Configurations/15-android.conf: add support for "standalone toolchain".

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7400)

1 files changed, 31 insertions, 10 deletions

diff --git a/Configurations/15-android.conf b/Configurations/15-android.conf
index d3b428b6cb..a6b0d7a06d 100644
--- a/Configurations/15-android.conf
+++ b/Configurations/15-android.conf
@@ -24,7 +24,12 @@
 
             my $ndk = $ENV{ANDROID_NDK};
             die "\$ANDROID_NDK is not defined"  if (!$ndk);
-            die "\$ANDROID_NDK=$ndk is invalid" if (!-d "$ndk/platforms");
+            if (!-d "$ndk/platforms" && !-f "$ndk/AndroidVersion.txt") {
+                # $ndk/platforms is traditional "all-inclusive" NDK, while
+                # $ndk/AndroidVersion.txt is so-called standalone toolchain
+                # tailored for specific target down to API level.
+                die "\$ANDROID_NDK=$ndk is invalid";
+            }
             $ndk = canonpath($ndk);
 
             my $ndkver = undef;
@@ -40,10 +45,18 @@
                 close $fh;
             }
 
-            my $sysroot;
+            my ($sysroot, $api, $arch);
+
+            $config{target} =~ m|[^-]+-([^-]+)$|;	# split on dash
+            $arch = $1;
 
-            if (!($sysroot = $ENV{CROSS_SYSROOT})) {
-                my $api = "*";
+            if ($sysroot = $ENV{CROSS_SYSROOT}) {
+                $sysroot =~ m|/android-([0-9]+)/arch-(\w+)/?$|;
+                ($api, $arch) = ($1, $2);
+            } elsif (-f "$ndk/AndroidVersion.txt") {
+                $sysroot = "$ndk/sysroot";
+            } else {
+                $api = "*";
 
                 # see if user passed -D__ANDROID_API__=N
                 foreach (@{$useradd{CPPDEFINES}}, @{$user{CPPFLAGS}}) {
@@ -59,19 +72,15 @@
                                      } glob("$ndk/platforms/android-$api");
                 die "no $ndk/platforms/android-$api" if ($#platforms < 0);
 
-                $config{target} =~ m|[^-]+-([^-]+)$|;   # split on dash
-                $sysroot = "@platforms[$#platforms]/arch-$1";
+                $sysroot = "@platforms[$#platforms]/arch-$arch";
             }
             die "no sysroot=$sysroot"   if (!-d $sysroot);
 
-            $sysroot =~ m|/android-([0-9]+)/arch-(\w+)/?$|;
-            my ($api, $arch) = ($1, $2);
-
             my $triarch = $triplet{$arch};
             my $cflags;
             my $cppflags;
 
-            # see if there is NDK clang on $PATH
+            # see if there is NDK clang on $PATH, "universal" or "standalone"
             if (which("clang") =~ m|^$ndk/.*/prebuilt/([^/]+)/|) {
                 my $host=$1;
                 # harmonize with gcc default
@@ -83,6 +92,18 @@
                         .  "/$tritools-4.9/prebuilt/$host";
                 $user{CC} = "clang" if ($user{CC} !~ m|clang|);
                 $user{CROSS_COMPILE} = undef;
+            } elsif (-f "$ndk/AndroidVersion.txt") {    #"standalone toolchain"
+                my $cc = $user{CC} // "clang";
+                # One can probably argue that both clang and gcc should be
+                # probed, but support for "standalone toolchain" was added
+                # *after* announcement that gcc is being phased out, so
+                # favouring clang is considered adequate. Those who insist
+                # have option to enforce test for gcc with CC=gcc.
+                if (which("$triarch-$cc") !~ m|^$ndk|) {
+                    die "no NDK $triarch-$cc on \$PATH";
+                }
+                $user{CC} = $cc;
+                $user{CROSS_COMPILE} = "$triarch-";
             } elsif ($user{CC} eq "clang") {
                 die "no NDK clang on \$PATH";
             } else {