$ echo '' | gcc -x c - -o test.o -c
$ ld test.o -o a.out -Ttext 7C00
ld: fatal error: -Ttext: invalid option value (expected an integer): 7C00
$ ld test.o -o a.out -Ttext 0x7C00
<works>
$ ld test.o -o a.out --section-start=.text=7C00
<works>

this does not match the GNU linker (or its documentation) where it says:
  -Tbss=org
  -Tdata=org
  -Ttext=org
    Same as --section-start, with ".bss", ".data" or ".text" as the
sectionname.

  --section-start=sectionname=org
    ...  org must be a single hexadecimal integer; for compatibility with other
linkers, you may omit the leading 0x usually associated with hexadecimal
values.