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source: driver/cfa.cc @ 9398177

Last change on this file since 9398177 was c2d728c, checked in by Peter A. Buhr <pabuhr@…>, 13 months ago
add using namespace std to cfa.cc
Property mode set to `100644`
File size: 20.4 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// cfa.cc --
8	//
9	// Author : Peter A. Buhr
10	// Created On : Tue Aug 20 13:44:49 2002
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Thu Sep 28 21:53:54 2023
13	// Update Count : 484
14	//
15
16	#include <iostream>
17	#include <cstdio> // perror
18	#include <cstdlib> // putenv, exit
19	#include <climits> // PATH_MAX
20	#include <string> // STL version
21	#include <algorithm> // find
22	using namespace std;
23
24	#include <unistd.h> // execvp
25	#include <sys/types.h>
26	#include <sys/stat.h>
27
28	#include "Common/SemanticError.h"
29	#include "config.h" // configure info
30
31	//#define __DEBUG_H__
32
33	#define xstr(s) str(s)
34	#define str(s) #s
35
36	static string __CFA_FLAGPREFIX__( "__CFA_FLAG" ); // "__CFA_FLAG__=" suffix
37
38	static void Putenv( char * argv[], string arg ) {
39	// environment variables must have unique names
40	static int flags = 0;
41
42	// This allocation 'leaks' memory from the program to the execution
43	// environment, as putenv does not manage the storage of the string used
44	// as an environment variable. This leak is necessary to ensure the
45	// underlying C string is allocated long enough.
46	if ( putenv( (char )( new string( string( __CFA_FLAGPREFIX__ + to_string( flags++ ) + "__=" ) + arg ) ).c_str() ) ) {
47	cerr << argv[0] << " error, cannot set environment variable." << endl;
48	exit( EXIT_FAILURE );
49	} // if
50	} // Putenv
51
52	static bool prefix( const string & arg, const string & pre ) { // check if string has prefix
53	return arg.substr( 0, pre.size() ) == pre;
54	} // prefix
55
56	// check if string has suffix
57	static bool suffix( const string & arg ) {
58	enum { NumSuffixes = 3 };
59	static const string suffixes[NumSuffixes] = { "cfa", "hfa", "ifa" };
60
61	size_t dot = arg.find_last_of( "." );
62	if ( dot == string::npos ) return false;
63	const string * end = suffixes + NumSuffixes;
64	return std::find( suffixes, end, arg.substr( dot + 1 ) ) != end;
65	} // suffix
66
67	static inline bool dirExists( const string & path ) { // check if directory exists
68	struct stat info;
69	if ( stat( path.c_str(), &info ) != 0 ) return false;
70	return (info.st_mode & S_IFDIR) != 0;
71	} // dirExists
72
73	static inline string dir(const string & path) {
74	return path.substr(0, path.find_last_of('/'));
75	} // dir
76
77	// Different path modes
78	enum PathMode {
79	Installed, // cfa is installed, use prefix
80	BuildTree, // cfa is in the tree, use source and build tree
81	Distributed // cfa is distributed, use build tree for includes and executable directory for .cfs
82	};
83
84	// Get path mode from /proc
85	PathMode FromProc() {
86	std::string abspath;
87	abspath.resize(PATH_MAX);
88
89	// get executable path from /proc/self/exe
90	ssize_t size = readlink("/proc/self/exe", const_cast<char*>(abspath.c_str()), abspath.size());
91	if ( size <= 0 ) {
92	std::cerr << "Error could not evaluate absolute path from /proc/self/exe" << std::endl;
93	std::cerr << "Failed with " << std::strerror(errno) << std::endl;
94	std::exit(1);
95	} // if
96
97	// Trim extra characters
98	abspath.resize(size);
99
100	// Are we installed
101	if ( abspath.rfind(CFA_BINDIR, 0) == 0 ) { return Installed; }
102
103	// Is this the build tree
104	if ( abspath.rfind(TOP_BUILDDIR, 0 ) == 0 ) { return BuildTree; }
105
106	// Does this look like distcc
