[SCM] GNU M4 source repository branch, branch-1.4, updated. v1.4.16-36-g197bca5

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 197bca5d979eab30a82bf42f6c2b856b84e8efb2
Author: Eric Blake <address@hidden>
Date:   Tue Mar 12 17:23:30 2013 -0600

    build: avoid test failure on HPUX
    
    POSIX permits implementations to open fd 0, 1, and 2 on exec(), even
    when the user tried to close them.  HPUX-11.23 is one of the
    implementations that does not allow closed standard descriptors,
    leading to a failure of test 005.command_li.  But a test that makes
    sure we behave gracefully in the face of closed standard descriptors
    makes no sense on a platform where we can never have them closed, so
    add some code to skip the test on "helpful" platforms.
    
    Note - HPUX opens any closed standard descriptor as O_WRONLY on
    /dev/null.  This means that attempts to close stdout generally
    result in silent success, but attempts to close stdin often still
    result in failure when it is not possible to read from the O_WRONLY
    stdin.
    
    * doc/m4.texi (Command line files): Skip tests on systems where it
    is impossible to start with stdin/out closed.
    Reported by Gary V. Vaughan.
    
    Signed-off-by: Eric Blake <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog   |    7 +++++++
 doc/m4.texi |    6 ++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 8798406..1233d2e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2013-03-15  Eric Blake  <address@hidden>
+
+       build: avoid test failure on HPUX
+       * doc/m4.texi (Command line files): Skip tests on systems where it
+       is impossible to start with stdin/out closed.
+       Reported by Gary V. Vaughan.
+
 2013-03-12  Eric Blake  <address@hidden>
 
        maint: update to latest gnulib
diff --git a/doc/m4.texi b/doc/m4.texi
index b8b1704..5cca8c4 100644
--- a/doc/m4.texi
+++ b/doc/m4.texi
@@ -993,6 +993,9 @@ options.
 ifdef(`__unix__', ,
       `errprint(` skipping: syscmd does not have unix semantics
 ')m4exit(`77')')dnl
+syscmd(`echo | cat >&- 2>/dev/null')ifelse(sysval, `0',
+       `errprint(` skipping: system does not allow closing stdout
+')m4exit(`77')')dnl
 changequote(`[', `]')dnl
 syscmd([echo | ']__program__[' >&-])dnl
 @error{}m4: write error: Bad file descriptor
@@ -1004,6 +1007,9 @@ sysval
 ifdef(`__unix__', ,
       `errprint(` skipping: syscmd does not have unix semantics
 ')m4exit(`77')')dnl
+syscmd(`echo | cat >&- 2>/dev/null')ifelse(sysval, `0',
+       `errprint(` skipping: system does not allow closing stdout
+')m4exit(`77')')dnl
 changequote(`[', `]')dnl
 syscmd([echo 'esyscmd(echo hi >&2 && echo err"print(bye
 )d"nl)dnl' > tmp.m4 \


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