gcc multiple instances conflict

gcc multiple instances conflict

[Vinod Joseph]

Hi

I have installed gcc 2.95.3 on a redhat 9 which
already had gcc 3.2.2.

i want my application to be built and use make with
gcc 2.95.3 ONLY

Please can u guide me how to solve this problem.

I have tried alias in bashrc but GNU make and g++
still used gcc 3.2.2

Thanks in advance for ur timely guidance

Vinod

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Re: gcc multiple instances conflict

[Eljay Love-Jensen]

Hi Vinod,

You can put the location of GCC 2.95.3 first in your PATH variable.

You can make sure that any makefiles haven't hard coded the path to GCC 3.2.2 in the file itself.  One convention for makefiles is to use CPP for the preprocessor (gcc -E), CC for the C compiler (gcc), CXX for the C++ compiler (g++), LINK for the linker (gcc).  So those are my first "usual suspects".

You could hard code the path to GCC 2.95.3 in the make file itself.  (Similar to previous.)  Or pass in those settings to the make file explicitly, on the command line.

Makefiles do not honor your bash alias settings, because a make script is a lot like a non-interactive shell with its own environment.  The bash alias settings are not "inherited" in the make environment.

HTH,
--Eljay

Re: gcc multiple instances conflict

[Vinod Joseph]

Dear Eljay/Phil/Claudio/Chris et all

I have installed gcc 2.95.2 and have an installation
problem... i guess it is the primary reason why the
application make file compiles c++ programs with gcc
3.2.2 and returns errors...

The application works only on gcc 2.95.2(3)

gcc 2.95.2 is installed successfully when i give $make
LANGUAGES=c

but fails with the following errors on giving
$make 
( Note - failure is in g++ )

/home/vinod/gcc/gcc-2.95.2/gcc/xgcc
-B/home/vinod/gcc/gcc-2.95.2/gcc/
-B/usr/local/i686-pc-linux-gnu/bin/ -c -g -O2
-fvtable-thunks -D_GNU_SOURCE -fno-implicit-templates
-I. -I. -nostdinc++ -D_IO_MTSAFE_IO indstream.cc
indstream.cc: In method `struct streampos
indirectbuf::seekoff(long long int, ios::seek_dir, int
= 3)':
indstream.cc:82: `struct streampos' used where a `int'
was expected
indstream.cc:85: `struct streampos' used where a `int'
was expected
indstream.cc:87: `struct streampos' used where a `int'
was expected
indstream.cc:89: conversion from `int' to non-scalar
type `streampos' requested
indstream.cc: In method `struct streampos
indirectbuf::seekpos(_G_fpos64_t, int = 3)':
indstream.cc:99: `struct streampos' used where a `int'
was expected
indstream.cc:102: `struct streampos' used where a
`int' was expected
indstream.cc:104: `struct streampos' used where a
`int' was expected
indstream.cc:106: conversion from `int' to non-scalar
type `streampos' requested
make[1]: *** [indstream.o] Error 1
make[1]: Leaving directory
`/home/vinod/gcc/gcc-2.95.2/i686-pc-linux-gnu/libio'
make: *** [all-target-libio] Error 2
[root@vinod gcc-2.95.2]#

Please advise me what to do. I am a newbie to this....

Thanks in advance.....

Vinod


--- Eljay Love-Jensen <eljay@adobe.com> wrote:
> Hi Vinod,
> 
> You can put the location of GCC 2.95.3 first in your
> PATH variable.
> 
> You can make sure that any makefiles haven't hard
> coded the path to GCC 3.2.2 in the file itself.  One
> convention for makefiles is to use CPP for the
> preprocessor (gcc -E), CC for the C compiler (gcc),
> CXX for the C++ compiler (g++), LINK for the linker
> (gcc).  So those are my first "usual suspects".
> 
> You could hard code the path to GCC 2.95.3 in the
> make file itself.  (Similar to previous.)  Or pass
> in those settings to the make file explicitly, on
> the command line.
> 
> Makefiles do not honor your bash alias settings,
> because a make script is a lot like a
> non-interactive shell with its own environment.  The
> bash alias settings are not "inherited" in the make
> environment.
> 
> HTH,
> --Eljay
> 
> 

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Re: gcc multiple instances conflict

[Claudio Bley]

On Wed, Sep 17, 2003 at 07:39:01PM -0700, Vinod Joseph wrote:
> Hi

Hi.
 
> I have installed gcc 2.95.3 on a redhat 9 which
> already had gcc 3.2.2.

I don't know what your reasons are, but be aware that you can't link a
C++ program compiled with gcc 2.95 to libraries compiled with 3.x.

> i want my application to be built and use make with
> gcc 2.95.3 ONLY
> 
> Please can u guide me how to solve this problem.
> 
> I have tried alias in bashrc but GNU make and g++
> still used gcc 3.2.2

Aliases are not expanded when the shell is not interactive. So, that
won't work.

If you installed gcc 2.95 into another location than gcc 3.2.2
(e.g. /usr/local/bin) you just need to add this directory before
the directory where gcc 3.x is installed in the PATH variable:

$ export PATH="/usr/local/bin:$PATH"

Alternatively, you can specify which compiler make calls when setting
the CC and CXX variables:

$ make CC=/usr/local/bin/gcc CXX=/usr/local/bin/g++

Of course, that assumes that you used these variables in your Makefile
rules (which virtually every Makefile does).

g++ (3.2.2) always uses gcc 3.2.2. You can't change the behaviour of
that command you just need to call the g++ which came with gcc 2.95.

Read 'man bash' for more information.

HTH

-- 
Claudio Bley                                 ASCII ribbon campaign (")
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