Annotation of gforth/configure.in, revision 1.2

1.1       anton       1: dnl Process this file with autoconf to produce a configure script.
                      2: AC_INIT(engine.c)
                      3: 
                      4: AC_ARG_ENABLE(force-reg,
                      5: [  --enable-force-reg    Use explicit register declarations if they appear in
                      6:                          the machine.h file. This can cause a good speedup,
                      7:                          but also incorrect code with some gcc versions on
                      8:                          some processors (default disabled).],
                      9: 
                     10: AC_DEFINE(FORCE_REG))
                     11: dnl this is not quite according to the autoconf manual, it causes a replacement
                     12: AC_ARG_ENABLE(direct-threaded,
                     13: [  --enable-direct-threaded    Force direct threading. This may not work on
                     14:                                some machines and may cause slowdown on others.
                     15:                                (default processor-dependent)],
                     16: AC_DEFINE(DIRECT_THREADED))
                     17: AC_ARG_ENABLE(indirect-threaded,
                     18: [  --enable-indirect-threaded  Force indirect threading. This can cause a
                     19:                                slowdown on some machines.
                     20:                                (default processor-dependent)],
                     21: AC_DEFINE(INDIRECT_THREADED))
                     22: 
                     23: #terminology is a bit unusual here: The host is the system on which
                     24: #gforth will run; the system on which configure will run is the `build'
                     25: AC_CANONICAL_HOST
                     26: case "$host_cpu" in
                     27:        hppa*)
                     28:                mach_h=hppa
                     29:                ;;
                     30:        sparc*)
                     31:                mach_h=sparc
                     32:                ;;
                     33:        i386|i486|i586)
                     34:                mach_h=386
                     35:                #!! direct/indirect threading switch
                     36:                #!! -m486 flag
                     37:                ;;
                     38:        m68*)
                     39:                mach_h=m68k
                     40:                ;;
                     41:        mips*)
                     42:                mach_h=mips
                     43:                #!! link text and data segment into the same 256M region!
                     44:                #!! does cacheflush work on OSs other than Ultrix?
                     45:                ;;
                     46:        *)
                     47:                echo "No direct threading support for $host_cpu, using indirect threading."
                     48:                echo "Using a generic 32-bit machine description. It will only work if char * AND"
                     49:                echo "long values have 32 bits."
                     50:                echo "I'll assume that C floats and doubles are represented by IEEE single and"
                     51:                echo "double numbers. If this is not so, SF@ etc. will not work correctly."
                     52:                mach_h=32bit
                     53: esac
                     54: 
                     55: dnl Now a little support for DOS/DJGCC
                     56: AC_SUBST(MAKE_EXE)
                     57: MAKE_EXE=""
                     58: 
                     59: dnl copy commands for systems that don't have links
                     60: AC_SUBST(LINK_KERNL32L)
                     61: LINK_KERNL32L=""
                     62: AC_SUBST(LINK_KERNL32B)
                     63: LINK_KERNL32B=""
                     64: 
                     65: #if test $host_os=dos
                     66: #then
                     67: #  echo Configuring for DOS!!!
                     68: #  MAKE_EXE="coff2exe gforth"
                     69: #  LINK_KERNL32L='$(CP) kernl32l.fi gforth.fi'
                     70: #fi
                     71: 
                     72: dnl the following macro produces a warning with autoconf-2.1
                     73: AC_C_BIGENDIAN
                     74: dnl ac_cv_c_bigendian is an undocumented variable of autoconf-2.1
                     75: if test $ac_cv_c_bigendian = yes; then
                     76:   bytesex=b
                     77: else
                     78:   bytesex=l
                     79: fi
                     80: 
                     81: dnl Checks for programs.
                     82: AC_PROG_LN_S
                     83: AC_PROG_INSTALL
                     84: 
                     85: dnl Checks for library functions
1.2     ! anton      86: dnl This check is just for making later checks link with libm.
        !            87: dnl using sin here is no good idea since it is built-into gcc and typechecked
        !            88: AC_CHECK_LIB(m,asin)
1.1       anton      89: AC_FUNC_MEMCMP
                     90: AC_REPLACE_FUNCS(memmove strtoul)
                     91: AC_CHECK_FUNC(getopt_long,getop_long="",getopt_long="getopt.o getopt1.o")
                     92: AC_SUBST(getopt_long)
1.2     ! anton      93: AC_CHECK_FUNCS(rint expm1 log1p)
1.1       anton      94: AC_REPLACE_FUNCS(ecvt)
                     95: dnl No check for select, because our replacement is no good under
                     96: dnl anything but DOS
                     97: 
                     98: dnl autoconf requires (implicitly) that AC_LINK_FILES is used only once
                     99: AC_LINK_FILES(${mach_h}.h kernl32${bytesex}.fi,machine.h gforth.fi)
                    100: AC_OUTPUT(Makefile)
                    101: 

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