Command line options of C++ compilers
Equivalences in options for free C++ compilers: Visual C++, BCC 5.5, MingW
and GCC, Open Watcom. This page is not a manual, you must read the manual
of the compiler for a complete description and role of each option. You have
to read the manuals for additionals options also.
The <xxx> string means that the angle-brackets enclose some kind of
thing, the whole must be replaced by a real name.
| Option | Visual C++ | BCC 5.5 | GCC |
|---|---|---|---|
| Display help | /? | No parameter. | -h --help |
| Minimize space | /O1 | -Ox | -Os |
| Maximize speed | /O2 | -Ox | |
| Disable optimizations | /Od | -O- | |
| Inline expansion | /Ob | Default, disable by -fno-default-inline |
|
| Check only syntax | /Zs | -fsyntax-only | |
| Line number debugging info | /Zd | -y | default -P remove |
| Compile only, no link | /c | -c | -c |
| Disable warnings | /w | -w- | |
| Linking with MSCVRT.LIB | /MD | ||
| Linking with LIBCMT.LIB | /MT | ||
| Create a DLL | /DL | -mdll | |
| Create Windows application | /GA | -tW | -mwindows |
| Create console application | -mconsole | ||
| Set stack size | /F
|
--stack<size> | |
| Default char type is unsigned | /J | -K | -funsigned-char |
| Allow nested comments | -C | Default | |
| Include files directory | /l | -I<directory> | -l<directory> |
| Libraries directory | -L<directory> | ||
| Force C++ compile | /TP | -P | -xc++ |
| Output file or directory | -n<directory> | -o<file> | |
| Pentium Instructions | /G5 or /G6 | -5 or -6 | -mpentium or -mpentiumpro |
| Executable file name | /Fe<filename> | -e<filename> | |
| Merge duplicate strings | -d | ||
| Define macros | /D<name> | -D<name> | -D<name> |
| Undefine macro | /U<name> | -U<name> | -U<name> |
| No header display | /nologo | ||
| Enable C++ EH | /GX | ||
| Disable extensions (as floating point) | /Za | -Ax | -mno-soft-float |
| External symbols have a leading underscore | Default -u- disables |
-fleading-underscore | |
| Enable exception handling | -x<exception> | -fexceptions | |
| Warn when a variable is unused | Default | Default | -Wunused |