Re: [edk2-devel] [PATCH] BaseTools/tools_def: Disable unneeded-internal-declaration warning in CLANGPDB

["Mike Beaton" <mjsbeaton@gmail.com>]

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I believe this would be logically wrong, as the other versions still
wouldn't compile if you changed the relevant debug Pcds. (Which are
logically independent of the compile and link options - e.g. what if for
some reason you wanted to single step with the Debug Pcds set to disabled,
in a NOOPT build?)




On Mon, 11 Dec 2023, 15:00 Laszlo Ersek, <lersek@redhat.com> wrote:

> On 12/10/23 11:18, Mike Beaton wrote:
> > From: Mike Beaton <mjsbeaton@gmail.com>
> >
> > This warning was already disabled in CLANGDWARF by commit
> > d3225577123767fd09c91201d27e9c91663ae132.
> >
> > gcc can distinguish between optimised-away variable usage (as  can occur
> in
> > valid debug code) and genuinely unused variables, and only complains
> about
> > the latter. clang cannot, and therefore this warning ends up complaining
> > about valid debug code under clang.
> >
> > Since EDK-II code is in general going to be compiled by gcc as well as
> clang
> > then disabling this warning in clang does not amount to entirely removing
> > potentially valid warnings about genuinely unused variables.
> >
> > Signed-off-by: Mike Beaton <mjsbeaton@gmail.com>
> > ---
> >  BaseTools/Conf/tools_def.template | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/BaseTools/Conf/tools_def.template
> b/BaseTools/Conf/tools_def.template
> > index c34ecfd557..48cf45245f 100755
> > --- a/BaseTools/Conf/tools_def.template
> > +++ b/BaseTools/Conf/tools_def.template
> > @@ -1754,7 +1754,7 @@ DEFINE CLANGPDB_X64_PREFIX           =
> ENV(CLANG_BIN)
> >  DEFINE CLANGPDB_IA32_TARGET          = -target i686-unknown-windows-gnu
> >  DEFINE CLANGPDB_X64_TARGET           = -target
> x86_64-unknown-windows-gnu
> >
> > -DEFINE CLANGPDB_WARNING_OVERRIDES    = -Wno-parentheses-equality
> -Wno-tautological-compare -Wno-tautological-constant-out-of-range-compare
> -Wno-empty-body -Wno-unused-const-variable -Wno-varargs
> -Wno-unknown-warning-option -Wno-unused-but-set-variable
> -Wno-unused-const-variable -Wno-unaligned-access
> -Wno-microsoft-enum-forward-reference
> > +DEFINE CLANGPDB_WARNING_OVERRIDES    = -Wno-parentheses-equality
> -Wno-tautological-compare -Wno-tautological-constant-out-of-range-compare
> -Wno-empty-body -Wno-unused-const-variable -Wno-varargs
> -Wno-unknown-warning-option -Wno-unused-but-set-variable
> -Wno-unused-const-variable -Wno-unaligned-access
> -Wno-unneeded-internal-declaration -Wno-microsoft-enum-forward-reference
> >  DEFINE CLANGPDB_ALL_CC_FLAGS         = DEF(GCC48_ALL_CC_FLAGS)
> DEF(CLANGPDB_WARNING_OVERRIDES) -fno-stack-protector -funsigned-char
> -ftrap-function=undefined_behavior_has_been_optimized_away_by_clang
> -Wno-address -Wno-shift-negative-value -Wno-unknown-pragmas
> -Wno-incompatible-library-redeclaration -Wno-null-dereference
> -mno-implicit-float -mms-bitfields -mno-stack-arg-probe -nostdlib
> -nostdlibinc -fseh-exceptions
> >
> >  ###########################
>
> AFAICT, CLANGPDB_WARNING_OVERRIDES gets included in
> CLANGPDB_ALL_CC_FLAGS, which in turn gets included in all three of
> DEBUG, RELEASE and NOOPT build target flags.
>
> The original report was "RELEASE CLANGPDB OVMF currently does not compile".
>
> Can we use "-Wno-unneeded-internal-declaration" with RELEASE builds only?
>
> Thanks,
> Laszlo
>
>


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