OS X versioning dance.

Note the difference between the OS X version (10.X) and the kernel version,
it's the latter that Configure knows as $osvers.  Adding a cross-reference
table for these versions rom the NetBSD project.

For OS X 10.6 or above, do not any more use the MACOSX_DEPLOYMENT_TARGET,
the toolchains should work fine without.  Until now the deployment target
was hardwired to 10.3.  This logic comes from
https://rt.perl.org/Public/Bug/Display.html?id=117433

For OS X releases from 10.3 until 10.5, no change, still using
the MACOSX_DEPLOYMENT_TARGET=10.3 for linking.

For OS X releases before 10.3, no change, still not using
the MACOSX_DEPLOYMENT_TARGET=10.3.

New: always add -mmacosx-version-min to ccflags and ldflags from
the env var $MACOSX_DEPLOYMENT_TARGET, if set.  If the var is not set,
set the min from the OS X version, from sw_vers(1).  Setting the var
should become handy for people building and packaging Perl for earlier
OS X versions.

We assume that the toolchain/SDK installed to system will be able to build
for the requested minimum versions and deployment targets, or if it is not,
it should properly warn or die.

Some related tickets, past and present:

https://rt.perl.org/Public/Bug/Display.html?id=126360
https://rt.perl.org/Public/Bug/Display.html?id=123985
https://rt.perl.org/Public/Bug/Display.html?id=123831
https://rt.perl.org/Public/Bug/Display.html?id=117433

1 files changed, 102 insertions, 7 deletions

diff --git a/hints/darwin.sh b/hints/darwin.sh
index 81cdcff615..956e80fdaa 100644
--- a/hints/darwin.sh
+++ b/hints/darwin.sh
@@ -186,30 +186,125 @@ case "$ld" in
         ;;
 esac
 
+# From http://ftp.netbsd.org/pub/pkgsrc/current/pkgsrc/mk/platform/Darwin.mk
+#
+# OS, Kernel, Xcode Version
+# Note that Xcode gets updates on older systems sometimes.
+# pkgsrc generally expects that the most up-to-date xcode available for
+# an OS version is installed
+#
+# Codename        OS      Kernel  Xcode
+# Cheetah         10.0.x  1.3.1
+# Puma            10.1    1.4.1
+#                 10.1.x  5.x.y
+# Jaguar          10.2.x  6.x.y
+# Panther         10.3.x  7.x.y
+# Tiger           10.4.x  8.x.y   2.x (gcc 4.0, 4.0.1 from 2.2)
+# Leopard         10.5.x  9.x.y   3.x (gcc 4.0.1, 4.0.1 and 4.2.1 from 3.1)
+# Snow Leopard    10.6.x  10.x.y  3.2+ (gcc 4.0.1 and 4.2.1)
+# Lion            10.7.x  11.x.y  4.1 (llvm gcc 4.2.1)
+# Mountain Lion   10.8.x  12.x.y  4.5 (llvm gcc 4.2.1)
+# Mavericks       10.9.x  13.x.y  6 (llvm clang 6.0)
+# Yosemite        10.10.x 14.x.y  6 (llvm clang 6.0)
+# El Capitan      10.11.x 15.x.y  7 (llvm clang 7.0)
+
+# MACOSX_DEPLOYMENT_TARGET selects the minimum OS level we want to support
+#
+# It is needed for OS releases before 10.6.
+#
+# https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/cross_development/Configuring/configuring.html
+#
+# If it is set, we also propagate its value to ccflags and ldflags
+# using the -mmacosx-version-min flag.  If it is not set, we use
+# the OS X release as the min value for the flag.
+
+# Adds "-mmacosx-version-min=$2" to "$1" unless it already is there.
+add_macosx_version_min () {
+  local v
+  eval "v=\$$1"
+  case " $v " in
+  *"-mmacosx-version-min"*)
+     echo "NOT adding -mmacosx-version-min=$2 to $1 ($v)" >&4
+     ;;
+  *) echo "Adding -mmacosx-version-min=$2 to $1" >&4
+     eval "$1='$v -mmacosx-version-min=$2'"
+     ;;
+  esac
+}
+
 # Perl bundles do not expect two-level namespace, added in Darwin 1.4.
 # But starting from perl 5.8.1/Darwin 7 the default is the two-level.
-case "$osvers" in
-1.[0-3].*)
+case "$osvers" in  # Note: osvers is the kernel version, not the 10.x
+1.[0-3].*) # OS X 10.0.x
    lddlflags="${ldflags} -bundle -undefined suppress"
    ;;
-1.*)
+1.*)       # OS X 10.1
    ldflags="${ldflags} -flat_namespace"
    lddlflags="${ldflags} -bundle -undefined suppress"
    ;;
-[2-6].*)
+[2-6].*)   # OS X 10.1.x - 10.2.x (though [2-4] never existed publicly)
    ldflags="${ldflags} -flat_namespace"
    lddlflags="${ldflags} -bundle -undefined suppress"
    ;;
-*) 
-   # MACOSX_DEPLOYMENT_TARGET selects the minimum OS level we want to support
-   # https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/cross_development/Configuring/configuring.html
+[7-9].*)   # OS X 10.3.x - 10.5.x
    lddlflags="${ldflags} -bundle -undefined dynamic_lookup"
    case "$ld" in
        *MACOSX_DEVELOPMENT_TARGET*) ;;
        *) ld="env MACOSX_DEPLOYMENT_TARGET=10.3 ${ld}" ;;
    esac
    ;;
+*)        # OS X 10.6.x - current
+   # The MACOSX_DEPLOYMENT_TARGET is not needed,
+   # but the -mmacosx-version-min option is always used.
+
+   # We now use MACOSX_DEPLOYMENT_TARGET, if set, as an override by
+   # capturing its value and adding it to the flags.
+    case "$MACOSX_DEPLOYMENT_TARGET" in
+    10.*)
+      add_macosx_version_min ccflags $MACOSX_DEPLOYMENT_TARGET
+      add_macosx_version_min ldflags $MACOSX_DEPLOYMENT_TARGET
+      ;;
+    '')
+      # Empty MACOSX_DEPLOYMENT_TARGET is okay.
+      ;;
+    *)
+      cat <<EOM >&4
+
+*** Unexpected MACOSX_DEPLOYMENT_TARGET=$MACOSX_DEPLOYMENT_TARGET
+***
+*** Please either set it to 10.something, or to empty.
+
+EOM
+      exit 1
+      ;;
+    esac
+
+    # Keep the prodvers leading whitespace (Configure magic).
+    # Cannot use $osvers here since that is the kernel version.
+    # sw_vers output                 what we want
+    # "ProductVersion:    10.10.5"   "10.10"
+    # "ProductVersion:    10.11"     "10.11"
+        prodvers=`sw_vers|awk '/^ProductVersion:/{print $2}'|awk -F. '{print $1"."$2}'`
+    case "$prodvers" in
+    10.*)
+      add_macosx_version_min ccflags $prodvers
+      add_macosx_version_min ldflags $prodvers
+      ;;
+    *)
+      cat <<EOM >&4
+
+*** Unexpected product version $prodvers.
+***
+*** Try running sw_vers and see what its ProductVersion says.
+
+EOM
+      exit 1
+    esac
+
+   lddlflags="${ldflags} -bundle -undefined dynamic_lookup"
+   ;;
 esac
+
 ldlibpthname='DYLD_LIBRARY_PATH';
 
 # useshrplib=true results in much slower startup times.