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Only use -Wlogical-op with GCC 4.6 and later

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It generates an apparently spurious warning with gcc 4.4 in debian;
we haven't tested 4.5.
This commit is contained in:
Nick Mathewson 2013-10-31 11:57:50 -04:00
parent d3420e7e73
commit 4c6081910d
1 changed files with 15 additions and 1 deletions
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16
configure.ac
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@ -1446,6 +1446,12 @@ if test x$enable_gcc_warnings = xyes || test x$enable_gcc_warnings_advisory = xy
#error
#endif])], have_gcc43=yes, have_gcc43=no)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
#error
#endif])], have_gcc46=yes, have_gcc46=no)
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wshorten-64-to-32"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], have_shorten64_flag=yes,
@ -1494,13 +1500,21 @@ if test x$enable_gcc_warnings = xyes || test x$enable_gcc_warnings_advisory = xy
if test x$have_gcc43 = xyes ; then
# These warnings break gcc 4.2 and work on gcc 4.3
# XXXX020 See if any of these work with earlier versions.
CFLAGS="$CFLAGS -Wextra -Warray-bounds -Wlogical-op"
CFLAGS="$CFLAGS -Wextra -Warray-bounds"
fi
if test x$have_gcc46 = xyes ; then
# This warning was added in gcc 4.3, but it appears to generate
# spurious warnings in gcc 4.4. I don't know if it works in 4.5.
CFLAGS="$CFLAGS -Wlogical-op"
fi
if test x$have_shorten64_flag = xyes ; then
CFLAGS="$CFLAGS -Wshorten-64-to-32"
fi
##This will break the world on some 64-bit architectures
# CFLAGS="$CFLAGS -Winline"
fi