gas/aclocal.m4

   1 dnl
   2 dnl This ugly hack is needed because the Cygnus configure script won't
   3 dnl tell us what CC is going to be, and "cc" isn't always right.  (The
   4 dnl top-level Makefile will always override anything we choose here, so
   5 dnl the usual gcc/cc selection is useless.)
   6 dnl
   7 dnl It knows where it is in the tree; don't try using it elsewhere.
   8 dnl
   9 undefine([AC_PROG_CC])dnl
  10 define(AC_PROG_CC,
  11 [AC_BEFORE([$0], [AC_PROG_CPP])dnl
  12 AC_PROVIDE([$0])dnl
  13 dnl
  14 dnl The ugly bit...
  15 dnl
  16 AC_MSG_CHECKING([for CC])
  17 dnl Don't bother with cache.
  18 test -z "$CC" && CC=`egrep '^CC *=' ../Makefile | tail -1 | sed 's/^CC *= *//'`
  19 test -z "$CC" && CC=cc
  20 AC_MSG_RESULT(setting CC to $CC)
  21 AC_SUBST(CC)
  22 dnl
  23 dnl
  24 # Find out if we are using GNU C, under whatever name.
  25 cat > conftest.c <<EOF
  26 #ifdef __GNUC__
  27   yes
  28 #endif
  29 EOF
  30 ${CC-cc} -E conftest.c > conftest.out 2>&1
  31 if egrep yes conftest.out >/dev/null 2>&1; then
  32   GCC=yes
  33 else
  34   GCC=
  35 fi
  36 rm -f conftest*
  37 ])dnl