107	if ( abspath.find( "/.cfadistcc/" ) != std::string::npos ) { return Distributed; }
108
109	// None of the above? Give up since we don't know where the prelude or include directories are
110	std::cerr << "Cannot find required files from excutable path " << abspath << std::endl;
111	std::exit(1);
112	}
113
114
115	int main( int argc, char * argv[] ) {
116	string Version( CFA_VERSION_LONG ); // current version number from CONFIG
117	string Major( xstr( CFA_VERSION_MAJOR ) ), Minor( xstr( CFA_VERSION_MINOR ) ), Patch( xstr( CFA_VERSION_PATCH ) );
118
119	string installincdir( CFA_INCDIR ); // fixed location of include files
120	string installlibdir( CFA_LIBDIR ); // fixed location of cc1 and cfa-cpp commands when installed
121	string srcdriverdir ( TOP_BUILDDIR "driver"); // fixed location of cc1 and cfa-cpp commands when in tree
122
123	string heading; // banner printed at start of cfa compilation
124	string arg; // current command-line argument during command-line parsing
125	string bprefix; // path where gcc looks for compiler steps
126	string langstd; // language standard
127
128	string compiler_path( CFA_BACKEND_CC ); // path/name of C compiler
129	string compiler_name; // name of C compiler
130
131	bool x_flag = false; // -x flag
132	bool nonoptarg = false; // no non-option arguments specified, i.e., no file names
133	bool link = true; // link stage occurring
134	bool verbose = false; // -v flag
135	bool quiet = false; // -quiet flag
136	bool debug = true; // -debug flag
137	bool nolib = false; // -nolib flag
138	bool help = false; // -help flag
139	bool CFA_flag = false; // -CFA flag
140	bool cpp_flag = false; // -E or -M flag, preprocessor only
141	bool std_flag = false; // -std= flag
142	bool noincstd_flag = false; // -no-include-stdhdr= flag
143	bool debugging __attribute(( unused )) = false; // -g flag
144	bool m32 = false; // -m32 flag
145	bool m64 = false; // -m64 flag
146	bool compiling_libs = false;
147	int o_file = 0; // -o filename position
148
149	PathMode path = FromProc();
150
151	const char * args[argc + 100]; // cfa command line values, plus some space for additional flags
152	int sargs = 1; // starting location for arguments in args list
153	int nargs = sargs; // number of arguments in args list; 0 => command name
154
155	const char * libs[argc + 20]; // non-user libraries must come separately, plus some added libraries and flags
156	int nlibs = 0;
157
158	#ifdef __DEBUG_H__
159	cerr << "CFA:" << endl;
160	for ( int i = 1; i < argc; i += 1 ) {
161	cerr << "argv[" << i << "]:\"" << argv[i] << "\"" << endl;
162	} // for
163	#endif // __DEBUG_H__
164
165	// process command-line arguments
166
167	for ( int i = 1; i < argc; i += 1 ) {
168	arg = argv[i]; // convert to string value
169	if ( prefix( arg, "-" ) ) {
170	// pass through arguments
171
172	if ( arg == "-Xlinker" \|\| arg == "-o" ) {
173	args[nargs++] = argv[i]; // pass flag along
174	i += 1;
175	if ( i == argc ) continue; // next argument available ?
176	args[nargs++] = argv[i]; // pass argument along
177	if ( arg == "-o" ) o_file = i; // remember file
178
179	// CFA specific arguments
180
181	} else if ( strncmp(arg.c_str(), "-XCFA", 5) == 0 ) { // CFA pass through
182	if ( arg.size() == 5 ) {
183	i += 1;
184	if ( i == argc ) continue; // next argument available ?
185	Putenv( argv, argv[i] ); // make available for cc1
186	} else if ( arg[5] == ',' ) { // CFA specific arguments
187	string xcfargs = arg.substr( 6 ) + ","; // add sentinel
188	for ( ;; ) {
189	size_t posn = xcfargs.find_first_of( "," ); // find separator
190	if ( posn == string::npos ) break; // any characters left ?
