Add fatal=False to many mlog.warnings()

There are lots of warnings that become fatal, that are simply unfixable
by the end user. Things like using old versions of software (because
they're using some kind of LTS release), warnings about compilers not
supporting certain kinds of checks, or standards being upgraded due to
skipped implementations (MSVC has c++98 and c++14, but not c++11). None
of these should be fatal, they're informative, and too important to
reduce to notices, but not important enough to stop meson if they're
printed.

1 files changed, 4 insertions, 3 deletions

diff --git a/mesonbuild/compilers/cpp.py b/mesonbuild/compilers/cpp.py
index 7296626..5789bb5 100644
--- a/mesonbuild/compilers/cpp.py
+++ b/mesonbuild/compilers/cpp.py
@@ -59,7 +59,7 @@ def non_msvc_eh_options(eh: str, args: T.List[str]) -> None:
         args.append('-fno-exceptions')
     elif eh in {'s', 'c'}:
         mlog.warning(f'non-MSVC compilers do not support {eh} exception handling. '
-                     'You may want to set eh to \'default\'.')
+                     'You may want to set eh to \'default\'.', fatal=False)
 
 class CPPCompiler(CLikeCompiler, Compiler):
     def attribute_check_func(self, name: str) -> str:
@@ -692,7 +692,8 @@ class CPP11AsCPP14Mixin(CompilerMixinBase):
         key = OptionKey('std', machine=self.for_machine, lang=self.language)
         if options[key].value in {'vc++11', 'c++11'}:
             mlog.warning(self.id, 'does not support C++11;',
-                         'attempting best effort; setting the standard to C++14', once=True)
+                         'attempting best effort; setting the standard to C++14',
+                         once=True, fatal=False)
             # Don't mutate anything we're going to change, we need to use
             # deepcopy since we're messing with members, and we can't simply
             # copy the members because the option proxy doesn't support it.
@@ -732,7 +733,7 @@ class VisualStudioCPPCompiler(CPP11AsCPP14Mixin, VisualStudioLikeCPPCompilerMixi
     def get_option_compile_args(self, options: 'KeyedOptionDictType') -> T.List[str]:
         key = OptionKey('std', machine=self.for_machine, lang=self.language)
         if options[key].value != 'none' and version_compare(self.version, '<19.00.24210'):
-            mlog.warning('This version of MSVC does not support cpp_std arguments')
+            mlog.warning('This version of MSVC does not support cpp_std arguments', fatal=False)
             options = copy.copy(options)
             options[key].value = 'none'