merge revision(s) 329c89bb42bb44467588afc1d41d9f99172dfeb5:

	Make implicit function declaration error [Feature #18615]

	Enable `-Werror=implicit-function-declaration` by default for
	building C extensions for early failures.
	---
	 lib/mkmf.rb | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

2 files changed, 2 insertions, 2 deletions

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 013a117670..dc6d66d269 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2587,7 +2587,7 @@ site-install-rb: install-rb
 
     if $warnflags = CONFIG['warnflags'] and CONFIG['GCC'] == 'yes'
       # turn warnings into errors only for bundled extensions.
-      config['warnflags'] = $warnflags.gsub(/(\A|\s)-Werror[-=]/, '\1-W')
+      config['warnflags'] = $warnflags.gsub(/(?:\A|\s)-W\Kerror[-=](?!implicit-function-declaration)/, '')
       if /icc\z/ =~ config['CC']
         config['warnflags'].gsub!(/(\A|\s)-W(?:division-by-zero|deprecated-declarations)/, '\1')
       end
diff --git a/version.h b/version.h
index 8d6bb6c43d..b7cea696ed 100644
--- a/version.h
+++ b/version.h
@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 3
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 123
+#define RUBY_PATCHLEVEL 124
 
 #define RUBY_RELEASE_YEAR 2022
 #define RUBY_RELEASE_MONTH 10