c - Impossible constraint in ‘asm’ error and indirect call without "*" warning -


in seoul virtual machine monitor project, encountered inline assembler code

asm volatile ("call %p0; 1:" : : "i"(foo))

which compiles , runs when optimized -o2; fails compile -o0 optimization, yielding error:

error: impossible constraint in ‘asm’

foo 32 bits int taken immediate value call instruction.

when googled, this suggests me replace "i" constraint "ic", did; , code compile :

warning: indirect call without « * »

how can avoid warning?

nb:

  • gcc version 4.9.2
  • asm %p modifier prevent gcc append $ in front of int value. generate "call foo" instead of "call $foo".


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