191	string xcfarg = xcfargs.substr( 0, posn ); // remove XCFA argument
192	Putenv( argv, xcfarg ); // make available for cc1
193	xcfargs.erase( 0, posn + 1 ); // remove first argument and comma
194	} // for
195	} else { // CFA specific arguments
196	assert( false ); // this does not make sense
197	args[nargs++] = argv[i];
198	} // if
199	} else if ( arg == "-CFA" ) {
200	CFA_flag = true; // strip -CFA flag
201	link = false;
202	args[nargs++] = "-fsyntax-only"; // stop after stage 2
203	} else if ( arg == "-debug" ) {
204	debug = true; // strip debug flag
205	} else if ( arg == "-nodebug" ) {
206	debug = false; // strip nodebug flag
207	} else if ( arg == "-quiet" ) {
208	quiet = true; // strip quiet flag
209	} else if ( arg == "-noquiet" ) {
210	quiet = false; // strip noquiet flag
211	} else if ( arg == "-invariant" ) {
212	Putenv( argv, "-" + arg );
213	} else if ( arg == "--invariant" ) {
214	Putenv( argv, arg );
215	} else if ( arg == "-no-include-stdhdr" ) {
216	noincstd_flag = true; // strip no-include-stdhdr flag
217	} else if ( arg == "-nolib" ) {
218	nolib = true; // strip nolib flag
219	} else if ( arg == "-help" ) {
220	help = true; // strip help flag
221	} else if ( arg == "-nohelp" ) {
222	help = false; // strip nohelp flag
223	} else if ( arg == "-cfalib") {
224	compiling_libs = true;
225	} else if ( arg == "-compiler" ) {
226	// use the user specified compiler
227	i += 1;
228	if ( i == argc ) continue; // next argument available ?
229	compiler_path = argv[i];
230	Putenv( argv, arg + "=" + argv[i] );
231
232	// C specific arguments
233
234	} else if ( arg == "-v" ) {
235	verbose = true; // verbosity required
236	args[nargs++] = argv[i]; // pass flag along
237	} else if ( arg == "-g" ) {
238	debugging = true; // symbolic debugging required
239	args[nargs++] = argv[i]; // pass flag along
240	} else if ( arg == "-save-temps" \|\| arg == "--save-temps" ) {
241	args[nargs++] = argv[i]; // pass flag along
242	Putenv( argv, arg ); // save cfa-cpp output
243	} else if ( prefix( arg, "-x" ) ) { // file suffix ?
244	string lang;
245	args[nargs++] = argv[i]; // pass flag along
246	if ( arg.length() == 2 ) { // separate argument ?
247	i += 1;
248	if ( i == argc ) continue; // next argument available ?
249	lang = argv[i];
250	args[nargs++] = argv[i]; // pass argument along
251	} else {
252	lang = arg.substr( 2 );
253	} // if
254	if ( x_flag ) {
255	cerr << argv[0] << " warning, only one -x flag per compile, ignoring subsequent flag." << endl;
256	} else {
257	x_flag = true;
258	Putenv( argv, string( "-x=" ) + lang );
259	} // if
260	} else if ( prefix( arg, "-std=" ) \|\| prefix( arg, "--std=" ) ) {
261	std_flag = true; // -std=XX provided
262	args[nargs++] = argv[i]; // pass flag along
263	} else if ( arg == "-w" ) {
264	args[nargs++] = argv[i]; // pass flag along
265	Putenv( argv, arg );
266	} else if ( prefix( arg, "-W" ) ) { // check before next tests
267	if ( arg == "-Werror" \|\| arg == "-Wall" ) {
268	args[nargs++] = argv[i]; // pass flag along
269	Putenv( argv, argv[i] );
270	} else {
271	unsigned int adv = prefix( arg, "-Wno-" ) ? 5 : 2;
272	args[nargs] = argv[i]; // conditionally pass argument along
273	const char * warning = argv[i] + adv; // extract warning
274	if ( SemanticWarning_Exist( warning ) ) { // replace the argument for cfa-cpp
275	Putenv( argv, arg );
276	} // if
277	nargs += 1;
278	} // if
279	} else if ( prefix( arg, "-B" ) ) {
280	bprefix = arg.substr(2); // strip -B flag
281	} else if ( arg == "-c" \|\| arg == "-S" \|\| arg == "-E" \|\| arg == "-M" \|\| arg == "-MM" ) {
282	args[nargs++] = argv[i]; // pass flag along
283	if ( arg == "-E" \|\| arg == "-M" \|\| arg == "-MM" ) {
284	cpp_flag = true; // cpp only
285	} // if
286	link = false; // no linkage required
287	} else if ( arg == "-D" \|\| arg == "-U" \|\| arg == "-I" \|\| arg == "-MF" \|\| arg == "-MT" \|\| arg == "-MQ" \|\|
288	arg == "-include" \|\| arg == "-imacros" \|\| arg == "-idirafter" \|\| arg == "-iprefix" \|\|
289	arg == "-iwithprefix" \|\| arg == "-iwithprefixbefore" \|\| arg == "-isystem" \|\| arg == "-isysroot" ) {
290	args[nargs++] = argv[i]; // pass flag along
291	i += 1;
292	args[nargs++] = argv[i]; // pass argument along
293	} else if ( arg[1] == 'l' ) {
294	// if the user specifies a library, load it after user code
295	libs[nlibs++] = argv[i];
296	} else if ( arg == "-m32" ) {
297	m32 = true;
298	m64 = false;
299	args[nargs++] = argv[i];
300	} else if ( arg == "-m64" ) {
301	m64 = true;
302	m32 = false;
303	args[nargs++] = argv[i];
304	} else {
305	// concatenate any other arguments
306	args[nargs++] = argv[i];
307	} // if
308	} else {
309	bool cfa = suffix( arg ); // check suffix
310	if ( ! x_flag && cfa ) { // no explicit suffix and cfa suffix ?
