Cesar Strauss <cstrauss@xxxxxxxxxxx> writes: > Consider a simple header file like: > > echo "extern int test;" > test.h > > For generating a precompiled header, I find both methods below to work: > > gcc -c test.h > gcc test.h > > If, however, I happen to use a linker flag on the command line: > > gcc -Wl,-s -c test.h > gcc -Wl,-s test.h > > then, the first method works, but the second one (without -c) gives > the following error: > > /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crt1.o: In function > _start': > /build/buildd/eglibc-2.10.1/csu/../sysdeps/i386/elf/start.S:115: > undefined reference to `main' > collect2: ld returned 1 exit status > > Is this supposed to work? No. Normally if you compile a .h file, gcc will not invoke the linker. Also, when you use the -c option, gcc will not invoke the linker. However, when you use an explicit -Wl option, and you do not use -c, then gcc will invoke the linker, and running the linker on a precompiled header does not work. Ian
