From c14321c4d35549d989d614437953b36b8c771cc2 Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Mon, 1 Dec 2025 19:10:53 +0100
Subject: c: make tentative definitions work

---
 obj/elf.c | 14 ++++++++++++++
 obj/obj.c |  7 +++++++
 obj/obj.h |  1 +
 3 files changed, 22 insertions(+)

(limited to 'obj')

diff --git a/obj/elf.c b/obj/elf.c
index d889fdd..5578452 100644
--- a/obj/elf.c
+++ b/obj/elf.c
@@ -87,6 +87,20 @@ enum {
    BSS_SHNDX    = 4,
 };
 
+enum section
+elfhassym(const char *nam)
+{
+   struct sym *sym = findsym(str2idx(nam));
+   if (sym) switch (sym->shndx) {
+   case SHN_UND: return Snone;
+   case TEXT_SHNDX: return Stext;
+   case RODATA_SHNDX: return Srodata;
+   case DATA_SHNDX: return Sdata;
+   case BSS_SHNDX: return Sbss;
+   }
+   return Snone;
+}
+
 void
 elfaddsym(const char *nam, int info, enum section sect, uvlong value, uvlong size)
 {
diff --git a/obj/obj.c b/obj/obj.c
index b9e2c79..fa62e9e 100644
--- a/obj/obj.c
+++ b/obj/obj.c
@@ -6,6 +6,7 @@
 
 
 void elfinit(void);
+enum section elfhassym(const char *);
 void elfaddsym(const char *, int info, enum section, uvlong value, uvlong size);
 void elfreloc(const char *sym, enum relockind, enum section, uint off, vlong addend);
 void elffini(struct wbuf *);
@@ -38,6 +39,12 @@ objdeffunc(const char *nam, bool globl, uint off, uint siz)
    }
 }
 
+enum section
+objhassym(const char *name)
+{
+   return elfhassym(name);
+}
+
 uint
 objnewdat(const char *name, enum section sec, bool globl, uint siz, uint align)
 {
diff --git a/obj/obj.h b/obj/obj.h
index 235ab4d..8e9dea8 100644
--- a/obj/obj.h
+++ b/obj/obj.h
@@ -23,6 +23,7 @@ enum section { Snone, Stext, Srodata, Sdata, Sbss };
 
 void objini(const char *infile, const char *outfile);
 void objdeffunc(const char *nam, bool globl, uint off, uint siz);
+enum section objhassym(const char *name);
 uint objnewdat(const char *name, enum section, bool globl, uint siz, uint align);
 void objreloc(const char *sym, enum relockind, enum section, uint off, vlong addend);
 void objfini(void);
-- 
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