From 27e6afeb6fe1f0b9f083fdfeacf6d69c6936a34a Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Fri, 24 Apr 2015 22:39:47 -0700 Subject: [PATCH] Merge from gnulib This incorporates: 2015-04-24 file-has-acl: new module, split from acl 2015-04-24 manywarnings: add GCC 5.1 warnings 2015-04-21 lstat: fix cross-compilation 'ln -s' problem 2015-04-15 qacl: Simplify HP-UX acl_nontrivial check 2015-04-15 acl: On Linux, check for acls without libacl 2015-04-14 tempname: avoid unused parameter warnings (trivial) * lib/acl-internal.c: New file, from gnulib. * lib/file-has-acl.c: Remove; no longer imported from gnulib. * lib/acl-internal.h, lib/gnulib.mk, lib/qcopy-acl.c, lib/tempname.c: * m4/acl.m4, m4/gnulib-comp.m4, m4/lstat.m4, m4/manywarnings.m4: Update from gnulib. --- lib/{file-has-acl.c => acl-internal.c} | 462 +------------------------ lib/acl-internal.h | 2 +- lib/gnulib.mk | 2 +- lib/qcopy-acl.c | 17 +- lib/tempname.c | 4 +- m4/acl.m4 | 47 ++- m4/gnulib-comp.m4 | 2 +- m4/lstat.m4 | 48 ++- m4/manywarnings.m4 | 23 +- 9 files changed, 95 insertions(+), 512 deletions(-) rename lib/{file-has-acl.c => acl-internal.c} (51%) diff --git a/lib/file-has-acl.c b/lib/acl-internal.c similarity index 51% rename from lib/file-has-acl.c rename to lib/acl-internal.c index 2ef4e8bdefd..d9bd4461ea6 100644 --- a/lib/file-has-acl.c +++ b/lib/acl-internal.c @@ -17,19 +17,12 @@ Written by Paul Eggert, Andreas Grünbacher, and Bruno Haible. */ -/* Without this pragma, gcc 4.7.0 20120126 may suggest that the - file_has_acl function might be candidate for attribute 'const' */ -#if (__GNUC__ == 4 && 6 <= __GNUC_MINOR__) || 4 < __GNUC__ -# pragma GCC diagnostic ignored "-Wsuggest-attribute=const" -#endif - #include #include "acl.h" #include "acl-internal.h" - #if USE_ACL && HAVE_ACL_GET_FILE # if HAVE_ACL_TYPE_EXTENDED /* Mac OS X */ @@ -124,7 +117,6 @@ acl_access_nontrivial (acl_t acl) # endif - #elif USE_ACL && HAVE_FACL && defined GETACL /* Solaris, Cygwin, not HP-UX */ /* Test an ACL retrieved with GETACL. @@ -344,18 +336,19 @@ acl_ace_nontrivial (int count, ace_t *entries) /* Return 1 if the given ACL is non-trivial. Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ int -acl_nontrivial (int count, struct acl_entry *entries, struct stat *sb) +acl_nontrivial (int count, struct acl_entry *entries) { int i; + if (count > 3) + return 1; + for (i = 0; i < count; i++) { struct acl_entry *ace = &entries[i]; - if (!((ace->uid == sb->st_uid && ace->gid == ACL_NSGROUP) - || (ace->uid == ACL_NSUSER && ace->gid == sb->st_gid) - || (ace->uid == ACL_NSUSER && ace->gid == ACL_NSGROUP))) - return 1; + if (ace->uid != ACL_NSUSER && ace->gid != ACL_NSGROUP) + return 1; } return 0; } @@ -474,446 +467,3 @@ acl_nontrivial (int count, struct acl *entries) } #endif - - -/* Return 1 if NAME has a nontrivial access control list, 0 if NAME - only has no or a base access control list, and -1 (setting errno) - on error. SB must be set to the stat buffer of NAME, obtained - through stat() or lstat(). */ - -int -file_has_acl (char const *name, struct stat const *sb) -{ -#if USE_ACL - if (! S_ISLNK (sb->st_mode)) - { -# if HAVE_ACL_GET_FILE - - /* POSIX 1003.1e (draft 17 -- abandoned) specific version. */ - /* Linux, FreeBSD, Mac OS X, IRIX, Tru64 */ - int ret; - - if (HAVE_ACL_EXTENDED_FILE) /* Linux */ - { - /* On Linux, acl_extended_file