This commit ties the new DSO code (crypto/dso/) into the build for a

variety of platforms. A few are missing, and they will be added in
eventually, but as this is new stuff, it was better to not break lots of
platforms in one go that we can't easily test. The changes to "Configure"
should illustrate how to add support to other systems if you feel like
having a go.

NB: I'll add something shortly to allow you to add "dlfcn.h" support on
those platforms that don't have (or need) a dlfcn.h header file. (The
symbol for Configure will probably by "dlfcn_no_h").

Thanks to Richard Levitte, who is responsible for the dso_dl.c support,
understanding the trickier aspects of the build process, and giving great
feedback on everything else.

[Don't use this stuff if you're easily offended by changes to the
interface or behaviour - it's still work in progress.]

PR:

14 files changed, 92 insertions, 51 deletions

diff --git a/Configure b/Configure
index 273b7b75aa..436af8dad7 100755
--- a/Configure
+++ b/Configure
@@ -86,7 +86,7 @@ my $x86_bsdi_asm="asm/bn86bsdi.o asm/co86bsdi.o:asm/dx86bsdi.o asm/yx86bsdi.o:as
 # -DB_ENDIAN slows things down on a sparc for md5, but helps sha1.
 # So the md5_locl.h file has an undef B_ENDIAN if sun is defined
 
-#config-string	$cc : $cflags : $unistd : $thread_cflag : $lflags : $bn_ops : $bn_obj : $des_obj : $bf_obj : $md5_obj : $sha1_obj : $cast_obj : $rc4_obj : $rmd160_obj : $rc5_obj
+#config-string	$cc : $cflags : $unistd : $thread_cflag : $lflags : $bn_ops : $bn_obj : $des_obj : $bf_obj : $md5_obj : $sha1_obj : $cast_obj : $rc4_obj : $rmd160_obj : $rc5_obj : $dso_scheme
 
 my %table=(
 #"b",		"${tcc}:${tflags}::${tlib}:${bits1}:${tbn_mul}::",
@@ -104,7 +104,7 @@ my %table=(
 "debug-bodo",	"gcc:-DBIO_PAIR_DEBUG -DL_ENDIAN -DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -g -m486 -pedantic -Wshadow -Wall::-D_REENTRANT::BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_elf_asm}",
 "debug-ulf",	"gcc:-DL_ENDIAN -DREF_CHECK -DBN_DEBUG -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -g -O2 -m486 -Wall -Werror -Wshadow -pipe::-D_REENTRANT::${x86_gcc_des} ${x86_gcc_opts}:${x86_elf_asm}",
 "debug-steve",	"gcc:-DL_ENDIAN -DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -DPEDANTIC -g -O2 -m486 -pedantic -Wall -Werror -Wshadow -pipe::-D_REENTRANT::${x86_gcc_des} ${x86_gcc_opts}:${x86_elf_asm}",
-"debug-levitte-linux-elf","gcc:-DUSE_ALLOCATING_PRINT -DRL_DEBUG -DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG -DNO_ASM -DL_ENDIAN -DTERMIO -D_POSIX_SOURCE -ggdb -g3 -m486 -pedantic -ansi -Wall -Wshadow -Wid-clash-31 -pipe::-D_REENTRANT:::",
+"debug-levitte-linux-elf","gcc:-DUSE_ALLOCATING_PRINT -DRL_DEBUG -DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG -DNO_ASM -DL_ENDIAN -DTERMIO -D_POSIX_SOURCE -ggdb -g3 -m486 -pedantic -ansi -Wall -Wshadow -Wid-clash-31 -pipe::-D_REENTRANT:-ldl:::::::::::dlfcn",
 "dist",		"cc:-O::(unknown):::::",
 
 # Basic configs that should work on any (32 and less bit) box
@@ -117,32 +117,32 @@ my %table=(
 # surrounds it with #APP #NO_APP comment pair which (at least Solaris
 # 7_x86) /usr/ccs/bin/as fails to assemble with "Illegal mnemonic"
 # error message.
-"solaris-x86-gcc","gcc:-O3 -fomit-frame-pointer -m486 -Wall -DL_ENDIAN -DNO_INLINE_ASM::-D_REENTRANT:-lsocket -lnsl:BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_sol_asm}",
+"solaris-x86-gcc","gcc:-O3 -fomit-frame-pointer -m486 -Wall -DL_ENDIAN -DNO_INLINE_ASM::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_sol_asm}:dlfcn",
 
