commit 56bdc844ba68ac0911efc7ad3398f1eafeaaac76 Author: Steven Murdoch <Steven.Murdoch@cl.cam.ac.uk> Date: Wed Mar 9 19:05:51 2011 +0000 Fix compilation under LLVM/clang with --enable-gcc-warnings - When compiling using clang (2.9 or lower) do not enable -Wnormalized=id or -Woverride-init when --enable-gcc-warnings or --enable-gcc-warnings-advisory is set as these options are unsupported. --- configure.in | 17 +++++++++++++++-- 1 files changed, 15 insertions(+), 2 deletions(-) diff --git a/configure.in b/configure.in index f30402d..9999f60 100644 --- a/configure.in +++ b/configure.in @@ -894,6 +894,11 @@ 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(__clang__) || (__clang_major__ > 2) || (__clang_major__ == 2 && __clang_minor__ > 9) +#error +#endif])], have_clang29orlower=yes, have_clang29orlower=no) + save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -Wshorten-64-to-32" AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], have_shorten64_flag=yes, @@ -924,11 +929,19 @@ if test x$enable_gcc_warnings = xyes || test x$enable_gcc_warnings_advisory = xy if test x$have_gcc42 = xyes ; then # These warnings break gcc 4.0.2 and work on gcc 4.2 # XXXX020 See if any of these work with earlier versions. - CFLAGS="$CFLAGS -Waddress -Wmissing-noreturn -Wnormalized=id -Woverride-init -Wstrict-overflow=1" + CFLAGS="$CFLAGS -Waddress -Wmissing-noreturn -Wstrict-overflow=1" + # We used to use -Wstrict-overflow=5, but that breaks us heavily under 4.3. fi - if test x$have_gcc43 = xyes ; then + if test x$have_gcc42 = xyes && test x$have_clang29orlower = xno; then + # These warnings break gcc 4.0.2 and clang, but work on gcc 4.2 + # We only disable these for clang 2.9 and lower, in case they are + # supported in later versions. + CFLAGS="$CFLAGS -Wnormalized=id -Woverride-init" + fi + + if test x$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"