From f641ac45d899e5f4be93bd084c191f4971e74b47 Mon Sep 17 00:00:00 2001
From: Tom Tromey <tromey@redhat.com>
Date: Mon, 5 Mar 2001 07:49:42 +0000
Subject: [PATCH] 	* automake.in (register_language): Add entry for
 `-pure'. 	Added `pure=yes' entries for cxx, objc, f77, ppf77, ratfor,
 java. 	(finish_languages): Use `-pure' field of language map.

---
 ChangeLog   |  6 ++++++
 automake.in | 20 +++++++++++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 440bdcbb..51850342 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2001-03-05  Tom Tromey  <tromey@redhat.com>
+
+	* automake.in (register_language): Add entry for `-pure'.
+	Added `pure=yes' entries for cxx, objc, f77, ppf77, ratfor, java.
+	(finish_languages): Use `-pure' field of language map.
+
 2001-03-03  Tom Tromey  <tromey@redhat.com>
 
 	* tests/yaccvpath.test: No need to remove dummy files.
diff --git a/automake.in b/automake.in
index 6db3dbff..5cd3909b 100755
--- a/automake.in
+++ b/automake.in
@@ -375,12 +375,14 @@ my %configure_dist_common = ();
 		    'compile=$(CXX) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS)',
 		    'compiler-name=CXXCOMPILE',
 		    'output-arg=-c -o $@',
+		    'pure=yes',
 		    'c++', 'cc', 'cpp', 'cxx', 'C');
 &register_language ('objc', 'linker=OBJCLINK', 'autodep=OBJC',
 		    'flags=OBJCFLAGS',
 		    'compile=$(OBJC) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_OBJCFLAGS) $(OBJCFLAGS)',
 		    'compiler-name=OBJCCOMPILE',
 		    'output-arg=-c -o $@',
+		    'pure=yes',
                     'm');
 &register_language ('header',
 		    'h', 'H', 'hxx', 'h++', 'hh', 'hpp', 'inc');
@@ -406,17 +408,20 @@ my %configure_dist_common = ();
 		    'compile=$(F77) $(AM_FFLAGS) $(FFLAGS)',
 		    'compiler-name=F77COMPILE',
 		    'output-arg=-c -o $@',
+		    'pure=yes',
 		    'f', 'for', 'f90');
 &register_language ('ppf77', 'linker=F77LINK', 'flags=FFLAGS',
 		    'compile=$(F77) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_FFLAGS) $(FFLAGS)',
 		    'compiler-name=PPF77COMPILE',
 		    'output-arg=-c -o $@',
+		    'pure=yes',
 		    'F');
 &register_language ('ratfor', 'linker=F77LINK',
 		    'flags=RFLAGS', # FIXME also FFLAGS.
 		    'compile=$(F77) $(AM_FFLAGS) $(FFLAGS) $(AM_RFLAGS) $(RFLAGS)',
 		    'compiler-name=RCOMPILE',
 		    'output-arg=-c -o $@',
+		    'pure=yes',
 		    'r');
 # FIXME: for now we can't do dependency tracking for Java.
 # autodep=GCJ
@@ -424,6 +429,7 @@ my %configure_dist_common = ();
 		    'compile=$(GCJ) $(DEFS) $(INCLUDES) $(AM_GCJFLAGS) $(GCJFLAGS)',
 		    'compiler-name=GCJCOMPILE',
 		    'output-arg=-c -o $@',
+		    'pure=yes',
 		    'java', 'class', 'zip', 'jar');
 
 
@@ -1027,7 +1033,14 @@ sub finish_languages
 	next if defined $done{$lang};
 	$done{$lang} = 1;
 
-	$non_c = 0 if $lang !~ /(objc|cxx|f77|ratfor)$/;
+	# If the source to a program consists entirely of code from a
+	# `pure' language, for instance C++ for Fortran 77, then we
+	# don't need the C compiler code.  However if we run into
+	# something unusual then we do generate the C code.  There are
+	# probably corner cases here that do not work properly.
+	# People linking Java code to Fortran code deserve pain.
+	$non_c = 0
+	    if $language_map{$lang . '-pure'} eq 'no';
 
 	if ($comp ne '')
 	{
@@ -5062,6 +5075,11 @@ sub register_language
     $language_map{$language . '-autodep'} = 'no';
     $language_map{$language . '-derived-autodep'} = 'no';
 
+    # `-pure' is `yes' or `no'.  A `pure' language is one where, if
+    # all the files in a directory are of that language, then we do
+    # not require the C compiler or any code to call it.
+    $language_map{$language . '-pure'} = 'no';
+
     foreach my $iter (@options)
     {
 	if ($iter =~ /^(.*)=(.*)$/)
-- 
2.43.5