 #### SPARC Solaris with GNU C setups
-"solaris-sparcv7-gcc","gcc:-O3 -fomit-frame-pointer -Wall -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:::",
-"solaris-sparcv8-gcc","gcc:-mv8 -O3 -fomit-frame-pointer -Wall -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8.o::",
-"solaris-sparcv9-gcc","gcc:-mcpu=ultrasparc -O3 -fomit-frame-pointer -Wall -DB_ENDIAN -DBN_DIV2W -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8plus.o:::asm/md5-sparcv8plus.o:",
+"solaris-sparcv7-gcc","gcc:-O3 -fomit-frame-pointer -Wall -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR::::::::::dlfcn",
+"solaris-sparcv8-gcc","gcc:-mv8 -O3 -fomit-frame-pointer -Wall -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8.o:::::::::dlfcn",
+"solaris-sparcv9-gcc","gcc:-mcpu=ultrasparc -O3 -fomit-frame-pointer -Wall -DB_ENDIAN -DBN_DIV2W -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8plus.o:::asm/md5-sparcv8plus.o::::::dlfcn",
 # gcc pre-2.8 doesn't understand -mcpu=ultrasparc, so fall down to -mv8
 # but keep the assembler modules.
-"solaris-sparcv9-gcc27","gcc:-mv8 -O3 -fomit-frame-pointer -Wall -DB_ENDIAN -DBN_DIV2W -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8plus-gcc27.o:::asm/md5-sparcv8plus-gcc27.o:",
+"solaris-sparcv9-gcc27","gcc:-mv8 -O3 -fomit-frame-pointer -Wall -DB_ENDIAN -DBN_DIV2W -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8plus-gcc27.o:::asm/md5-sparcv8plus-gcc27.o::::::dlfcn",
 ####
-"debug-solaris-sparcv8-gcc","gcc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -O -g -mv8 -Wall -DB_ENDIAN::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8.o::",
-"debug-solaris-sparcv9-gcc","gcc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -O -g -mcpu=ultrasparc -Wall -DB_ENDIAN::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8plus.o::",
+"debug-solaris-sparcv8-gcc","gcc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -O -g -mv8 -Wall -DB_ENDIAN::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8.o:::::::::dlfcn",
+"debug-solaris-sparcv9-gcc","gcc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -O -g -mcpu=ultrasparc -Wall -DB_ENDIAN::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR:asm/sparcv8plus.o:::::::::dlfcn",
 
