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From: colvert@ro.com (Paul Colvert)
Subject: SGI GNAT Question? (Long)
Date: 1999/03/02
Message-ID: <7bflkk$78i$1@news.ro.com>#1/1
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X-Authenticated: colvert on POP host sh1.ro.com.
Organization: Renaissance Internet Services
Reply-To: colvert@ro.com
Newsgroups: comp.lang.ada
Date: 1999-03-02T00:00:00+00:00
List-Id: <comp.lang.ada>

Greetings All!

I have something of a mystery happening when using the GNAT Ada
compiler (GNAT 3.11p) on a SGI Onyx. I was hoping that someone out
there could enlighten me with this issue. I am sorry if this letter is
somewhat long, but it was the best that I could do. Thanks.

I have a simulation written in Ada95 that I am trying to build. My
source code directory looks something like this:

src/
....common/
...........common_files.ads
...........common_files.adb
....models/
...........model_1/
...................model_1.ads
...................model_1.adb
...........model_2/
...................model_2.ads
...................model_2.adb
...........model_3/
...................model_3.ads
...................model_3.adb
....linklib/
............main_program_1.adb
............main_program_2.adb

After successfully compiling the "common" source directory using this
command:

  gcc -c -g -O0 -n32 /the.absolute.path/filename

and each of the "models" source directories using this command:

  gcc -c -g -O0 -n32 -I/src/common /the.absolute.path/filename

I successfully compile two different "mains" in the "linklib" source
directory using this command:

  gcc -c -g -O0 -n32 \
    -I/src/common \
    -I/src/models/model_1 \
    -I/src/models/model_2 \
    -I/src/models/model_3 \
    /the.absolute.path/filename

At this point, I was able to bind and link the first "main" using the
following commands:

  gnatbind -A -n32 \
    -I/src/common \
    -I/src/models/model_1 \
    -I/src/models/model_2 \
    -I/src/models/model_3 \
    -I/src/linklib \
    main_program_1.ali

  gnatlink -A -n32 -o main_program_1 main_program_1.ali

But when I try to do the same thing with the second "main" using the
same commands, the gnatlink command errors out saying that it could not
find the file "common_files.ads". This appeared to be some kind of path
problem. After some man page reading, I defined two environment
variables, ADA_INCLUDE_PATH and ADA_OBJECTS_PATH, as this:

ADA_INCLUDE_PATH=\
/src/linklib:\
/src/models/model_1:\
/src/models/model_2:\
/src/models/model_3:\
/src/common

ADA_OBJECTS_PATH=\
/src/linklib:\
/src/models/model_1:\
/src/models/model_2:\
/src/models/model_3:\
/src/common

Now, I am able to successfully bind and link both programs using the
following commands:

  gnatbind -A -n32 main_program_1.ali

  gnatlink -A -n32 -o main_program_1 main_program_1.ali

and

  gnatbind -A -n32 main_program_2.ali

  gnatlink -A -n32 -o main_program_2 main_program_2.ali

Can anyone tell me why first method would work for one "main" but not
the other? I know I can use the environment variable method, but I am
really puzzled about the first method. Any help that could be offered
would be greatly appreciated. Thanks!

P.S. For those who may not know, the "-n32" option is a SGI specific
ABI (Application Binary Interface).

--
Paul Colvert
colvert@ro.com