The Zi8 option generates unexpected symbols

[mazegen]

This code:

.code
 mov eax, ebx
 add eax, ecx
 ja @F
 sub eax, edx
@@:
 nop
end

When compiled with uasm64.exe -win64 -c (v2.57), it generates no symbols in the .obj file, as expected. This is output of dumpbin /symbols:

File Type: COFF OBJECT

COFF SYMBOL TABLE
000 00000000 DEBUG  notype       Filename     | .file
    test3.asm
002 00000000 SECT1  notype       Static       | .text
    Section length    9, #relocs    0, #linenums    0, checksum        0
004 00000000 SECT2  notype       Static       | .data
    Section length    0, #relocs    0, #linenums    0, checksum        0

String Table Size = 0x0 bytes

The same source compiled with uasm64.exe -win64 -c -Zi8 generates symbol $$000000 at offset 0 and symbol L&_0001 for the anonymous label @@. Is this expected?

File Type: COFF OBJECT

COFF SYMBOL TABLE
000 00000000 SECT1  notype       Static       | .text
    Section length    9, #relocs    0, #linenums    0, checksum        0
002 00000000 SECT2  notype       Static       | .data
    Section length    0, #relocs    0, #linenums    0, checksum        0
004 00000000 SECT3  notype       Static       | .debug$S
    Section length  2CC, #relocs    4, #linenums    0, checksum        0
006 00000000 SECT4  notype       Static       | .debug$T
    Section length 13C0, #relocs    0, #linenums    0, checksum        0
008 00000000 SECT1  notype       Label        | $$000000
009 00000008 SECT1  notype       Label        | L&_0001

String Table Size = 0x0 bytes

[john-terraspace]

Probably not – I can’t think of a good reason why switching to Zi8 would generate symbols specifically – there’s probably a missing case to prevent symbol writing specifically in the coff CV v8 version of the code. Good spot! From: mazegen ***@***.***> Sent: 14 January 2026 17:33 To: Terraspace/UASM ***@***.***> Cc: Subscribed ***@***.***> Subject: [Terraspace/UASM] The Zi8 option generates unexpected symbols (Issue #235) <https://avatars.githubusercontent.com/u/6680815?s=20&v=4> mazegen created an issue (Terraspace/UASM#235) <#235> This code: .code mov eax, ebx add eax, ecx ja @f sub eax, edx @@: nop end When compiled with uasm64.exe -win64 -c (v2.57), it generates no symbols in the .obj file, as expected. This is output of dumpbin /symbols: File Type: COFF OBJECT COFF SYMBOL TABLE 000 00000000 DEBUG notype Filename | .file test3.asm 002 00000000 SECT1 notype Static | .text Section length 9, #relocs 0, #linenums 0, checksum 0 004 00000000 SECT2 notype Static | .data Section length 0, #relocs 0, #linenums 0, checksum 0 String Table Size = 0x0 bytes The same source compiled with uasm64.exe -win64 -c -Zi8 generates symbol $$000000 at offset 0 and symbol L&_0001 for the anonymous label @@. Is this expected? File Type: COFF OBJECT COFF SYMBOL TABLE 000 00000000 SECT1 notype Static | .text Section length 9, #relocs 0, #linenums 0, checksum 0 002 00000000 SECT2 notype Static | .data Section length 0, #relocs 0, #linenums 0, checksum 0 004 00000000 SECT3 notype Static | .debug$S Section length 2CC, #relocs 4, #linenums 0, checksum 0 006 00000000 SECT4 notype Static | .debug$T Section length 13C0, #relocs 0, #linenums 0, checksum 0 008 00000000 SECT1 notype Label | $$000000 009 00000008 SECT1 notype Label | L&_0001 String Table Size = 0x0 bytes — Reply to this email directly, view it on GitHub <#235> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEAZAVCWKPY4RV62IOICXLT4GZ4TLAVCNFSM6AAAAACRWJ5TICVHI2DSMVQWIX3LMV43ASLTON2WKOZTHAYTIMJWGM3DQOA> . You are receiving this because you are subscribed to this thread. <https://github.com/notifications/beacon/AEAZAVCMYRTQCCNYMVBAFG34GZ4TLA5CNFSM6AAAAACRWJ5TICWGG33NNVSW45C7OR4XAZNFJFZXG5LFVJRW63LNMVXHIX3JMTHOGV4E5A.gif> Message ID: ***@***.***>

[mazegen]

There's similar problem with this code. Without Zi8, no symbols are generated, as expected:

my MACRO cond:REQ
 .IF cond
    nop 
 .ENDIF
ENDM

.code
 mov eax, ebx
 my eax==1
 add eax, ecx
 nop
end

However, with Zi8, the "expansion" of the .IF generates symbol @C0001:

COFF SYMBOL TABLE
000 00000000 SECT1  notype       Static       | .text
    Section length    B, #relocs    0, #linenums    0, checksum        0
002 00000000 SECT2  notype       Static       | .data
    Section length    0, #relocs    0, #linenums    0, checksum        0
004 00000000 SECT3  notype       Static       | .debug$S
    Section length  2C0, #relocs    4, #linenums    0, checksum        0
006 00000000 SECT4  notype       Static       | .debug$T
    Section length 13C0, #relocs    0, #linenums    0, checksum        0
008 00000000 SECT1  notype       Label        | $$000000
009 00000008 SECT1  notype       Label        | @C0001

By the way, this is also connected to an unexpected error "Error A2056: Symbol already defined: @C0001" when I use:

my MACRO cond:REQ
 .IF cond
    nop 
 .ENDIF
ENDM

.code
 mov eax, ebx
 my eax==1
 add eax, ecx
@C0001:
 nop
end