 #### SPARC Solaris with Sun C setups
 # DO NOT use /xO[34] on sparc with SC3.0.  It is broken, and will not pass the tests
-"solaris-sparc-sc3","cc:-fast -O -Xa -DB_ENDIAN::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_PTR DES_UNROLL BF_PTR:::",
+"solaris-sparc-sc3","cc:-fast -O -Xa -DB_ENDIAN::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_PTR DES_UNROLL BF_PTR::::::::::dlfcn",
 # SC4.0 doesn't pass 'make test', upgrade to SC5.0 or SC4.2.
 # SC4.2 is ok, better than gcc even on bn as long as you tell it -xarch=v8
 # SC5.0 note: Compiler common patch 107357-01 or later is required!
-"solaris-sparcv7-cc","cc:-xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_PTR DES_RISC1 DES_UNROLL BF_PTR:::",
-"solaris-sparcv8-cc","cc:-xarch=v8 -xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_PTR DES_RISC1 DES_UNROLL BF_PTR:asm/sparcv8.o::",
-"solaris-sparcv9-cc","cc:-xtarget=ultra -xarch=v8plus -xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DBN_DIV2W -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK_LL DES_PTR DES_RISC1 DES_UNROLL BF_PTR:asm/sparcv8plus.o:::asm/md5-sparcv8plus.o:",
-"solaris64-sparcv9-cc","cc:-xtarget=ultra -xarch=v9 -xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl:SIXTY_FOUR_BIT_LONG RC4_CHAR RC4_CHUNK DES_INT DES_PTR DES_RISC1 DES_UNROLL BF_PTR::::asm/md5-sparcv9.o:",
+"solaris-sparcv7-cc","cc:-xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_PTR DES_RISC1 DES_UNROLL BF_PTR::::::::::dlfcn",
+"solaris-sparcv8-cc","cc:-xarch=v8 -xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_PTR DES_RISC1 DES_UNROLL BF_PTR:asm/sparcv8.o:::::::::dlfcn",
+"solaris-sparcv9-cc","cc:-xtarget=ultra -xarch=v8plus -xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DBN_DIV2W -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK_LL DES_PTR DES_RISC1 DES_UNROLL BF_PTR:asm/sparcv8plus.o:::asm/md5-sparcv8plus.o::::::dlfcn",
+"solaris64-sparcv9-cc","cc:-xtarget=ultra -xarch=v9 -xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl -ldl:SIXTY_FOUR_BIT_LONG RC4_CHAR RC4_CHUNK DES_INT DES_PTR DES_RISC1 DES_UNROLL BF_PTR::::asm/md5-sparcv9.o::::::dlfcn",
 ####
-"debug-solaris-sparcv8-cc","cc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -xarch=v8 -g -O -xstrconst -Xa -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK DES_PTR DES_RISC1 DES_UNROLL BF_PTR:asm/sparcv8.o::",
-"debug-solaris-sparcv9-cc","cc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -xtarget=ultra -xarch=v8plus -g -O -xstrconst -Xa -DB_ENDIAN -DBN_DIV2W -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl:BN_LLONG RC4_CHAR RC4_CHUNK_LL DES_PTR DES_RISC1 DES_UNROLL BF_PTR:asm/sparcv8plus.o:::asm/md5-sparcv8plus.o:",
+"debug-solaris-sparcv8-cc","cc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -xarch=v8 -g -O -xstrconst -Xa -DB_ENDIAN -DBN_DIV2W::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_PTR DES_RISC1 DES_UNROLL BF_PTR:asm/sparcv8.o:::::::::dlfcn",
+"debug-solaris-sparcv9-cc","cc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG_ALL -xtarget=ultra -xarch=v8plus -g -O -xstrconst -Xa -DB_ENDIAN -DBN_DIV2W -DULTRASPARC::-D_REENTRANT:-lsocket -lnsl -ldl:BN_LLONG RC4_CHAR RC4_CHUNK_LL DES_PTR DES_RISC1 DES_UNROLL BF_PTR:asm/sparcv8plus.o:::asm/md5-sparcv8plus.o::::::dlfcn",
 
 #### SPARC Linux setups
 "linux-sparcv7","gcc:-DB_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::BN_LLONG RC4_CHAR RC4_CHUNK DES_UNROLL BF_PTR::",
@@ -202,34 +202,34 @@ my %table=(
 #   crypto/sha/sha_lcl.h.
 #					<appro@fy.chalmers.se>
 #
-"hpux-parisc-cc","cc:-Ae +O3 +ESlit -z -DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY::::BN_LLONG DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux-parisc-cc","cc:-Ae +O3 +ESlit -z -DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY:::-ldld:BN_LLONG DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 # Since there is mention of this in shlib/hpux10-cc.sh
-"hpux-parisc-cc-o4","cc:-Ae +O4 +ESlit -z -DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY::::BN_LLONG DES_PTR DES_UNROLL DES_RISC1:::",
-"hpux-parisc-gcc","gcc:-O3 -DB_ENDIAN -DBN_DIV2W::::BN_LLONG DES_PTR DES_UNROLL DES_RISC1:::",
-"hpux64-parisc-cc","cc:-Ae +DD64 +O3 +ESlit -z -DB_ENDIAN -DMD32_XARRAY::-D_REENTRANT::SIXTY_FOUR_BIT_LONG MD2_CHAR RC4_INDEX RC4_CHAR DES_UNROLL DES_RISC1 DES_INT:::",
+"hpux-parisc-cc-o4","cc:-Ae +O4 +ESlit -z -DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY:::-ldld:BN_LLONG DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
+"hpux-parisc-gcc","gcc:-O3 -DB_ENDIAN -DBN_DIV2W:::-ldld:BN_LLONG DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
+"hpux64-parisc-cc","cc:-Ae +DD64 +O3 +ESlit -z -DB_ENDIAN -DMD32_XARRAY::-D_REENTRANT:-ldld:SIXTY_FOUR_BIT_LONG MD2_CHAR RC4_INDEX RC4_CHAR DES_UNROLL DES_RISC1 DES_INT::::::::::dl",
 
 # HPUX 9.X config.
 # Don't use the bundled cc.  It is broken.  Use HP ANSI C if possible, or
 # egcs.  gcc 2.8.1 is also broken.
 
