Re: [RFC PATCH v3 1/7] configure: Allow passing extra Objective C compiler flags

[Philippe Mathieu-Daudé]

On 1/12/22 15:09, Philippe Mathieu-Daudé wrote:
> +Emilio
> 
> On 1/12/22 14:46, Philippe Mathieu-Daudé wrote:
>> Anyway, with your/Akihiko/Christian help during review, this flag
>> is not necessary anymore to build softmmu/tools (I still have to
>> figure how to silent the "#pragma FENV_ACCESS" warning in tests),
>> so let forget about this patch (except if we expect macOS ObjC to
>> keep evolving and need a way to pass OBJCFLAGS).
> 
> Apparently Clang equivalent of "#pragma STDC FENV_ACESS ON" is
> "-ffp-model=strict"
> 
> https://clang.llvm.org/docs/UsersManual.html#cmdoption-ffp-model
> 
> I'll see if patching tests/fp/meson.build is sufficient.

This seems to do the job:

-- >8 --
diff --git a/tests/fp/meson.build b/tests/fp/meson.build
index 59776a00a79..b790487648a 100644
--- a/tests/fp/meson.build
+++ b/tests/fp/meson.build
@@ -37,6 +37,12 @@
   '-Wno-error',
 ]

+if cc.get_id() == 'clang' and cc.has_argument('-ffp-model=strict')
+  # Clang does not support '#pragma STDC FENV_ACCESS', but starting
+  # with Clang 10.0 the equivalent is -ffp-model=strict.
+  tfcflags += [ '-ffp-model=strict' ]
+endif
+
 tfgencases = [
   tfdir / 'genCases_ui32.c',
   tfdir / 'genCases_ui64.c',
---