[svn-r23610] Improvement: DFFV-8245

Use Clang as the compiler for the Mac platform.

Changed all Mac to use clang/clang++ as the default C and CXX compilers if
not provided by the user. Still use gfortran as the default fortran
compiler since Apple does not provide any fortran compiler.

HDFFV-8245: bug fix. Snow Leopard (darwin 10.X) does not have clang++.
Reversed it to use gcc/g++ as the default C and CXX compilers for Darwin 10.X
systems.

Tested: h5committest plus duck (darwin 11), wren (darwin 12) and fred
(darwin 10).

1 files changed, 44 insertions, 4 deletions

diff --git a/config/apple b/config/apple
index c5c0a19..ac93ea5 100644
--- a/config/apple
+++ b/config/apple
@@ -20,17 +20,25 @@
 #
 # See BlankForm in this directory for details.
 
-# The default compiler is `gcc'
+# The default compiler is `clang'.
+# No support for OS older than darwin 10.X.
 if test "X-" = "X-$CC"; then
-    CC=gcc
-    CC_BASENAME=gcc
+    case "$host_os" in
+	darwin10.*)	# Snow Leopard. Use gcc/g++ because clang++ is not available.
+	    CC=gcc
+	    CC_BASENAME=gcc
+	    ;;
+	*)
+	    CC=clang
+	    CC_BASENAME=clang
+	    ;;
+    esac
 fi
 
 # Figure out compiler flags
 . $srcdir/config/gnu-flags
 # temp patch: if GCC 4.2.1 is used in Lion or Mountain Lion systems, do not
 # use -O option as it causes failures in test/dt_arith.
-#echo host_os=$host_os
 case "$host_os" in
     darwin1[12].*)   # lion & mountain lion
 	#echo cc_vendor=$cc_vendor'-'cc_version=$cc_version
@@ -48,6 +56,11 @@ esac
 . $srcdir/config/intel-flags
 if test "X-" = "X-$FC"; then
     case $CC_BASENAME in
+        clang)
+	    # clang has no fortran compiler. Use gfortran.
+            FC=gfortran
+            FC_BASENAME=gfortran
+            ;;
         gcc*)
             FC=gfortran
             FC_BASENAME=gfortran
@@ -59,8 +72,30 @@ if test "X-" = "X-$FC"; then
     esac
 fi
 
+if test "X-" = "X-$CXX"; then
+    case $CC_BASENAME in
+        clang)
+            CXX=clang++
+            CXX_BASENAME=clang++
+            ;;
+        gcc)
+            CXX=g++
+            CXX_BASENAME=g++
+            ;;
+        icc)
+            CXX=icpc
+            CXX_BASENAME=icpc
+            ;;
+    esac
+fi
+
 # compiler version strings
 case $CC in
+    clang)
+        cc_version_info=`$CC $CFLAGS $H5_CFLAGS --version 2>&1 |\
+            grep 'Apple' | sed 's/(.*//'`
+        ;;
+
     *gcc*)
         cc_version_info=`$CC $CFLAGS $H5_CFLAGS --version 2>&1 | grep -v 'PathScale' |\
             grep 'GCC' | sed 's/.*\((GCC) [-a-z0-9\. ]*.*\)/\1/'`
@@ -97,6 +132,11 @@ esac
 
 # get c++ version info
 case $CXX in
+    clang++)
+        cxx_version_info=`$CXX $CXXFLAGS $H5_CXXFLAGS --version 2>&1 |\
+            grep 'Apple' | sed 's/(.*//'`
+        ;;
+
     *g++*)
         cxx_version_info=`$CXX $CXXFLAGS $H5_CXXFLAGS --version 2>&1 |\
             grep 'GCC' | sed 's/.*\((GCC) [-a-z0-9\. ]*.*\)/\1/'`