--- gforth/configure.in 2002/12/15 17:38:51 1.90 +++ gforth/configure.in 2002/12/24 14:47:23 1.92 @@ -24,13 +24,16 @@ dnl We use some automake macros here, dnl but don't use automake for creating Makefile.in AM_INIT_AUTOMAKE(gforth,0.5.9-20020901) #snapshots have numbers major.minor.release-YYYYMMDD -#note that lexicographic ordering bust be heeded. +#note that lexicographic ordering must be heeded. #I.e., 0.4.1-YYYYMMDD must not exist before 0.4.1! UPDATED="1 September 2002" AC_SUBST(UPDATED) AM_CONFIG_HEADER(engine/config.h) #AM_CYGWIN32 +#default setting that may be changed later: +no_dynamic_default=0 + AC_ARG_ENABLE(force-reg, [ --enable-force-reg Use explicit register declarations if they appear in the machine.h file. This can cause a good speedup, @@ -59,21 +62,20 @@ CFLAGS=$CFLAGS AC_PROG_CC -if test "$GCC" = "yes" -then - echo "Fine, gcc is available" -else - cat <<'EOF' -Gforth requires GCC-2.0 or higher (it uses GNU C extensions). -It does not work with other C compilers. Please install the GNU C compiler, -and try again (or search for a binary distribution for your platform). -EOF - exit 1 -fi +test "$GCC" = "yes" || AC_MSG_ERROR(Gforth uses GNU C extensions and requires GCC 2.0 or higher) AC_SUBST(CC) AC_SUBST(DEBUGFLAG) +AC_MSG_CHECKING(gcc version) +gcc_version=`$CC -v 2>&1|grep 'gcc version'|sed 's/.*gcc version //'` +AC_MSG_RESULT($gcc_version) +if expr "$gcc_version" \> 3.0.4 >/dev/null && expr "$gcc_version" \< 3.2.1 >/dev/null +then + no_dynamic_default=1 + AC_MSG_WARN(Disabling dynamic native code generation by default (speed penalty factor ~2)) +fi + dnl the following macro produces a warning with autoconf-2.1 AC_CHECK_SIZEOF(char *) case "$ac_cv_sizeof_char_p" in @@ -94,6 +96,7 @@ AC_CHECK_SIZEOF(int) AC_CHECK_SIZEOF(long) AC_CHECK_SIZEOF(long long) +AC_MSG_CHECKING([for a C type for cells]) ac_cv_int_type_cell=none case "$ac_cv_sizeof_char_p" in $ac_cv_sizeof_int) @@ -112,13 +115,10 @@ case "$ac_cv_sizeof_char_p" in ac_cv_int_type_cell="long long" ;; esac -if test "$ac_cv_int_type_cell" != int; then - echo "So, sizeof(pointer)!=sizeof(int); looks like a DOS C compiler to me." - echo "Since you don't have a proper C on this machine, that's one more reason" - echo "to use Forth;-)" -fi +AC_MSG_RESULT($ac_cv_int_type_cell) AC_DEFINE_UNQUOTED(CELL_TYPE,$ac_cv_int_type_cell,[an integer type that is as long as a pointer]) +AC_MSG_CHECKING([for a C type for double-cells]) ac_cv_int_type_double_cell=none case `expr 2 '*' "$ac_cv_sizeof_char_p"` in $ac_cv_sizeof_short) @@ -134,15 +134,13 @@ case `expr 2 '*' "$ac_cv_sizeof_char_p"` ac_cv_int_type_double_cell="long long" ;; esac +AC_MSG_RESULT($ac_cv_int_type_double_cell) if test "$ac_cv_int_type_double_cell" = none; then - echo "Emulating double-cell arithmetic. This may be slow." - echo "If you find this unacceptable, ask the GCC maintainers to provide proper" - echo 'long longs for your machine (the GCC manual states that they \"are twice as' - echo "long as \`long int\'\")." + AC_MSG_WARN([Emulating double-cell arithmetic. This may be slow.]) AC_LIBOBJ(dblsub) AC_DEFINE(BUGGY_LONG_LONG,,[define this if there is no working DOUBLE_CELL_TYPE on your machine]) else - AC_DEFINE_UNQUOTED(DOUBLE_CELL_TYPE,$ac_cv_int_type_double_cell,[an integer type that is twice as long as a pointer]) + AC_DEFINE_UNQUOTED(DOUBLE_CELL_TYPE,$ac_cv_int_type_double_cell,[an integer type that is twice as long as a pointer]) fi AC_MSG_CHECKING([whether the linker accepts -export-dynamic]) @@ -196,6 +194,21 @@ case "$host_cpu" in ;; mips*) machine=mips + #dynamic native code has the following problems on MIPS: + # + #1) J/JAL seems relocatable, but is are only + #relocatable within a 256MB-segment. While we try to + #get the linker to arrange this, there is no guarantee + #that this will succeed (and if the user uses a lot of + #memory, it is likely to fail). + # + #2) The way we generate dynamic native code may + #violate MIPS architectural restrictions (in + #particular, the delay slots of LW, MFLO, etc.) + # + #Therefore we disable dynamic native code by default: + no_dynamic_default=1 + AC_MSG_WARN(Disabling dynamic native code generation by default (speed penalty factor ~2)) #link text and data segment into the same 256M region! AC_MSG_CHECKING([whether the linker accepts -T]) OLDLDFLAGS=$LDFLAGS @@ -203,9 +216,6 @@ case "$host_cpu" in AC_TRY_LINK(,,ac_link_mips_t=yes,ac_link_mips_t=no) test $ac_link_mips_t = yes||LDFLAGS=$OLDLDFLAGS AC_MSG_RESULT($ac_link_mips_t) - fixme #dynamically generated code should be in the same 256MB - # region as the text segment; no indirect threading necessary - test $ac_link_mips_t = yes||(echo cannot link text and data into same 256M region, using indirect threading; AC_DEFINE(INDIRECT_THREADED,,[Define if you want to force an indirect threaded code implementation])) AC_MSG_CHECKING([whether the linker accepts -D]) OLDLDFLAGS=$LDFLAGS LDFLAGS="$LDFLAGS -Xlinker -D -Xlinker 10400000" @@ -224,10 +234,9 @@ case "$host_cpu" in AC_CHECK_FUNC(_sync_cache_range,true,AC_LIBOBJ(../arch/power/_sync_cache_range)) ;; *) - echo "Using a generic machine description." - echo "I'll assume that C floats and doubles are represented by IEEE single and" - echo "double numbers. If this is not so, SF@ etc. will not work correctly." - echo "FLUSH-ICACHE will do nothing, so END-CODE may not work properly!" + AC_MSG_WARN([Using a generic machine description]) + AC_MSG_WARN([Assuming C floats and doubles are IEEE floats and doubles (for SF@ DF@ SF! DF!)]) + AC_MSG_WARN([FLUSH-ICACHE will do nothing, so END-CODE may not work properly!]) machine=generic esac AC_SUBST(host) @@ -307,6 +316,41 @@ else KERNEL="kernl16l.fi kernl16b.fi kernl32l.fi kernl32b.fi kernl64l.fi kernl64b.fi" fi +#check how to do asm(".skip 16") +AC_MSG_CHECKING([if and how we can waste code space]) +skipcode=no +for i in ".skip 16" ".block 16" ".org .+16" ".=.+16" ".space 16" +do + AC_TRY_RUN( +int foo(int); +main() +{ + exit(foo(0)!=16); +} +int foo(int x) +{ + if (x) { + label1: + asm("$i"); + label2: + } + return (&&label2)-(&&label1); +} + ,skipcode=$i; break + ,,) +done +AC_MSG_RESULT($skipcode) +if test "$skipcode" = no +then + no_dynamic_default=1 + AC_DEFINE_UNQUOTED(SKIP16,((void)0),statement for skipping 16 bytes) + AC_MSG_WARN(Disabling dynamic native code generation by default (speed penalty factor ~2)) +else + AC_DEFINE_UNQUOTED(SKIP16,asm("$skipcode"),statement for skipping 16 bytes) +fi + +AC_DEFINE_UNQUOTED(NO_DYNAMIC_DEFAULT,$no_dynamic_default,default value for no_dynamic) + dnl Checks for programs. AC_PROG_LN_S dnl AM_PROG_INSTALL #performed by AM_INIT_AUTOMAKE @@ -323,7 +367,7 @@ fi AC_REPLACE_FUNCS(memmove strtoul pow10 strerror strsignal atanh) AC_CHECK_FUNCS(dlopen sys_siglist getrusage) AC_DECL_SYS_SIGLIST -AC_CHECK_FUNC(getopt_long,true,AC_LIBOBJ(getopt.$ac_objext getopt1)) +AC_CHECK_FUNC(getopt_long,true,AC_LIBOBJ(getopt); AC_LIBOBJ(getopt1)) AC_CHECK_FUNCS(expm1 log1p) AC_REPLACE_FUNCS(rint ecvt) dnl No check for select, because our replacement is no good under