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using --tag=XXX in automake-generated rules (Was: Re: 'ccache gcc'as compiler with libtool)
- From: Alexandre Duret-Lutz <adl at src dot lip6 dot fr>
- To: "Gary V. Vaughan" <gary at gnu dot org>
- Cc: libtool at gnu dot org, automake at gnu dot org, Vincent Caron <v dot caron at zerodeux dot net>
- Date: Fri, 02 Jan 2004 19:41:18 +0100
- Subject: using --tag=XXX in automake-generated rules (Was: Re: 'ccache gcc'as compiler with libtool)
- References: <Pine.GSO.4.44.0311260857090.22691-100000@scooby.simplesystems.org><2003-11-27-21-01-01+11323+duret_g@lrde.epita.fr><3FC7192B.1000802@gnu.org> <w4fwu9k3jbv.fsf@src.lip6.fr><3FC71F6C.3000402@gnu.org>
>>> "Gary" == Gary V Vaughan <gary@gnu.org> writes:
[...about Automake passing --tag=XXX to libtool...]
Gary> Alexandre Duret-Lutz wrote:
>> >> How can automake determine whether the version of libtool used in
>> >> a package supports --tag ?
[...]
Gary> _LT_AC_TAGCONFIG exists in branch-1-5 and HEAD.
Not quite. branch-1-5 has _LT_AC_TAGCONFIG but HEAD has _LT_AC_TAG_CONFIG.
I prefer to rely on AC_LIBTOOL_TAGS, because this macro supplies
a list of supported tags (either the tags supplied by the users,
or the default list of tags). Is this OK with you?
Below is the implementation I propose, it traces both
_LT_AC_TAG_CONFIG for Libtool 1.5 and AC_LIBTOOL_TAGS for newer
versions.
BTW currently the --tag option and the AC_LIBTOOL_TAGS macro are
not documented in the Libtool manual.
2004-01-02 Alexandre Duret-Lutz <adl@gnu.org>
Fix for PR automake/289:
* automake.in (Automake::Struct::libtool_tag): New attribute. Define
it for the language that have a Libtool tag.
(%libtool_tags): New variable.
(handle_languages, define_compiler_variable)
(define_linker_variable): Pass --tag=XXX to libtool if supported.
(scan_autoconf_traces): Scan for _LT_AC_TAGCONFIG and AC_LIBTOOL_TAGS.
* tests/libtool3.test, tests/subobj9.test: Check that --tag=XXX are
output.
Index: NEWS
===================================================================
RCS file: /cvs/automake/automake/NEWS,v
retrieving revision 1.260
diff -u -r1.260 NEWS
--- NEWS 1 Jan 2004 18:54:20 -0000 1.260
+++ NEWS 2 Jan 2004 18:37:17 -0000
@@ -1,5 +1,8 @@
New in 1.8a:
+* Libtool tags are used with libtool versions that support it.
+ (I.e., with Libtool 1.5 or greater.)
+
* Makefile.in bloat reduction.
- Inference rules are used to compile sources in subdirectories when
Index: automake.in
===================================================================
RCS file: /cvs/automake/automake/automake.in,v
retrieving revision 1.1533
diff -u -r1.1533 automake.in
--- automake.in 1 Jan 2004 21:57:23 -0000 1.1533
+++ automake.in 2 Jan 2004 18:37:21 -0000
@@ -76,6 +76,9 @@
# (defaults to [])
'flags' => "@",
+ # Any tag to pass to libtool while compiling.
+ 'libtool_tag' => "\$",
+
# The file to use when generating rules for this language.
# The default is 'depend2'.
'rule_file' => "\$",
@@ -332,6 +335,9 @@
# Where AM_GNU_GETTEXT appears.
my $ac_gettext_location;
+# Lists of tags supported by Libtool.
