecision	-freciprocal-math
-qstrict=[no]vectorprecision	None
-qstrict=[no]reductionorder	None
-qstrict=[no]guards	None
-qstrict=[no]library	None
-qstrict=order	-fno-associative-math
-qstrict=noorder	-fassociative-math
-qstrict=ieeefp	-fhonor-nans -fhonor-infinities -fdenormal-fp-math=ieee -fsigned-zeros -frounding-math -fno-reciprocal-math
-qstrict=noieeefp	-fno-honor-nans -fno-honor-infinities -fdenormal-fp-math=positive-zero -fno-signed-zeros -fno-rounding-math -freciprocal-math
-qstrict=exceptions	-fhonor-nans -fhonor-infinities -fdenormal-fp-math=ieee -ffp-exception-behavior=strict
-qstrict=noexceptions	-fno-honor-nans -fno-honor-infinities -fdenormal-fp-math=positive-zero -ffp-exception-behavior=ignore
-qstrict=precision	-fno-associative-math -fdenormal-fp-math=ieee -fno-reciprocal-math
-qstrict=noprecision	-fassociative-math -fdenormal-fp-math=positive-zero -freciprocal-math
-qstrict_induction	None
-qsuppress	None
-qsymtab	None
-qsyntaxonly	-fsyntax-only
-qtabsize	None
-qtbtable	None; the default compiler behavior is as if -qtbtable=full was in effect.
-qtempinc	None
-qtemplatedepth	-ftemplate-depth
-qtemplaterecompile	None
-qtemplateregistry	None
-qtempmax	None
-qthreaded	-pthread
-qtimestamps	None
-qtls	-ftls-model
-qtmplinst	None
-qtmplparse	None
-qtocdata	None
-qtocmerge	None
-qtrigraph	-trigraphs
-qtune	None
-qtwolink	-bcdtors:mbr
-qunique	None
-q[no]unroll	-f[no-]unroll-loops
-qunroll=yes	None
-qunwind	None
-qupconv	None; the default compiler behavior is as if -qnoupconv was in effect.
-qutf	None
-qvecnvol	-mabi=vec-extabi
-qnovecnvol	-mabi=default
-qversion	--version
-qvisibility	-fvisibility; see also -fvisibility-inlines-hidden.
-qvrsave	None; the default compiler behavior is as if -qnovrsave was in effect.
-qwarn0x	None
-qwarn64	None
-qweakexp	None
-qweaksymbol	None; the default compiler behavior is as if -qweaksymbol was in effect.
-qxcall	None
-qxlcompatmacros	None
-qxref	None
-s	-Wl,-s
-t	None
-v	-v
-V	-v
-y	None
-Z	-Wl,-Z