k0kubun	2018-12-28 18:23:27 +0900 (Fri, 28 Dec 2018)

  New Revision: 66605

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66605

  Log:
    configure.ac: try to fix addr2line build failure
    
    https://rubyci.org/logs/rubyci.s3.amazonaws.com/debian8/ruby-trunk/log/20181228T063002Z.fail.html.gz
    https://rubyci.org/logs/rubyci.s3.amazonaws.com/scw-9d6766/ruby-trunk/log/20181228T081706Z.fail.html.gz
    https://rubyci.org/logs/rubyci.s3.amazonaws.com/gentoo/ruby-trunk/log/20181228T063002Z.fail.html.gz
    https://rubyci.org/logs/rubyci.s3.amazonaws.com/centos6/ruby-trunk/log/20181228T063003Z.fail.html.gz
    https://rubyci.org/logs/rubyci.s3.amazonaws.com/centos7/ruby-trunk/log/20181228T080003Z.fail.html.gz
    https://rubyci.org/logs/rubyci.s3.amazonaws.com/opensuseleap/ruby-trunk/log/20181228T080002Z.fail.html.gz
    https://rubyci.org/logs/rubyci.s3.amazonaws.com/rhel_zlinux/ruby-trunk/log/20181228T063303Z.fail.html.gz
    https://rubyci.org/logs/rubyci.s3.amazonaws.com/icc-x64/ruby-trunk/log/20181228T090003Z.fail.html.gz
    
    I suspect r66598 triggered something.

  Modified files:
    trunk/configure.ac
Index: configure.ac
===================================================================
--- configure.ac	(revision 66604)
+++ configure.ac	(revision 66605)
@@ -187,7 +187,7 @@ AS_IF([test x"${build}" != x"${host}"], https://github.com/ruby/ruby/blob/trunk/configure.ac#L187
   AC_CHECK_TOOL(CC, gcc)
 ])
 
-AC_PROG_CC
+AC_PROG_CC_C99
 AS_CASE([$CC],
 [gcc-*], [
     gcc_prefix=gcc- gcc_suffix=`echo "$CC" | sed 's/^gcc//'`

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