Got the following from solaris help doc: Generates makefile dependencies like -xM, but excludes /usr/include files. For example: more hello.c #include<stdio.h> main() { (void)printf(“hello\n”); } cc– xM hello.c hello.o: hello.c hello.o: /usr/include/stdio.h Compiling with -xM1 does not report header file dependencies: cc– xM1 hello.c hello.o: hello.c -- View this message in context: http://gcc.1065356.n5.nabble.com/what-is-the-equivalent-of-xM1-solaris-compiler-option-in-gcc-tp925198p925214.html Sent from the gcc - Help mailing list archive at Nabble.com.