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cmd/ld: add -extld and -extldflags options

Permits specifying the linker to use, and trailing flags to
pass to that linker, when linking in external mode.  External
mode linking is used when building a package that uses cgo, as
described in the cgo docs.

Also document -linkmode and -tmpdir.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8225043
This commit is contained in:
Ian Lance Taylor 2013-04-01 12:56:18 -07:00
parent df9f4f14b9
commit 9182c364aa
6 changed files with 52 additions and 5 deletions

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@ -114,6 +114,8 @@ main(int argc, char *argv[])
flagcount("a", "disassemble output", &debug['a']);
flagcount("c", "dump call graph", &debug['c']);
flagcount("d", "disable dynamic executable", &debug['d']);
flagstr("extld", "linker to run in external mode", &extld);
flagstr("extldflags", "flags for external linker", &extldflags);
flagcount("f", "ignore version mismatch", &debug['f']);
flagcount("g", "disable go package data checks", &debug['g']);
flagstr("k", "sym: set field tracking symbol", &tracksym);

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@ -107,6 +107,8 @@ main(int argc, char *argv[])
flagcount("a", "disassemble output", &debug['a']);
flagcount("c", "dump call graph", &debug['c']);
flagcount("d", "disable dynamic executable", &debug['d']);
flagstr("extld", "linker to run in external mode", &extld);
flagstr("extldflags", "flags for external linker", &extldflags);
flagcount("f", "ignore version mismatch", &debug['f']);
flagcount("g", "disable go package data checks", &debug['g']);
flagfn1("linkmode", "mode: set link mode (internal, external, auto)", setlinkmode);

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@ -113,6 +113,8 @@ main(int argc, char *argv[])
flagcount("a", "disassemble output", &debug['a']);
flagcount("c", "dump call graph", &debug['c']);
flagcount("d", "disable dynamic executable", &debug['d']);
flagstr("extld", "linker to run in external mode", &extld);
flagstr("extldflags", "flags for external linker", &extldflags);
flagcount("f", "ignore version mismatch", &debug['f']);
flagcount("g", "disable go package data checks", &debug['g']);
flagfn1("linkmode", "mode: set link mode (internal, external, auto)", setlinkmode);

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@ -71,5 +71,22 @@ Options new in this version:
NOTE: it only eliminates false positives caused by other function
calls, not false positives caused by dead temporaries stored in
the current function call.
-linkmode argument
Set the linkmode. The argument must be one of
internal, external, or auto. The default is auto.
This sets the linking mode as described in
../cgo/doc.go.
-tmpdir dir
Set the location to use for any temporary files. The
default is a newly created directory that is removed
after the linker completes. Temporary files are only
used in external linking mode.
-extld name
Set the name of the external linker to use in external
linking mode. The default is "gcc".
-extldflags flags
Set space-separated trailing flags to pass to the
external linker in external linking mode. The default
is to not pass any additional trailing flags.
*/
package main

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@ -609,7 +609,7 @@ void
hostlink(void)
{
char *p, **argv;
int i, w, n, argc, len;
int c, i, w, n, argc, len;
Hostobj *h;
Biobuf *f;
static char buf[64<<10];
@ -617,11 +617,22 @@ hostlink(void)
if(linkmode != LinkExternal || nerrors > 0)
return;
argv = malloc((10+nhostobj+nldflag)*sizeof argv[0]);
c = 0;
p = extldflags;
while(p != nil) {
while(*p == ' ')
p++;
if(*p == '\0')
break;
c++;
p = strchr(p + 1, ' ');
}
argv = malloc((10+nhostobj+nldflag+c)*sizeof argv[0]);
argc = 0;
// TODO: Add command-line flag to override gcc path and specify additional leading options.
// TODO: Add command-line flag to specify additional trailing options.
argv[argc++] = "gcc";
if(extld == nil)
extld = "gcc";
argv[argc++] = extld;
switch(thechar){
case '8':
argv[argc++] = "-m32";
@ -679,6 +690,17 @@ hostlink(void)
argv[argc++] = smprint("%s/go.o", tmpdir);
for(i=0; i<nldflag; i++)
argv[argc++] = ldflag[i];
p = extldflags;
while(p != nil) {
while(*p == ' ')
*p++ = '\0';
if(*p == '\0')
break;
argv[argc++] = p;
p = strchr(p + 1, ' ');
}
argv[argc] = nil;
quotefmtinstall();

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@ -157,6 +157,8 @@ EXTERN int flag_shared;
EXTERN char* tracksym;
EXTERN char* interpreter;
EXTERN char* tmpdir;
EXTERN char* extld;
EXTERN char* extldflags;
enum
{