Do not pass -DNDEBUG to Python compilations in development mode

The Python CFLAGS include -DNDEBUG.  This was apparently done
intentionally -- setting the flags is done manually because, according
to a comment, python-config passes too many things to the compiler
(which is true).

Per PR python/20445, this patch changes configure so that -DNDEBUG is
only used by release builds.  This probably doesn't have very much
effect in practice, but I did see that some Python headers use assert,
so perhaps it will give some safety.

Tested by rebuilding and re-running gdb.python/*.exp on x86-64 Fedora 28.

gdb/ChangeLog
2018-09-17  Tom Tromey  <tom@tromey.com>

	PR python/20445:
	* configure: Rebuild.
	* configure.ac: Conditionally use -DNDEBUG for Python.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 43c4753..e984f53 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,11 @@
 2018-09-17  Tom Tromey  <tom@tromey.com>
 
+       PR python/20445:
+       * configure: Rebuild.
+       * configure.ac: Conditionally use -DNDEBUG for Python.
+
+2018-09-17  Tom Tromey  <tom@tromey.com>
+
        * configure: Rebuild.
        * configure.ac: Use gmp as a library dependency when checking for
        mpfr.

diff --git a/gdb/configure b/gdb/configure
index e011b77..a5d6e74 100755 (executable)
--- a/gdb/configure
+++ b/gdb/configure
@@ -10762,7 +10762,11 @@ $as_echo "#define HAVE_PYTHON 1" >>confdefs.h
   # would make the python-related objects be compiled differently from the
   # rest of GDB (e.g., -O2 and -fPIC).
   if test "${GCC}" = yes; then
-    tentative_python_cflags="-fno-strict-aliasing -DNDEBUG -fwrapv"
+    tentative_python_cflags="-fno-strict-aliasing -fwrapv"
+    # Python headers recommend -DNDEBUG, but it's unclear if that just
+    # refers to building Python itself.  In release mode, though, it
+    # doesn't hurt for the Python code in gdb to follow.
+    $development || tentative_python_cflags="$tentative_python_cflags -DNDEBUG"
   fi
 
   if test "x${tentative_python_cflags}" != x; then

diff --git a/gdb/configure.ac b/gdb/configure.ac
index f658da8..66fc6c6 100644 (file)
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -965,7 +965,11 @@ if test "${have_libpython}" != no; then
   # would make the python-related objects be compiled differently from the
   # rest of GDB (e.g., -O2 and -fPIC).
   if test "${GCC}" = yes; then
-    tentative_python_cflags="-fno-strict-aliasing -DNDEBUG -fwrapv"
+    tentative_python_cflags="-fno-strict-aliasing -fwrapv"
+    # Python headers recommend -DNDEBUG, but it's unclear if that just
+    # refers to building Python itself.  In release mode, though, it
+    # doesn't hurt for the Python code in gdb to follow.
+    $development || tentative_python_cflags="$tentative_python_cflags -DNDEBUG"
   fi
 
   if test "x${tentative_python_cflags}" != x; then