Bug 299589 – [JSC][Flatpak SDK] Error building unifdef with GCC 15.x

• Component: CMake
• Status: RESOLVED FIXED

[Adrian Perez]

Command to reproduce:

% CC= CXX= ./Tools/Scripts/build-webkit --jsc-only --cmakeargs='-DENABLE_JSC_GLIB_API=ON' --no-fatal-warnings

Error:

../../../Source/ThirdParty/unifdef/unifdef.c:205:1: warning: ‘constexpr’ is not at beginning of declaration [-Wold-style-declaration]
  205 | static bool             constexpr;              /* constant #if expression */
      | ^~~~~~
../../../Source/ThirdParty/unifdef/unifdef.c:205:1: warning: useless type name in empty declaration
../../../Source/ThirdParty/unifdef/unifdef.c:205:1: error: ‘constexpr’ in empty declaration
../../../Source/ThirdParty/unifdef/unifdef.c: In function ‘eval_unary’:
../../../Source/ThirdParty/unifdef/unifdef.c:1089:27: error: expected identifier or ‘(’ before ‘=’ token
 1089 |                 constexpr = false;
      |                           ^
../../../Source/ThirdParty/unifdef/unifdef.c:1106:27: error: expected identifier or ‘(’ before ‘=’ token
 1106 |                 constexpr = false;
      |                           ^
../../../Source/ThirdParty/unifdef/unifdef.c: In function ‘ifeval’:
../../../Source/ThirdParty/unifdef/unifdef.c:1173:19: error: expected identifier or ‘(’ before ‘=’ token
 1173 |         constexpr = killconsts ? false : true;
      |                   ^
../../../Source/ThirdParty/unifdef/unifdef.c:1176:27: error: expected specifier-qualifier-list before ‘?’ token
 1176 |         return (constexpr ? LT_IF : ret == LT_ERROR ? LT_IF : ret);
      |                           ^
../../../Source/ThirdParty/unifdef/unifdef.c:1169:18: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
 1169 |         Linetype ret;
      |                  ^~~
../../../Source/ThirdParty/unifdef/unifdef.c: In function ‘debug’:
../../../Source/ThirdParty/unifdef/unifdef.c:1660:17: warning: function ‘debug’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
 1660 |                 vwarnx(msg, ap);
      |                 ^~~~~~

[Adrian Perez]

Pull request: https://github.com/WebKit/WebKit/pull/51373

[EWS]

Committed 300574@main (e33b18bc59d6): <https://commits.webkit.org/300574@main>

Reviewed commits have been landed. Closing PR #51373 and removing active labels.