Re: [edk2-devel] [PATCH V3] DebugLib: Update DEBUG macro used when MDEPKG_NDEBUG is defined

["Ard Biesheuvel" <ardb@kernel.org>]

(cc MdePkg and BaseTools maintainers)

On Thu, 14 Dec 2023 at 00:08, Mike Beaton <mjsbeaton@gmail.com> wrote:
>
> From: Mike Beaton <mjsbeaton@gmail.com>
>
> The variant provided when MDEPKG_NDEBUG is defined will be optimised
> away in RELEASE builds, but by referencing the argument list, avoids
> unused variable errors from valid debug code, for example when STATIC
> variables are used only in DEBUG statements.
>
> Signed-off-by: Mike Beaton <mjsbeaton@gmail.com>

I think this is an improvement, but others should confirm that other
toolchains are happy with this too (the change is no longer specific
to clang)

> ---
>  BaseTools/Conf/tools_def.template | 2 +-
>  MdePkg/Include/Library/DebugLib.h | 7 ++++++-
>  2 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
> index c34ecfd557..eaccf0b698 100755
> --- a/BaseTools/Conf/tools_def.template
> +++ b/BaseTools/Conf/tools_def.template
> @@ -1859,7 +1859,7 @@ DEFINE CLANGDWARF_X64_DLINK2_FLAGS        = -Wl,--defsym=PECOFF_HEADER_SIZE=0x22
>  DEFINE CLANGDWARF_IA32_TARGET             = -target i686-pc-linux-gnu
>  DEFINE CLANGDWARF_X64_TARGET              = -target x86_64-pc-linux-gnu
>
> -DEFINE CLANGDWARF_WARNING_OVERRIDES    = -Wno-parentheses-equality -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
> +DEFINE CLANGDWARF_WARNING_OVERRIDES    = -Wno-parentheses-equality -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
>  DEFINE CLANGDWARF_ALL_CC_FLAGS         = DEF(GCC48_ALL_CC_FLAGS) DEF(CLANGDWARF_WARNING_OVERRIDES) -fno-stack-protector -mms-bitfields -Wno-address -Wno-shift-negative-value -Wno-unknown-pragmas -Wno-incompatible-library-redeclaration -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -msoft-float -mno-implicit-float  -ftrap-function=undefined_behavior_has_been_optimized_away_by_clang -funsigned-char -fno-ms-extensions -Wno-null-dereference
>
>  ###########################
> diff --git a/MdePkg/Include/Library/DebugLib.h b/MdePkg/Include/Library/DebugLib.h
> index 40772f2e0f..bc7789f01c 100644
> --- a/MdePkg/Include/Library/DebugLib.h
> +++ b/MdePkg/Include/Library/DebugLib.h
> @@ -426,7 +426,12 @@ UnitTestDebugAssert (
>        }                            \
>      } while (FALSE)
>  #else
> -#define DEBUG(Expression)
> +#define DEBUG(Expression)        \
> +    do {                           \
> +      if (FALSE) {                 \
> +        _DEBUG (Expression);       \
> +      }                            \
> +    } while (FALSE)
>  #endif
>
>  /**
> --
> 2.39.2
>
>
>
> 
>
>


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