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Date: Tue, 16 Dec 2008 06:11:00 -0000
Message-Id: <20081216.151100.68033879.kaminaga@sm.sony.co.jp>
To: gcc-help@gcc.gnu.org
Subject: #line directive and -D option
From: Hiroki Kaminaga <kaminaga@sm.sony.co.jp>
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Hi,

When #line directive and -D NAME=DEFINITION is used togather, I get
a compile error. Below is what I tried:

$ cat macro-test.c 
#if !defined(MYNAME)
#define MYNAME __FILE__
#endif
#line 5 MYNAME
#include <stdio.h>
int main(void)
{
  printf ("%s: .... \n", __FILE__);
  return 0;
}

$ cat Makefile 
CROSS=
CC=$(CROSS)gcc
all: 
	$(CC) $(shell pwd)/macro-test.c -o macro-test
	$(CC) $(shell pwd)/macro-test.c -o macro-test2 -D MYNAME="macrotest"

$ make
gcc /home/kaminaga/tmp/dir/macro-test.c -o macro-test
gcc /home/kaminaga/tmp/dir/macro-test.c -o macro-test2 -D MYNAME="macrotest"
/home/kaminaga/tmp/dir/macro-test.c:4:9: "macrotest" is not a valid filename
make: *** [all] Error 1

I'm using (old) FC3 gcc version 3.4.2 20041017 (Red Hat 3.4.2-6.fc3).
I get same result on CentOS 5 gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)


>From gcc info, -D option states

`-D NAME=DEFINITION'
     The contents of DEFINITION are tokenized and processed as if they
     appeared during translation phase three in a `#define' directive.
     In particular, the definition will be truncated by embedded
     newline characters.

I don't know much about above "translation phase three", and when #line
is processed, so is this a bug or GCC constraint?


Thanks in Advance,

(Hiroki Kaminaga)
t
--