+my %libtool_tags = ();
+
# TRUE if we've seen AC_CANONICAL_(HOST|SYSTEM).
my $seen_canonical = 0;
my $canonical_location;
@@ -663,6 +669,7 @@
'linker' => 'LINK',
'link' => '$(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@',
'compile_flag' => '-c',
+ 'libtool_tag' => 'CC',
'extensions' => ['.c'],
'_finish' => \&lang_c_finish);
@@ -678,6 +685,7 @@
'compiler' => 'CXXCOMPILE',
'compile_flag' => '-c',
'output_flag' => '-o',
+ 'libtool_tag' => 'CXX',
'lder' => 'CXXLD',
'ld' => '$(CXX)',
'pure' => 1,
@@ -788,6 +796,7 @@
'compiler' => 'F77COMPILE',
'compile_flag' => '-c',
'output_flag' => '-o',
+ 'libtool_tag' => 'F77',
'lder' => 'F77LD',
'ld' => '$(F77)',
'pure' => 1,
@@ -820,6 +829,7 @@
'compile' => '$(F77) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_FFLAGS) $(FFLAGS)',
'compile_flag' => '-c',
'output_flag' => '-o',
+ 'libtool_tag' => 'F77',
'pure' => 1,
'extensions' => ['.F']);
@@ -837,6 +847,7 @@
'compiler' => 'RCOMPILE',
'compile_flag' => '-c',
'output_flag' => '-o',
+ 'libtool_tag' => 'F77',
'pure' => 1,
'extensions' => ['.r']);
@@ -852,6 +863,7 @@
'compiler' => 'GCJCOMPILE',
'compile_flag' => '-c',
'output_flag' => '-o',
+ 'libtool_tag' => 'GCJ',
'lder' => 'GCJLD',
'ld' => '$(GCJ)',
'pure' => 1,
@@ -1148,7 +1160,14 @@
if set_seen ($val);
}
- my $obj_ltcompile = '$(LIBTOOL) --mode=compile ' . $obj_compile;
+ my $libtool_tag = '';
+ if ($lang->libtool_tag && exists $libtool_tags{$lang->libtool_tag})
+ {
+ $libtool_tag = '--tag=' . $lang->libtool_tag . ' '
+ }
+
+ my $obj_ltcompile =
+ '$(LIBTOOL) --mode=compile ' . $libtool_tag . $obj_compile;
# We _need_ `-o' for per object rules.
my $output_flag = $lang->output_flag || '-o';
@@ -4465,6 +4484,9 @@
my ($filename) = @_;
# Macros to trace, with their minimal number of arguments.
+ #
+ # IMPORTANT: If you add a macro here, you should also list this macro
+ # ========= to Automake-preselection in autoconf/lib/autom4te.cfg.
my %traced = (
AC_CANONICAL_HOST => 0,
AC_CANONICAL_SYSTEM => 0,
@@ -4474,6 +4496,7 @@
AC_CONFIG_LINKS => 1,
AC_INIT => 0,
AC_LIBSOURCE => 1,
+ AC_LIBTOOL_TAGS => 1,
AC_SUBST => 1,
AM_AUTOMAKE_VERSION => 1,
AM_CONDITIONAL => 2,
@@ -4485,6 +4508,7 @@
m4_include => 1,
m4_sinclude => 1,
sinclude => 1,
+ _LT_AC_TAGCONFIG => 0,
);
my $traces = ($ENV{AUTOCONF} || 'autoconf') . " ";
@@ -4569,6 +4593,14 @@
{
$libsources{$args[1]} = $here;
}
+ elsif ($macro eq 'AC_LIBTOOL_TAGS')
+ {
+ # Reset %libtool_tags, in case AC_LIBTOOL_TAGS is
+ # expansed after _LT_AC_TAGCONFIG. We want to ignore
+ # _LT_AC_TAGCONFIG if AC_LIBTOOL_TAGS is called.
+ %libtool_tags = (CC => 1);
+ $libtool_tags{$_} = 1 foreach split (' ', $args[1]);
+ }
elsif ($macro eq 'AC_SUBST')
{
# Just check for alphanumeric in AC_SUBST. If you do
@@ -4645,6 +4677,19 @@
if $mtime > $configure_deps_greatest_timestamp;
}
}
+ elsif ($macro eq '_LT_AC_TAGCONFIG')
+ {
+ # _LT_AC_TAGCONFIG is an old macro present in Libtool 1.5.
