Product Documentation
Abstract
XL C and XL C/C++ provides the gxlc and gxlc++ utilities to map many GCC compiler options to their XL C and XL C/C++ counterparts. Mappings currently recognized by XL C and XL C/C++ are listed in this document.
Content
The gxlc and gxlc++ utilities accept GNU C or C++ compiler options and translate them into comparable XL C or XL C/C++ options. Both utilities use the resulting XL C or XL C/C++ options to create an xlc or xlc++ invocation command, which they then use to invoke the compiler.
These utilities are provided to help you reuse make files created for applications previously developed with GNU C/C++. However, to fully exploit the capabilities of the compiler, we recommend that you use the standard XL C or XL C/C++ invocation commands and their associated options.
The actions of gxlc and gxlc++ are controlled by the gxlc.cfg configuration file. The GNU C/C++ options that have an XL C or XL C++ counterpart are shown in this file. Not every GNU option has a corresponding XL C or XL C/C++ option, and gxlc and gxlc++ will return warnings for input options that were not translated. You can modify the contents of the gxlc.cfg configuration file to meet your specific compilation requirements.
The gxlc and gxlc++ utilities will accept the following GNU C/C++ options and translate them to their corresponding XL C or XL C/C++ compiler options.
| GCC option | Mapping to xlc or xlc++ option |
| -### | -# |
 -ansi | -qlanglvl=extc89 -qnokeyword=inline -qnokeyword=typeof -qnokeyword=asm -qnocpluscmt -D__STRICT_ANSI__ |
| -B | -B |
| -C | -C |
| -c | -c |
| -Dmacro[=defn] | -Dmacro[=defn] |
| -dM | -qshowmacros |
| -dumpversion | -qversion |
| -E | -E |
| -e | -e |
 -fabi-version=n | -qabi_version=n |
| -fassociative-math | -qstrict=noassociation |
| -fconserve-stack | -qipa -qsmallstack |
| -fno-common | -qnocommon |
| -fdollars-in-identifiers | -qdollar |
 -fexceptions | -qeh |
| -ffast-math | -qignerrno -qnostrict -D__FAST_MATH__ |
| -ffixed-reg | -qreserved_reg=registry_list |
 -ffor-scope | -qlanglvl=ansifor |
 -fno-for-scope | -qlanglvl=noansifor |
| -ffunction-sections | -qfuncsect |
| -fgnu89-inline | -Dinline=__inline__ -D__inline=__inline__ -qnokeyword=__inline |
 -fno-implicit-inline-templates | -qtmplinst=noinlines |
 -fno-implicit-templates | -qtmplinst=none |
| -finline-functions | -qinline |
| -fkeep-inline-functions | -qkeepinlines |
| -finline | -qinline |
 -fno-gnu-keywords | -qnokeyword=typeof |
 -fno-operator-names | -qnokeyword=and -qnokeyword=bitand -qnokeyword=bitor -qnokeyword=compl -qnokeyword=not -qnokeyword=or -qnokeyword=xor |
| -fPIC | -qpic=large |
| -fpic | -qpic=small |
 -frtti | -qrtti |
| -freciprocal-math | -qfloat=hsflt |
| -fshort-enums | -qenum=small |
| -fsigned-bitfields | -qbitfields=signed |
| -fsigned-char | -qchars=signed |
| -fstrict-aliasing | -qalias=ansi |
| -fno-strict-aliasing | -qalias=noansi |
| -fsyntax-only | -qsyntaxonly |
| -fsigned-zeros | -qstrict=zerosigns |
| -fno-signed-zeros | -qstrict=nozerosigns |
 -ftemplate-depth-N | -qtemplatedepth=N |
| -ftls-model=model | -qtls=model |
| -funroll-all-loops | -qunroll=yes |
| -funroll-loops | -qunroll=yes |
| -funsigned-bitfields | -qbitfields=unsigned |
| -funsigned-char | -qchars=unsigned |
| -fvisibility=default | -qvisibility=default |
| -fvisibility=hidden | -qvisibility=hidden |
| -fvisibility=internal | -qvisibility=internal |
| -fvisibility=protected | -qvisibility=protected |
| -fwritable-strings | -qnoro |
| -g | -g |
| -g3 | -g |
| -ggdb | -g |
| -gdwarf | -g |
| -Idir | -Idir |
| -include file | -qinclude=file |
| -Ldir | -Ldir |
| -lgcc | -lgcc -lxl |
| -llibrary | -llibrary |
| -M | -qmakedep=gcc |
| -MD | -qmakedep=gcc |
| -MF * | -MF * |
| -m32 | -q32 |
| -m64 | -q64 |
| -maltivec | -qaltivec |
| -mcpu=970 | -qarch=ppc970 |
| -mcpu=power | -qarch=pwr |
| -mcpu=power3 | -qarch=pwr3 |
| -mcpu=power4 | -qarch=pwr4 |
| -mcpu=power5 | -qarch=pwr5 |
| -mcpu=power6 | -qarch=pwr6 |
