Mercurial > hg > octave-lyh > gnulib-hg
changeset 14272:1af1ed4871ed
unsetenv: work around Haiku issues
On Haiku alpha 2, test-unsetenv.c passed in isolation with just
system headers, but failed when libgnu and replacement headers
were in use. Why? Because putenv("a") fails to remove "a=..."
from the environment, but the gnulib rpl_putenv works by
assigning to environ. Apparently, Haiku is doing some funky
caching issues, and correctly removes all vestiges of environment
duplicates when Haiku is in charge, but not after assigning to
environ forces Haiku to rebuild its cache.
The m4 change is sufficient to detect Haiku's oddities, and the
existing replacement then passes just fine.
* m4/setenv.m4 (gl_FUNC_UNSETENV): Also detect Haiku issue.
* doc/posix-functions/unsetenv.texi (unsetenv): Document it.
Signed-off-by: Eric Blake <eblake@redhat.com>
| author | Eric Blake <eblake@redhat.com> |
|---|---|
| date | Sat, 05 Feb 2011 14:31:59 -0700 |
| parents | b4cc3c41ca79 |
| children | 8f6d3e05c7e2 |
| files | ChangeLog doc/posix-functions/unsetenv.texi m4/setenv.m4 |
| diffstat | 3 files changed, 19 insertions(+), 5 deletions(-) [+] |
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--- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,9 @@ 2011-02-05 Eric Blake <eblake@redhat.com> + unsetenv: work around Haiku issues + * m4/setenv.m4 (gl_FUNC_UNSETENV): Also detect Haiku issue. + * doc/posix-functions/unsetenv.texi (unsetenv): Document it. + strerror_r-posix: port to cygwin * lib/strerror_r.c (strerror_r) [__CYGWIN__]: Add cygwin implementation.
--- a/doc/posix-functions/unsetenv.texi +++ b/doc/posix-functions/unsetenv.texi @@ -25,7 +25,7 @@ @item This function removes only the first value association for the given environment variable, not all of them, on some platforms: -Solaris 11 2010-11. +Solaris 11 2010-11, Haiku. @end itemize Portability problems not fixed by Gnulib:
--- a/m4/setenv.m4 +++ b/m4/setenv.m4 @@ -1,4 +1,4 @@ -# setenv.m4 serial 20 +# setenv.m4 serial 21 dnl Copyright (C) 2001-2004, 2006-2011 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -97,20 +97,30 @@ fi dnl Solaris 10 unsetenv does not remove all copies of a name. + dnl Haiku alpha 2 unsetenv gets confused by assignment to environ. dnl OpenBSD 4.7 unsetenv("") does not fail. AC_CACHE_CHECK([whether unsetenv obeys POSIX], [gl_cv_func_unsetenv_works], [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #include <stdlib.h> #include <errno.h> + extern char **environ; ]], [[ - char entry[] = "b=2"; + char entry1[] = "a=1"; + char entry2[] = "b=2"; + char *env[] = { entry1, entry2, NULL }; if (putenv ((char *) "a=1")) return 1; - if (putenv (entry)) return 2; - entry[0] = 'a'; + if (putenv (entry2)) return 2; + entry2[0] = 'a'; unsetenv ("a"); if (getenv ("a")) return 3; if (!unsetenv ("") || errno != EINVAL) return 4; + entry2[0] = 'b'; + environ = env; + if (!getenv ("a")) return 5; + entry2[0] = 'a'; + unsetenv ("a"); + if (getenv ("a")) return 6; ]])], [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no], [gl_cv_func_unsetenv_works="guessing no"])])