Issue #15319 has been updated by nobu (Nobuyoshi Nakada).


Makefile.inの呼び出し側で `indent=$${archs:+'  '} define_arch_flags` と渡すのはどうでしょうか。

----------------------------------------
Bug #15319: Since r65735, tool/mjit_archflag.sh related error on Solaris 10
https://bugs.ruby-lang.org/issues/15319#change-74998

* Author: ngoto (Naohisa Goto)
* Status: Open
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
r65735以降、手元の Solaris 10 上でのコンパイルがエラーになります。
コンパイラは gcc, Oracle Developer Studio のどちらでもダメでした。

r65738においてのgccでの最後の方のコンパイル時の出力を抜粋すると以下の通りです。

~~~
gcc -O -m64 -D_FORTIFY_SOURCE=2 -fstack-protector -fno-strict-overflow -DRUBY_DEVEL=1 -fvisibility=hidden -fexcess-precision=standard -DRUBY_EXPORT -fPIE -DCANONICALIZATION_FOR_MATHN -I/usr/local/64/lib/libffi-3.0.10/include -I/usr/local/64/include  -std=gnu99 -D_XOPEN_SOURCE=600   -I. -I.ext/include/sparc64-solaris2.10 -I./include -I. -I./enc/unicode/10.0.0  -o math.o -c math.c
+ echo #ifndef RUBY_MJIT_CONFIG_H 
+ echo #define RUBY_MJIT_CONFIG_H 1 
+ echo 
sep=
+ quote MJIT_MIN_HEADER_NAME /include/ruby-2.6.0/sparc64-solaris2.10/rb_mjit_min_header-2.6.0.h 
+ printf #define MJIT_MIN_HEADER_NAME 
+ shift 
+ printf  "%s" /include/ruby-2.6.0/sparc64-solaris2.10/rb_mjit_min_header-2.6.0.h 
+ echo 
sep=,
+ quote MJIT_CC_COMMON   /usr/local/64/bin/gcc 
+ printf #define MJIT_CC_COMMON   
+ shift 
+ printf  "%s", /usr/local/64/bin/gcc 
+ echo 
+ quote MJIT_CFLAGS      MJIT_ARCHFLAG -w 
+ printf #define MJIT_CFLAGS      MJIT_ARCHFLAG 
+ shift 
+ printf  "%s", -w 
+ echo 
+ quote MJIT_OPTFLAGS    -O3 
+ printf #define MJIT_OPTFLAGS    
+ shift 
+ printf  "%s", -O3 
+ echo 
+ quote MJIT_DEBUGFLAGS  -ggdb3 
+ printf #define MJIT_DEBUGFLAGS  
+ shift 
+ printf  "%s", -ggdb3 
+ echo 
+ quote MJIT_LDSHARED    /usr/local/64/bin/gcc -shared 
+ printf #define MJIT_LDSHARED    
+ shift 
+ printf  "%s", /usr/local/64/bin/gcc -shared 
+ echo 
+ quote MJIT_DLDFLAGS    MJIT_ARCHFLAG -L/usr/local/64/lib -R/usr/local/64/lib 
+ printf #define MJIT_DLDFLAGS    MJIT_ARCHFLAG 
+ shift 
+ printf  "%s", -L/usr/local/64/lib -R/usr/local/64/lib 
+ echo 
+ quote MJIT_LIBS        -Wl,-rpath,/XXXXXXXXXX/lib -L/XXXXXXXXXX/lib 
+ printf #define MJIT_LIBS        
+ shift 
+ printf  "%s", -Wl,-rpath,/XXXXXXXXXX/lib -L/XXXXXXXXXX/lib 
+ echo 
+ quote PRELOADENV       "LD_PRELOAD_64" 
+ printf #define PRELOADENV       "LD_PRELOAD_64" 
+ shift 
+ echo 
+ } define_arch_flags 
/bin/sh: }: not found
+ echo 
+ echo #endif /* RUBY_MJIT_CONFIG_H */ 
gcc -O -m64 -D_FORTIFY_SOURCE=2 -fstack-protector -fno-strict-overflow -DRUBY_DEVEL=1 -fvisibility=hidden -fexcess-precision=standard -DRUBY_EXPORT -fPIE -DCANONICALIZATION_FOR_MATHN -I/usr/local/64/lib/libffi-3.0.10/include -I/usr/local/64/include  -std=gnu99 -D_XOPEN_SOURCE=600   -I. -I.ext/include/sparc64-solaris2.10 -I./include -I. -I./enc/unicode/10.0.0  -o mjit.o -c mjit.c
In file included from mjit.c:18:0:
mjit_worker.c:242:20: error: 'MJIT_ARCHFLAG' undeclared here (not in a function)
mjit_worker.c:242:20: error: expected '}' before string constant
mjit_worker.c:255:5: error: initializer element is not constant
mjit_worker.c:255:5: error: (near initialization for 'CC_DLDFLAGS_ARGS[0]')
mjit_worker.c:255:5: error: expected '}' before string constant
make: *** [mjit.o] Error 1
~~~

`/bin/sh: }: not found` というのがSolarisの/bin/shが出したエラーのようですが、これはMakefile.in (から作成されたMakefile)内の mjit_config.h を作成する部分の `@{` に対応した `}` のような気がします。
もしかすると /bin/sh ではなく make 側の問題の可能性もあるでしょうか?

以下のバージョンのGNU Make を使っています。

~~~
$ /usr/local/bin/make --version
GNU Make 3.82
Built for sparc-sun-solaris2.10
Copyright (C) 2010  Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
~~~



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