Support inlining various small performance-critical functions on non-GCC

compilers, by applying a configure check to see if the compiler will accept
an unreferenced "static inline foo ..." function without warnings.  It is
believed that such warnings are the only reason not to declare inlined
functions in headers, if the compiler understands "inline" at all.

Kurt Harriman

1 files changed, 69 insertions, 0 deletions

diff --git a/configure b/configure
index 62999b4ec3..c0ca7bc457 100755
--- a/configure
+++ b/configure
@@ -14535,6 +14535,75 @@ _ACEOF
     ;;
 esac
 
+{ $as_echo "$as_me:$LINENO: checking for quiet inline (no complaint if unreferenced)" >&5
+$as_echo_n "checking for quiet inline (no complaint if unreferenced)... " >&6; }
+if test "${pgac_cv_c_inline_quietly+set}" = set; then
+  $as_echo_n "(cached) " >&6
+else
+  pgac_cv_c_inline_quietly=no
+  if test "$ac_cv_c_inline" != no; then
+    pgac_c_inline_save_werror=$ac_c_werror_flag
+    ac_c_werror_flag=yes
+    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+static inline int fun () {return 0;}
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 $as_test_x conftest$ac_exeext
+       }; then
+  pgac_cv_c_inline_quietly=yes
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+fi
+
+rm -rf conftest.dSYM
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+    ac_c_werror_flag=$pgac_c_inline_save_werror
+  fi
+fi
+{ $as_echo "$as_me:$LINENO: result: $pgac_cv_c_inline_quietly" >&5
+$as_echo "$pgac_cv_c_inline_quietly" >&6; }
+if test "$pgac_cv_c_inline_quietly" != no; then
+
+cat >>confdefs.h <<_ACEOF
+#define USE_INLINE 1
+_ACEOF
+
+fi
+
 { $as_echo "$as_me:$LINENO: checking for preprocessor stringizing operator" >&5
 $as_echo_n "checking for preprocessor stringizing operator... " >&6; }
 if test "${ac_cv_c_stringize+set}" = set; then