This patch applies several changes that enable OpenSSL 1.0.2l to be built
for Android using either Clang or GCC toolchains.

An alias for the android-armv7 target, named android-armeabi, is added for
compatability with the OpenSSL 1.1.0 configuration target names. Support for
the AArch64 archicture is also added, as well as targets using the Clang
compiler.

Clang does not recognize some of the ARM assembly nmenonics that are used in
OpenSSL. In particular, the 'adrl' pseudo instruction is not supported. To
further complicate matters, Clang doesn't support immediate fixup values so
the alternative adr/sub sequence used for the Thumb2 code path cannot be
used either. Instead it is replaced with a sequence of instructions that
computes the offset at runtime. It utilizes register r4 for computing the
intermediate result, which is first saved to and later restored from the
stack. The upstream bug in LLVM can be found here:
https://llvm.org/bugs/show_bug.cgi?id=24350

diff -Naur org/Configure mod/Configure
--- org/Configure	2017-05-25 05:54:38.000000000 -0700
+++ mod/Configure	2018-01-17 20:36:12.497485400 -0800
@@ -471,10 +471,17 @@
 "linux-alpha+bwx-ccc","ccc:-fast -readonly_strings -DL_ENDIAN::-D_REENTRANT:::SIXTY_FOUR_BIT_LONG RC4_CHAR RC4_CHUNK DES_INT DES_PTR DES_RISC1 DES_UNROLL:${alpha_asm}",
 
 # Android: linux-* but without pointers to headers and libs.
-"android","gcc:-mandroid -I\$(ANDROID_DEV)/include -B\$(ANDROID_DEV)/lib -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${no_asm}:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
-"android-x86","gcc:-mandroid -I\$(ANDROID_DEV)/include -B\$(ANDROID_DEV)/lib -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:".eval{my $asm=${x86_elf_asm};$asm=~s/:elf/:android/;$asm}.":dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
-"android-armv7","gcc:-march=armv7-a -mandroid -I\$(ANDROID_DEV)/include -B\$(ANDROID_DEV)/lib -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${armv4_asm}:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
-"android-mips","gcc:-mandroid -I\$(ANDROID_DEV)/include -B\$(ANDROID_DEV)/lib -O3 -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${mips32_asm}:o32:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android","gcc:-mandroid --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${no_asm}:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android-x86","gcc:-mandroid --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:".eval{my $asm=${x86_elf_asm};$asm=~s/:elf/:android/;$asm}.":dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android-armv7","gcc:-march=armv7-a -mandroid --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${armv4_asm}:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android-armeabi","gcc:-march=armv7-a -mandroid --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${armv4_asm}:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android64-aarch64","gcc:-march=armv8-a -mandroid --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:SIXTY_FOUR_BIT_LONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${aarch64_asm}:linux64:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android-mips","gcc:-mandroid --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${mips32_asm}:o32:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android-x86-clang","clang:-target i686-none-linux-android --gcc-toolchain=\$(ANDROID_GCC_TOOLCHAIN) --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG ${x86_gcc_des} ${x86_gcc_opts}:".eval{my $asm=${x86_elf_asm};$asm=~s/:elf/:android/;$asm}.":dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android-armv7-clang","clang:-target armv7-none-linux-androideabi --gcc-toolchain=\$(ANDROID_GCC_TOOLCHAIN) --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${armv4_asm}:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android-armeabi-clang","clang:-target armv7-none-linux-androideabi --gcc-toolchain=\$(ANDROID_GCC_TOOLCHAIN) --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${armv4_asm}:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android64-aarch64-clang","clang:-target aarch64-none-linux-android --gcc-toolchain=\$(ANDROID_GCC_TOOLCHAIN) --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -fomit-frame-pointer -Wall::-D_REENTRANT::-ldl:SIXTY_FOUR_BIT_LONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${aarch64_asm}:linux64:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
+"android-mips-clang","clang:-target mipsel-none-linux-android --gcc-toolchain=\$(ANDROID_GCC_TOOLCHAIN) --sysroot \$(ANDROID_LINK_SYSROOT) -isystem \$(ANDROID_SYSROOT)/usr/include -isystem \$(ANDROID_SYSROOT)/usr/include/\$(ANDROID_TRIPLE) -B\$(ANDROID_LINK_SYSROOT)/lib -D__ANDROID_API__=\$(ANDROID_API) -O3 -Wall::-D_REENTRANT::-ldl:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${mips32_asm}:o32:dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
 
