[Webkit-unassigned] [Bug 235737] New: [CMake] Do not require GNU Gold usage to enable DEBUG_FISSION

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Jan 27 14:45:20 PST 2022


            Bug ID: 235737
           Summary: [CMake] Do not require GNU Gold usage to enable
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CMake
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com

As per my comment at https://bugs.webkit.org/show_bug.cgi?id=235476#c4
all of ld.bfd, lld, and mold support split-debug builds, and there is
not reason whatsoever to make the DEBUG_FISSION option depend on the
value of the USE_LD_GOLD one.

   % cat hello.cc         
   #include <cstdio>
   extern const char* whom();
   int main() { std::printf("Hello, %s!\n", whom()); }
   % cat other.cc         
   const char* whom() { return "Pete"; }
   % g++ -gsplit-dwarf -ggdb -c hello.cc                  
   % g++ -gsplit-dwarf -ggdb -c other.cc  
   % g++ -gsplit-dwarf -ggdb -fuse-ld=bfd -o hello hello.o other.o        
   % dwarfdump hello | grep DW_AT_dwo_name | sort -u 
                    DW_AT_dwo_name              hello.dwo
                    DW_AT_dwo_name              other.dwo

(Replacing g++ with clang++ above also works, plus the Clang compiler
driver will happily accept any -fuse-ld=whatever as long as there is
a “ld.whatever” binary in the $PATH.)

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