[PATCH] Revert "configure: Add workaround for ccache and clang"

[Yonggang Luo <luoyonggang@gmail.com>]

This reverts commit fd0e60530f10078f488fa3e9591cc7db5732989c.

According to https://peter.eisentraut.org/blog/2014/12/01/ccache-and-clang-part-3
it's already fixed in new version of ccache

According to https://ccache.dev/manual/4.8.html#config_run_second_cpp
CCACHE_CPP2 are default to true for new version ccache

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
---
 configure | 32 --------------------------------
 1 file changed, 32 deletions(-)

diff --git a/configure b/configure
index e08127045d..3f8dd94b50 100755
--- a/configure
+++ b/configure
@@ -1161,34 +1161,6 @@ EOF
   fi
 fi
 
-########################################
-# check if ccache is interfering with
-# semantic analysis of macros
-
-unset CCACHE_CPP2
-ccache_cpp2=no
-cat > $TMPC << EOF
-static const int Z = 1;
-#define fn() ({ Z; })
-#define TAUT(X) ((X) == Z)
-#define PAREN(X, Y) (X == Y)
-#define ID(X) (X)
-int main(void)
-{
-    int x = 0, y = 0;
-    x = ID(x);
-    x = fn();
-    fn();
-    if (PAREN(x, y)) return 0;
-    if (TAUT(Z)) return 0;
-    return 0;
-}
-EOF
-
-if ! compile_object "-Werror"; then
-    ccache_cpp2=yes
-fi
-
 ##########################################
 # functions to probe cross compilers
 
@@ -1722,10 +1694,6 @@ if test "$default_targets" = "yes"; then
   echo "CONFIG_DEFAULT_TARGETS=y" >> $config_host_mak
 fi
 
-if test "$ccache_cpp2" = "yes"; then
-  echo "export CCACHE_CPP2=y" >> $config_host_mak
-fi
-
 # contrib/plugins configuration
 echo "# Automatically generated by configure - do not modify" > contrib/plugins/$config_host_mak
 echo "SRC_PATH=$source_path/contrib/plugins" >> contrib/plugins/$config_host_mak
-- 
2.39.0.windows.1