+ # We use it to detect whether tags are supported. Our prefered
+ # interface is AC_LIBTOOL_TAGS, but it was introduced in
+ # Libtool 1.6. Ignore _LT_AC_TAGCONFIG if AC_LIBTOOL_TAGS has
+ # been called.
+ if (0 == keys %libtool_tags)
+ {
+ # Hardcode the tags supported by Libtool 1.5.
+ %libtool_tags = (CC => 1, CXX => 1, GCJ => 1, F77 => 1);
+ }
+ }
}
$tracefh->close;
@@ -5433,8 +5478,13 @@
my ($lang) = @_;
my ($var, $value) = ($lang->compiler, $lang->compile);
+ my $libtool_tag = '';
+ $libtool_tag = '--tag=' . $lang->libtool_tag . ' '
+ if $lang->libtool_tag && exists $libtool_tags{$lang->libtool_tag};
&define_variable ($var, $value, INTERNAL);
- &define_variable ("LT$var", "\$(LIBTOOL) --mode=compile $value", INTERNAL)
+ &define_variable ("LT$var",
+ "\$(LIBTOOL) --mode=compile $libtool_tag$value",
+ INTERNAL)
if var ('LIBTOOL');
}
@@ -5447,11 +5497,15 @@
my ($lang) = @_;
my ($var, $value) = ($lang->lder, $lang->ld);
+ my $libtool_tag = '';
+ $libtool_tag = '--tag=' . $lang->libtool_tag . ' '
+ if $lang->libtool_tag && exists $libtool_tags{$lang->libtool_tag};
# CCLD = $(CC).
&define_variable ($lang->lder, $lang->ld, INTERNAL);
# CCLINK = $(CCLD) blah blah...
&define_variable ($lang->linker,
- ((var ('LIBTOOL') ? '$(LIBTOOL) --mode=link ' : '')
+ ((var ('LIBTOOL') ?
+ '$(LIBTOOL) --mode=link ' . $libtool_tag : '')
. $lang->link),
INTERNAL);
}
Index: tests/libtool3.test
===================================================================
RCS file: /cvs/automake/automake/tests/libtool3.test,v
retrieving revision 1.5
diff -u -r1.5 libtool3.test
--- tests/libtool3.test 1 Jan 2004 18:54:20 -0000 1.5
+++ tests/libtool3.test 2 Jan 2004 18:37:21 -0000
@@ -88,5 +88,15 @@
$FGREP 'a.lo:' Makefile.in
./configure
+
+# opportunistically check that --tag=CC is used when supported
+if test -n "`./libtool --help | grep tag=TAG`"; then
+ grep 'LTCOMPILE.*mode=compile --tag=CC' Makefile.in
+ grep 'LINK.*mode=link --tag=CC' Makefile.in
+ # We also expect --tag=CC to appear twice in the explicit rule a.lo.
+ # (The first time if am__fastdepCC is true, the second if it is not.)
+ test 2 = `grep 'am__fastdepCC.*mode=compile --tag=CC' Makefile.in | wc -l`
+fi
+
$MAKE
$MAKE distcheck
Index: tests/subobj9.test
===================================================================
RCS file: /cvs/automake/automake/tests/subobj9.test,v
retrieving revision 1.6
diff -u -r1.6 subobj9.test
--- tests/subobj9.test 14 Nov 2003 21:26:01 -0000 1.6
+++ tests/subobj9.test 2 Jan 2004 18:37:21 -0000
@@ -1,5 +1,5 @@
#! /bin/sh
-# Copyright (C) 2002 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004 Free Software Foundation, Inc.
#
# This file is part of GNU Automake.
#
@@ -56,5 +56,12 @@
# Skip this test on configure errors (e.g., broken C++ compilers).
./configure || exit 77
+
+# opportunistically check that --tag=CXX is used when supported
+if test -n "`./libtool --help | grep tag=TAG`"; then
+ grep 'LTCXXCOMPILE.*mode=compile --tag=CXX' Makefile.in
+ grep 'CXXLINK.*mode=link --tag=CXX' Makefile.in
+fi
+
$MAKE
$MAKE distcheck
--
Alexandre Duret-Lutz