summaryrefslogtreecommitdiffstats
path: root/m4/strtok_r.m4
diff options
context:
space:
mode:
Diffstat (limited to 'm4/strtok_r.m4')
-rw-r--r--m4/strtok_r.m473
1 files changed, 73 insertions, 0 deletions
diff --git a/m4/strtok_r.m4 b/m4/strtok_r.m4
new file mode 100644
index 0000000..b777089
--- /dev/null
+++ b/m4/strtok_r.m4
@@ -0,0 +1,73 @@
+# strtok_r.m4 serial 15
+dnl Copyright (C) 2002-2004, 2006-2007, 2009-2018 Free Software Foundation,
+dnl 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_FUNC_STRTOK_R],
+[
+ dnl The strtok_r() declaration in lib/string.in.h uses 'restrict'.
+ AC_REQUIRE([AC_C_RESTRICT])
+
+ AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CHECK_FUNCS([strtok_r])
+ if test $ac_cv_func_strtok_r = yes; then
+ HAVE_STRTOK_R=1
+ dnl glibc 2.7 has a bug in strtok_r that causes a segmentation fault
+ dnl when the second argument to strtok_r is a constant string that has
+ dnl exactly one byte and compiling with optimization. This bug is, for
+ dnl example, present in the glibc 2.7-18 package in Debian "lenny".
+ dnl See <https://sourceware.org/bugzilla/show_bug.cgi?id=5614>.
+ AC_CACHE_CHECK([whether strtok_r works], [gl_cv_func_strtok_r_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([[
+ #ifndef __OPTIMIZE__
+ # define __OPTIMIZE__ 1
+ #endif
+ #undef __OPTIMIZE_SIZE__
+ #undef __NO_INLINE__
+ #include <stdlib.h>
+ #include <string.h>
+ ]],
+ [[static const char dummy[] = "\177\01a";
+ char delimiters[] = "xxxxxxxx";
+ char *save_ptr = (char *) dummy;
+ strtok_r (delimiters, "x", &save_ptr);
+ strtok_r (NULL, "x", &save_ptr);
+ return 0;
+ ]])
+ ],
+ [gl_cv_func_strtok_r_works=yes],
+ [gl_cv_func_strtok_r_works=no],
+ [case "$host_os" in
+ # Guess no on glibc systems.
+ *-gnu* | gnu*) gl_cv_func_strtok_r_works="guessing no" ;;
+ # Guess yes on native Windows.
+ mingw*) gl_cv_func_strtok_r_works="guessing yes" ;;
+ *) gl_cv_func_strtok_r_works="guessing yes" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_strtok_r_works" in
+ *no)
+ dnl We could set REPLACE_STRTOK_R=1 here, but it's only the macro
+ dnl version in <bits/string2.h> which is wrong. The code compiled
+ dnl into libc is fine.
+ UNDEFINE_STRTOK_R=1
+ ;;
+ esac
+ else
+ HAVE_STRTOK_R=0
+ fi
+ AC_CHECK_DECLS_ONCE([strtok_r])
+ if test $ac_cv_have_decl_strtok_r = no; then
+ HAVE_DECL_STRTOK_R=0
+ fi
+])
+
+# Prerequisites of lib/strtok_r.c.
+AC_DEFUN([gl_PREREQ_STRTOK_R], [
+ :
+])