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configure.ac: do not overwrite -std=

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Set -std=gnu99 only when no such compiler flag(s) are set in any
compiler-related environment variables.  This enables users to
specify something more modern, say, -std=c11.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65154 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shyouhei 2018-10-18 09:21:05 +00:00
parent 8183cd2f1d
commit 88a7271de4
1 changed files with 4 additions and 0 deletions
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4
configure.ac
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@ -626,6 +626,9 @@ AS_IF([test "$GCC" = yes], [
], ],
[ [
# ANSI (no XCFLAGS because this is C only) # ANSI (no XCFLAGS because this is C only)
rb_tmp_std_check=`echo $CC $CFLAGS $optflags $warnflags $debugflags | fgrep std= | tr -d '\015'`
AS_IF([test "x$rb_tmp_std_check" = "x"],
[
for ansi_options in -std=gnu99; do for ansi_options in -std=gnu99; do
RUBY_TRY_CFLAGS(${ansi_options}, [ RUBY_TRY_CFLAGS(${ansi_options}, [
RUBY_APPEND_OPTIONS(warnflags, ${ansi_options}) RUBY_APPEND_OPTIONS(warnflags, ${ansi_options})
@ -633,6 +636,7 @@ AS_IF([test "$GCC" = yes], [
], [ansi_options=]) ], [ansi_options=])
test "x${ansi_options}" = x || break test "x${ansi_options}" = x || break
done done
])
]) ])
# suppress annoying -Wstrict-overflow warnings # suppress annoying -Wstrict-overflow warnings