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author | Andy Wingo <wingo@pobox.com> | 2021-01-20 21:52:54 +0100 |
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committer | Andy Wingo <wingo@pobox.com> | 2021-01-20 23:03:56 +0100 |
commit | a91b95cca2d397c84f8b9bbd602d40209a7092ce (patch) | |
tree | 2c286a291f5a2b812d6e216be10936f2709d59cf /m4/free.m4 | |
parent | 758b31994cff582c7e8785b4cc2240dbf3573837 (diff) | |
download | guile-a91b95cca2d397c84f8b9bbd602d40209a7092ce.tar.gz |
Update Gnulib to v0.1-4379-g2ef5a9b4b
Also bump required autoconf version to 2.64, as required by Gnulib.
Diffstat (limited to 'm4/free.m4')
-rw-r--r-- | m4/free.m4 | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/m4/free.m4 b/m4/free.m4 new file mode 100644 index 000000000..d671376b0 --- /dev/null +++ b/m4/free.m4 @@ -0,0 +1,49 @@ +# free.m4 serial 5 +# Copyright (C) 2003-2005, 2009-2021 Free Software Foundation, Inc. +# This file is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# Written by Paul Eggert and Bruno Haible. + +AC_DEFUN([gl_FUNC_FREE], +[ + AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) + + dnl In the next release of POSIX, free must preserve errno. + dnl https://www.austingroupbugs.net/view.php?id=385 + dnl https://sourceware.org/bugzilla/show_bug.cgi?id=17924 + dnl So far, we know of three platforms that do this: + dnl * glibc >= 2.33, thanks to the fix for this bug: + dnl <https://sourceware.org/bugzilla/show_bug.cgi?id=17924> + dnl * OpenBSD >= 4.5, thanks to this commit: + dnl <https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/malloc.c.diff?r1=1.100&r2=1.101&f=h> + dnl * Solaris, because its malloc() implementation is based on brk(), + dnl not mmap(); hence its free() implementation makes no system calls. + dnl For other platforms, you can only be sure if they state it in their + dnl documentation, or by code inspection of the free() implementation in libc. + AC_CACHE_CHECK([whether free is known to preserve errno], + [gl_cv_func_free_preserves_errno], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdlib.h> + ]], + [[#if 2 < __GLIBC__ + (33 <= __GLIBC_MINOR__) + #elif defined __OpenBSD__ + #elif defined __sun + #else + #error "'free' is not known to preserve errno" + #endif + ]])], + [gl_cv_func_free_preserves_errno=yes], + [gl_cv_func_free_preserves_errno=no]) + ]) + + case $gl_cv_func_free_preserves_errno in + *yes) ;; + *) REPLACE_FREE=1 ;; + esac +]) + +# Prerequisites of lib/free.c. +AC_DEFUN([gl_PREREQ_FREE], [:]) |