Issue #10350 has been updated by Tomoyuki Chikanaga.

Backport changed from 2.0.0: DONTNEED, 2.1: REQUIRED to 2.0.0: DONTNEED, 2.1: DONE

Backported into `ruby_2_1` at r48303.

----------------------------------------
Bug #10350: compile error in bignum.c line 3297 with old fcc on Solaris
https://bugs.ruby-lang.org/issues/10350#change-49829

* Author: Naohisa Goto
* Status: Closed
* Priority: Normal
* Assignee: Naohisa Goto
* Category: build
* Target version: 
* ruby -v: ruby 2.2.0dev (2014-10-09) [sparc64-solaris2.10]
* Backport: 2.0.0: DONTNEED, 2.1: DONE
----------------------------------------
Solaris上の古い fcc (Fujitsu C compiler) 5.6 にて、以下のコンパイルエラーが発生します。

~~~
"bignum.c", line 3297: error: initialization: constant expression is expected for variable: `nlz_bits_in_msbyte_bary'
~~~

以下のように変数の宣言と初期化を別々にしたらエラーなくビルドできました。

~~~
Index: bignum.c
===================================================================
--- bignum.c    (revision 47859)
+++ bignum.c    (working copy)
@@ -3294,7 +3294,7 @@
     static const BDIGIT char_bit[1] = { CHAR_BIT };
     BDIGIT numbytes_bary[bdigit_roomof(sizeof(numbytes))];
     BDIGIT val_numbits_bary[bdigit_roomof(sizeof(numbytes) + 1)];
-    BDIGIT nlz_bits_in_msbyte_bary[1] = { nlz_bits_in_msbyte };
+    BDIGIT nlz_bits_in_msbyte_bary[1];
     BDIGIT word_numbits_bary[bdigit_roomof(sizeof(word_numbits))];
     BDIGIT div_bary[numberof(val_numbits_bary) + BIGDIVREM_EXTRA_WORDS];
     BDIGIT mod_bary[numberof(word_numbits_bary)];
@@ -3304,6 +3304,8 @@
     int sign;
     size_t numwords;
 
+    nlz_bits_in_msbyte_bary[0] = nlz_bits_in_msbyte;
+
     /*
      * val_numbits = numbytes * CHAR_BIT - nlz_bits_in_msbyte
      * div, mod = val_numbits.divmod(word_numbits)
~~~





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