Add comdat support.

	Start of work for deduping symbols.

2 files changed, 4 insertions, 0 deletions

diff --git a/6/asm.h b/6/asm.h
index 82b1b6d..ed75659 100644
--- a/6/asm.h
+++ b/6/asm.h
@@ -74,6 +74,7 @@ struct Blob {
 	size_t align;
 	char *lbl;  /* may be null */
 	char isglobl;
+	char iscomdat;
 	union {
 		uint64_t npad;
 		uint64_t ival;
diff --git a/6/gengas.c b/6/gengas.c
index 5307661..5f15c38 100644
--- a/6/gengas.c
+++ b/6/gengas.c
@@ -304,6 +304,8 @@ static void writeblob(FILE *fd, Blob *b)
 	if (!b)
 		return;
 	if (b->lbl) {
+		if (b->iscomdat)
+			fprintf(fd, ".section .text.%s%s,\"axG\",%s%s,comdat\n", Symprefix, b->lbl, Symprefix, b->lbl);
 		if (b->isglobl)
 			fprintf(fd, ".globl %s%s\n", Symprefix, b->lbl);
 		fprintf(fd, "%s%s:\n", Symprefix, b->lbl);
@@ -356,6 +358,7 @@ static void gentype(FILE *fd, Type *ty)
 
 	ty->isemitted = 1;
 	b = tydescblob(ty);
+	b->iscomdat = 1;
 	writeblob(fd, b);
 	blobfree(b);
 }