From 2f130f199a5510f6aa7ac6199e34885242411039 Mon Sep 17 00:00:00 2001
From: Akim Demaille <akim@lrde.epita.fr>
Date: Mon, 26 Nov 2012 10:42:49 +0100
Subject: [PATCH] tests: use -fno-strict-aliasing with variants
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Reported by Théophile Ranquet.

* configure.ac (NO_STRICT_ALIAS_CXXFLAGS): New.
* tests/c++.at, tests/atlocal.in, examples/local.mk: Use it.
---
 configure.ac      | 2 ++
 examples/local.mk | 4 ++++
 tests/atlocal.in  | 3 +++
 tests/c++.at      | 2 +-
 4 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index aec681ad..a4eb373e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -111,6 +111,8 @@ if test "$enable_gcc_warnings" = yes; then
   # Warnings for the test suite only.
   gl_WARN_ADD([-Wundef], [WARN_CXXFLAGS_TEST])
   gl_WARN_ADD([-pedantic], [WARN_CXXFLAGS_TEST])
+  # Variants break strict aliasing analysis.
+  gl_WARN_ADD([-fno-strict-aliasing], [NO_STRICT_ALIAS_CXXFLAGS])
   CXXFLAGS=$save_CXXFLAGS
   AC_LANG_POP([C++])
 fi
diff --git a/examples/local.mk b/examples/local.mk
index 94a31674..3a6fcf0d 100644
--- a/examples/local.mk
+++ b/examples/local.mk
@@ -16,6 +16,10 @@
 dist_noinst_SCRIPTS = examples/extexi examples/test
 TEST_LOG_COMPILER = $(top_srcdir)/examples/test
 
+AM_CXXFLAGS =							\
+  $(NO_STRICT_ALIAS_CXXFLAGS)					\
+  $(WARN_CXXFLAGS) $(WARN_CXXFLAGS_TEST) $(WERROR_CXXFLAGS)
+
 ## ------------ ##
 ## Extracting.  ##
 ## ------------ ##
diff --git a/tests/atlocal.in b/tests/atlocal.in
index 649e0743..a545e5e2 100644
--- a/tests/atlocal.in
+++ b/tests/atlocal.in
@@ -38,6 +38,9 @@ NO_WERROR_CXXFLAGS='@CXXFLAGS@ @WARN_CXXFLAGS@ @WARN_CXXFLAGS_TEST@'
   CFLAGS="$NO_WERROR_CFLAGS   @WERROR_CFLAGS@"
 CXXFLAGS="$NO_WERROR_CXXFLAGS @WERROR_CXXFLAGS@"
 
+# C++ variants break strict aliasing analysis.
+NO_STRICT_ALIAS_CXXFLAGS='@NO_STRICT_ALIAS_CXXFLAGS@'
+
 # If 'exit 77'; skip all C++ tests; otherwise ':'.
 BISON_CXX_WORKS='@BISON_CXX_WORKS@'
 
diff --git a/tests/c++.at b/tests/c++.at
index f5e5f463..08040d6e 100644
--- a/tests/c++.at
+++ b/tests/c++.at
@@ -176,7 +176,7 @@ main ()
 ]])
 
 AT_BISON_CHECK([-o list.cc list.yy])
-AT_COMPILE_CXX([list])
+AT_COMPILE_CXX([list], [$NO_STRICT_ALIAS_CXXFLAGS list.cc])
 AT_PARSER_CHECK([./list], 0,
 [(0, 1, 2, 4)
 ])
-- 
2.47.2