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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
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@ -114,6 +114,8 @@ main(int argc, char *argv[])
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flagcount("a", "disassemble output", &debug['a']);
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flagcount("c", "dump call graph", &debug['c']);
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flagcount("d", "disable dynamic executable", &debug['d']);
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flagstr("extld", "linker to run in external mode", &extld);
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flagstr("extldflags", "flags for external linker", &extldflags);
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flagcount("f", "ignore version mismatch", &debug['f']);
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flagcount("g", "disable go package data checks", &debug['g']);
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flagstr("k", "sym: set field tracking symbol", &tracksym);
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@ -107,6 +107,8 @@ main(int argc, char *argv[])
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flagcount("a", "disassemble output", &debug['a']);
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flagcount("c", "dump call graph", &debug['c']);
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flagcount("d", "disable dynamic executable", &debug['d']);
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flagstr("extld", "linker to run in external mode", &extld);
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flagstr("extldflags", "flags for external linker", &extldflags);
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flagcount("f", "ignore version mismatch", &debug['f']);
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flagcount("g", "disable go package data checks", &debug['g']);
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flagfn1("linkmode", "mode: set link mode (internal, external, auto)", setlinkmode);
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@ -113,6 +113,8 @@ main(int argc, char *argv[])
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flagcount("a", "disassemble output", &debug['a']);
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flagcount("c", "dump call graph", &debug['c']);
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flagcount("d", "disable dynamic executable", &debug['d']);
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flagstr("extld", "linker to run in external mode", &extld);
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flagstr("extldflags", "flags for external linker", &extldflags);
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flagcount("f", "ignore version mismatch", &debug['f']);
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flagcount("g", "disable go package data checks", &debug['g']);
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flagfn1("linkmode", "mode: set link mode (internal, external, auto)", setlinkmode);
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@ -71,5 +71,22 @@ Options new in this version:
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NOTE: it only eliminates false positives caused by other function
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calls, not false positives caused by dead temporaries stored in
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the current function call.
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-linkmode argument
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Set the linkmode. The argument must be one of
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internal, external, or auto. The default is auto.
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This sets the linking mode as described in
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../cgo/doc.go.
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-tmpdir dir
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Set the location to use for any temporary files. The
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default is a newly created directory that is removed
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after the linker completes. Temporary files are only
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used in external linking mode.
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-extld name
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Set the name of the external linker to use in external
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linking mode. The default is "gcc".
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-extldflags flags
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Set space-separated trailing flags to pass to the
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external linker in external linking mode. The default
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is to not pass any additional trailing flags.
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*/
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package main
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@ -609,7 +609,7 @@ void
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hostlink(void)
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{
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char *p, **argv;
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int i, w, n, argc, len;
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int c, i, w, n, argc, len;
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Hostobj *h;
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Biobuf *f;
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static char buf[64<<10];
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@ -617,11 +617,22 @@ hostlink(void)
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if(linkmode != LinkExternal || nerrors > 0)
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return;
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argv = malloc((10+nhostobj+nldflag)*sizeof argv[0]);
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c = 0;
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p = extldflags;
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while(p != nil) {
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while(*p == ' ')
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p++;
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if(*p == '\0')
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break;
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c++;
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p = strchr(p + 1, ' ');
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}
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argv = malloc((10+nhostobj+nldflag+c)*sizeof argv[0]);
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argc = 0;
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// TODO: Add command-line flag to override gcc path and specify additional leading options.
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// TODO: Add command-line flag to specify additional trailing options.
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argv[argc++] = "gcc";
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if(extld == nil)
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extld = "gcc";
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argv[argc++] = extld;
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switch(thechar){
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case '8':
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argv[argc++] = "-m32";
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@ -679,6 +690,17 @@ hostlink(void)
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argv[argc++] = smprint("%s/go.o", tmpdir);
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for(i=0; i<nldflag; i++)
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argv[argc++] = ldflag[i];
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p = extldflags;
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while(p != nil) {
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while(*p == ' ')
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*p++ = '\0';
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if(*p == '\0')
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break;
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argv[argc++] = p;
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p = strchr(p + 1, ' ');
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}
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argv[argc] = nil;
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quotefmtinstall();
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@ -157,6 +157,8 @@ EXTERN int flag_shared;
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EXTERN char* tracksym;
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EXTERN char* interpreter;
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EXTERN char* tmpdir;
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EXTERN char* extld;
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EXTERN char* extldflags;
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enum
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{
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