bug#20819: [PATCH] i18n: check for non-POSIX strtol_l

[Natanael Copa]

* configure.ac: Check for strtol_l
* libguile/i18n.c: Check with HAVE_STRTOL_L before using strtol_l. This
  fixes build with musl libc.
---
 configure.ac    | 5 +++--
 libguile/i18n.c | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 19e00d8..b73a0db 100644
--- a/configure.ac
+++ b/configure.ac
@@ -752,6 +752,7 @@ AC_CHECK_HEADERS([assert.h crt_externs.h])
 #   isblank - available as a GNU extension or in C99
 #   _NSGetEnviron - Darwin specific
 #   strcoll_l, newlocale, uselocale, utimensat - POSIX.1-2008
+#   strtol_l - non-POSIX, found in glibc and BSD
 #   fork - unavailable on Windows
 #   sched_getaffinity, sched_setaffinity - GNU extensions (glibc)
 #   sendfile - non-POSIX, found in glibc
@@ -765,8 +766,8 @@ AC_CHECK_FUNCS([DINFINITY DQNAN cexp chsize clog clog10 
ctermid             \
   strdup system usleep atexit on_exit chown link fcntl ttyname getpwent        
\
   getgrent kill getppid getpgrp fork setitimer getitimer strchr strcmp \
   index bcopy memcpy rindex truncate unsetenv isblank _NSGetEnviron    \
-  strcoll strcoll_l newlocale uselocale utimensat sched_getaffinity    \
-  sched_setaffinity sendfile])
+  strcoll strcoll_l strtol_l newlocale uselocale utimensat             \
+  sched_getaffinity sched_setaffinity sendfile])
 
 # Reasons for testing:
 #   netdb.h - not in mingw
diff --git a/libguile/i18n.c b/libguile/i18n.c
index f0e3443..17e9eca 100644
--- a/libguile/i18n.c
+++ b/libguile/i18n.c
@@ -1373,7 +1373,7 @@ SCM_DEFINE (scm_locale_string_to_integer, 
"locale-string->integer",
 
   if (c_locale != NULL)
     {
-#ifdef USE_GNU_LOCALE_API
+#if defined(USE_GNU_LOCALE_API) && defined(HAVE_STRTOL_L)
       c_result = strtol_l (c_str, &c_endptr, c_base, c_locale);
 #else
       RUN_IN_LOCALE_SECTION (c_locale,
-- 
2.4.3