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D - bug on linux: Error: Error reading file 'object.d'

reply Antti =?iso-8859-1?Q?Syk=E4ri?= <jsykari gamma.hut.fi> writes:
While trying the compiler on linux, I was surprised to find out that
setting default include path in /etc/dmd.conf does not seem to work. If
I set the include path on the command line, it works.

jsykari:~/work/d_tests% dmd test2.d
Error: Error reading file 'object.d'
jsykari:~/work/d_tests% dmd -I/home/jsykari/dmd/src/phobos test2.d  
gcc test2.o -o test2 -lphobos -lpthread -lm 
jsykari:~/work/d_tests%

/etc/dmd.conf:
---

[Environment]

DFLAGS=-I/home/jsykari/dmd/src/phobos/

---

I found out using strace that dmd actually reads /etc/dmd.conf, but then
fails to open object.d. Here are relevant snippets from its output,
first of the failed attempt:

jsykari:~/work/d_tests% strace dmd test.d
[...]
open("/etc/dmd.conf", O_RDONLY)         = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=61, ...}) = 0
read(3, "\r\n[Environment]\r\n\r\nDFLAGS=-I/hom"..., 61) = 61
close(3)                                = 0
unlink("test.o")                        = 0
open("test.d", O_RDONLY)                = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=403, ...}) = 0
read(3, "import c.stdio;\n\nclass Visitor {"..., 403) = 403
close(3)                                = 0
stat64("object.d", 0xbffff9c0)          = -1 ENOENT (No such file or
directory)
open("object.d", O_RDONLY)              = -1 ENOENT (No such file or
directory)
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...}) = 0
[...]

Then the succeeded attempt:

jsykari:~/work/d_tests% strace dmd test.d -I/home/jsykari/dmd/src/phobos/
[...]
open("/etc/dmd.conf", O_RDONLY)         = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=61, ...}) = 0
read(3, "\r\n[Environment]\r\n\r\nDFLAGS=-I/hom"..., 61) = 61
close(3)                                = 0
unlink("test.o")                        = -1 ENOENT (No such file or
directory)
open("test.d", O_RDONLY)                = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=403, ...}) = 0
read(3, "import c.stdio;\n\nclass Visitor {"..., 403) = 403
close(3)                                = 0
stat64("object.d", 0xbffff9a0)          = -1 ENOENT (No such file or
directory)
stat64("/home/jsykari/dmd/src/phobos/object.d", {st_mode=S_IFREG|0644,
st_size=1751, ...}) = 0
open("/home/jsykari/dmd/src/phobos/object.d", O_RDONLY) = 3
[...]

-Antti
Aug 27 2003
parent reply "Walter" <walter digitalmars.com> writes:
I have no idea why it is failing for you. It works on my linux box. Check
out \dmd\src\dmd\inifile.c and see if you see something obviously wrong?

"Antti Sykäri" <jsykari gamma.hut.fi> wrote in message
news:slrnbkqh8j.s51.jsykari pulu.hut.fi...

 While trying the compiler on linux, I was surprised to find out that
 setting default include path in /etc/dmd.conf does not seem to work. If
 I set the include path on the command line, it works.

 jsykari:~/work/d_tests% dmd test2.d
 Error: Error reading file 'object.d'
 jsykari:~/work/d_tests% dmd -I/home/jsykari/dmd/src/phobos test2.d
 gcc test2.o -o test2 -lphobos -lpthread -lm
 jsykari:~/work/d_tests%

 /etc/dmd.conf:
 ---

 [Environment]

 DFLAGS=-I/home/jsykari/dmd/src/phobos/

 ---

 I found out using strace that dmd actually reads /etc/dmd.conf, but then
 fails to open object.d. Here are relevant snippets from its output,
 first of the failed attempt:

 jsykari:~/work/d_tests% strace dmd test.d
 [...]
 open("/etc/dmd.conf", O_RDONLY)         = 3
 fstat64(3, {st_mode=S_IFREG|0644, st_size=61, ...}) = 0
 read(3, "\r\n[Environment]\r\n\r\nDFLAGS=-I/hom"..., 61) = 61
 close(3)                                = 0
 unlink("test.o")                        = 0
 open("test.d", O_RDONLY)                = 3
 fstat64(3, {st_mode=S_IFREG|0644, st_size=403, ...}) = 0
 read(3, "import c.stdio;\n\nclass Visitor {"..., 403) = 403
 close(3)                                = 0
 stat64("object.d", 0xbffff9c0)          = -1 ENOENT (No such file or
 directory)
 open("object.d", O_RDONLY)              = -1 ENOENT (No such file or
 directory)
 fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...}) = 0
 [...]

