Enable precompiled headers when using clangtest

1 files changed, 77 insertions, 0 deletions

diff --git a/configure b/configure
index 79661e7..1b033da 100755
--- a/configure
+++ b/configure
@@ -627,6 +627,7 @@ LIBOBJS
 subprojects_enabled
 subprojects
 HAVE_DLOPEN
+HAVE_CLANG_PCH
 HAVE_INT128
 INSTALL_DATA
 INSTALL_SCRIPT
@@ -2334,6 +2335,45 @@ case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac
 
 
 # ===========================================================================
+#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+#   Check whether the given FLAG works with the current language's compiler
+#   or gives an error.  (Warnings, however, are ignored)
+#
+#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+#   success/failure.
+#
+#   If EXTRA-FLAGS is defined, it is added to the current language's default
+#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
+#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
+#   force the compiler to issue an error when a bad flag is given.
+#
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
+#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
+#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.  This file is offered as-is, without any
+#   warranty.
+
+#serial 6
+
+
+# ===========================================================================
 #    https://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
 # ===========================================================================
 #
@@ -4647,6 +4687,43 @@ fi
 done
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C++ compiler accepts -relocatable-pch" >&5
+$as_echo_n "checking whether C++ compiler accepts -relocatable-pch... " >&6; }
+if ${ax_cv_check_cxxflags___relocatable_pch+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+  ax_check_save_flags=$CXXFLAGS
+  CXXFLAGS="$CXXFLAGS  -relocatable-pch"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  ax_cv_check_cxxflags___relocatable_pch=yes
+else
+  ax_cv_check_cxxflags___relocatable_pch=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+  CXXFLAGS=$ax_check_save_flags
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cxxflags___relocatable_pch" >&5
+$as_echo "$ax_cv_check_cxxflags___relocatable_pch" >&6; }
+if test "x$ax_cv_check_cxxflags___relocatable_pch" = xyes; then :
+  HAVE_CLANG_PCH=yes
+
+else
+  :
+fi
+
+
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