From:	ryot AT bigfoot DOT com (George Ryot)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Implicit make rules fail to link with std C++ library
Message-ID:	<37897534.8132755@news.clara.net>
X-Newsreader:	Forte Agent 1.5/32.452
X-No-Archive:	yes
MIME-Version:	1.0
Lines:	48
Date:	Fri, 09 Jul 1999 22:20:20 GMT
NNTP-Posting-Host:	195.8.91.168
X-Complaints-To:	abuse AT clara DOT net
X-Trace:	nnrp4.clara.net 931558820 195.8.91.168 (Fri, 09 Jul 1999 23:20:20 BST)
NNTP-Posting-Date:	Fri, 09 Jul 1999 23:20:20 BST
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

I'm trying to set up a simple makefile to build C++ programs.

The following line compiles and links without error:

C:\C\test>gxx -O -Wall -Werror -o hello.exe hello.cpp

But when I run make I get:

C:\C\test>make
gcc     hello.cpp   -o hello
c:/djgpp/tmp\ccci43cl(.text+0x19):hello.cpp:
 undefined reference to `cout'
c:/djgpp/tmp\ccci43cl(.text+0x1e):hello.cpp:
 undefined reference to `ostream::op
erator<<(char const *)'
make.exe: *** [hello] Error 1

The link phase seems to be failing to link with the standard C++
library.  Also my CFLAGS are not being picked up.

Here are the test files I am using:

/*---- hello.cpp ----*/
#include <iostream.h>
int main(void)
{
    cout << "Hello World!\n";
    return(0);
}

# ---- makefile ----
TARGETS = hello
CFLAGS = -O -Wall -Werror

all: $(TARGETS)

clean:
    @for %x in ($(TARGETS)) do rm -f %x %x.o %x.exe


Adding the line "CXX = gxx" solves the linking problem, and changing
CFLAGS to CPPFLAGS solves the other but neither of these seem to me to
be the best answer.  Building C++ programs with make should be as
straight forward as with C programs, did I miss something in the FAQ
or could my installation be at fault.  Any debugging of the files
above or pointers to documentation gratefully received.
-- 
george

- Raw text -