+# Allow the user to override ld, but modify it as necessary below
+case "$ld" in
+ '') case "$cc" in
+ # If the cc is explicitly something else than cc (or empty),
+ # set the ld to be that explicitly something else. Conversely,
+ # if the cc is 'cc' (or empty), set the ld to be 'cc'.
+ cc|'') ld='cc';;
+ *) ld="$cc" ;;
+ esac
+ ;;
+esac
+
+# From http://ftp.netbsd.org/pub/pkgsrc/current/pkgsrc/mk/platform/Darwin.mk
+# and https://trac.macports.org/wiki/XcodeVersionInfo
+# and https://trac.macports.org/wiki/UsingTheRightCompiler
+#
+# 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
+#
+# Note that Apple hijacks the clang preprocessor symbols __clang_major__
+# and __clang_minor__ so they cannot be used (easily) to detect the
+# actual clang release. For example:
+#
+# "Yosemite 10.10.x 14.x.y 6.3 (clang 3.6 as 6.1/602.0.49)"
+#
+# means that the Xcode 6.3 provided the clang 6.3 but called it 6.1
+# (__clang_major__, __clang_minor__) and in addition the preprocessor
+# symbol __apple_build_version__ was 6020049.
+#
+# 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 2.0 (gcc4 4.0.0)
+# 2.2 (gcc4 4.0.1)
+# 2.2.1 (gcc 3.3)
+# 2.5 ?
+# Leopard 10.5.x 9.x.y 3.0 (gcc 4.0.1 default)
+# 3.1 (gcc 4.2.1)
+# Snow Leopard 10.6.x 10.x.y 3.2 (llvm gcc 4.2, clang 2.3 as 1.0)
+# 3.2.1 (clang 1.0.1 as 1.0.1/24)
+# 3.2.2 (clang 1.0.2 as 1.0.2/32)
+# 3.2.3 (clang 1.5 as 1.5/60)
+# 4.0.1 (clang 2.9 as 2.0/138)
+# Lion 10.7.x 11.x.y 4.1 (llvm gcc 4.2.1, clang 3.0 as 2.1/163.7.1)
+# 4.2 (clang 3.0 as 3.0/211.10.1)
+# 4.3.3 (clang 3.1 as 3.1/318.0.61)
+# 4.4 (clang 3.1 as 4.0/421.0.57)
+# Mountain Lion 10.8.x 12.x.y 4.5 (clang 3.1 as 4.1/421.11.65, real gcc removed, there is gcc but it's really clang)
+# 4.6 (clang 3.2 as 4.2/425.0.24)
+# 5.0 (clang 3.3 as 5.0/500.2.75)
+# 5.1 (clang 3.4 as 5.1/503.0.38)
+# 5.1.1 (clang 3.4 as 5.1/503.0.40)
+# Mavericks 10.9.x 13.x.y 6.0.1 (clang 3.5 as 6.0/600.0.51)
+# 6.1 (clang 3.5 as 6.0/600.0.54)
+# 6.1.1 (clang 3.5 as 6.0/600.0.56)
+# 6.2 (clang 3.5 as 6.0/600.0.57)
+# Yosemite 10.10.x 14.x.y 6.3 (clang 3.6 as 6.1/602.0.49)
+# 6.3.1 (clang 3.6 as 6.1/602.0.49)
+# 6.3.2 (clang 3.6 as 6.1/602.0.53)
+# El Capitan 10.11.x 15.x.y 7.0 (clang 3.7 as 7.0/700.0.72)
+# 7.1 (clang 3.7 as 7.0/700.1.76)
+# 7.2 (clang 3.7 as 7.0.2/700.1.81)
+# 7.2.1 (clang 3.7 as 7.0.2/700.1.81)
+# 7.3 (clang 3.7 as 7.3.0/703.0.29)
+#
+
+# Processors Supported
+#
+# PowerPC (PPC): 10.0.x - 10.5.8 (final 10.5.x)
+# PowerPC via Rosetta: 10.4.4 - 10.6.8 (final 10.6.x)
+# IA-32: 10.4.4 - 10.6.8 (though still supported on x86-64)
+# x86-64: 10.4.7 - current
+
+# 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
+}
+