bfd/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 AC_DEFUN(AC_PROG_CC,
  11 [AC_BEFORE([$0], [AC_PROG_CPP])dnl
  12 dnl
  13 dnl The ugly bit...
  14 dnl
  15 AC_MSG_CHECKING([for CC])
  16 dnl Don't bother with cache.
  17 test -z "$CC" && test -r ../Makefile && CC=`egrep '^CC *=' ../Makefile | tail -1 | sed 's/^CC *= *//'`
  18 test -z "$CC" && CC=cc
  19 AC_MSG_RESULT(setting CC to $CC)
  20 AC_SUBST(CC)
  21 dnl
  22 dnl Find out if we are using GNU C, under whatever name.
  23 dnl The semicolon is to pacify NeXT's syntax-checking cpp.
  24 cat > conftest.c <<EOF
  25 #ifdef __GNUC__
  26   yes;
  27 #endif
  28 EOF
  29 if ${CC-cc} -E conftest.c 2>&AC_FD_CC | egrep yes >/dev/null 2>&1; then
  30   GCC=yes
  31   if test "${CFLAGS+set}" != set; then
  32     echo 'void f(){}' > conftest.c
  33     if test -z "`${CC-cc} -g -c conftest.c 2>&1`"; then
  34       CFLAGS="-g -O"
  35     else
  36       CFLAGS="-O"
  37     fi
  38   fi
  39 else
  40   GCC=
  41   test "${CFLAGS+set}" = set || CFLAGS="-g"
  42 fi
  43 rm -f conftest*
  44 ])dnl
  45 dnl