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cwinvoke one or more compilers with argument translation


cw [-C] [--versions] [--noecho] --primary compiler [--shadow compiler ...] -- compiler args ...


cw is a facility for invoking one or more compilers, providing translation from Sun style arguments as appropriate. This allows the use of arbitrary compilers without the need to alter large numbers of makefiles. A mode called shadow compilation invokes multiple compilers so that warnings and errors may be obtained from both. See SHADOW COMPILATION for details. This version of cw supports compilers with both Sun Studio 12 and GCC-style command lines.


Both the --primary and --secondary parameters take a compiler specification. This is a comma-separated list of the form name,executable,style Where name is a name for the compiler, executable is the full path to the compiler executable, and style is the style of command-line options the compiler expects, either sun or gnu.
--primary compiler
Specify the compiler to be used primarily (that which is used for link-editing and pre-processing, and whos objects we deliver).
--shadow compiler
Specify a shadow compiler, which builds sources for the sake of checking code quality and compatibility, but has its output discarded.
Do not echo the actual command line of any compilers invoked.
Request from each configured primary and shadow compiler its version information.
The sources being compiled are C++. This is necessary as it affects the translation of compiler arguments.
Arguments intended for the compilers themselves must be separated from those of cw by a --.
Parameters intended for the compiler be guarded with options of the form -_name= and -_style= Where name and style are those passed to --primary and --shadow this allows certain flags to be passed only to certain classes of compiler.
For historical reasons, the -_style= option is also translated such that a style of sun may use the flag -_cc= and a style of gnu may use the flag -_gcc=, and when the -C option is given and C++ is in use the style of sun may use the flag -_CC= and the style of gnu may use the flag -_g++=.


If --shadow compilers are specified cw will invoke shadow compiler, with the outputs modified (as well as any translation for compiler style) as follows:
  1. If none of -c, -E, -P, or -S appears in the argument list (that is, linking is attempted), the shadow compilers will not be invoked. This is because the objects built with that compiler which would be linked have been previously discarded.
  2. If an option of the form -o filename was provided, it will be replaced by two options of the form -o tempfile
  3. If the option -o was not provided, -o tempfile will be added to the end of the argument list used to invoke the shadow compilers.
When shadow compilation is in effect, cw writes to standard error each compiler's standard error output following its argument list. Messages from the compilers will not be interleaved. If cw is used to invoke the preprocessor and no output location is specified, cw will write to standard output the primary compiler's standard output, and the secondary compiler's standard output will be discarded.
Because the Sun compilers write intermediate objects to fixed filenames in the current directory when instructed to compile and link multiple source files via a single command line, it would be unsafe to invoke more than one compiler in this fashion. Therefore cw does not accept multiple source files unless the preprocessor is to be invoked. An attempt to invoke cw in this manner will result in an error.


If the compiler to be invoked is a GNU-style C or C++ compiler, a set of default flags is added to the beginning of the argument list, and the remaining arguments are translated to their closest appropriate semantic equivalents and passed in the same order as their counterparts given to cw. See the comments at the head of usr/src/tools/cw/cw.c for a detailed list of translations.


If this variable is set in the environment, invoke the primary compiler, wait for it to complete, then invoke the shadow compilers. Normally the primary and shadow compilers are invoked in parallel.
If this variable is set in the environment, write the usual output to standard error but do not actually invoke any compiler. This is useful for debugging the translation engine.


The following exit status values are returned:
The primary compiler, and shadow compilers if invoked, both completed successfully.
A usage error occurred, or one or more compilers returned a nonzero exit status.


cc(1), CC(1), gcc(1)


The translations provided for gcc are not always exact and in some cases reflect local policy rather than actual equivalence.
Additional compiler types should be supported.
The translation engine is hacky.
February 10, 2018 illumos