add has_broken_mac_gcc_llvm and use clang if true

plugins/python-build/bin/python-build

@@ -626,19 +626,27 @@ require_gcc() {
 }
 
 require_cc() {
-  local cc ccname
+  while [ -n "$1" ]; do
-  for ccname in "$@"; do
+    if [ "$1" = "--if" ]; then
-    cc="$(locate_cc "$ccname" || true)"
+      "$2" || return 0
-    if [ -n "$cc" ]; then
+      shift 2
+    else
       break
     fi
   done
 
+  local cc
+  local ccname="${1:-cc}"
+  cc="$(locate_cc "$ccname" || true)"
+  if [ -n "$cc" ]; then
+    break
+  fi
+
   if [ -z "$cc" ]; then
     local esc=$'\033'
     { echo
-      echo "${esc}[1mERROR${esc}[0m: This package must be compiled with $@, but python-build couldn't"
+      echo "${esc}[1mERROR${esc}[0m: This package must be compiled with $ccname, but python-build couldn't"
-      echo "find a suitable \`cc\` executable on your system. Please install $@"
+      echo "find a suitable \`cc\` executable on your system. Please install $ccname"
       echo "and try again."
       echo
     } >&3
@@ -671,7 +679,7 @@ locate_cc() {
 }
 
 gccs_in_path() {
-  ccs_in_path "$gcc" "$@"
+  ccs_in_path "gcc" "$@"
 }
 
 ccs_in_path() {
@@ -764,6 +772,11 @@ has_broken_mac_readline() {
   return "$retval"
 }
 
+has_broken_mac_gcc_llvm() {
+  [ "$(uname -s)" = "Darwin" ] &&
+  [ "$(gcc --version 2>/dev/null || true)" = "llvm-gcc-4.2" ]
+}
+
 # Post-install check for Python 2.5.x
 build_package_verify_py25() {
   build_package_verify_readline "$@"

plugins/python-build/share/python-build/3.3-dev

@@ -1,4 +1,4 @@
-require_gcc
+require_cc --if has_broken_mac_gcc_llvm "clang"
 install_package "readline-6.2" "http://ftpmirror.gnu.org/readline/readline-6.2.tar.gz#67948acb2ca081f23359d0256e9a271c" standard --if has_broken_mac_readline
 install_hg "Python-3.3-dev" "https://bitbucket.org/mirror/cpython" "3.3" standard verify_py33
 install_package "setuptools-0.7.4" "https://bitbucket.org/pypa/setuptools/downloads/setuptools-0.7.4.tar.gz#c0b8864b63c13312f5d9568c2a54247e" python

plugins/python-build/share/python-build/3.3.0

@@ -1,4 +1,4 @@
-require_gcc
+require_cc --if has_broken_mac_gcc_llvm "clang"
 install_package "readline-6.2" "http://ftpmirror.gnu.org/readline/readline-6.2.tar.gz#67948acb2ca081f23359d0256e9a271c" standard --if has_broken_mac_readline
 install_package "Python-3.3.0" "http://python.org/ftp/python/3.3.0/Python-3.3.0.tgz#198a64f7a04d1d5e95ce2782d5fd8254" standard verify_py33
 install_package "setuptools-0.7.4" "https://bitbucket.org/pypa/setuptools/downloads/setuptools-0.7.4.tar.gz#c0b8864b63c13312f5d9568c2a54247e" python

plugins/python-build/share/python-build/3.3.1

@@ -1,4 +1,4 @@
-require_gcc
+require_cc --if has_broken_mac_gcc_llvm "clang"
 install_package "readline-6.2" "http://ftpmirror.gnu.org/readline/readline-6.2.tar.gz#67948acb2ca081f23359d0256e9a271c" standard --if has_broken_mac_readline
 install_package "Python-3.3.1" "http://python.org/ftp/python/3.3.1/Python-3.3.1.tgz#c19bfd6ea252b61779a4f2996fb3b330" standard verify_py33
 install_package "setuptools-0.7.4" "https://bitbucket.org/pypa/setuptools/downloads/setuptools-0.7.4.tar.gz#c0b8864b63c13312f5d9568c2a54247e" python

plugins/python-build/share/python-build/3.3.2

@@ -1,4 +1,4 @@
-require_gcc
+require_cc --if has_broken_mac_gcc_llvm "clang"
 install_package "readline-6.2" "http://ftpmirror.gnu.org/readline/readline-6.2.tar.gz#67948acb2ca081f23359d0256e9a271c" standard --if has_broken_mac_readline
 install_package "Python-3.3.2" "http://python.org/ftp/python/3.3.2/Python-3.3.2.tgz#0a2ea57f6184baf45b150aee53c0c8da" standard verify_py33
 install_package "setuptools-0.7.4" "https://bitbucket.org/pypa/setuptools/downloads/setuptools-0.7.4.tar.gz#c0b8864b63c13312f5d9568c2a54247e" python

plugins/python-build/share/python-build/3.4-dev

@@ -5,7 +5,7 @@ if ! pyenv-which python3.4 1>/dev/null 2>&1; then
   fi
 fi
 
-require_gcc
+require_cc --if has_broken_mac_gcc_llvm "clang"
 install_package "readline-6.2" "http://ftpmirror.gnu.org/readline/readline-6.2.tar.gz#67948acb2ca081f23359d0256e9a271c" standard --if has_broken_mac_readline
 install_hg "Python-3.4-dev" "https://bitbucket.org/mirror/cpython" "default" standard verify_py34
 install_package "setuptools-0.7.4" "https://bitbucket.org/pypa/setuptools/downloads/setuptools-0.7.4.tar.gz#c0b8864b63c13312f5d9568c2a54247e" python