It appears that icc14 has a bug where it doesn't understand _Pragma() if you pass in a preprocessed .ii file, see below & attached pragma.cpp file.
This breaks distcc builds, as it sends the preprocessed file to the remote machine for compilation.
I don't see this bug with icc13, gcc 4.7, gcc 4.8 or clang. I do see this in icc14.0.2 and icc14.0.3. The issue only occurs with _Pragma; #pragma works but we can't use it in our code, as we need to use this macro to support multiple compilers.
$ icc14.0.3 pragma.cpp -c -O0 -Wall -E -o p_icc14.ii
$ icc14.0.3 p_icc14.ii -c
pragma.cpp(3): error #77: this declaration has no storage class or type specifier
_Pragma("warning(disable:592)")
^
pragma.cpp(3): error: a value of type "const char *" cannot be used to initialize an entity of type "int"
_Pragma("warning(disable:592)")
^
pragma.cpp(9): error: expected a ";"
int foo() {
^
pragma.cpp(13): warning #12: parsing restarts here after previous syntax error
compilation aborted for p_icc14.ii (code 2)