is an optimized function: It only - makes two calls to getxattr(), one for ACL_TYPE_ACCESS, one for - ACL_TYPE_DEFAULT. */ - ret = acl_extended_file (name); - } - else /* FreeBSD, Mac OS X, IRIX, Tru64 */ - { -# if HAVE_ACL_TYPE_EXTENDED /* Mac OS X */ - /* On Mac OS X, acl_get_file (name, ACL_TYPE_ACCESS) - and acl_get_file (name, ACL_TYPE_DEFAULT) - always return NULL / EINVAL. There is no point in making - these two useless calls. The real ACL is retrieved through - acl_get_file (name, ACL_TYPE_EXTENDED). */ - acl_t acl = acl_get_file (name, ACL_TYPE_EXTENDED); - if (acl) - { - ret = acl_extended_nontrivial (acl); - acl_free (acl); - } - else - ret = -1; -# else /* FreeBSD, IRIX, Tru64 */ - acl_t acl = acl_get_file (name, ACL_TYPE_ACCESS); - if (acl) - { - int saved_errno; - - ret = acl_access_nontrivial (acl); - saved_errno = errno; - acl_free (acl); - errno = saved_errno; -# if HAVE_ACL_FREE_TEXT /* Tru64 */ - /* On OSF/1, acl_get_file (name, ACL_TYPE_DEFAULT) always - returns NULL with errno not set. There is no point in - making this call. */ -# else /* FreeBSD, IRIX */ - /* On Linux, FreeBSD, IRIX, acl_get_file (name, ACL_TYPE_ACCESS) - and acl_get_file (name, ACL_TYPE_DEFAULT) on a directory - either both succeed or both fail; it depends on the - file system. Therefore there is no point in making the second - call if the first one already failed. */ - if (ret == 0 && S_ISDIR (sb->st_mode)) - { - acl = acl_get_file (name, ACL_TYPE_DEFAULT); - if (acl) - { - ret = (0 < acl_entries (acl)); - acl_free (acl); - } - else - ret = -1; - } -# endif - } - else - ret = -1; -# endif - } - if (ret < 0) - return - acl_errno_valid (errno); - return ret; - -# elif HAVE_FACL && defined GETACL /* Solaris, Cygwin, not HP-UX */ - -# if defined ACL_NO_TRIVIAL - - /* Solaris 10 (newer version), which has additional API declared in - (acl_t) and implemented in libsec (acl_set, acl_trivial, - acl_fromtext, ...). */ - return acl_trivial (name); - -# else /* Solaris, Cygwin, general case */ - - /* Solaris 2.5 through Solaris 10, Cygwin, and contemporaneous versions - of Unixware. The acl() call returns the access and default ACL both - at once. */ - { - /* Initially, try to read the entries into a stack-allocated buffer. - Use malloc if it does not fit. */ - enum - { - alloc_init = 4000 / sizeof (aclent_t), /* >= 3 */ - alloc_max = MIN (INT_MAX, SIZE_MAX / sizeof (aclent_t)) - }; - aclent_t buf[alloc_init]; - size_t alloc = alloc_init; - aclent_t *entries = buf; - aclent_t *malloced = NULL; - int count; - - for (;;) - { - count = acl (name, GETACL, alloc, entries); - if (count < 0 && errno == ENOSPC) - { - /* Increase the size of the buffer. */ - free (malloced); - if (alloc > alloc_max / 2) - { - errno = ENOMEM; - return -1; - } - alloc = 2 * alloc; /* <= alloc_max */ - entries = malloced = - (aclent_t *) malloc (alloc * sizeof (aclent_t)); - if (entries == NULL) - { - errno = ENOMEM; - return -1; - } - continue; - } - break; - } - if (count < 0) - { - if (errno == ENOSYS || errno == ENOTSUP) - ; - else - { - int saved_errno = errno; - free (malloced); - errno = saved_errno; - return -1; - } - } - else if (count == 0) - ; - else - { - /* Don't use MIN_ACL_ENTRIES: It's set to 4 on Cygwin, but Cygwin - returns only 3 entries for files with no ACL. But this is safe: - If there are more than 4 