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Bug #15293
closed
Since r64852, on Solaris with Oracle Developer Studio 12.4, syntax error
Description
r64852以降、Solaris 10 上の Oracle Developer Studio 12.4 にてコンパイルすると、以下のエラーで array.c のコンパイルに失敗します。（r65641 にて確認）
cc -errtags=yes -xO4 -xtarget=sparc64xplus -m64 -DRUBY_DEVEL=1 -DRUBY_EXPORT -DCANONICALIZATION_FOR_MATHN -I/usr/local/64/lib/libffi-3.0.10/include -I/usr/local/64/include -D_XOPEN_SOURCE=500 -I. -I.ext/include/sparc64-solaris2.10 -I./include -I. -I./enc/unicode/10.0.0 -o array.o -c array.c
"array.c", line 2977: warning: implicit function declaration: __extension__ (E_NO_IMPLICIT_DECL_ALLOWED)
"array.c", line 2977: syntax error before or at: {
"array.c", line 2977: undefined symbol: rb_intern_id_cache
"array.c", line 2977: undefined symbol: rb_intern_id_cache
"array.c", line 2977: syntax error before or at: )
"array.c", line 2977: warning: old-style declaration or incorrect type for: rb_intern (E_OLD_STYLE_DECL_OR_BAD_TYPE)
"array.c", line 2977: identifier redeclared: rb_intern
current : function() returning int
previous: function(pointer to const char) returning unsigned long : "./include/ruby/ruby.h", line 1792
"array.c", line 2977: warning: old-style declaration or incorrect type for: sort_by_i (E_OLD_STYLE_DECL_OR_BAD_TYPE)
"array.c", line 2977: identifier redeclared: sort_by_i
current : int
previous: function(unsigned long, unsigned long, int, pointer to const unsigned long, unsigned long) returning unsigned long : "array.c", line 2949
"array.c", line 2977: warning: syntax error: empty declaration (E_EMPTY_DECLARATION)
"array.c", line 2978: warning: function prototype parameters must have types (E_FUNC_PROTO_REQ_TYPES)
"array.c", line 2978: warning: old-style declaration or incorrect type for: rb_ary_replace (E_OLD_STYLE_DECL_OR_BAD_TYPE)
"array.c", line 2978: identifier redeclared: rb_ary_replace
current : function() returning int
previous: function(unsigned long, unsigned long) returning unsigned long : "./include/ruby/intern.h", line 96
"array.c", line 2979: syntax error before or at: return
"array.c", line 2979: warning: old-style declaration or incorrect type for: ary (E_OLD_STYLE_DECL_OR_BAD_TYPE)
"array.c", line 3760: identifier redeclared: rb_ary_replace
current : function(unsigned long, unsigned long) returning unsigned long
previous: function() returning int : "array.c", line 2978
"array.c", line 6363: warning: statement not reached (E_STATEMENT_NOT_REACHED)
"array.c", line 6409: warning: statement not reached (E_STATEMENT_NOT_REACHED)
cc: acomp failed for array.c
make: *** [array.o] Error 2
理由は、[Bug #12397] と同じです。
Oracle Solaris Studio 12.4 には、__builtin_constant_p() は存在するため、HAVE_BUILTIN___BUILTIN_CONSTANT_P は 1 になります。しかし、__extension__ は存在しません。（GCC拡張？）
このため、__extension__ が普通の関数と見なされ、syntax error が発生しています。
つまり、r64582 だけでは条件を網羅できておらず不完全であり、__extension__ の有無と（直下のコメント行に書かれているように）statement expression の有無に関する条件も追加する必要があると思います。
[Bug #12397] にも少し書いたように、configure で __extension__ や statement expression の有無をチェックするようにするのがベストとは思います。
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