Re: driver/9517: makefile dependencies deleted on error, option -MMD

[Ralf Friedl <Ralf dot Friedl at online dot de>]

The following reply was made to PR driver/9517; it has been noted by GNATS.

From: Ralf Friedl <Ralf dot Friedl at online dot de>
To: bangerth at dealii dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org,
   nobody at gcc dot gnu dot org, gcc-gnats at gcc dot gnu dot org
Cc:  
Subject: Re: driver/9517: makefile dependencies deleted on error, option -MMD
Date: Sun, 16 Mar 2003 17:41:08 +0100

 Dies ist eine mehrteilige Nachricht im MIME-Format.
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 Hi,
 
 $ cat x.cpp
 #include "x.h"
 $ cat x.h
 syntax error
 $ gcc -v
 Reading specs from /usr/lib/gcc-lib/i486-suse-linux/3.2/specs
 Configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib --enable-languages=c,c++,f77,objc,java,ada --enable-libgcj --with-gxx-include-dir=/usr/include/g++ --with-slibdir=/lib --with-system-zlib --enable-shared --enable-__cxa_atexit i486-suse-linux
 Thread model: posix
 gcc version 3.2
 
 $ strace g++ -MMD -c -o x.o x.cpp
 execve("/usr/bin/g++", ["g++", "-MMD", "-c", "-o", "x.o", "x.cpp"], [/* 56 vars */]) = 0
 ...
 fork()                                  = 9307
 wait4(-1, [WIFEXITED(s) && WEXITSTATUS(s) == 1], 0, NULL) = 9307
 --- SIGCHLD (Child exited) ---
 stat64("x.d", {st_mode=S_IFREG|0600, st_size=15, ...}) = 0
 unlink("x.d")                           = 0
 
 cc1plus:
 ...
 open("x.d", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
 fstat64(3, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x1556b000
 write(3, "x.o: x.cpp x.h\n", 15)        = 15
 close(3)                                = 0
 
 
 So cc1plus creates the file x.d, and g++ deletes it after it gets exitstaus == 1.
 I also tried gcc and cc1, the result is the same.
 
 I have included the specs file.
 
 Ralf Friedl
 
 bangerth at dealii dot org schrieb:
 
 > Synopsis: makefile dependencies deleted on error, option -MMD
 >
 > State-Changed-From-To: open->feedback
 > State-Changed-By: bangerth
 > State-Changed-When: Fri Mar 14 02:15:28 2003
 > State-Changed-Why:
 >     I can't reproduce this behavior: the .d file is always
 >     created for me, irrespective of errors in .h or .c files.
 >     Can you send us the transcript of a shell session that
 >     shows this behavior?
 >
 >     Thanks
 >       Wolfgang
 >
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9517
 
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