Update lib/regex from glibc via Gnulib

This syncs recent refactorings from glibc, and incorporates:
2018-10-15 libc-config: merge from glibc
2018-10-15 regex: depend on libc-config
* .gitignore: Do not ignore m4/_*.m4.
* lib/cdefs.h: New file, copied from Gnulib.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
* lib/libc-config.h, m4/__inline.m4: New files, copied from Gnulib.
* lib/regcomp.c, lib/regex.c, lib/regex_internal.c:
* lib/regex_internal.h, lib/regexec.c:
Copy from glibc via Gnulib.

2 files changed, 38 insertions, 0 deletions

diff --git a/m4/__inline.m4 b/m4/__inline.m4
new file mode 100644
index 00000000000..3d0c4798997
--- /dev/null
+++ b/m4/__inline.m4
@@ -0,0 +1,22 @@
+# Test for __inline keyword
+dnl Copyright 2017-2018 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl___INLINE],
+[
+  AC_CACHE_CHECK([whether the compiler supports the __inline keyword],
+    [gl_cv_c___inline],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+         [[typedef int foo_t;
+           static __inline foo_t foo (void) { return 0; }]],
+         [[return foo ();]])],
+       [gl_cv_c___inline=yes],
+       [gl_cv_c___inline=no])])
+  if test $gl_cv_c___inline = yes; then
+    AC_DEFINE([HAVE___INLINE], [1],
+      [Define to 1 if the compiler supports the keyword '__inline'.])
+  fi
+])
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 61aabaa3427..74f28178ffc 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -109,6 +109,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module inttypes-incomplete:
   # Code from module largefile:
   AC_REQUIRE([AC_SYS_LARGEFILE])
+  # Code from module libc-config:
   # Code from module limits-h:
   # Code from module localtime-buffer:
   # Code from module lstat:
@@ -441,6 +442,7 @@ AC_DEFUN([gl_INIT],
   gl_gnulib_enabled_getgroups=false
   gl_gnulib_enabled_be453cec5eecf5731a274f2de7f2db36=false
   gl_gnulib_enabled_a9786850e999ae65a836a6041e8e5ed1=false
+  gl_gnulib_enabled_21ee726a3540c09237a8e70c0baf7467=false
   gl_gnulib_enabled_2049e887c7e5308faad27b3f894bb8c9=false
   gl_gnulib_enabled_5264294aa0a5557541b53c8c741f7f31=false
   gl_gnulib_enabled_open=false
@@ -554,6 +556,13 @@ AC_DEFUN([gl_INIT],
       fi
     fi
   }
+  func_gl_gnulib_m4code_21ee726a3540c09237a8e70c0baf7467 ()
+  {
+    if ! $gl_gnulib_enabled_21ee726a3540c09237a8e70c0baf7467; then
+      gl___INLINE
+      gl_gnulib_enabled_21ee726a3540c09237a8e70c0baf7467=true
+    fi
+  }
   func_gl_gnulib_m4code_2049e887c7e5308faad27b3f894bb8c9 ()
   {
     if ! $gl_gnulib_enabled_2049e887c7e5308faad27b3f894bb8c9; then
@@ -669,6 +678,9 @@ AC_DEFUN([gl_INIT],
   if test $ac_use_included_regex = yes; then
     func_gl_gnulib_m4code_37f71b604aa9c54446783d80f42fe547
   fi
+  if test $ac_use_included_regex = yes; then
+    func_gl_gnulib_m4code_21ee726a3540c09237a8e70c0baf7467
+  fi
   if { test $HAVE_DECL_STRTOIMAX = 0 || test $REPLACE_STRTOIMAX = 1; } && test $ac_cv_type_long_long_int = yes; then
     func_gl_gnulib_m4code_strtoll
   fi
@@ -686,6 +698,7 @@ AC_DEFUN([gl_INIT],
   AM_CONDITIONAL([gl_GNULIB_ENABLED_getgroups], [$gl_gnulib_enabled_getgroups])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_be453cec5eecf5731a274f2de7f2db36], [$gl_gnulib_enabled_be453cec5eecf5731a274f2de7f2db36])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_a9786850e999ae65a836a6041e8e5ed1], [$gl_gnulib_enabled_a9786850e999ae65a836a6041e8e5ed1])
+  AM_CONDITIONAL([gl_GNULIB_ENABLED_21ee726a3540c09237a8e70c0baf7467], [$gl_gnulib_enabled_21ee726a3540c09237a8e70c0baf7467])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_2049e887c7e5308faad27b3f894bb8c9], [$gl_gnulib_enabled_2049e887c7e5308faad27b3f894bb8c9])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_5264294aa0a5557541b53c8c741f7f31], [$gl_gnulib_enabled_5264294aa0a5557541b53c8c741f7f31])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_open], [$gl_gnulib_enabled_open])
@@ -858,6 +871,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/c-strncasecmp.c
   lib/careadlinkat.c
   lib/careadlinkat.h
+  lib/cdefs.h
   lib/cloexec.c
   lib/cloexec.h
   lib/close-stream.c
@@ -920,6 +934,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/ignore-value.h
   lib/intprops.h
   lib/inttypes.in.h
+  lib/libc-config.h
   lib/limits.in.h
   lib/localtime-buffer.c
   lib/localtime-buffer.h
@@ -1002,6 +1017,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/warn-on-use.h
   lib/xalloc-oversized.h
   m4/00gnulib.m4
+  m4/__inline.m4
   m4/absolute-header.m4
   m4/acl.m4
   m4/alloca.m4