| -mcpu=power6x | -qarch=pwr6e |
| -mcpu=power7 | -qarch=pwr7 |
| -mcpu=powerpc | -qarch=ppc |
| -mcpu=powerpc64 | -qarch=ppc64 |
| -mno-fused-madd | -qfloat=nomaf |
| -mfused-madd | -qfloat=maf |
| -mlong-double-64 | -qnoldbl128 |
| -mlong-double-128 | -qldbl128 |
| -mminimal-toc | -qminimaltoc |
| -mpower | -qarch=pwr |
| -mpowerpc | -qarch=ppc |
| -mpowerpc64 | -qarch=ppc64 |
| -mtune=970 | -qtune=ppc970 |
| -mtune=power | -qtune=pwr |
| -mtune=power3 | -qtune=pwr3 |
| -mtune=power4 | -qtune=pwr4 |
| -mtune=power5 | -qtune=pwr5 |
| -mtune=power6 | -qtune=pwr6 |
| -mtune=power6x | -qtune=pwr6e |
| -mtune=power7 | -qtune=pwr7 |
| -mtune=powerpc | -qtune=ppc |
| -mtune=powerpc64 | -qtune=ppc64 |
| -mxl-compat | -qfloat=nogcclongdouble |
| -mno-xl-compat | -qfloat=gcclongdouble |
| -mvsx | -qaltivec |
| -nodefaultlibs | -qnolib |
| -nostartfiles | -qnocrt |
| -nostdinc | -qnostdinc |
| -nostdlib | -qnolib -qnocrt |
| -O | -O |
| -O0 | -qnoopt |
| -O1 | -O |
| -O2 | -O2 |
| -O3 | -O3 |
| -Os | -O2 -qcompact |
| -Ofast | -O5 |
| -o | -o |
| -P | -qnoppline |
| -p | -p |
| -pg | -pg |
| -pthread | -qthreaded -D_REENTRANT -lpthread |
| -R | -R |
| -r | -r |
| -S | -S |
| -s | -s |
| -shared | -qmkshrobj |
| -shared-libgcc | -qnostaticlink=libgcc |
| -static | -qstaticlink |
| -static-libgcc | -qstaticlink=libgcc |
 -std=c89 | -F:c89 |
 -std=iso9899:1990 | -F:c89 |
 -std=iso9899:199409 | -F:c89 |
 -std=c99 | -Uinline -U__inline -F:c99 |
 -std=c9x | -F:c99 |
 -std=iso9899:1999 | -F:c99 |
 -std=iso9899:199x | -F:c99 |
 -std=gnu89 | -qlanglvl=extc89 |
 -std=gnu99 | -Uinline -U__inline -qlanglvl=extc99 |
 -std=gnu9x | -qlanglvl=extc99 |
 -std=gnu1x | -qlanglvl=extc1x |
 -std=gnu++98 | -qlanglvl=extended:referencecollapsing |
| -T* | -T* |
| -time | -qphsinfo |
| -trigraphs | -qtrigraph |
| -Umacro | -Umacro |
| -u | -u |
| --version | -qversion |
| -Wformat | -qformat |
| -Wformat=2 | -qformat=ALL:nonlt |
| -Wformat-extra-args | -qformat=exargs |
| -Wno-format-extra-args | -qformat=noexargs |
| -Wformat-nonliteral | -qformat=nlt |
| -Wno-format-nonliteral | -qformat=nonlt |
| -Wformat-security | -qformat=sec |
| -Wno-format-security | -qformat=nosec |
| -Wformat-y2k | -qformat=y2k |
| -Wno-format-y2k | -qformat=noy2k |
| -Wuninitialized | -qinfo=unset |
| -Wno-uninitialized | -qinfo=nounset |
| -Wunreachable-code | -qinfo=eff |
| -Wno-unreachable-code | -qinfo=noeff |
| -Wunused-parameter | -qinfo=par |
| -Wno-unused-parameter | -qinfo=nopar |
| -Wunused-variable | -qinfo=use |
| -Wno-unused-variable | -qinfo=nouse |
| -Wstack-protector | -qinfo=stp |
| -Wno-stack-protector | -qinfo=nostp |
| -Wfatal-errors | -qmaxerr=1:e |
 -Wno-reorder | -qsuppress=1540-5319 |
| -Wno-div-by-zero | -qsuppress=1506-232:1540-1800 |
| -Wendif-labels | -qlanglvl=notextafterendif |
| -Wno-endif-labels | -qlanglvl=textafterendif |
| -Wa,option | -Wa,option |
| -Wl,option | -Wl,option |
| -Wp,-MD, * | -Wp,-qmakedep=gcc,-MF* |
| -Wp,option | -Wp,option |
| -w | -w |
| -Xassembler option | -Wa,option |
| -Xlinker option | -Wl,option |
| -x assembler | -qsourcetype=assembler |
| -x assembler-with-cpp | -qsourcetype=assembler-with-cpp |
| -x c | -qsourcetype=c |
| -x c++ | -qsourcetype=c++ |
| -x none | -qsourcetype=default |
| -xassembler | -qsourcetype=assembler |
| -xassembler-with-cpp | -qsourcetype=assembler-with-cpp |
| -xc | -qsourcetype=c |
| -xc++ | -qsourcetype=c++ |
| -xnone | -qsourcetype=default |
Starting from XL C/C++ 12.1 for Linux, gxlc passes the -qlanglvl=referencecollapsing option to xlC by default for additional C++ compatibility.Note: When you use gxlc or gxlc++ on SUSE Linux Enterprise Server 11 (SLES11) and Red Hat Enterprise Linux 6 (RHEL6), the source code is compiled in the 64-bit compiler mode. On a lower level operating system, the source code is compiled in the 32-bit compiler mode.
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Document Information
Modified date:
08 August 2018
UID
swg27039015