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LIBSETCCFLAGS uses option -Vx.x.x in the libset.mk makefile

Question & Answer


Question

What is the the significance of the "-V2.8.1" as seen in the example "LIBSETCCFLAGS = -V2.8.1 -fno-exceptions -fno-rtti" found in the IBM® Rational® Rose RealTime® on line Help (Adapting Rational Rose RealTime for Target Environments > Porting the TargetRTS > Libset makefile?

Answer

The option is used to ensure that a specific version of the compiler is used.

For g++, -Vx.x.x ensures that the compiler version is explicitly stated. This prevents the wrong version of the compiler from being used.

Note: If the -Vx.x.x does not match the compiler installed, errors like the following may be experienced.

!> Compiling MyComponent
g++: installation problem, cannot exec `cpp0': No such file or directory
g++: file path prefix `/usr/lib/gcc-lib/i386-linux/egcs-2.91.66/' never used


If there is a problem with compiler mismatch, the TargetRTS can easily be ported to a new version. A good example of this is given in the technote Porting Rose RealTime's TargetRTS to a new minor version of a supported compiler

Note: The "-V" option might not be available for all compilers. Consult your compiler vendor's documentation for more information on this and other compiler options.

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Document Information

Modified date:
16 June 2018

UID

swg21131275

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