342 lines
9.1 KiB
Bash
342 lines
9.1 KiB
Bash
# hints/dec_osf.sh
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# * If you want to debug perl or want to send a
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# stack trace for inclusion into an bug report, call
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# Configure with the additional argument -Doptimize=-g2
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# or uncomment this assignment to "optimize":
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#
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#optimize=-g2
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#
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# If you want both to optimise and debug with the DEC cc
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# you must have -g3, e.g. "-O4 -g3", and (re)run Configure.
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#
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# * gcc can always have both -g and optimisation on.
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#
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# * debugging optimised code, no matter what compiler
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# one is using, can be surprising and confusing because of
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# the optimisation tricks like code motion, code removal,
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# loop unrolling, and inlining. The source code and the
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# executable code simply do not agree any more while in
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# mid-execution, the optimiser only cares about the results.
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#
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# * Configure will automatically add the often quoted
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# -DDEBUGGING for you if the -g is specified.
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#
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# * There is even more optimisation available in the new
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# (GEM) DEC cc: -O5 and -fast. "man cc" will tell more about them.
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# The jury is still out whether either or neither help for Perl
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# and how much. Based on very quick testing, -fast boosts
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# raw data copy by about 5-15% (-fast brings in, among other
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# things, inlined, ahem, fast memcpy()), while on the other
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# hand searching things (index, m//, s///), seems to get slower.
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# Your mileage will vary.
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#
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# * The -std is needed because the following compiled
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# without the -std and linked with -lm
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#
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# #include <math.h>
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# #include <stdio.h>
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# int main(){short x=10,y=sqrt(x);printf("%d\n",y);}
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#
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# will in Digital UNIX 3.* and 4.0b print 0 -- and in Digital
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# UNIX 4.0{,a} dump core: Floating point exception in the printf(),
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# the y has become a signaling NaN.
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#
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# * Compilation warnings like:
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#
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# "Undefined the ANSI standard macro ..."
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#
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# can be ignored, at least while compiling the POSIX extension
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# and especially if using the sfio (the latter is not a standard
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# part of Perl, never mind if it says little to you).
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#
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# If using the DEC compiler we must find out the DEC compiler style:
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# the style changed between Digital UNIX (aka DEC OSF/1) 3 and
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# Digital UNIX 4. The old compiler was originally from Ultrix and
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# the MIPS company, the new compiler is originally from the VAX world
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# and it is called GEM. Many of the options we are going to use depend
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# on the compiler style.
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# do NOT, I repeat, *NOT* take away those leading tabs
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# reset
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_DEC_uname_r=
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_DEC_cc_style=
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# set
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_DEC_uname_r=`uname -r`
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# _DEC_cc_style set soon below
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# Configure Black Magic (TM)
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case "$cc" in
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*gcc*) ;; # pass
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*) # compile something small: taint.c is fine for this.
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# the main point is the '-v' flag of 'cc'.
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case "`cc -v -I. -c taint.c -o /tmp/taint$$.o 2>&1`" in
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*/gemc_cc*) # we have the new DEC GEM CC
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_DEC_cc_style=new
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;;
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*) # we have the old MIPS CC
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_DEC_cc_style=old
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;;
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esac
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# cleanup
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rm -f /tmp/taint$$.o
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;;
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esac
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# be nauseatingly ANSI
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case "$cc" in
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*gcc*) ccflags="$ccflags -ansi"
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;;
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*) ccflags="$ccflags -std"
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;;
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esac
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# for gcc the Configure knows about the -fpic:
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# position-independent code for dynamic loading
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# we want optimisation
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case "$optimize" in
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'') case "$cc" in
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*gcc*)
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optimize='-O3' ;;
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*) case "$_DEC_cc_style" in
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new) optimize='-O4'
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ccflags="$ccflags -fprm d -ieee"
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;;
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old) optimize='-O2 -Olimit 3200' ;;
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esac
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ccflags="$ccflags -D_INTRINSICS"
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;;
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esac
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;;
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esac
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# Make glibpth agree with the compiler suite. Note that /shlib
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# is not here. That's on purpose. Even though that's where libc
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# really lives from V4.0 on, the linker (and /sbin/loader) won't
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# look there by default. The sharable /sbin utilities were all
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# built with "-Wl,-rpath,/shlib" to get around that. This makes
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# no attempt to figure out the additional location(s) searched by
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# gcc, since not all versions of gcc are easily coerced into
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# revealing that information.
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glibpth="/usr/shlib /usr/ccs/lib /usr/lib/cmplrs/cc"
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glibpth="$glibpth /usr/lib /usr/local/lib /var/shlib"
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# dlopen() is in libc
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libswanted="`echo $libswanted | sed -e 's/ dl / /'`"
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# libPW contains nothing useful for perl
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libswanted="`echo $libswanted | sed -e 's/ PW / /'`"
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# libnet contains nothing useful for perl here, and doesn't work
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libswanted="`echo $libswanted | sed -e 's/ net / /'`"
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# libbsd contains nothing used by perl that is not already in libc
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libswanted="`echo $libswanted | sed -e 's/ bsd / /'`"
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# libc need not be separately listed
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libswanted="`echo $libswanted | sed -e 's/ c / /'`"
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# ndbm is already in libc
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libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`"
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# the basic lddlflags used always
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lddlflags='-shared -expect_unresolved "*"'
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# Fancy compiler suites use optimising linker as well as compiler.
