CODEWITHSUNDEEP
c++windowsvisual-studiocl
Shane Bishop
Shane Bishop

Reputation: 4790

How do you correctly use /GUARD:CF MSVC flag?

I am trying to use the /GUARD:CD MSVC flag. From the documentation, it says

The /GUARD:CF option must be specified to both the compiler and linker

The documentation also says that /GUARD:CF requires the /DYNAMICBASE option to also be set.

However, when I try to compile, I see warnings for unrecognized options:

cl -c /W3 /O2 /EHsc /MP /Zi /nologo /MD /Zi /DUNICODE /D_UNICODE /D_CRT_SECURE_NO_DEPRECATE /LD -Isrc -Iimport/include -D_WINDOWS -D_FILE_OFFSET_BITS=64 -DWXUSINGDLL /GS /DYNAMICBASE /GUARD:CF    /Fo: redacted.cpp.obj redacted.cpp
cl : Command line warning D9002 : ignoring unknown option '/GU'
cl : Command line warning D9002 : ignoring unknown option '/GD'
cl : Command line warning D9002 : ignoring unknown option '/G:'
cl : Command line warning D9002 : ignoring unknown option '/GC'

At first I thought maybe I accidentally introduced non-printable characters in my text editor, but I verified with cat --show-nonprinting that that was not the case.

How can I correctly pass /GUARD:CF to the MSVC cl compiler so that it recognizes it?

Upvotes: 1

Views: 1405

Answers (2)

3CxEZiVlQ
3CxEZiVlQ

Reputation: 38824

The page you linked is a part of the manual to MSVC linker options. Linker options are case-insensitive. That page has a link to the manual to MSVC compiler options:

When source code is compiled by using the /guard:cf option.

Compiler options are case-sensitive. The proper cl invocation

cl -c /W3 /O2 /EHsc /MP /Zi /nologo /MD /Zi /DUNICODE /D_UNICODE /D_CRT_SECURE_NO_DEPRECATE /LD -Isrc -Iimport/include -D_WINDOWS -D_FILE_OFFSET_BITS=64 -DWXUSINGDLL /GS /DYNAMICBASE /guard:cf  /Fo: redacted.cpp.obj redacted.cpp

Just to know. Disabling guard is different for the linker and the compiler: /GUARD:NO and /guard:cf-.

Upvotes: 2

Adrian Mole
Adrian Mole

Reputation: 51874

The documentation you linked (which is about the linker /GUARD option) is rather misleading, but the answer is buried in there, if you look really hard:

For the compiler, the command-line option needs to be in lowercase (but the linker seems to accept either uppercase or lowercase).

So, use /guard:cf instead of /GUARD:CF on the cl command-line.

From the linked document:

When source code is compiled by using the /guard:cf option, …

And, on the page that the /guard:cf links to, the switch is only ever given in lowercase.

Upvotes: 1

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