Support automatic ABI based on target-os

Signed-off-by: Uilian Ries <uilianries@gmail.com>

Author: uilianries

boost-context-features.jam

@@ -5,6 +5,7 @@
 
 import feature ;
 import os ;
+import property ;
 
 feature.feature segmented-stacks : on : optional propagated composite ;
 feature.compose <segmented-stacks>on : <define>BOOST_USE_SEGMENTED_STACKS ;
@@ -34,20 +35,35 @@ feature.feature binary-format
    ;
 feature.set-default binary-format : [ default_binary_format ] ;
 
-local rule default_abi ( )
+rule default_abi ( properties * )
 {
     local tmp = sysv ;
+    local arch = [ property.select <architecture> : $(properties) ] ;
 
-    # Avoid using "in" operator here: it returns true if its left
-    # part is empty, which happens e.g. with os.platform on
-    # some uncommon architectures.
-    if [ os.name ] = "NT" { tmp = ms ; }
+    if <target-os>windows in $(properties) { tmp = ms ; }
+    else if <target-os>cygwin in $(properties) { tmp = ms ; }
+    else if [ os.name ] = "NT" { tmp = ms ; }
     else if [ os.name ] = "CYGWIN" { tmp = ms ; }
-    else if [ os.platform ] = "ARM" { tmp = aapcs ; }
-    else if [ os.platform ] = "ARM64" { tmp = aapcs ; }
-    else if [ os.platform ] = "MIPS32" { tmp = o32 ; }
-    else if [ os.platform ] = "MIPS64" { tmp = n64 ; }
-    return $(tmp) ;
+    else if $(arch)
+    {
+        if <architecture>arm in $(properties) { tmp = aapcs ; }
+        else if <architecture>mips in $(properties)
+        {
+            if <address-model>64 in $(properties) { tmp = n64 ; }
+            else { tmp = o32 ; }
+        }
+    }
+    else
+    {
+        # Avoid using "in" operator here: it returns true if its left
+        # part is empty, which happens e.g. with os.platform on
+        # some uncommon architectures.
+        if [ os.platform ] = "ARM" { tmp = aapcs ; }
+        else if [ os.platform ] = "ARM64" { tmp = aapcs ; }
+        else if [ os.platform ] = "MIPS32" { tmp = o32 ; }
+        else if [ os.platform ] = "MIPS64" { tmp = n64 ; }
+    }
+    return <abi>$(tmp) ;
 }
 
 feature.feature abi
@@ -62,7 +78,7 @@ feature.feature abi
      x32
    : propagated
    ;
-feature.set-default abi : [ default_abi ] ;
+feature.set-default abi : sysv ;
 
 feature.feature context-impl
     : fcontext

build/Jamfile.v2

@@ -14,10 +14,12 @@ import modules ;
 import os ;
 import toolset ;
 import config : requires ;
+import boost-context-features ;
 
 project
     : common-requirements <library>$(boost_dependencies)
     : requirements
+      <conditional>@boost-context-features.default_abi
       <target-os>windows,<architecture>arm,<address-model>64:<context-impl>winfib
       <target-os>windows:<define>_WIN32_WINNT=0x0601
       <target-os>linux,<toolset>gcc,<segmented-stacks>on:<cxxflags>-fsplit-stack