From 4a390372f0b21fd0b1753f63bf27fd1e37257f46 Mon Sep 17 00:00:00 2001
From: heister <heister@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Fri, 7 Oct 2011 21:11:11 +0000
Subject: [PATCH] support clang as CC compiler

git-svn-id: https://svn.dealii.org/trunk@24558 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/aclocal.m4 | 53 +++++++++++++++++++++++++++++-----------------
 deal.II/configure  | 32 ++++++++++++++++++++--------
 2 files changed, 56 insertions(+), 29 deletions(-)

diff --git a/deal.II/aclocal.m4 b/deal.II/aclocal.m4
index 7fd9c6d0c1..998e746664 100644
--- a/deal.II/aclocal.m4
+++ b/deal.II/aclocal.m4
@@ -1382,26 +1382,33 @@ AC_DEFUN(DEAL_II_DETERMINE_CC_BRAND, dnl
   	              CC_VERSION=borland_bcc
   	            else
 
-  	              dnl KAI C? It seems as if the documented options
-		      dnl -V and --version are not always supported, so give
-	              dnl the whole thing a second try by looking for /KCC/
-	 	      dnl somewhere in the paths that are output by -v. This
-	              dnl is risky business, since this combination of
-	              dnl characters might appear on other installations
-                      dnl of other compilers as well, so put this test to
-                      dnl the very end of the detection chain for the
-                      dnl various compilers
-  	              is_kai_cc="`($CC --version 2>&1) | grep 'KAI C'`"
-  	              is_kai_cc="$is_kai_cc`($CC -v 2>&1) | grep /KCC/`"
-  	              if test "x$is_kai_cc" != "x" ; then
-  	                AC_MSG_RESULT(C compiler is KAI C)
-  	                CC_VERSION=kai_cc
-  	              else
-
-                        dnl  Aw, nothing suitable found...
-                        AC_MSG_RESULT([Unrecognized compiler -- still trying])
-			CC_VERSION=unknown_cc
-                      fi
+		      is_clang="`($CC --version 2>&1) | grep clang`"
+		      if test "x$is_clang" != x ; then
+                        AC_MSG_RESULT(C compiler is clang)
+			CC_VERSION=clang
+		      else
+
+  	                dnl KAI C? It seems as if the documented options
+		        dnl -V and --version are not always supported, so give
+	                dnl the whole thing a second try by looking for /KCC/
+	 	        dnl somewhere in the paths that are output by -v. This
+	                dnl is risky business, since this combination of
+	                dnl characters might appear on other installations
+                        dnl of other compilers as well, so put this test to
+                        dnl the very end of the detection chain for the
+                        dnl various compilers
+  	                is_kai_cc="`($CC --version 2>&1) | grep 'KAI C'`"
+  	                is_kai_cc="$is_kai_cc`($CC -v 2>&1) | grep /KCC/`"
+  	                if test "x$is_kai_cc" != "x" ; then
+  	                  AC_MSG_RESULT(C compiler is KAI C)
+  	                  CC_VERSION=kai_cc
+  	                else
+
+                          dnl  Aw, nothing suitable found...
+                          AC_MSG_RESULT([Unrecognized compiler -- still trying])
+			  CC_VERSION=unknown_cc
+                        fi
+		      fi
                     fi
                   fi
                 fi
@@ -1540,6 +1547,12 @@ AC_DEFUN(DEAL_II_SET_CC_FLAGS, dnl
 
           ;;
 
+      clang)
+	  CFLAGS="$CFLAGS -g"
+	  CFLAGSO="$CFLAGS -fast -O2"
+	  CFLAGSPIC="-fPIC"
+	  ;;
+
       sun_cc*)
           CFLAGS="$CFLAGS -g"
           CFLAGSO="$CFLAGS -fast -O2"
diff --git a/deal.II/configure b/deal.II/configure
index 8c792b8eba..9b603ebcdd 100755
--- a/deal.II/configure
+++ b/deal.II/configure
@@ -5175,18 +5175,26 @@ $as_echo "C compiler is Borland C" >&6; }
   	              CC_VERSION=borland_bcc
   	            else
 
-  	              		      	              	 	      	              	                                                                                  	              is_kai_cc="`($CC --version 2>&1) | grep 'KAI C'`"
-  	              is_kai_cc="$is_kai_cc`($CC -v 2>&1) | grep /KCC/`"
-  	              if test "x$is_kai_cc" != "x" ; then
-  	                { $as_echo "$as_me:${as_lineno-$LINENO}: result: C compiler is KAI C" >&5
+		      is_clang="`($CC --version 2>&1) | grep clang`"
+		      if test "x$is_clang" != x ; then
+                        { $as_echo "$as_me:${as_lineno-$LINENO}: result: C compiler is clang" >&5
+$as_echo "C compiler is clang" >&6; }
+			CC_VERSION=clang
+		      else
+
+  	                		        	                	 	        	                	                                                                                          	                is_kai_cc="`($CC --version 2>&1) | grep 'KAI C'`"
+  	                is_kai_cc="$is_kai_cc`($CC -v 2>&1) | grep /KCC/`"
+  	                if test "x$is_kai_cc" != "x" ; then
+  	                  { $as_echo "$as_me:${as_lineno-$LINENO}: result: C compiler is KAI C" >&5
 $as_echo "C compiler is KAI C" >&6; }
-  	                CC_VERSION=kai_cc
-  	              else
+  	                  CC_VERSION=kai_cc
+  	                else
 
-                                                { $as_echo "$as_me:${as_lineno-$LINENO}: result: Unrecognized compiler -- still trying" >&5
+                                                    { $as_echo "$as_me:${as_lineno-$LINENO}: result: Unrecognized compiler -- still trying" >&5
 $as_echo "Unrecognized compiler -- still trying" >&6; }
-			CC_VERSION=unknown_cc
-                      fi
+			  CC_VERSION=unknown_cc
+                        fi
+		      fi
                     fi
                   fi
                 fi
@@ -5322,6 +5330,12 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
           ;;
 
+      clang)
+	  CFLAGS="$CFLAGS -g"
+	  CFLAGSO="$CFLAGS -fast -O2"
+	  CFLAGSPIC="-fPIC"
+	  ;;
+
       sun_cc*)
           CFLAGS="$CFLAGS -g"
           CFLAGSO="$CFLAGS -fast -O2"
-- 
2.39.5