<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/93915>93915</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            ld.lld risc-V does not merge BSS sections properly.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            lld
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          wom-bat
      </td>
    </tr>
</table>

<pre>
    Script to reproduce attached.  For aarch64, the `_bss_end` symbol is correctly after the bss section; for risc-V the BSS symbol 'd' appears _after_  `_bss_end`. GNU binutils links correctly.
Found in version 1.18

```
#!/bin/sh
TARGET="-target riscv64 -march=rv64imac -mabi=lp64 -nostdlib"
#TARGET="-target aarch64 -nostdlib"

cat > a.c <<\EOF
int a; /* in bss */
char _stack[4096];
extern int b(void);
int main()
{
   a = b();
   return a;
}
EOF

cat > b.c <<\EOF
int d; /* in bss */
int b() {
   d += 1;
   return d;
}
EOF

cat > script.ld <<\EOF
PHDRS
{
    text PT_LOAD;
    data PT_LOAD;
}

ENTRY(_start);

SECTIONS
{
    . = 0x200000;

    .text :
    {
        _text = .;
 *(.text.start)
        *(.text*)
        *(.rodata)
 _text_end = .;
    } :text

    . = ALIGN(0x1000);
    .bss :
 {
        _bss = .;
        *(.bss)
        *(COMMON)
 . = ALIGN(4);
        _bss_end = .;
    } :data
}

EOF

# cat > crt0.s <<\EOF
# .extern main

# .section ".text.start"

# .global _start;
# .type _start, %function;
# _start:
#     ldr x1, =_stack + 0xff0
#     mov sp, x1
#     b main
# EOF
cat > crt0.s <<\EOF
.extern main

.section ".text.start"

.global _start;
.type _start, %function;
_start:
    la s1, (_stack + 0xff0)
    mv sp, s1
 j main
EOF

clang ${TARGET} -ffreestanding -c a.c
clang ${TARGET} -ffreestanding -c b.c
clang ${TARGET} -c crt0.s -o crt0.o
ld.lld -o a.elf crt0.o a.o b.o -T script.ld

nm -n a.elf
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJyUVl1v4jgU_TXm5QrLcYDAQx6AlO5IM-2oZVfaJ-TYBjzjxMg2LP33KzsBAqUznQil6T3349yTazvMObWppczRcIaGRY_t_dbY_D9T9Uvme6URb_krt2rnwRuwcmeN2HMJzHvGt1JggIWxwJjl29EA0Tn4rQQ0IqvSuZWsBRoRcG9VaTQoB9xYK7nXb8DWXtroXDoHTnKvTI3SGayNBasc7_8T0dnr6yke0UwgmgHb7SSzDlYxxwpuymF4fPobSlXvvdIOtKp_dgpjRApEpguzrwWoGg7SOmVqSHAybqD2PiLtr_mXpogmiC5KVSO6cNvGvJy-PD4sUVogSvue2Y30kfxhNIB-FURBaWEPo4GqGA-WUqG00LsA18Z5oVWJKD3XuJev1fZeQLxz5gGlD8AwB5TOw284f3heNKiqPbCgK6ILRKeh5SA4otNgaBJsmYWV84z_RMPZgExGaFigdNag8uilrSHkKREdH4wSiE7OcLBXLIgyDuaGV9aCAMAApUWM7EYBgJV-b-vI7RRVNA9n7tf9lR_2J37d34k6ohPoUhOA6CywS-7wEp_m5eLywFrcYff9r-Ll9b0o4OXRw_fl6uvztOgWB8E8ewecGbQ8npYv_yI6Dq_M-q6szf31Yb788vx0ry6Ob4McKQnXTVx0iMxQ2jFdJQjXqvUpAF-4R8HHMRyfeV2FdTzi433YmiDBBY3Fwsq-LRiZFYFqzHjbR3Sffv3y-ITomByT0O71AAKOg3Ju9X2fDX5btUO2dO6DPubP3749P13Aaz6DWyqncr9uNCpzdyKuJxPRFE7Tya0n2N0ZzeCE28UdF_BNAtzuyYAovXqt9J3nRpuSaWjn8TxUAfJvO3kC6BwQHa739Wmvv_idQjtZw6WFhWMSA9Oi2aHCmgVyXK_JtWtlDuB2wfWYXCNltz2awlmB30r0kTyfk-YDWT4jyY0cUQoGrlGiWfhXSnRnsDrp4Fod4Eengds9TLN6A4gOUDZrz56sgP56baV0ntVC1Rvo83C2_FlA-ZsAflK9b5on07hrgbUWwcqw1OsWA4YNlNhAf3nZbrt91BX06ybk5vjuiTwVk3TCejJPsiRLKKWDrLfNiRCSJSRNRkkyysYJHY4ma074KM14wtO0p3JK6IAM04RQOiAZXhPORZZMJglJxpILNCCyYkpjrQ8VNnbTU87tZT5JJ8mwp1kptYvfVZRqLcJ0DIuezYN3v9xvHBoQrZx3l3ivvJZ5q0H7ESSMdFAbD5W0m_Z7qBk_BztrdtLqN9zbW51vvd-5MDThJFxslN_uS8xNhegiVGj_9HfW_JDcI7qIdB2ii4bxIaf_BwAA__8SIbZV">