-"hpux-cc",	"cc:-DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY -Ae +ESlit +O3 -z::(unknown)::BN_LLONG DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux-cc",	"cc:-DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY -Ae +ESlit +O3 -z::(unknown):-ldld:BN_LLONG DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 # If hpux-cc fails (e.g. during "make test"), try the next one; otherwise,
 # please report your OS and compiler version to the openssl-bugs@openssl.org
 # mailing list.
-"hpux-brokencc",	"cc:-DB_ENDIAN -DBN_DIV2W -Ae +ESlit +O2 -z::(unknown)::DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux-brokencc",	"cc:-DB_ENDIAN -DBN_DIV2W -Ae +ESlit +O2 -z::(unknown):-ldld:DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 
-"hpux-gcc",	"gcc:-DB_ENDIAN -DBN_DIV2W -O3::(unknown)::BN_LLONG DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux-gcc",	"gcc:-DB_ENDIAN -DBN_DIV2W -O3::(unknown):-ldld:BN_LLONG DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 # If hpux-gcc fails, try this one:
-"hpux-brokengcc",	"gcc:-DB_ENDIAN -DBN_DIV2W -O3::(unknown)::DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux-brokengcc",	"gcc:-DB_ENDIAN -DBN_DIV2W -O3::(unknown):-ldld:DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 
 # HPUX 10.X config.  Supports threads.
-"hpux10-cc",	"cc:-DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY -Ae +ESlit +O3 -z::-D_REENTRANT::BN_LLONG DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux10-cc",	"cc:-DB_ENDIAN -DBN_DIV2W -DMD32_XARRAY -Ae +ESlit +O3 -z::-D_REENTRANT:-ldld:BN_LLONG DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 # If hpux10-cc fails, try this one (if still fails, try deleting BN_LLONG):
-"hpux10-brokencc",	"cc:-DB_ENDIAN -DBN_DIV2W -Ae +ESlit +O2 -z::-D_REENTRANT::BN_LLONG DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux10-brokencc",	"cc:-DB_ENDIAN -DBN_DIV2W -Ae +ESlit +O2 -z::-D_REENTRANT:-ldld:BN_LLONG DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 
-"hpux10-gcc",	"gcc:-DB_ENDIAN -DBN_DIV2W -O3::-D_REENTRANT::BN_LLONG DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux10-gcc",	"gcc:-DB_ENDIAN -DBN_DIV2W -O3::-D_REENTRANT:-ldld:BN_LLONG DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 # If hpux10-gcc fails, try this one:
-"hpux10-brokengcc",	"gcc:-DB_ENDIAN -DBN_DIV2W -O3::-D_REENTRANT::DES_PTR DES_UNROLL DES_RISC1:::",
+"hpux10-brokengcc",	"gcc:-DB_ENDIAN -DBN_DIV2W -O3::-D_REENTRANT:-ldld:DES_PTR DES_UNROLL DES_RISC1::::::::::dl",
 
 # HPUX 11.X from www.globus.org.
 # Only works on PA-RISC 2.0 cpus, and not optimized.  Why?
@@ -268,8 +268,8 @@ my %table=(
 
 # The intel boxes :-), It would be worth seeing if bsdi-gcc can use the
 # bn86-elf.o file file since it is hand tweaked assembler.
-"linux-elf",	"gcc:-DL_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -m486 -Wall::-D_REENTRANT::BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_elf_asm}",
-"debug-linux-elf","gcc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG -DL_ENDIAN -DTERMIO -g -m486 -Wall::-D_REENTRANT:-lefence:BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_elf_asm}",
+"linux-elf",	"gcc:-DL_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -m486 -Wall::-D_REENTRANT:-ldl:BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_elf_asm}:dlfcn",
+"debug-linux-elf","gcc:-DREF_CHECK -DBN_CTX_DEBUG -DCRYPTO_MDEBUG -DL_ENDIAN -DTERMIO -g -m486 -Wall::-D_REENTRANT:-lefence:BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_elf_asm}:dlfcn",
 "linux-aout",	"gcc:-DL_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -m486 -Wall::(unknown)::BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:${x86_out_asm}",
 "linux-mips",   "gcc:-DL_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -Wall::(unknown)::BN_LLONG:::",
 "linux-ppc",    "gcc:-DB_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::BN_LLONG::",
@@ -539,10 +539,19 @@ $openssldir=$prefix . "/" . $openssldir if $openssldir !~ /^\//;
 print "IsWindows=$IsWindows\n";
 
