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-rw-r--r--share/mk/src.opts.mk21
1 files changed, 11 insertions, 10 deletions
diff --git a/share/mk/src.opts.mk b/share/mk/src.opts.mk
index a5e78a3d9459..7aca91435da1 100644
--- a/share/mk/src.opts.mk
+++ b/share/mk/src.opts.mk
@@ -210,21 +210,22 @@ __TT=${MACHINE}
.endif
.include <bsd.compiler.mk>
-.if !${COMPILER_FEATURES:Mc++11}
-# If the compiler is not C++11 capable, disable clang and use gcc instead.
-__DEFAULT_YES_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
-__DEFAULT_NO_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
-.elif ${__T} == "aarch64" || ${__T} == "amd64" || ${__TT} == "arm" || \
- ${__T} == "i386"
-# On x86 and arm, clang is enabled, and will be installed as the default cc.
+# If the compiler is not C++11 capable, disable Clang and use GCC instead.
+# This means that architectures that have GCC 4.2 as default can not
+# build Clang without using an external compiler.
+
+.if ${COMPILER_FEATURES:Mc++11} && (${__T} == "aarch64" || \
+ ${__T} == "amd64" || ${__TT} == "arm" || ${__T} == "i386")
+# Clang is enabled, and will be installed as the default /usr/bin/cc.
__DEFAULT_YES_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
__DEFAULT_NO_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
-.elif ${__T:Mpowerpc*}
-# On powerpc, clang is enabled, but gcc is installed as the default cc.
+.elif ${COMPILER_FEATURES:Mc++11} && ${__T:Mpowerpc*}
+# On powerpc, if an external compiler that supports C++11 is used as ${CC},
+# then Clang is enabled, but GCC is installed as the default /usr/bin/cc.
__DEFAULT_YES_OPTIONS+=CLANG CLANG_FULL GCC GCC_BOOTSTRAP GNUCXX
__DEFAULT_NO_OPTIONS+=CLANG_BOOTSTRAP CLANG_IS_CC
.else
-# Everything else disables clang, and uses gcc instead.
+# Everything else disables Clang, and uses GCC instead.
__DEFAULT_YES_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
__DEFAULT_NO_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
.endif