Groups > comp.os.ms-windows.programmer.nt.kernel-mode > #25

Is memcmp an unsolved symbol in NT kernel driver even if compiled with /Oi?

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From	xmllmx <xmllmx@gmail.com>
Newsgroups	comp.os.ms-windows.programmer.nt.kernel-mode
Subject	Is memcmp an unsolved symbol in NT kernel driver even if compiled with /Oi?
Date	Sat, 26 May 2012 13:04:03 -0700 (PDT)
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Code Sample 1:

#include <ntifs.h>

NTSTATUS DriverEntry(PDRIVER_OBJECT param1, PUNICODE_STRING param2)
{
	char s1[] = "Hello";
	char s2[] = "World";

	int n = memcmp(s1, s2, 5);

	return 0;
}

WDK compiler reports: error LNK2019: unsolved extern symbol _memcmp referenced in function _DriverEntry@8

However, if I modify a bit the code as follows, then the compiler will accept it.

Code Sample 2:

#include <ntifs.h>

NTSTATUS DriverEntry(PDRIVER_OBJECT param1, PUNICODE_STRING param2)
{
	char s1[] = "Hello";
	char s2[] = "World";

	memcmp(s1, s2, 5);

	return 0;
}

Why?

Thanks in advance!

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Thread

Is memcmp an unsolved symbol in NT kernel driver even if compiled with /Oi? xmllmx <xmllmx@gmail.com> - 2012-05-26 13:04 -0700
  Re: Is memcmp an unsolved symbol in NT kernel driver even if compiled with /Oi? "Don Burn" <burn@windrvr.com> - 2012-05-26 20:19 +0000
    Re: Is memcmp an unsolved symbol in NT kernel driver even if compiled with /Oi? xmllmx <xmllmx@gmail.com> - 2012-05-26 13:37 -0700
      Re: Is memcmp an unsolved symbol in NT kernel driver even if compiled with /Oi? Tim Roberts <timr@probo.com> - 2012-05-27 18:52 -0700

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