$ cat test.asm
%ifdef _MAP
 [map all _MAP]
%endif

section F23456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
$ nasm -v
NASM version 2.15rc0 compiled on Dec 30 2018
$ nasm test.asm -o test.bin -l test.lst
$ nasm test.asm -o test.bin -l test.lst -D_MAP=test.map
^C
$ head --bytes 1536 test.map

- NASM Map file ---------------------------------------------------------------

Source file:  test.asm
Output file:  test.bin

-- Program origin -------------------------------------------------------------

00000000

-- Sections (summary) ---------------------------------------------------------

Vstart            Start             Stop              Length    Class     Name
               0                 0                 0  00000000  progbits  .text
               0                 0                 0  00000000  progbits  F23456789012345678901234567890123456789012345678901234567890123456789012345678901234567890

-- Sections (detailed) --------------------------------------------------------

---- Section .text ------------------------------------------------------------

class:     progbits
length:                   0
start:                    0
align:     not defined
follows:   not defined
vstart:                   0
valign:    not defined
vfollows:  not defined

---- Section F23456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------$
$ /usr/bin/nasm -v
NASM version 2.12.01
$ /usr/bin/nasm test.asm -o test.bin -l test.lst
$ /usr/bin/nasm test.asm -o test.bin -l test.lst -D_MAP=test.map
^C
$ head --bytes 1536 test.map

- NASM Map file ---------------------------------------------------------------

Source file:  test.asm
Output file:  test.bin

-- Program origin -------------------------------------------------------------

00000000

-- Sections (summary) ---------------------------------------------------------

Vstart            Start             Stop              Length    Class     Name
               0                 0                 0  00000000  progbits  .text
               0                 0                 0  00000000  progbits  F23456789012345678901234567890123456789012345678901234567890123456789012345678901234567890

-- Sections (detailed) --------------------------------------------------------

---- Section .text ------------------------------------------------------------

class:     progbits
length:                   0
start:                    0
align:     not defined
follows:   not defined
vstart:                   0
valign:    not defined
vfollows:  not defined

---- Section F23456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------$
$