Re: link and run a (fortran) program redirecting its stdout/stderr

[Eric Blake]

According to Paolo Bonzini on 10/30/2009 1:36 PM:
> On 10/30/2009 01:00 PM, Eric Blake wrote:
>> According to Ralf Wildenhues on 10/30/2009 12:31 AM:
>>> Should we also document that the ACTION-IF-TRUE part of
>>> AC_LINK_IFELSE allows linked programs to be inspected (not necessarily
>>> run) and that of AC_COMPILE_IFELSE allows compiled objects to be
>>> inspected?
>>
>> Hmm, those aren't done as often (about all you can do is run nm on it;
>> that seems like something libtool might want to do, but who else does it
>> to be worth documenting it?).
> 
> For AC_LINK_IFELSE you could run the program if not cross-compiling.
> That seems better than the AC_TRY_RUN(ac_link) that is usually done.

Clearing out some more documentation todo's from my inbox.  This is now on
my push queue.

-- 
Eric Blake   ebl...@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

From 53b94981d6e777d65ddb7b5830301e34c35e760b Mon Sep 17 00:00:00 2001
From: Eric Blake <ebl...@redhat.com>
Date: Tue, 2 Mar 2010 14:00:24 -0700
Subject: [PATCH] Improve documentation on AC_{COMPILE,LINK}_IFELSE.

* doc/autoconf.texi (Running the Compiler): Mention that the
object file is available after a successful compile.
(Running the Linker): Likewise for the linker output.
Suggested by Paolo Bonzini.

Signed-off-by: Eric Blake <ebl...@redhat.com>
---
 ChangeLog         |    6 ++++++
 doc/autoconf.texi |    6 ++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index e6bbd4e..4eae96d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2010-03-02  Eric Blake  <ebl...@redhat.com>

+       Improve documentation on AC_{COMPILE,LINK}_IFELSE.
+       * doc/autoconf.texi (Running the Compiler): Mention that the
+       object file is available after a successful compile.
+       (Running the Linker): Likewise for the linker output.
+       Suggested by Paolo Bonzini.
+
        Fix typo in docs.
        * doc/autoconf.texi (Conditional constructs) <m4_ifblank>: Fix
        typo.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index e302e1a..c4f96c8 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -8914,7 +8914,8 @@ Running the Compiler
 It is customary to report unexpected failures with
 @code{AC_MSG_FAILURE}.  This macro does not try to link; use
 @code{AC_LINK_IFELSE} if you need to do that (@pxref{Running the
-Linker}).
+Linker}).  If needed, @var{action-if-true} can further access the
+just-linked object file @file{conftest.$ac_object}.

 This macro uses @code{AC_REQUIRE} for the compiler associated with the
 current language, which means that if the compiler has not yet been
@@ -8959,7 +8960,8 @@ Running the Linker
 language (@pxref{Language Choice}) on the @var{input}, run the shell
 commands @var{action-if-true} on success, @var{action-if-false}
 otherwise.  The @var{input} can be made by @code{AC_LANG_PROGRAM} and
-friends.
+friends.  If needed, @var{action-if-true} can further access the
+just-linked program file @file{conftest$ac_exeext}.

 @code{LDFLAGS} and @code{LIBS} are used for linking, in addition to the
 current compilation flags.
-- 
1.6.6.1

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