clang_nowarn_gold_suppress_bison

Clang: Suppress warnings if built with Clang (gold)

• Status: Merged for Binutils 2.40
• Branch: clang-nowarn-gold-suppress-bison
• Tracking PR: #61 (view Pull Request and Diff)
• Mailing List:
  • PATCH v1 (2022-09-26)

Issue Solved

Clang generates a warning if there is a variable that is set but not used otherwise (-Wunused-but-set-variable). On the default configuration, it causes a build failure (unless --disable-werror is specified).

Because the cause of this error is in the Bison-generated code ($(srcdir)/gold/yyscript.y → $(builddir)/gold/yyscript.c), this commit suppresses this warning (-Wunused-but-set-variable) by placing DIAGNOSTIC_IGNORE_UNUSED_BUT_SET_VARIABLE macro at the end of user prologue on yyscript.y.