From 53259e8aafee04b0e984fc3a4ccaaf2279cadfca Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@linux.intel.com>
Date: Wed, 11 Oct 2017 16:47:59 -0700
Subject: configure.ac: more debugging options

Make -O0 imply -fno-omit-frame-pointer
Add options to compile/link with AddressSanitizer and
UndefinedSanitizer.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
 configure.ac | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 37f51afd..d6b61b49 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,14 +29,19 @@ dnl to either -O3 (normal) or -O0 (for debugging)
 PA_ARG_DISABLED([optimization],
  [compile without optimization (-O0) to help debugging],
  [pa_optimize=-O0], [pa_optimize=-O3])
-AS_IF([test x"$pa_init_cflags" = x],
-      [CFLAGS=`echo "$CFLAGS" | sed -e "s/-O2/$pa_optimize/"`])
 
 dnl Compile and link with dwarf debug
 PA_ARG_ENABLED([gdb],
  [disable optimization and compile with extra debug information for GDB debugger],
- [CFLAGS=`echo "$CFLAGS" | sed -e "s/\(-O2\|-O3\)/-O0/"`
-   PA_ADD_CLDFLAGS([-ggdb3])])
+ [pa_optimize='-O0'
+  PA_ADD_CFLAGS([-ggdb3])
+ ])
+
+AS_IF([test x"$pa_init_cflags" = x],
+      [CFLAGS=`echo "$CFLAGS" | sed -e "s/-O2/$pa_optimize/"`])
+
+AS_IF([test x"$pa_optimize" = "x-O0"],
+      [PA_ADD_CFLAGS([-fno-omit-frame-pointer])])
 
 dnl Check for library extension
 PA_LIBEXT
@@ -179,7 +184,7 @@ PA_FUNC_ATTRIBUTE(pure)
 PA_FUNC_ATTRIBUTE_ERROR
 
 dnl
-dnl support function sections
+dnl support function sections (if available)
 dnl
 PA_ARG_ENABLED([sections],
  [compile with function/data section support],
@@ -187,6 +192,7 @@ PA_ARG_ENABLED([sections],
   PA_ADD_CLDFLAGS([-fdata-sections])
   PA_ADD_CLDFLAGS([-Wl,--gc-sections])],
  [])
+
 dnl
 dnl support LTO
 dnl
@@ -201,6 +207,15 @@ PA_ARG_ENABLED([lto],
   AC_CHECK_PROGS(CC_RANLIB, [${ccbase}-ranlib], [$ac_cv_prog_RANLIB])
   RANLIB="$CC_RANLIB"], [])
 
+dnl
+dnl support sanitizers (if available)
+dnl
+PA_ARG_ENABLED([sanitizer],
+ [compile with sanitizers enabled],
+ [PA_ADD_CFLAGS([-fno-omit-frame-pointer])
+  PA_ADD_CLDFLAGS([-fsanitize=address])
+  PA_ADD_CLDFLAGS([-fsanitize=undefined])])
+
 dnl If we have gcc, add appropriate code cleanliness options
 PA_ADD_CFLAGS([-W])
 PA_ADD_CFLAGS([-Wall])
-- 
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