 (my $cc,my $cflags,my $unistd,my $thread_cflag,my $lflags,my $bn_ops,my $bn_obj,my $des_obj,my $bf_obj,
- $md5_obj,$sha1_obj,my $cast_obj,my $rc4_obj,$rmd160_obj,my $rc5_obj)=
+ $md5_obj,$sha1_obj,my $cast_obj,my $rc4_obj,$rmd160_obj,my $rc5_obj,my $dso_scheme)=
 	split(/\s*:\s*/,$table{$target} . ":" x 20 , -1);
 $cflags="$flags$cflags" if ($flags ne "");
 
+# For now the translation from dso_scheme to cflags is trivial. This may well
+# "grow", eg. we could add "dlfcn_no_h" to do what "dlfcn" does and have the
+# latter additionally define HAVE_DLFCN_H (some systems don't have dlfcn.h and
+# it's not needed).
+if ($dso_scheme ne "") {
+	$dso_scheme =~ tr/[a-z]/[A-Z]/;
+	$cflags = "-DDSO_$dso_scheme $cflags";
+}
+
 my $thread_cflags;
 my $thread_defines;
 if ($thread_cflag ne "(unknown)" && !$no_threads)
@@ -952,7 +961,8 @@ sub print_table_entry
 
 	(my $cc,my $cflags,my $unistd,my $thread_cflag,my $lflags,my $bn_ops,
 	my $bn_obj,my $des_obj,my $bf_obj,
-	$md5_obj,$sha1_obj,my $cast_obj,my $rc4_obj,$rmd160_obj,my $rc5_obj)=
+	$md5_obj,$sha1_obj,my $cast_obj,my $rc4_obj,$rmd160_obj,my $rc5_obj,
+	$dso_scheme)=
 	split(/\s*:\s*/,$table{$target} . ":" x 20 , -1);
 			
 	print <<EOF
@@ -973,5 +983,6 @@ sub print_table_entry
 \$rc4_obj      = $rc4_obj
 \$rmd160_obj   = $rmd160_obj
 \$rc5_obj      = $rc5_obj
+\$dso_scheme   = $dso_scheme
 EOF
 	}
diff --git a/Makefile.org b/Makefile.org
index 5b997fd348..5ca1493925 100644
--- a/Makefile.org
+++ b/Makefile.org
@@ -149,7 +149,7 @@ SHLIBDIRS= crypto ssl
 SDIRS=  \
 	md2 md5 sha mdc2 hmac ripemd \
 	des rc2 rc4 rc5 idea bf cast \
-	bn rsa dsa dh \
+	bn rsa dsa dh dso \
 	buffer bio stack lhash rand err objects \
 	evp asn1 pem x509 x509v3 conf txt_db pkcs7 pkcs12 comp
 
diff --git a/crypto/Makefile.ssl b/crypto/Makefile.ssl
index eb022e46aa..b8e3072ee9 100644
--- a/crypto/Makefile.ssl
+++ b/crypto/Makefile.ssl
@@ -27,7 +27,7 @@ LIBS=
 
 SDIRS=	md2 md5 sha mdc2 hmac ripemd \
 	des rc2 rc4 rc5 idea bf cast \
-	bn rsa dsa dh \
+	bn rsa dsa dh dso \
 	buffer bio stack lhash rand err objects \
 	evp asn1 pem x509 x509v3 conf txt_db pkcs7 pkcs12 comp
 
