1*1424dfb3Schristos# strtok_r.m4 serial 15 2*1424dfb3Schristosdnl Copyright (C) 2002-2004, 2006-2007, 2009-2020 Free Software Foundation, 3*1424dfb3Schristosdnl Inc. 4*1424dfb3Schristosdnl This file is free software; the Free Software Foundation 5*1424dfb3Schristosdnl gives unlimited permission to copy and/or distribute it, 6*1424dfb3Schristosdnl with or without modifications, as long as this notice is preserved. 7*1424dfb3Schristos 8*1424dfb3SchristosAC_DEFUN([gl_FUNC_STRTOK_R], 9*1424dfb3Schristos[ 10*1424dfb3Schristos dnl The strtok_r() declaration in lib/string.in.h uses 'restrict'. 11*1424dfb3Schristos AC_REQUIRE([AC_C_RESTRICT]) 12*1424dfb3Schristos 13*1424dfb3Schristos AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) 14*1424dfb3Schristos AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles 15*1424dfb3Schristos AC_CHECK_FUNCS([strtok_r]) 16*1424dfb3Schristos if test $ac_cv_func_strtok_r = yes; then 17*1424dfb3Schristos HAVE_STRTOK_R=1 18*1424dfb3Schristos dnl glibc 2.7 has a bug in strtok_r that causes a segmentation fault 19*1424dfb3Schristos dnl when the second argument to strtok_r is a constant string that has 20*1424dfb3Schristos dnl exactly one byte and compiling with optimization. This bug is, for 21*1424dfb3Schristos dnl example, present in the glibc 2.7-18 package in Debian "lenny". 22*1424dfb3Schristos dnl See <https://sourceware.org/bugzilla/show_bug.cgi?id=5614>. 23*1424dfb3Schristos AC_CACHE_CHECK([whether strtok_r works], [gl_cv_func_strtok_r_works], 24*1424dfb3Schristos [AC_RUN_IFELSE( 25*1424dfb3Schristos [AC_LANG_PROGRAM([[ 26*1424dfb3Schristos #ifndef __OPTIMIZE__ 27*1424dfb3Schristos # define __OPTIMIZE__ 1 28*1424dfb3Schristos #endif 29*1424dfb3Schristos #undef __OPTIMIZE_SIZE__ 30*1424dfb3Schristos #undef __NO_INLINE__ 31*1424dfb3Schristos #include <stdlib.h> 32*1424dfb3Schristos #include <string.h> 33*1424dfb3Schristos ]], 34*1424dfb3Schristos [[static const char dummy[] = "\177\01a"; 35*1424dfb3Schristos char delimiters[] = "xxxxxxxx"; 36*1424dfb3Schristos char *save_ptr = (char *) dummy; 37*1424dfb3Schristos strtok_r (delimiters, "x", &save_ptr); 38*1424dfb3Schristos strtok_r (NULL, "x", &save_ptr); 39*1424dfb3Schristos return 0; 40*1424dfb3Schristos ]]) 41*1424dfb3Schristos ], 42*1424dfb3Schristos [gl_cv_func_strtok_r_works=yes], 43*1424dfb3Schristos [gl_cv_func_strtok_r_works=no], 44*1424dfb3Schristos [case "$host_os" in 45*1424dfb3Schristos # Guess no on glibc systems. 46*1424dfb3Schristos *-gnu* | gnu*) gl_cv_func_strtok_r_works="guessing no" ;; 47*1424dfb3Schristos # Guess yes on native Windows. 48*1424dfb3Schristos mingw*) gl_cv_func_strtok_r_works="guessing yes" ;; 49*1424dfb3Schristos *) gl_cv_func_strtok_r_works="guessing yes" ;; 50*1424dfb3Schristos esac 51*1424dfb3Schristos ]) 52*1424dfb3Schristos ]) 53*1424dfb3Schristos case "$gl_cv_func_strtok_r_works" in 54*1424dfb3Schristos *no) 55*1424dfb3Schristos dnl We could set REPLACE_STRTOK_R=1 here, but it's only the macro 56*1424dfb3Schristos dnl version in <bits/string2.h> which is wrong. The code compiled 57*1424dfb3Schristos dnl into libc is fine. 58*1424dfb3Schristos UNDEFINE_STRTOK_R=1 59*1424dfb3Schristos ;; 60*1424dfb3Schristos esac 61*1424dfb3Schristos else 62*1424dfb3Schristos HAVE_STRTOK_R=0 63*1424dfb3Schristos fi 64*1424dfb3Schristos AC_CHECK_DECLS_ONCE([strtok_r]) 65*1424dfb3Schristos if test $ac_cv_have_decl_strtok_r = no; then 66*1424dfb3Schristos HAVE_DECL_STRTOK_R=0 67*1424dfb3Schristos fi 68*1424dfb3Schristos]) 69*1424dfb3Schristos 70*1424dfb3Schristos# Prerequisites of lib/strtok_r.c. 71*1424dfb3SchristosAC_DEFUN([gl_PREREQ_STRTOK_R], [ 72*1424dfb3Schristos : 73*1424dfb3Schristos]) 74