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Let rpcgen(1) support an environment variable RPCGEN_CPP to find the C

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preprocessor to run.  Previously, it always ran /usr/bin/cpp, unless you
used the -Y option, and even then you could not set the basename.  It
also attempted to run /usr/ccs/lib/cpp for SVR4 compatibility, but this
is obsolete, and has been removed.

Note that setting RPCGEN_CPP to a command with arguments is supported,
though the command line parsing is simplistic.  However, setting it to
e.g. "gcc46 -E" or "clang -E" will lead to problems, because both gcc
and clang in -E mode will consider files with unknown extensions (such
as .x) as object files, and attempt to link them.

This could be worked around by also adding "-x c", but it is much safer
to set RPCGEN_CPP to e.g. "cpp46" or "clang-cpp" instead.

MFC after:	1 week
This commit is contained in:
Dimitry Andric 2012-02-06 12:03:21 +00:00
parent 600103fc0b
commit 0dac0ed841
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=231079
2 changed files with 47 additions and 31 deletions
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73
usr.bin/rpcgen/rpc_main.c
View file

@ -75,13 +75,8 @@ static void s_output(int, const char **, const char *, const char *, int, const
#define EXTEND 1 /* alias for TRUE */
#define DONT_EXTEND 0 /* alias for FALSE */
#define SVR4_CPP "/usr/ccs/lib/cpp"
#define SUNOS_CPP "/usr/bin/cpp"
static int cppDefined = 0; /* explicit path for C preprocessor */
static const char *svcclosetime = "120";
static const char *CPP = SVR4_CPP;
static const char *CPP = NULL;
static const char CPPFLAGS[] = "-C";
static char pathbuf[MAXPATHLEN + 1];
static const char *allv[] = {
@ -97,7 +92,7 @@ static int allnc = sizeof (allnv)/sizeof (allnv[0]);
* machinations for handling expanding argument list
*/
static void addarg(const char *); /* add another argument to the list */
static void putarg(int, const char *); /* put argument at specified location */
static void insarg(int, const char *); /* insert arg at specified location */
static void clear_args(void); /* clear argument list */
static void checkfiles(const char *, const char *);
/* check if out file already exists */
@ -105,7 +100,7 @@ static void checkfiles(const char *, const char *);
#define ARGLISTLEN 20
#define FIXEDARGS 2
#define FIXEDARGS 0
static char *arglist[ARGLISTLEN];
static int argcount = FIXEDARGS;
@ -288,24 +283,35 @@ clear_args(void)
argcount = FIXEDARGS;
}
/* make sure that a CPP exists */
/* prepend C-preprocessor and flags before arguments */
static void
find_cpp(void)
prepend_cpp(void)
{
int idx = 1;
const char *var;
char *dupvar, *s, *t;
struct stat buf;
if (stat(CPP, &buf) < 0) { /* SVR4 or explicit cpp does not exist */
if (cppDefined) {
warnx("cannot find C preprocessor: %s", CPP);
crash();
} else { /* try the other one */
CPP = SUNOS_CPP;
if (stat(CPP, &buf) < 0) { /* can't find any cpp */
warnx("cannot find C preprocessor: %s", CPP);
crash();
}
if (CPP != NULL)
insarg(0, CPP);
else if ((var = getenv("RPCGEN_CPP")) == NULL)
insarg(0, "/usr/bin/cpp");
else {
/* Parse command line in a rudimentary way */
dupvar = xstrdup(var);
for (s = dupvar, idx = 0; (t = strsep(&s, " \t")) != NULL; ) {
if (t[0])
insarg(idx++, t);
}
free(dupvar);
}
if (stat(arglist[0], &buf) < 0) {
warnx("cannot find C preprocessor: %s", arglist[0]);
crash();
}
insarg(idx, CPPFLAGS);
}
/*
@ -320,9 +326,7 @@ open_input(const char *infile, const char *define)
(void) pipe(pd);
switch (childpid = fork()) {
case 0:
find_cpp();
putarg(0, CPP);
putarg(1, CPPFLAGS);
prepend_cpp();
addarg(define);
if (infile)
addarg(infile);
@ -934,18 +938,26 @@ addarg(const char *cp)
}
/*
* Insert an argument at the specified location
*/
static void
putarg(int place, const char *cp)
insarg(int place, const char *cp)
{
if (place >= ARGLISTLEN) {
warnx("arglist coding error");
int i;
if (argcount >= ARGLISTLEN) {
warnx("too many defines");
crash();
/*NOTREACHED*/
}
if (cp != NULL)
arglist[place] = xstrdup(cp);
else
arglist[place] = NULL;
/* Move up existing arguments */
for (i = argcount - 1; i > place; i--)
arglist[i + 1] = arglist[i];
arglist[place] = xstrdup(cp);
argcount++;
}
/*
@ -1134,7 +1146,6 @@ parseargs(int argc, const char *argv[], struct commandline *cmd)
return (0);
}
CPP = pathbuf;
cppDefined = 1;
goto nextarg;

5
usr.bin/rpcgen/rpcgen.1
View file

@ -490,6 +490,11 @@ Give the name of the directory where
.Nm
will start looking for the C-preprocessor.
.El
.Sh ENVIRONMENT
If the
.Ev RPCGEN_CPP
environment variable is set, its value is used as the command line of the
C preprocessor to be run on the input file.
.Sh EXAMPLES
The following example:
.Dl example% rpcgen -T prot.x