Add --enable-jit=auto support.

git-svn-id: svn:https://vcs.exim.org/pcre/code/trunk@1728 2f5784b3-3f2a-0410-8824-cb99058d5e15
svn2github · Feb 25, 2018 · 4d59072 · 4d59072
1 parent 25ba46b
commit 4d59072
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diff --git a/ChangeLog b/ChangeLog
@@ -51,6 +51,8 @@ crash. This issue was fixed for other kinds of repeat in release 8.37 by change
 
 6. A small fix to pcregrep to avoid compiler warnings for -Wformat-overflow=2.
 
+7. Added --enable-jit=auto support to configure.ac.
+
 
 Version 8.41 05-July-2017
 -------------------------

diff --git a/configure.ac b/configure.ac
@@ -155,6 +155,18 @@ AC_ARG_ENABLE(jit,
  [enable Just-In-Time compiling support]),
  , enable_jit=no)
 
+# This code enables JIT if the hardware supports it.
+
+if test "$enable_jit" = "auto"; then
+ AC_LANG(C)
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+ #define SLJIT_CONFIG_AUTO 1
+ #include "sljit/sljitConfigInternal.h"
+ #if (defined SLJIT_CONFIG_UNSUPPORTED && SLJIT_CONFIG_UNSUPPORTED)
+ #error unsupported
+ #endif]])], enable_jit=yes, enable_jit=no)
+fi
+
 # Handle --disable-pcregrep-jit (enabled by default)
 AC_ARG_ENABLE(pcregrep-jit,
  AS_HELP_STRING([--disable-pcregrep-jit],