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IRIX compiler omits some dependencies with -MDupdate
From: |
Ralf Wildenhues |
Subject: |
IRIX compiler omits some dependencies with -MDupdate |
Date: |
Sat, 13 May 2006 11:25:44 +0200 |
User-agent: |
Mutt/1.5.11+cvs20060403 |
Somehow, IRIX64 6.5 cc and CC, presenting themselves as
MIPSpro Compilers: Version 7.4.4m
have a quite buggy `-MDupdate' mechanism; it more or less randomly
forgets to list some headers included with double quotes; or maybe only
the first one, I don't know. For example, the test in m4/depend.m4
leads to this dependency file:
| sub/conftest.o : \
| sub/conftst4.h sub/conftst5.h sub/conftst6.h sub/conftst2.h sub/conftst3.h
Weird, huh? Note it also forgets to add the .c file, but that may be
intended, and I don't think it breaks dependency tracking, due to the
inference rules Automake puts in place. Anyway, the new depcomp6.test
exposes this failure -- so at least adding that paid out already. :-)
For lack of more knowledge, how about this check to diagnose and skip
this depcomp method? This will make depcomp fall back to depmode
`none', or `dashmstdout' (if --enable-dependency-tracking was given).
It'd probably be good if someone with a support contract could file a
bug...
Cheers,
Ralf
* m4/depend.m4 (_AM_DEPENDENCIES): The IRIX MIPSpro compiler
7.4.4m may omit the first included header dependency information
with `-MDupdate'. Refine test to catch this.
Index: m4/depend.m4
===================================================================
RCS file: /cvs/automake/automake/m4/depend.m4,v
retrieving revision 1.36
diff -u -r1.36 depend.m4
--- m4/depend.m4 9 Apr 2006 07:46:55 -0000 1.36
+++ m4/depend.m4 13 May 2006 09:22:39 -0000
@@ -99,6 +99,7 @@
depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
$SHELL ./depcomp $depcc -c -o sub/conftest.${OBJEXT-o} sub/conftest.c \
>/dev/null 2>conftest.err &&
+ grep sub/conftst1.h sub/conftest.Po > /dev/null 2>&1 &&
grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 &&
grep sub/conftest.${OBJEXT-o} sub/conftest.Po > /dev/null 2>&1 &&
${MAKE-make} -s -f confmf > /dev/null 2>&1; then
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