311	args[nargs++] = "-x";
312	args[nargs++] = "c";
313	} // if
314	args[nargs++] = argv[i]; // concatenate files
315	if ( ! x_flag && cfa ) { // no explicit suffix and cfa suffix ?
316	args[nargs++] = "-x";
317	args[nargs++] = "none";
318	} // if
319	nonoptarg = true;
320	} // if
321	} // for
322
323	#ifdef __x86_64__
324	args[nargs++] = "-mcx16"; // allow double-wide CAS
325	#endif // __x86_64__
326
327	// ARM -mno-outline-atomics => use LL/SC instead of calls to atomic routines: __aarch64_swp_acq_rel, __aarch64_cas8_acq_rel
328	// ARM -march=armv8.2-a+lse => generate Arm LSE extension instructions SWAP and CAS
329	// https://community.arm.com/developer/tools-software/tools/b/tools-software-ides-blog/posts/making-the-most-of-the-arm-architecture-in-gcc-10
330	#ifdef __ARM_ARCH
331	args[nargs++] = "-mno-outline-atomics"; // use ARM LL/SC instructions for atomics
332	// args[nargs++] = "-march=armv8.2-a+lse"; // use atomic instructions
333	#endif // __ARM_ARCH
334
335	#ifdef __DEBUG_H__
336	cerr << "args:";
337	for ( int i = 1; i < nargs; i += 1 ) {
338	cerr << " " << args[i];
339	} // for
340	cerr << endl;
341	#endif // __DEBUG_H__
342
343	// -E flag stops at cc1 stage 1, so cfa-cpp in cc1 stage 2 is never executed.
344	if ( cpp_flag && CFA_flag ) {
345	CFA_flag = false;
346	cerr << argv[0] << " warning, both -E and -CFA flags specified, using -E and ignoring -CFA." << endl;
347	} // if
348
349	// add the CFA include-library paths, which allow direct access to header files without directory qualification
350	string libbase;
351	switch(path) {
352	case Installed:
353	args[nargs++] = "-I" CFA_INCDIR;
354	// do not use during build
355	if ( ! noincstd_flag ) {
356	args[nargs++] = "-I" CFA_INCDIR "stdhdr";
357	} // if
358	args[nargs++] = "-I" CFA_INCDIR "concurrency";
359	args[nargs++] = "-I" CFA_INCDIR "collections";
360	libbase = CFA_LIBDIR;
361	break;
362	case BuildTree:
363	case Distributed:
364	args[nargs++] = "-I" TOP_SRCDIR "libcfa/src";
365	// do not use during build
366	if ( ! noincstd_flag ) {
367	args[nargs++] = "-I" TOP_SRCDIR "libcfa/src" "/stdhdr";
368	} // if
369	args[nargs++] = "-I" TOP_SRCDIR "libcfa/src" "/concurrency";
370	args[nargs++] = "-I" TOP_SRCDIR "libcfa/src" "/collections";
371
372	libbase = TOP_BUILDDIR "libcfa/";
373
374	break;
375	} // if
376
377	// add stdbool to get defines for bool/true/false
378	args[nargs++] = "-imacros";
379	args[nargs++] = "stdbool.h";
380
381	if ( compiling_libs ) {
382	Putenv( argv, "-t" );
383	} // if
384
385	string arch( m32 ? CFA_32_CPU : (m64 ? CFA_64_CPU : CFA_DEFAULT_CPU) );
386	if ( ! m32 && ! m64 ) {
387	if ( arch == "x86" ) {
388	args[nargs++] = "-m32";
389	} else if ( arch == "x64" ) {
390	args[nargs++] = "-m64";
391	} // if
392	} // if
393
394	const char * config = nolib ? "nolib" : (debug ? "debug": "nodebug");
395	string libdir = libbase + arch + "-" + config;
396
397	if ( path != Distributed ) {
398	if ( ! nolib && ! dirExists( libdir ) ) {
399	cerr << argv[0] << " internal error, configuration " << config << " not installed." << endl;
