Line info can be wrong in GDB

[ire4ever1190]

Nim Version

Nim Compiler Version 2.3.1 [Linux: amd64] Compiled at 2025-02-28 Copyright (c) 2006-2025 by Andreas Rumpf

git hash: 7e8a650729e9434574c46350aece7609e5465253 active boot switches: -d:release

Description

Line info can be off in GDB and point to a different line. Basic example

proc foo() =
  let x = @[1, 2, 3]
  echo x[4]
# Shows here instead
foo()

Compiling that and breaking with b sysFatal it says the line that caused the error is the comment and not the array access line.

Current Output

(gdb) where
#0  _ZN6system8sysFatalE8typeDescIN10exceptions11IndexDefectEE4sinkI6stringE (message_p1="index 4 not in 0 .. 2") at /home/user/.choosenim/toolchains/nim-hashdevel/lib/system/fatal.nim:52
#1  0x000055555556227e in raiseIndexError2 (i_p0=i_p0@entry=4, n_p1=n_p1@entry=2) at /home/user/.choosenim/toolchains/nim-hashdevel/lib/system/chcks.nim:28
#2  0x0000555555562da3 in _ZN4test3fooE () at /home/user/Documents/projects/Nim/test.nim:4
#3  0x0000555555562e75 in NimMainModule () at /home/user/Documents/projects/Nim/test.nim:5
#4  0x0000555555562eaf in NimMainInner () at /home/user/Documents/projects/Nim/test.nim:25
#5  0x0000555555562ec2 in NimMain () at /home/user/Documents/projects/Nim/test.nim:31
#6  0x0000555555562ee4 in main (argc=<optimized out>, args=<optimized out>, env=<optimized out>) at /home/user/Documents/projects/Nim/test.nim:39

Expected Output

(gdb) where
#0  _ZN6system8sysFatalE8typeDescIN10exceptions11IndexDefectEE4sinkI6stringE (message_p1="index 4 not in 0 .. 2") at /home/user/.choosenim/toolchains/nim-hashdevel/lib/system/fatal.nim:52
#1  0x000055555556227e in raiseIndexError2 (i_p0=i_p0@entry=4, n_p1=n_p1@entry=2) at /home/user/.choosenim/toolchains/nim-hashdevel/lib/system/chcks.nim:28
#2  0x0000555555562da3 in _ZN4test3fooE () at /home/user/Documents/projects/Nim/test.nim:3
#3  0x0000555555562e75 in NimMainModule () at /home/user/Documents/projects/Nim/test.nim:5
#4  0x0000555555562eaf in NimMainInner () at /home/user/Documents/projects/Nim/test.nim:25
#5  0x0000555555562ec2 in NimMain () at /home/user/Documents/projects/Nim/test.nim:31
#6  0x0000555555562ee4 in main (argc=<optimized out>, args=<optimized out>, env=<optimized out>) at /home/user/Documents/projects/Nim/test.nim:39

Known Workarounds

No response

Additional Information

Looking at the #line docs it says "Subsequent lines are counted from linenum.". When looking at the c source we see

#line 1401 FX_279
						nimlf_(1401, "/home/user/Documents/projects/Nim/compiler/semexprs.nim");if (nimAddInt(s, ((NI) 1), (&TM__rF9caJawfOjYTjsgLVUSGFA_3216))) {
	raiseOverflow();

so fix I am assuming is to add #line 0 to the lines after?