diff --git a/crypto/cryptlib.c b/crypto/cryptlib.c
index a8f29f1e65..40a30a0939 100644
--- a/crypto/cryptlib.c
+++ b/crypto/cryptlib.c
@@ -94,7 +94,8 @@ static const char* lock_names[CRYPTO_NUM_LOCKS] =
 	"RSA_blinding",
 	"dh",
 	"debug_malloc2",
-#if CRYPTO_NUM_LOCKS != 26
+	"dso",
+#if CRYPTO_NUM_LOCKS != 27
 # error "Inconsistency between crypto.h and cryptlib.c"
 #endif
 	};
diff --git a/crypto/crypto-lib.com b/crypto/crypto-lib.com
index 8ddeafbc06..ae347ee1f7 100644
--- a/crypto/crypto-lib.com
+++ b/crypto/crypto-lib.com
@@ -88,7 +88,7 @@ $! Define The Different Encryption Types.
 $!
 $ ENCRYPT_TYPES = "Basic,MD2,MD5,SHA,MDC2,HMAC,RIPEMD,"+ -
 		  "DES,RC2,RC4,RC5,IDEA,BF,CAST,"+ -
-		  "BN,RSA,DSA,DH,"+ -
+		  "BN,RSA,DSA,DH,DSO,"+ -
 		  "BUFFER,BIO,STACK,LHASH,RAND,ERR,OBJECTS,"+ -
 		  "EVP,EVP_2,ASN1,ASN1_2,PEM,X509,X509V3,"+ -
 		  "CONF,TXT_DB,PKCS7,PKCS12,COMP"
@@ -203,6 +203,7 @@ $ LIB_RSA = "rsa_eay,rsa_gen,rsa_lib,rsa_sign,rsa_saos,rsa_err,"+ -
 	"rsa_pk1,rsa_ssl,rsa_none,rsa_oaep,rsa_chk,rsa_null"
 $ LIB_DSA = "dsa_gen,dsa_key,dsa_lib,dsa_asn1,dsa_vrf,dsa_sign,dsa_err,dsa_ossl"
 $ LIB_DH = "dh_gen,dh_key,dh_lib,dh_check,dh_err"
+$ LIB_DSO = "dso_err,dso_lib,dso_null,dso_openssl,dso_vms"
 $ LIB_BUFFER = "buffer,buf_err"
 $ LIB_BIO = "bio_lib,bio_cb,bio_err,"+ -
 	"bss_mem,bss_null,bss_fd,"+ -
diff --git a/crypto/crypto.h b/crypto/crypto.h
index 41c937966e..7ea6a756d4 100644
--- a/crypto/crypto.h
+++ b/crypto/crypto.h
@@ -121,7 +121,8 @@ extern "C" {
 #define	CRYPTO_LOCK_RSA_BLINDING	23
 #define	CRYPTO_LOCK_DH			24
 #define	CRYPTO_LOCK_MALLOC2		25
-#define	CRYPTO_NUM_LOCKS		26
+#define	CRYPTO_LOCK_DSO			26
+#define	CRYPTO_NUM_LOCKS		27
 
