avoid triggering gcc's -Wunsafe-loop-optimizations in EDSP

[apt.git] / buildlib / tools.m4

diff --git a/buildlib/tools.m4 b/buildlib/tools.m4
index de9c8a1033a07ce68a0047799f2fbc93a3e99a20..433d5ca329d7d63609fc4539ac6b74bcefe5b5ec 100644 (file)
--- a/buildlib/tools.m4
+++ b/buildlib/tools.m4
@@ -1,4 +1,4 @@
-AC_DEFUN(ah_HAVE_GETCONF,
+AC_DEFUN([ah_HAVE_GETCONF],
        [AC_ARG_WITH(getconf,
                [  --with-getconf          Enable automagical buildtime configuration],
                [if test "$withval" = "yes"; then
@@ -13,35 +13,50 @@ AC_DEFUN(ah_HAVE_GETCONF,
        AC_SUBST(GETCONF)
 ])
 
-AC_DEFUN(ah_NUM_CPUS,
+dnl ah_GET_CONF(variable, value ..., [default])
+AC_DEFUN([ah_GET_GETCONF],
        [AC_REQUIRE([ah_HAVE_GETCONF])
-       AC_MSG_CHECKING([number of cpus])
+       if test ! -z "$GETCONF";then
+               old_args="[$]@"
+               set -- $2
+               while eval test -z \"\$$1\" -a ! -z \"[$]1\";do
+                       eval $1=`$GETCONF "[$]1" 2>/dev/null`
+                       shift
+               done
+       fi
+       if eval test -z \"\$$1\" -o \"\$$1\" = "-1";then
+               eval $1="$3"
+       fi
+])
+AC_DEFUN([ah_NUM_CPUS],
+       [AC_MSG_CHECKING([number of cpus])
        AC_ARG_WITH(cpus,
                [  --with-cpus             The number of cpus to be used for building(see --with-procs, default 1)],
-               [if test "$withval" = "yes"; then
-                       if test "$GETCONF";then
-                               NUM_CPUS=`$GETCONF _NPROCESSORS_ONLN 2>/dev/null`
-                       else
-                               NUM_CPUS=1
-                       fi
+               [
+               if test "$withval" = "yes"; then
+                       ah_GET_GETCONF(NUM_CPUS, SC_NPROCESSORS_ONLN _NPROCESSORS_ONLN, 1)
                elif test ! "$withval" = "no";then
                        NUM_CPUS=$withval
-               fi],
-               [if test "$GETCONF";then
-                       NUM_CPUS=`$GETCONF _NPROCESSORS_ONLN 2>/dev/null`
-               else
+               elif test "$withval" = "no";then
                        NUM_CPUS=1
-               fi]
+               fi],
+               [ah_GET_GETCONF(NUM_CPUS, SC_NPROCESSORS_ONLN _NPROCESSORS_ONLN, 1)]
        )
+       ah_NUM_CPUS_msg="$NUM_CPUS"
+       if test "$NUM_CPUS" = "0"; then
+               # broken getconf, time to bitch.
+               ah_NUM_CPUS_msg="found 0 cpus.  Has someone done a lobotomy?"
+               NUM_CPUS=1
+       fi
        if test $NUM_CPUS = 1 ;then
                default_PROC_MULTIPLY=1
        else
                default_PROC_MULTIPLY=2
        fi
-       AC_MSG_RESULT([$NUM_CPUS])
+       AC_MSG_RESULT([$ah_NUM_CPUS_msg])
        AC_SUBST(NUM_CPUS)
 ])
-AC_DEFUN(ah_PROC_MULTIPLY,
+AC_DEFUN([ah_PROC_MULTIPLY],
        [AC_REQUIRE([ah_NUM_CPUS])
        AC_MSG_CHECKING([processor multiplier])
        AC_ARG_WITH(proc-multiply,
@@ -57,19 +72,39 @@ AC_DEFUN(ah_PROC_MULTIPLY,
        AC_SUBST(PROC_MULTIPLY)
 ])
 
-AC_DEFUN(ah_NUM_PROCS,
+AC_DEFUN([ah_NUM_PROCS],
        [AC_REQUIRE([ah_PROC_MULTIPLY])
        AC_REQUIRE([ah_NUM_CPUS])
        AC_MSG_CHECKING([number of processes to run during make])
        AC_ARG_WITH(procs,
                [  --with-procs            The number of processes to run in parallel during make(num_cpus * multiplier).],
                [if test "$withval" = "yes"; then
-                       let "NUM_PROCS=$NUM_CPUS*$PROC_MULTIPLY"
+                       NUM_PROCS=`expr $NUM_CPUS \* $PROC_MULTIPLY`
                elif test ! "$withval" = "no";then
                        NUM_PROCS=$withval
                fi],
-               [let "NUM_PROCS=$NUM_CPUS*$PROC_MULTIPLY"]
+               [NUM_PROCS=`expr $NUM_CPUS \* $PROC_MULTIPLY`]
        )
        AC_MSG_RESULT([$NUM_PROCS])
        AC_SUBST(NUM_PROCS)
 ])
+
+AC_DEFUN([ah_GCC3DEP],[
+       AC_MSG_CHECKING(if $CXX -MD works)
+       touch gcc3dep.cc
+       ${CXX-c++} -MD -o gcc3dep_test.o -c gcc3dep.cc
+       rm -f gcc3dep.cc gcc3dep_test.o
+       if test -e gcc3dep.d; then
+               rm -f gcc3dep.d
+               GCC_MD=input
+               GCC3DEP=
+       elif test -e gcc3dep_test.d; then
+               rm -f gcc3dep_test.d
+               GCC_MD=output
+               GCC3DEP=yes
+       else
+               AC_MSG_ERROR(no)
+       fi
+       AC_MSG_RESULT([yes, for $GCC_MD])
+       AC_SUBST(GCC3DEP)
+])