entries, there cannot be only the - "user::", "group::", "other:", and "mask:" entries. */ - if (count > 4) - { - free (malloced); - return 1; - } - - if (acl_nontrivial (count, entries)) - { - free (malloced); - return 1; - } - } - free (malloced); - } - -# ifdef ACE_GETACL - /* Solaris also has a different variant of ACLs, used in ZFS and NFSv4 - file systems (whereas the other ones are used in UFS file systems). */ - { - /* Initially, try to read the entries into a stack-allocated buffer. - Use malloc if it does not fit. */ - enum - { - alloc_init = 4000 / sizeof (ace_t), /* >= 3 */ - alloc_max = MIN (INT_MAX, SIZE_MAX / sizeof (ace_t)) - }; - ace_t buf[alloc_init]; - size_t alloc = alloc_init; - ace_t *entries = buf; - ace_t *malloced = NULL; - int count; - - for (;;) - { - count = acl (name, ACE_GETACL, alloc, entries); - if (count < 0 && errno == ENOSPC) - { - /* Increase the size of the buffer. */ - free (malloced); - if (alloc > alloc_max / 2) - { - errno = ENOMEM; - return -1; - } - alloc = 2 * alloc; /* <= alloc_max */ - entries = malloced = (ace_t *) malloc (alloc * sizeof (ace_t)); - if (entries == NULL) - { - errno = ENOMEM; - return -1; - } - continue; - } - break; - } - if (count < 0) - { - if (errno == ENOSYS || errno == EINVAL) - ; - else - { - int saved_errno = errno; - free (malloced); - errno = saved_errno; - return -1; - } - } - else if (count == 0) - ; - else - { - /* In the old (original Solaris 10) convention: - If there are more than 3 entries, there cannot be only the - ACE_OWNER, ACE_GROUP, ACE_OTHER entries. - In the newer Solaris 10 and Solaris 11 convention: - If there are more than 6 entries, there cannot be only the - ACE_OWNER, ACE_GROUP, ACE_EVERYONE entries, each once with - NEW_ACE_ACCESS_ALLOWED_ACE_TYPE and once with - NEW_ACE_ACCESS_DENIED_ACE_TYPE. */ - if (count > 6) - { - free (malloced); - return 1; - } - - if (acl_ace_nontrivial (count, entries)) - { - free (malloced); - return 1; - } - } - free (malloced); - } -# endif - - return 0; -# endif - -# elif HAVE_GETACL /* HP-UX */ - - { - struct acl_entry entries[NACLENTRIES]; - int count; - - count = getacl (name, NACLENTRIES, entries); - - if (count < 0) - { - /* ENOSYS is seen on newer HP-UX versions. - EOPNOTSUPP is typically seen on NFS mounts. - ENOTSUP was seen on Quantum StorNext file systems (cvfs). */ - if (errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTSUP) - ; - else - return -1; - } - else if (count == 0) - return 0; - else /* count > 0 */ - { - if (count > NACLENTRIES) - /* If NACLENTRIES cannot be trusted, use dynamic memory - allocation. */ - abort (); - - /* If there are more than 3 entries, there cannot be only the - (uid,%), (%,gid), (%,%) entries. */ - if (count > 3) - return 1; - - { - struct stat statbuf; - - if (stat (name, &statbuf) < 0) - return -1; - - return acl_nontrivial (count, entries, &statbuf); - } - } - } - -# if HAVE_ACLV_H /* HP-UX >= 11.11 */ - - { - struct acl entries[NACLVENTRIES]; - int count; - - count = acl ((char *) name, ACL_GET, NACLVENTRIES, entries); - - if (count < 0) - { - /* EOPNOTSUPP is seen on NFS in HP-UX 11.11, 11.23. - EINVAL is seen on NFS in HP-UX 11.31. */ - if (errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL) - ; - else - return -1; - } - else if (count == 0) - return 0; - else /* count > 0 */ - { - if (count > NACLVENTRIES) - /* If NACLVENTRIES cannot be trusted, use dynamic memory - allocation. */ - abort (); - - /* If there are more than 4 entries, there cannot be only the - four base ACL entries. */ - if (count > 4) - return 1; - - return aclv_nontrivial (count, entries); - } - } - -# endif - -# elif HAVE_ACLX_GET && defined ACL_AIX_WIP /* AIX */ - - acl_type_t type; - char aclbuf[1024]; - void *acl = aclbuf; - size_t aclsize = sizeof (aclbuf); - mode_t mode; - - for (;;) - { - /* The docs say that type being 0 is equivalent to ACL_ANY, but it - is not true, in AIX 5.3. */ - type.u64 = ACL_ANY; - if (aclx_get (name, 0, &type, aclbuf, &aclsize, &mode) >= 0) - break; - if (errno == ENOSYS) - return 0; - if (errno != ENOSPC) - { - if (acl != aclbuf) - { - int saved_errno = errno; - free (acl); - errno = saved_errno; - } - return -1; - } - aclsize = 2 * aclsize; - if (acl != aclbuf) - free (acl); - acl = malloc (aclsize); - if (acl == NULL) - { - errno = ENOMEM; - return -1; - } - } - - if (type.u64 == ACL_AIXC) - { - int result = acl_nontrivial ((struct acl *) acl); - if (acl != aclbuf) - free (acl); - return result; - } - else if (type.u64 == ACL_NFS4) - { - int result = acl_nfs4_nontrivial ((nfs4_acl_int_t *) acl); - if (acl != aclbuf) - free (acl); - return result; - } - else - { - /* A newer type of ACL has been introduced in the system. - We should better support it. */ - if (acl != aclbuf) - free (acl); - errno = EINVAL; - return -1; - } - -# elif HAVE_STATACL /* older AIX */ - - union { struct acl a; char room[4096]; } u; - - if (statacl (name, STX_NORMAL, &u.a, sizeof (u)) < 0) - return -1; - - return acl_nontrivial (&u.a); - -# elif HAVE_ACLSORT /* NonStop Kernel */ - - { - struct acl entries[NACLENTRIES]; - int count; - - count = acl ((char *) name, ACL_GET, NACLENTRIES, entries); - - if (count < 0) - { - if (errno == ENOSYS || errno == ENOTSUP) - ; - else - return -1; - } - else if (count == 0) - return 0; - else /* count > 0 */ - { - if (count > NACLENTRIES) - /* If NACLENTRIES cannot be trusted, use dynamic memory - allocation. */ - abort (); - - /* If there are more than 4 entries, there cannot be only the - four base ACL entries. */ - if (count > 4) - return 1; - - return acl_nontrivial (count, entries); - } - } - -# endif - } -#endif - - return 0; -} diff --git a/lib/acl-internal.h b/lib/acl-internal.h index 243ca32b822..9b9fae2e9e0 100644 --- a/lib/acl-internal.h +++ b/lib/acl-internal.h @@ -220,7 +220,7 @@ extern int acl_ace_nontrivial (int count, ace_t *entries) _GL_ATTRIBUTE_PURE; /* Return 1 if the given ACL is non-trivial. Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ -extern int acl_nontrivial (int count, struct acl_entry *entries, struct stat *sb); +extern int acl_nontrivial (int count, struct acl_entry *entries); # if HAVE_ACLV_H /* HP-UX >= 11.11 */ diff --git a/lib/gnulib.mk b/lib/gnulib.mk index 273b018bdb8..bec0d3bb19b 100644 --- a/lib/gnulib.mk +++ b/lib/gnulib.mk @@ -698,7 +698,7 @@ EXTRA_libgnu_a_SOURCES += putenv.c ## begin gnulib module qacl -libgnu_a_SOURCES += acl-errno-valid.c file-has-acl.c qcopy-acl.c qset-acl.c +libgnu_a_SOURCES += acl-errno-valid.c acl-internal.c qcopy-acl.c qset-acl.c EXTRA_DIST += acl-internal.h acl.h acl_entries.c diff --git a/lib/qcopy-acl.c b/lib/qcopy-acl.c index aac76a12432..bc258ba560b 100644 --- a/lib/qcopy-acl.c +++ b/lib/qcopy-acl.c @@ -437,20 +437,9 @@ qcopy_acl (const char *src_name, int source_desc, const char *dst_name, if (ret < 0 && saved_errno == 0) { saved_errno = errno; - if (errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTSUP) - { - struct stat source_statbuf; - - if ((source_desc != -1 - ? fstat (source_desc, &source_statbuf) - : stat (src_name, &source_statbuf)) == 0) - { - if (!acl_nontrivial (count, entries, &source_statbuf)) - saved_errno = 0; - } - else - saved_errno = errno; - } + if (errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTSUP + && !acl_nontrivial (count, entries)) + saved_errno = 0; } else did_chmod = 1; diff --git a/lib/tempname.c b/lib/tempname.c index 8e6d26cc485..69c572fbcb4 100644 --- a/lib/tempname.c +++ b/lib/tempname.c @@ -269,13 +269,13 @@ try_file (char *tmpl, void *flags) } static int -try_dir (char *tmpl, void *flags) +try_dir (char *tmpl, void *flags _GL_UNUSED) { return __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR); } static int -try_nocreate (char *tmpl, void *flags) +try_nocreate (char *tmpl, void *flags _GL_UNUSED) { struct_stat64 st; diff --git a/m4/acl.m4 b/m4/acl.m4 index c77f0edd0e7..186353c395b 100644 --- a/m4/acl.m4 +++ b/m4/acl.m4 @@ -1,5 +1,5 @@ # acl.m4 - check for access control list (ACL) primitives -# serial 17 +# serial 18 # Copyright (C) 2002, 2004-2015 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation @@ -8,23 +8,29 @@ # Written by Paul Eggert and Jim Meyering. -AC_DEFUN([gl_FUNC_ACL], +AC_DEFUN([gl_FUNC_ACL_ARG], [ + gl_need_lib_has_acl= AC_ARG_ENABLE([acl], AS_HELP_STRING([--disable-acl], [do not support ACLs]), , [enable_acl=auto]) +]) + +AC_DEFUN([gl_FUNC_ACL], +[ + AC_REQUIRE([gl_FUNC_ACL_ARG]) AC_CHECK_FUNCS_ONCE([fchmod]) LIB_ACL= use_acl=0 - if test "x$enable_acl" != "xno"; then + if test "$enable_acl" != no; then dnl On all platforms, the ACL related API is declared in . AC_CHECK_HEADERS([sys/acl.h]) if test $ac_cv_header_sys_acl_h = yes; then ac_save_LIBS=$LIBS - dnl Test for POSIX-draft-like API (Linux, FreeBSD, Mac OS X, IRIX, Tru64). - dnl -lacl is needed on Linux, -lpacl is needed on OSF/1. + dnl Test for POSIX-draft-like API (GNU/Linux, FreeBSD, Mac OS X, + dnl IRIX, Tru64). -lacl is needed on GNU/Linux, -lpacl on OSF/1. if test $use_acl = 0; then AC_SEARCH_LIBS([acl_get_file], [acl pacl], [if test "$ac_cv_search_acl_get_file" != "none required"; then @@ -40,7 +46,7 @@ AC_DEFUN([gl_FUNC_ACL], # If the acl_get_file bug is detected, don't enable the ACL support. gl_ACL_GET_FILE([use_acl=1], []) if test $use_acl = 1; then - dnl On Linux, additional API is declared in . + dnl On GNU/Linux, an additional API is declared in . AC_CHECK_HEADERS([acl/libacl.h]) AC_REPLACE_FUNCS([acl_entries]) AC_CACHE_CHECK([for ACL_FIRST_ENTRY], @@ -124,13 +130,15 @@ int type = ACL_TYPE_EXTENDED;]])], LIBS=$ac_save_LIBS fi - if test "x$enable_acl$use_acl" = "xyes0"; then + + if test "$enable_acl$use_acl" = yes0; then AC_MSG_ERROR([ACLs enabled but support not detected]) - elif test "x$enable_acl$use_acl" = "xauto0"; then + elif test "$enable_acl$use_acl" = auto0; then AC_MSG_WARN([libacl development library was not found or not usable.]) AC_MSG_WARN([AC_PACKAGE_NAME will be built without ACL support.]) fi fi + test $gl_need_lib_has_acl && LIB_HAS_ACL=$LIB_ACL AC_SUBST([LIB_ACL]) AC_DEFINE_UNQUOTED([USE_ACL], [$use_acl], [Define