400	cerr << "Was looking for " << libdir << endl;
401	for(int i = 1; i < argc; i++) {
402	cerr << argv[i] << " ";
403	}
404	cerr << endl;
405	libdir = libbase + arch + "-" + "nolib";
406	} // if
407
408	if ( ! dirExists( libdir ) ) {
409	cerr << argv[0] << " internal error, cannot find prelude directory." << endl;
410	cerr << "Was looking for " << libdir << endl;
411	exit( EXIT_FAILURE );
412	} // if
413	} // if
414
415	string preludedir;
416	switch(path) {
417	case Installed : preludedir = libdir; break;
418	case BuildTree : preludedir = libdir + "/prelude"; break;
419	case Distributed : preludedir = dir(argv[0]); break;
420	} // switch
421
422	Putenv( argv, "--prelude-dir=" + preludedir );
423	args[nargs++] = "-include";
424	args[nargs++] = (*new string(preludedir + "/defines.hfa")).c_str();
425
426	for ( int i = 0; i < nlibs; i += 1 ) { // copy non-user libraries after all user libraries
427	args[nargs++] = libs[i];
428	} // for
429
430	if ( link ) {
431	args[nargs++] = "-Xlinker";
432	args[nargs++] = "--undefined=__cfaabi_dbg_bits_write";
433	args[nargs++] = "-Xlinker";
434	args[nargs++] = "--undefined=__cfaabi_interpose_startup";
435	args[nargs++] = "-Xlinker";
436	args[nargs++] = "--undefined=__cfaabi_appready_startup";
437	args[nargs++] = "-z";
438	args[nargs++] = "execstack";
439
440	// include the cfa library in case it is needed
441	args[nargs++] = ( *new string( string("-L" ) + libdir + (path != Installed ? "/src/.libs" : "")) ).c_str();
442	args[nargs++] = ( *new string( string("-Wl,-rpath," ) + libdir + (path != Installed ? "/src/.libs" : "")) ).c_str();
443	args[nargs++] = "-Wl,--push-state,--as-needed";
444	args[nargs++] = "-lcfathread";
445	args[nargs++] = "-Wl,--pop-state";
446	args[nargs++] = "-Wl,--push-state,--no-as-needed";
447	args[nargs++] = "-lcfa";
448	args[nargs++] = "-Wl,--pop-state";
449	args[nargs++] = "-pthread";
450	#if defined( __x86_64__ ) \|\| defined( __ARM_ARCH )
451	args[nargs++] = "-latomic"; // allow double-wide CAS
452	#endif // __x86_64__
453	args[nargs++] = "-ldl";
454	args[nargs++] = "-lm";
455	} // if
456
457	args[nargs++] = "-fexceptions"; // add exception flags (unconditionally)
458	args[nargs++] = "-D_GNU_SOURCE"; // force gnu libraries
459
460	// add flags based on the type of compile
461
462	args[nargs++] = ( *new string( string("-D__CFA_MAJOR__=") + Major ) ).c_str();
463	args[nargs++] = ( *new string( string("-D__CFA_MINOR__=") + Minor ) ).c_str();
464	args[nargs++] = ( *new string( string("-D__CFA_PATCH__=") + Patch ) ).c_str();
465	args[nargs++] = "-D__CFA__";
466	args[nargs++] = "-D__CFORALL__";
467	args[nargs++] = "-D__cforall";
468
469	if ( cpp_flag ) {
470	args[nargs++] = "-D__CPP__";
471	} // if
472
473	if ( CFA_flag ) {
474	Putenv( argv, "-N" );
475	Putenv( argv, "-CFA" );
476	// -CFA implies cc1 stage 2, but gcc does not pass the -o file to this stage because it believe the file is for
477	// the linker. Hence, the -o file is explicit passed to cc1 stage 2 and used as cfa-cpp's output file.