 #### *BSD [do see comment about ${BSDthreads} above!]
 "BSD-generic32","gcc:-O3 -fomit-frame-pointer -Wall::${BSDthreads}:::BN_LLONG RC2_CHAR RC4_INDEX DES_INT DES_UNROLL:${no_asm}:dlfcn:bsd-gcc-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",
diff -Naur org/crypto/bn/asm/armv4-gf2m.pl mod/crypto/bn/asm/armv4-gf2m.pl
--- org/crypto/bn/asm/armv4-gf2m.pl	2017-05-25 05:54:34.000000000 -0700
+++ mod/crypto/bn/asm/armv4-gf2m.pl	2018-01-17 20:36:12.508421200 -0800
@@ -213,8 +213,8 @@
 .align	5
 .LNEON:
 	ldr		r12, [sp]		@ 5th argument
-	vmov.32		$a, r2, r1
-	vmov.32		$b, r12, r3
+	vmov		$a, r2, r1
+	vmov		$b, r12, r3
 	vmov.i64	$k48, #0x0000ffffffffffff
 	vmov.i64	$k32, #0x00000000ffffffff
 	vmov.i64	$k16, #0x000000000000ffff
diff -Naur org/crypto/sha/asm/sha256-armv4.pl mod/crypto/sha/asm/sha256-armv4.pl
--- org/crypto/sha/asm/sha256-armv4.pl	2017-05-25 05:54:34.000000000 -0700
+++ mod/crypto/sha/asm/sha256-armv4.pl	2018-01-17 20:36:12.518242800 -0800
@@ -576,6 +576,7 @@
 my @MSG=map("q$_",(8..11));
 my ($W0,$W1,$ABCD_SAVE,$EFGH_SAVE)=map("q$_",(12..15));
 my $Ktbl="r3";
+my $Temp="r4";
 
 $code.=<<___;
 #if __ARM_MAX_ARCH__>=7 && !defined(__KERNEL__)
@@ -591,7 +592,13 @@
 sha256_block_data_order_armv8:
 .LARMv8:
 	vld1.32	{$ABCD,$EFGH},[$ctx]
-# ifdef __thumb2__
+# if defined(__clang__)
+	stmdb	sp!,{r4,lr}
+	adr	$Ktbl,.LARMv8
+	ldr	$Temp,=K256
+	sub	$Temp,$Ktbl,$Temp
+	sub	$Ktbl,$Ktbl,$Temp
+# elif defined(__thumb2__)
 	adr	$Ktbl,.LARMv8
 	sub	$Ktbl,$Ktbl,#.LARMv8-K256
 # else
@@ -655,7 +662,12 @@
 
 	vst1.32		{$ABCD,$EFGH},[$ctx]
 
+# ifdef __clang__
+	ldmia		sp!,{r4,pc}
+# else
 	ret		@ bx lr
+# endif
+
 .size	sha256_block_data_order_armv8,.-sha256_block_data_order_armv8
 #endif
 ___
diff -Naur org/Makefile.org mod/Makefile.org
--- org/Makefile.org	2017-05-25 05:54:38.000000000 -0700
+++ mod/Makefile.org	2018-01-17 20:36:12.532553700 -0800
@@ -540,7 +540,7 @@
 	@$(MAKE) SDIRS='$(SDIRS)' clean
 	@$(MAKE) TAR='$(TAR)' TARFLAGS='$(TARFLAGS)' $(DISTTARVARS) tar
 
-install: all install_docs install_sw
+install: install_docs install_sw
 
 install_sw:
 	@$(PERL) $(TOP)/util/mkdir-p.pl $(INSTALL_PREFIX)$(INSTALLTOP)/bin \
