Quoting Emil Velikov (2018-10-24 10:57:00) > Seemingly that at some point clang started accepting _any_ flags, > whereas previously it would error out. > > These days, you can give it -Whamsandwich and it will succeed, while > at the same time throwing an annoying warning. > > Add -Werror so that everything gets flagged and set accordingly. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108082 > Cc: Eric Engestrom <[email protected]> > Cc: Dylan Baker <[email protected]> > Cc: Vinson Lee <[email protected]> > Repored-by: Vinson Lee <[email protected]> > Signed-off-by: Emil Velikov <[email protected]> > --- > m4/ax_check_compile_flag.m4 | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4 > index 51df0c09a7a..0fdca907e8b 100644 > --- a/m4/ax_check_compile_flag.m4 > +++ b/m4/ax_check_compile_flag.m4 > @@ -55,6 +55,11 @@ > # modified version of the Autoconf Macro, you may extend this special > # exception to the GPL to apply to your modified version as well. > > +# Emil: > +# Toggle Werror since at some point clang started treating unknown -W > +# flags as warnings, succeeding with the build, yet issuing an annoying > +# warning. > + > #serial 3 > > AC_DEFUN([AX_CHECK_COMPILE_FLAG], > @@ -62,7 +67,7 @@ AC_DEFUN([AX_CHECK_COMPILE_FLAG], > AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl > AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ > ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS > - _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" > + _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1 -Werror" > AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], > [AS_VAR_SET(CACHEVAR,[yes])], > [AS_VAR_SET(CACHEVAR,[no])]) > -- > 2.19.1 >
This seems like the most straightforward way to solve the issue, since otherwise you need to track which compiler you have. Reviewed-by: Dylan Baker <[email protected]>
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