 Then the succeeded attempt:

 jsykari:~/work/d_tests% strace dmd test.d -I/home/jsykari/dmd/src/phobos/
 [...]
 open("/etc/dmd.conf", O_RDONLY)         = 3
 fstat64(3, {st_mode=S_IFREG|0644, st_size=61, ...}) = 0
 read(3, "\r\n[Environment]\r\n\r\nDFLAGS=-I/hom"..., 61) = 61
 close(3)                                = 0
 unlink("test.o")                        = -1 ENOENT (No such file or
 directory)
 open("test.d", O_RDONLY)                = 3
 fstat64(3, {st_mode=S_IFREG|0644, st_size=403, ...}) = 0
 read(3, "import c.stdio;\n\nclass Visitor {"..., 403) = 403
 close(3)                                = 0
 stat64("object.d", 0xbffff9a0)          = -1 ENOENT (No such file or
 directory)
 stat64("/home/jsykari/dmd/src/phobos/object.d", {st_mode=S_IFREG|0644,
 st_size=1751, ...}) = 0
 open("/home/jsykari/dmd/src/phobos/object.d", O_RDONLY) = 3
 [...]

 -Antti
Aug 28 2003
parent reply Russ Lewis <spamhole-2001-07-16 deming-os.org> writes:
I have been having the same problem ever since the linux version of dmd 
came out.

I went to look at inifile.c, but cannot find it anywhere in any of the 
dmd versions I've ever downloaded.
Aug 28 2003
parent reply "Walter" <walter digitalmars.com> writes:
I've attached inifile.c.

"Russ Lewis" <spamhole-2001-07-16 deming-os.org> wrote in message
news:bil0sp$umd$1 digitaldaemon.com...

 I have been having the same problem ever since the linux version of dmd
 came out.

 I went to look at inifile.c, but cannot find it anywhere in any of the
 dmd versions I've ever downloaded.



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end
Aug 28 2003
parent reply Antti =?iso-8859-1?Q?Syk=E4ri?= <jsykari gamma.hut.fi> writes:
In article <bile7b$1l8e$1 digitaldaemon.com>, Walter wrote:

 I've attached inifile.c.


Thanks! That was certainly helpful.

I think I might have found the source of the bug. In inifile() calls
putenv() with an argument that is inside an OutBuffer and therefore gets
free'd later.  putenv() is defined so that it will not copy its argument
but rather takes its ownership:

From putenv(3) man page:

       The  libc4  and  libc5  and  glibc 2.1.2 versions conform to SUSv2: the
       pointer string given to putenv() is used.  In particular,  this  string
       becomes  part  of  the  environment;  changing it later will change the
       environment.  (Thus, it is an error is to call putenv() with  an  auto-
       matic  variable  as the argument, then return from the calling function
       while string  is  still  part  of  the  environment.)   However,  glibc
       2.0-2.1.1  differs: a copy of the string is used.  On the one hand this
       causes a memory leak, and on the other hand it violates SUSv2. This has
       been fixed in glibc2.1.2.

So if you run dmd on libc 2.0-2.1.1 (which I could imagine your Red Hat
has in /lib) it works fine, but on a newer glibc fails silently and the
environment entry probably gets garbled.

The fix is obvious: change putenv(pn) on line 209 to putenv(strdup(pn)).

The workaround, of course, is to set DFLAGS=whatever in your shell's
environment and not use /etc/dmd.conf because it could mess with it.

-Antti
Aug 28 2003
parent "Walter" <walter digitalmars.com> writes:
Ah, wonderful. I made the fix. Thanks!
Aug 28 2003