 #define CRYPTO_LOCK		1
 #define CRYPTO_UNLOCK		2
diff --git a/crypto/err/Makefile.ssl b/crypto/err/Makefile.ssl
index e1bee09054..010b01d1bb 100644
--- a/crypto/err/Makefile.ssl
+++ b/crypto/err/Makefile.ssl
@@ -89,20 +89,20 @@ err_all.o: ../../include/openssl/blowfish.h ../../include/openssl/bn.h
 err_all.o: ../../include/openssl/buffer.h ../../include/openssl/cast.h
 err_all.o: ../../include/openssl/conf.h ../../include/openssl/crypto.h
 err_all.o: ../../include/openssl/des.h ../../include/openssl/dh.h
-err_all.o: ../../include/openssl/dsa.h ../../include/openssl/e_os2.h
-err_all.o: ../../include/openssl/err.h ../../include/openssl/evp.h
-err_all.o: ../../include/openssl/idea.h ../../include/openssl/lhash.h
-err_all.o: ../../include/openssl/md2.h ../../include/openssl/md5.h
-err_all.o: ../../include/openssl/mdc2.h ../../include/openssl/objects.h
-err_all.o: ../../include/openssl/opensslconf.h ../../include/openssl/opensslv.h
-err_all.o: ../../include/openssl/pem2.h ../../include/openssl/pkcs12.h
-err_all.o: ../../include/openssl/pkcs7.h ../../include/openssl/rand.h
-err_all.o: ../../include/openssl/rc2.h ../../include/openssl/rc4.h
-err_all.o: ../../include/openssl/rc5.h ../../include/openssl/ripemd.h
-err_all.o: ../../include/openssl/rsa.h ../../include/openssl/safestack.h
-err_all.o: ../../include/openssl/sha.h ../../include/openssl/stack.h
-err_all.o: ../../include/openssl/x509.h ../../include/openssl/x509_vfy.h
-err_all.o: ../../include/openssl/x509v3.h
+err_all.o: ../../include/openssl/dsa.h ../../include/openssl/dso.h
+err_all.o: ../../include/openssl/e_os2.h ../../include/openssl/err.h
+err_all.o: ../../include/openssl/evp.h ../../include/openssl/idea.h
+err_all.o: ../../include/openssl/lhash.h ../../include/openssl/md2.h
+err_all.o: ../../include/openssl/md5.h ../../include/openssl/mdc2.h
+err_all.o: ../../include/openssl/objects.h ../../include/openssl/opensslconf.h
+err_all.o: ../../include/openssl/opensslv.h ../../include/openssl/pem2.h
+err_all.o: ../../include/openssl/pkcs12.h ../../include/openssl/pkcs7.h
+err_all.o: ../../include/openssl/rand.h ../../include/openssl/rc2.h
+err_all.o: ../../include/openssl/rc4.h ../../include/openssl/rc5.h
+err_all.o: ../../include/openssl/ripemd.h ../../include/openssl/rsa.h
+err_all.o: ../../include/openssl/safestack.h ../../include/openssl/sha.h
+err_all.o: ../../include/openssl/stack.h ../../include/openssl/x509.h
+err_all.o: ../../include/openssl/x509_vfy.h ../../include/openssl/x509v3.h
 err_prn.o: ../../include/openssl/bio.h ../../include/openssl/buffer.h
 err_prn.o: ../../include/openssl/crypto.h ../../include/openssl/e_os.h
 err_prn.o: ../../include/openssl/e_os2.h ../../include/openssl/err.h
diff --git a/crypto/err/err.c b/crypto/err/err.c
index eb8c76aa0b..cbbd326f74 100644
--- a/crypto/err/err.c
+++ b/crypto/err/err.c
@@ -155,6 +155,7 @@ static ERR_STRING_DATA ERR_str_libraries[]=
 {ERR_PACK(ERR_LIB_X509V3,0,0)		,"X509 V3 routines"},
 {ERR_PACK(ERR_LIB_PKCS12,0,0)		,"PKCS12 routines"},
 {ERR_PACK(ERR_LIB_RAND,0,0)		,"random number generator"},
+{ERR_PACK(ERR_LIB_DSO,0,0)		,"DSO support routines"},
 {0,NULL},
 	};
 
@@ -205,6 +206,7 @@ static ERR_STRING_DATA ERR_str_reasons[]=
 {ERR_R_EXPECTING_AN_ASN1_SEQUENCE	,"expecting an asn1 sequence"},
 {ERR_R_ASN1_LENGTH_MISMATCH		,"asn1 length mismatch"},
 {ERR_R_MISSING_ASN1_EOS			,"missing asn1 eos"},
+{ERR_R_DSO_LIB				,"DSO lib"},
 
 {0,NULL},
 	};
diff --git a/crypto/err/err.h b/crypto/err/err.h
index 15bafbff43..35c4d97b76 100644
--- a/crypto/err/err.h
+++ b/crypto/err/err.h
@@ -123,6 +123,7 @@ typedef struct err_state_st
 #define ERR_LIB_X509V3		34
 #define ERR_LIB_PKCS12		35
 #define ERR_LIB_RAND		36
+#define ERR_LIB_DSO		37
 
 #define ERR_LIB_USER		128
 
@@ -151,6 +152,7 @@ typedef struct err_state_st
 #define X509V3err(f,r) ERR_PUT_error(ERR_LIB_X509V3,(f),(r),ERR_file_name,__LINE__)
 #define PKCS12err(f,r) ERR_PUT_error(ERR_LIB_PKCS12,(f),(r),ERR_file_name,__LINE__)
 #define RANDerr(f,r) ERR_PUT_error(ERR_LIB_RAND,(f),(r),ERR_file_name,__LINE__)
+#define DSOerr(f,r) ERR_PUT_error(ERR_LIB_DSO,(f),(r),ERR_file_name,__LINE__)
 