to nonzero if you want access control list support.]) @@ -139,7 +147,7 @@ int type = ACL_TYPE_EXTENDED;]])], ]) # gl_ACL_GET_FILE(IF-WORKS, IF-NOT) -# ------------------------------------- +# --------------------------------- # If 'acl_get_file' works (does not have a particular bug), # run IF-WORKS, otherwise, IF-NOT. # When building natively, test for a Darwin 8.7.0 bug, whereby acl_get_file @@ -166,3 +174,24 @@ AC_DEFUN([gl_ACL_GET_FILE], fi])]) AS_IF([test "$gl_cv_func_working_acl_get_file" != no], [$1], [$2]) ]) + +# On GNU/Linux, testing if a file has an acl can be done with the getxattr +# syscall which doesn't require linking against additional libraries. +AC_DEFUN([gl_FILE_HAS_ACL], +[ + AC_REQUIRE([gl_FUNC_ACL_ARG]) + if test "$enable_acl" != no; then + AC_CHECK_HEADERS([linux/xattr.h], + [AC_CHECK_HEADERS([sys/xattr.h], + [AC_CHECK_FUNCS([getxattr])])]) + fi + if test "$ac_cv_header_sys_xattr_h,$ac_cv_header_linux_xattr_h,$ac_cv_func_getxattr" = yes,yes,yes; then + LIB_HAS_ACL= + else + dnl Set gl_need_lib_has_acl to a nonempty value, so that any + dnl later gl_FUNC_ACL call will set LIB_HAS_ACL=$LIB_ACL. + gl_need_lib_has_acl=1 + LIB_HAS_ACL=$LIB_ACL + fi + AC_SUBST([LIB_HAS_ACL]) +]) diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4 index f32a4ddca5c..06636cfe76c 100644 --- a/m4/gnulib-comp.m4 +++ b/m4/gnulib-comp.m4 @@ -818,6 +818,7 @@ AC_DEFUN([gl_FILE_LIST], [ build-aux/snippet/warn-on-use.h build-aux/update-copyright lib/acl-errno-valid.c + lib/acl-internal.c lib/acl-internal.h lib/acl.h lib/acl_entries.c @@ -856,7 +857,6 @@ AC_DEFUN([gl_FILE_LIST], [ lib/fcntl.in.h lib/fdatasync.c lib/fdopendir.c - lib/file-has-acl.c lib/filemode.c lib/filemode.h lib/fpending.c diff --git a/m4/lstat.m4 b/m4/lstat.m4 index f6c7dd1ce44..adf752c0dfa 100644 --- a/m4/lstat.m4 +++ b/m4/lstat.m4 @@ -1,4 +1,4 @@ -# serial 26 +# serial 27 # Copyright (C) 1997-2001, 2003-2015 Free Software Foundation, Inc. # @@ -37,30 +37,28 @@ AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK], [gl_cv_func_lstat_dereferences_slashed_symlink], [rm -f conftest.sym conftest.file echo >conftest.file - if test "$as_ln_s" = "ln -s" && ln -s conftest.file conftest.sym; then - AC_RUN_IFELSE( - [AC_LANG_PROGRAM( - [AC_INCLUDES_DEFAULT], - [[struct stat sbuf; - /* Linux will dereference the symlink and fail, as required by - POSIX. That is better in the sense that it means we will not - have to compile and use the lstat wrapper. */ - return lstat ("conftest.sym/", &sbuf) == 0; - ]])], - [gl_cv_func_lstat_dereferences_slashed_symlink=yes], - [gl_cv_func_lstat_dereferences_slashed_symlink=no], - [case "$host_os" in - # Guess yes on glibc systems. - *-gnu*) gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; - # If we don't know, assume the worst. - *) gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;; - esac - ]) - else - # If the 'ln -s' command failed, then we probably don't even - # have an lstat function. - gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" - fi + AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [AC_INCLUDES_DEFAULT], + [[struct stat sbuf; + if (symlink ("conftest.file", "conftest.sym") != 0) + return 1; + /* Linux will dereference the symlink and fail, as required by + POSIX. That is better in the sense that it means we will not + have to compile and