Check if clang and clang++ are used to test glibc

Set have-test-clang to yes if clang is used to test glibc.  Set
have-test-clangxx to yes if clang++ is used to test glibc.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/configure b/configure
index 2c2b19f..e9c1831 100755
--- a/configure
+++ b/configure
@@ -5993,6 +5993,82 @@ fi
 printf "%s\n" "$libc_cv_with_fp" >&6; }
 
 
+conftest_code="
+#ifndef __clang__
+#error Not Clang!
+#endif
+"
+
+
+cat > conftest.c <<EOF
+$conftest_code
+EOF
+
+saved_CC="$CC"
+CC="$TEST_CC"
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for clang in testing" >&5
+printf %s "checking for clang in testing... " >&6; }
+if test ${libc_cv_test_clang+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e)     if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c -o conftest 1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+      libc_cv_test_clang=yes
+    else
+      libc_cv_test_clang=no
+    fi ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_clang" >&5
+printf "%s\n" "$libc_cv_test_clang" >&6; }
+
+CC="$saved_CC"
+
+rm -f conftest*
+config_vars="$config_vars
+have-test-clang = $libc_cv_test_clang"
+
+
+cat > conftest.cc <<EOF
+$conftest_code
+EOF
+
+saved_CXX="$CXX"
+CXX="$TEST_CXX"
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for clang++ in testing" >&5
+printf %s "checking for clang++ in testing... " >&6; }
+if test ${libc_cv_test_clangxx+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e)     if { ac_try='${CXX-c++} $CXXFLAGS $CPPFLAGS -c conftest.cc -o conftest 1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+      libc_cv_test_clangxx=yes
+    else
+      libc_cv_test_clangxx=no
+    fi ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_test_clangxx" >&5
+printf "%s\n" "$libc_cv_test_clangxx" >&6; }
+
+CXX="$saved_CXX"
+
+rm -f conftest*
+config_vars="$config_vars
+have-test-clangxx = $libc_cv_test_clangxx"
+
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -fstack-protector" >&5
 printf %s "checking for -fstack-protector... " >&6; }
 if test ${libc_cv_ssp+y}