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# <spider@Orb.Nashua.NH.US>
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case "$_DEC_uname_r" in
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*[123].*) # old loader
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lddlflags="$lddlflags -O3"
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;;
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*) lddlflags="$lddlflags $optimize -msym"
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# -msym: If using a sufficiently recent /sbin/loader,
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# keep the module symbols with the modules.
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;;
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esac
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# Yes, the above loses if gcc does not use the system linker.
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# If that happens, let me know about it. <jhi@iki.fi>
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# If debugging or (old systems and doing shared)
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# then do not strip the lib, otherwise, strip.
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# As noted above the -DDEBUGGING is added automagically by Configure if -g.
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case "$optimize" in
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*-g*) ;; # left intentionally blank
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*) case "$_DEC_uname_r" in
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*[123].*)
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case "$useshrplib" in
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false|undef|'') lddlflags="$lddlflags -s" ;;
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esac
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;;
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*) lddlflags="$lddlflags -s"
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;;
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esac
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;;
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esac
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#
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# Make embedding in things like INN and Apache more memory friendly.
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# Keep it overridable on the Configure command line, though, so that
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# "-Uuseshrplib" prevents this default.
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#
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case "$_DEC_cc_style.$useshrplib" in
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new.) useshrplib="$define" ;;
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esac
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# This script UU/usethreads.cbu will get 'called-back' by Configure
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# after it has prompted the user for whether to use threads.
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cat > UU/usethreads.cbu <<'EOCBU'
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case "$usethreads" in
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$define|true|[yY]*)
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# Threads interfaces changed with V4.0.
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case "`uname -r`" in
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*[123].*)
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libswanted="$libswanted pthreads mach exc c_r"
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ccflags="-threads $ccflags"
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;;
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*)
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libswanted="$libswanted pthread exc"
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ccflags="-pthread $ccflags"
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;;
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esac
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usemymalloc='n'
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;;
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esac
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EOCBU
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#
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# Unset temporary variables no more needed.
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#
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unset _DEC_cc_style
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unset _DEC_uname_r
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#
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# History:
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#
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# perl5.004_57:
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#
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# 19-Dec-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
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#
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# * Newer Digital UNIX compilers enforce signaling for NaN without
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# -ieee. Added -fprm d at the same time since it's friendlier for
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# embedding.
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#
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# * Fixed the library search path to match cc, ld, and /sbin/loader.
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#
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# * Default to building -Duseshrplib on newer systems. -Uuseshrplib
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# still overrides.
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#
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# * Fix -pthread additions for useshrplib. ld has no -pthread option.
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#
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#
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# perl5.004_04:
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#
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# 19-Sep-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
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#
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# * libnet on Digital UNIX is for JAVA, not for sockets.
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#
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#
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# perl5.003_28:
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#
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# 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
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#
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# * Restructuring Spider's suggestions.
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#
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# * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags.
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#
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# * ld -s cannot be used in older Digital UNIXes when doing shared.
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#
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#
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# 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US>
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#
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# * -hidden removed.
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#
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# * -DSTANDARD_C removed.
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#
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# * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed)
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#
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# * odbm not in libc, only ndbm. Therefore dbm back to $libswanted.
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#
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# * -msym for the newer runtime loaders.
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#
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# * $optimize also in $lddflags.
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#
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#
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# perl5.003_27:
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#
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# 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
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#
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# * unset _DEC_cc_style and more commentary on -std.
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#
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#
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# perl5.003_26:
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#
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# 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi>
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#
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# * -std and -ansi.
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#
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#
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# perl5.003_24:
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#
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# 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
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#
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# * Fixing the note on -DDEBUGGING.
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#
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# * Note on -O5 -fast.
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#
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#
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# perl5.003_23:
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#
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# 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
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#
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# * Notes on how to do both optimisation and debugging.
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#
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#
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# 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi>
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#
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# * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm
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#
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# * Restructure the $lddlflags build.
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#
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# * $optimize based on which compiler we have.
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#
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#
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# perl5.003_22:
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#
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# 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
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#
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# * Added comments 'how to create a debugging version of perl'
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#
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# * Fixed logic of this script to prevent stripping of shared
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# objects by the loader (see ld man page for -s) is debugging
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# is set via the -g switch.
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#
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#
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# 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
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#
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# * now 'dl' is always removed from libswanted. Not only if
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# optimize is an empty string.
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#
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#
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# 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
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#
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# * Removed 'dl' from libswanted: When the FreePort binary
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# translator for Sun binaries is installed Configure concludes
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# that it should use libdl.x.yz.fpx.so :-(
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# Because the dlopen, dlclose,... calls are in the
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# C library it not necessary at all to check for the
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# dl library. Therefore dl is removed from libswanted.
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#
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#
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# 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de>
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#
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# * Set -Olimit to 3200 because perl_yylex.c got too big
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# for the optimizer.
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#
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