use the lstat wrapper. */ + return lstat ("conftest.sym/", &sbuf) == 0; + ]])], + [gl_cv_func_lstat_dereferences_slashed_symlink=yes], + [gl_cv_func_lstat_dereferences_slashed_symlink=no], + [case "$host_os" in + *-gnu*) + # Guess yes on glibc systems. + gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; + *) + # If we don't know, assume the worst. + gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;; + esac + ]) rm -f conftest.sym conftest.file ]) case "$gl_cv_func_lstat_dereferences_slashed_symlink" in diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4 index 44da98e38da..b4e38d94463 100644 --- a/m4/manywarnings.m4 +++ b/m4/manywarnings.m4 @@ -108,12 +108,13 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC], -Waddress \ -Waggressive-loop-optimizations \ -Wall \ - -Warray-bounds \ -Wattributes \ -Wbad-function-cast \ + -Wbool-compare \ -Wbuiltin-macro-redefined \ -Wcast-align \ -Wchar-subscripts \ + -Wchkp \ -Wclobbered \ -Wcomment \ -Wcomments \ @@ -122,7 +123,10 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC], -Wdate-time \ -Wdeprecated \ -Wdeprecated-declarations \ + -Wdesignated-init \ -Wdisabled-optimization \ + -Wdiscarded-array-qualifiers \ + -Wdiscarded-qualifiers \ -Wdiv-by-zero \ -Wdouble-promotion \ -Wempty-body \ @@ -133,6 +137,7 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC], -Wformat-extra-args \ -Wformat-nonliteral \ -Wformat-security \ + -Wformat-signedness \ -Wformat-y2k \ -Wformat-zero-length \ -Wfree-nonheap-object \ @@ -140,15 +145,19 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC], -Wimplicit \ -Wimplicit-function-declaration \ -Wimplicit-int \ + -Wincompatible-pointer-types \ -Winit-self \ -Winline \ + -Wint-conversion \ -Wint-to-pointer-cast \ -Winvalid-memory-model \ -Winvalid-pch \ -Wjump-misses-init \ + -Wlogical-not-parentheses \ -Wlogical-op \ -Wmain \ -Wmaybe-uninitialized \ + -Wmemset-transposed-args \ -Wmissing-braces \ -Wmissing-declarations \ -Wmissing-field-initializers \ @@ -159,6 +168,7 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC], -Wnarrowing \ -Wnested-externs \ -Wnonnull \ + -Wodr \ -Wold-style-declaration \ -Wold-style-definition \ -Wopenmp-simd \ @@ -176,6 +186,9 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC], -Wreturn-type \ -Wsequence-point \ -Wshadow \ + -Wshift-count-negative \ + -Wshift-count-overflow \ + -Wsizeof-array-argument \ -Wsizeof-pointer-memaccess \ -Wstack-protector \ -Wstrict-aliasing \ @@ -185,7 +198,10 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC], -Wsuggest-attribute=format \ -Wsuggest-attribute=noreturn \ -Wsuggest-attribute=pure \ + -Wsuggest-final-methods \ + -Wsuggest-final-types \ -Wswitch \ + -Wswitch-bool \ -Wswitch-default \ -Wsync-nand \ -Wsystem-headers \ @@ -217,8 +233,9 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC], gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item" done - # gcc --help=warnings outputs an unusual form for this option; list - # it here so that the above 'comm' command doesn't report a false match. + # gcc --help=warnings outputs an unusual form for these options; list + # them here so that the above 'comm' command doesn't report a false match. + gl_manywarn_set="$gl_manywarn_set -Warray-bounds=2" gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc" # These are needed for older GCC versions. -- 2.39.2