 /* Borland C seems too stupid to be able to shift and do longs in
  * the pre-processor :-( */
@@ -199,6 +201,7 @@ typedef struct err_state_st
 #define ERR_R_BIO_LIB	ERR_LIB_BIO
 #define ERR_R_PKCS7_LIB	ERR_LIB_PKCS7
 #define ERR_R_PKCS12_LIB ERR_LIB_PKCS12
+#define ERR_R_DSO_LIB	ERR_LIB_DSO
 
 /* fatal error */
 #define	ERR_R_MALLOC_FAILURE			(1|ERR_R_FATAL)
diff --git a/crypto/err/err_all.c b/crypto/err/err_all.c
index 10c463b389..638ed3fe71 100644
--- a/crypto/err/err_all.c
+++ b/crypto/err/err_all.c
@@ -82,6 +82,7 @@
 #include <openssl/pkcs12.h>
 #include <openssl/rand.h>
 #include <openssl/err.h>
+#include <openssl/dso.h>
 
 void ERR_load_crypto_strings(void)
 	{
@@ -118,5 +119,6 @@ void ERR_load_crypto_strings(void)
 	ERR_load_PKCS7_strings();
 	ERR_load_PKCS12_strings();
 	ERR_load_RAND_strings();
+	ERR_load_DSO_strings();
 #endif
 	}
diff --git a/crypto/err/openssl.ec b/crypto/err/openssl.ec
index e132ba3182..02deaa6fc9 100644
--- a/crypto/err/openssl.ec
+++ b/crypto/err/openssl.ec
@@ -3,6 +3,7 @@ L CRYPTO	crypto/crypto.h			crypto/cpt_err.c
 L BN		crypto/bn/bn.h			crypto/bn/bn_err.c
 L RSA		crypto/rsa/rsa.h		crypto/rsa/rsa_err.c
 L DSA		crypto/dsa/dsa.h		crypto/dsa/dsa_err.c
+L DSO		crypto/dso/dso.h		crypto/dso/dso_err.c
 L DH		crypto/dh/dh.h			crypto/dh/dh_err.c
 L EVP		crypto/evp/evp.h		crypto/evp/evp_err.c
 L BUF		crypto/buffer/buffer.h		crypto/buffer/buf_err.c
diff --git a/util/libeay.num b/util/libeay.num
index f611d6b283..54e4fd3aeb 100755
--- a/util/libeay.num
+++ b/util/libeay.num
@@ -2230,3 +2230,20 @@ bn_dump1                                2255
 des_check_key_parity                    2256
 lh_num_items                            2257
 RAND_event                              2258
+DSO_new                                 2259
+DSO_new_method                          2260
+DSO_free                                2261
+DSO_flags                               2262
+DSO_up                                  2263
+DSO_set_default_method                  2264
+DSO_get_default_method                  2265
+DSO_get_method                          2266
+DSO_set_method                          2267
+DSO_load                                2268
+DSO_bind                                2269
+DSO_METHOD_null                         2270
+DSO_METHOD_openssl                      2271
+DSO_METHOD_dlfcn                        2272
+DSO_METHOD_win32                        2273
+ERR_load_DSO_strings                    2274
+DSO_METHOD_dl                           2275
diff --git a/util/mkdef.pl b/util/mkdef.pl
index 4e2845a4e1..57c3124324 100755
--- a/util/mkdef.pl
+++ b/util/mkdef.pl
@@ -102,6 +102,7 @@ $crypto.=" crypto/dsa/dsa.h" unless $no_dsa;
 $crypto.=" crypto/dh/dh.h" unless $no_dh;
 $crypto.=" crypto/hmac/hmac.h" unless $no_hmac;
 
+$crypto.=" crypto/dso/dso.h";
 $crypto.=" crypto/stack/stack.h";
 $crypto.=" crypto/buffer/buffer.h";
 $crypto.=" crypto/bio/bio.h";
diff --git a/util/mkfiles.pl b/util/mkfiles.pl
index 6fa424bd19..924a85f70e 100755
--- a/util/mkfiles.pl
+++ b/util/mkfiles.pl
@@ -25,6 +25,7 @@ my @dirs = (
 "crypto/bn",
 "crypto/rsa",
 "crypto/dsa",
+"crypto/dso",
 "crypto/dh",
 "crypto/buffer",
 "crypto/bio",