I've just decided to try to learn how to work with perl XS. I am using VC++ 9.0 for Win32 (just downloaded). I'm using the example given by JamesNC in a previous post -- http://www.perlmonks.org/?node_id=510773 -- and have my own set of problems.

It appears that my compile ran okay, but the makefile is missing something that I need for the link to complete. I'm using the same source as JamesNC, I just named it 'simple.c', and I'm getting a link error message regarding the missing boot_simple symbol. That message is 5-6 lines from the bottom.

Can anyone see what is missing from the following nmake output (note that it was scraped off my screen)? Thanks. 

        D:\Perl\bin\perl.exe D:\Perl\lib\ExtUtils\xsubpp  -typemap D:\
+Perl\lib\E
xtUtils\typemap  simple.xs > simple.xsc && D:\Perl\bin\perl.exe -MExtU
+tils::Comm
and -e mv simple.xsc simple.c
Please specify prototyping behavior for simple.xs (see perlxs manual)
        cl -c  -I.  -nologo -GF -W3 -MD -Zi -DNDEBUG -O1 -DWIN32 -D_CO
+NSOLE -DNO
_STRICT -DHAVE_DES_FCRYPT -DNO_HASH_SEED -DUSE_SITECUSTOMIZE -DPRIVLIB
+_LAST_IN_I
NC -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSV
+CRT_READFI
X -MD -Zi -DNDEBUG -O1    -DVERSION=\"0.01\"  -DXS_VERSION=\"0.01\"  "
+-ID:\Perl\
lib\CORE"   simple.c
simple.c
        link -out:blib\arch\auto\simple\simple.dll -dll -nologo -nodef
+aultlib -d
ebug -opt:ref,icf  -libpath:"D:\Perl\lib\CORE"  -machine:x86 simple.ob
+j   D:\Per
l\lib\CORE\perl58.lib oldnames.lib kernel32.lib user32.lib gdi32.lib w
+inspool.li
b  comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib  netap
+i32.lib uu
id.lib ws2_32.lib mpr.lib winmm.lib  version.lib odbc32.lib odbccp32.l
+ib msvcrt.
lib -def:simple.def
simple.def : error LNK2001: unresolved external symbol boot_simple
simple.def : error LNK2001: unresolved external symbol boot_simple
blib\arch\auto\simple\simple.lib : fatal error LNK1120: 2 unresolved e
+xternals
NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio 
+9.0\VC\BIN
\link.EXE"' : return code '0x460'
Stop.

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In reply to VC++ and XS -- again by TomKane

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