478	if ( o_file ) Putenv( argv, string( "-o=" ) + argv[o_file] );
479	} else {
480	Putenv( argv, "-L" );
481	} // if
482
483	if ( debug ) {
484	heading += " (debug)";
485	args[nargs++] = "-D__CFA_DEBUG__";
486	} else {
487	heading += " (no debug)";
488	} // if
489
490	if ( bprefix.length() == 0 ) {
491	switch(path) {
492	case Installed : bprefix = installlibdir; break;
493	case BuildTree : bprefix = srcdriverdir ; break;
494	case Distributed : bprefix = dir(argv[0]) ; break;
495	} // switch
496	} // if
497	if ( bprefix[bprefix.length() - 1] != '/' ) bprefix += '/';
498	Putenv( argv, string("-B=") + bprefix );
499
500	args[nargs++] = "-Xlinker"; // used by backtrace
501	args[nargs++] = "-export-dynamic";
502
503	// execute the compilation command
504
505	args[0] = compiler_path.c_str(); // set compiler command for exec
506	// find actual name of the compiler independent of the path to it
507	int p = compiler_path.find_last_of( '/' ); // scan r -> l for first '/'
508	if ( p == -1 ) {
509	compiler_name = compiler_path;
510	} else {
511	compiler_name = *new string( compiler_path.substr( p + 1 ) );
512	} // if
513
514	if ( prefix( compiler_name, "gcc" ) ) { // allow suffix on gcc name
515	args[nargs++] = "-no-integrated-cpp";
516	args[nargs++] = "-Wno-deprecated";
517	args[nargs++] = "-Wno-strict-aliasing"; // casting from one type to another
518	#ifdef HAVE_CAST_FUNCTION_TYPE
519	args[nargs++] = "-Wno-cast-function-type";
520	#endif // HAVE_CAST_FUNCTION_TYPE
521	if ( ! std_flag && ! x_flag ) {
522	args[nargs++] = "-std=gnu11"; // default c11, if none specified
523	} // if
524	args[nargs++] = "-fgnu89-inline";
525	args[nargs++] = "-D__int8_t_defined"; // prevent gcc type-size attributes
526	args[nargs++] = ( *new string( string("-B") + bprefix ) ).c_str();
527	} else {
528	cerr << argv[0] << " error, compiler \"" << compiler_name << "\" unsupported." << endl;
529	exit( EXIT_FAILURE );
530	} // if
531
532	args[nargs] = nullptr; // terminate
533
534	#ifdef __DEBUG_H__
535	cerr << "nargs: " << nargs << endl;
536	cerr << "args:" << endl;
537	for ( int i = 0; args[i] != nullptr; i += 1 ) {
538	cerr << " \"" << args[i] << "\"" << endl;
539	} // for
540	cerr << endl;
541	#endif // __DEBUG_H__
542
543	if ( ! quiet ) {
544	cerr << "CFA " << "Version " << Version << heading << endl;
545	if ( help ) {
546	cerr <<
547	"-debug\t\t\t: use cfa runtime with debug checking" << endl <<
548	"-help\t\t\t: print this help message" << endl <<
549	"-quiet\t\t\t: print no messages from the cfa command" << endl <<
550	"-CFA\t\t\t: run the cpp preprocessor and the cfa-cpp translator" << endl <<
551	"-XCFA -cfa-cpp-flag\t: pass next flag as-is to the cfa-cpp translator" << endl <<
552	"...\t\t\t: any other " << compiler_name << " flags" << endl;
553	} // if
554	} // if
555
556	if ( verbose ) {
557	if ( argc == 2 ) exit( EXIT_SUCCESS ); // if only the -v flag is specified, do not invoke gcc
558
559	for ( int i = 0; args[i] != nullptr; i += 1 ) {
560	cerr << args[i] << " ";
561	} // for
562	cerr << endl;
563	} // if
564
565	if ( ! nonoptarg ) {
566	cerr << argv[0] << " error, no input files" << endl;
567	exit( EXIT_FAILURE );
568	} // if
569
570	// execute the command and return the result
571
572	execvp( args[0], (char * const *)args ); // should not return
573	perror( "CFA Translator error: execvp" );
574	exit( EXIT_FAILURE );
575	} // main
576
577	// Local Variables: //
578	// tab-width: 4 //
579	// mode: c++ //
580	// compile-command: "make install" //
581	// End: //

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