Updating the Compiler for the GPS Community Edition 2019 IDE

Question

I've recently started working on a project that requires my complier to be above GNAT 4.8.5 - When I go to: Help > About

You can see that the version I'm using is 4.8.5

Also, when I run the gnatls -v command, I can see this...

[parallels@localhost ~]$ gnatls -v

GNATLS 4.8.5 20150623 (Red Hat 4.8.5-39)
Copyright (C) 1997-2013, Free Software Foundation, Inc.

Source Search Path:
   <Current_Directory>
   /usr/lib/gcc/x86_64-redhat-linux/4.8.5/adainclude/


Object Search Path:
   <Current_Directory>
   /usr/lib/gcc/x86_64-redhat-linux/4.8.5/adalib/


Project Search Path:
   <Current_Directory>
   /usr/x86_64-redhat-linux/lib/gnat
   /usr/share/gpr
   /usr/lib/gnat

[parallels@localhost ~]$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --disable-multilib --enable-languages=c,c++,ada
Thread model: posix
gcc version 7.3.0 (GCC) 
[parallels@localhost ~]$

Please could someone be able to tell me how to update my GNAT compiler? Also, I'm using the Centos 7 Operating System.

Thank you,

Lloyd

? Have you got a manually installed "gcc 7.3.0" in /usr/local/ ? Please edit your question stackoverflow.com/posts/61632284/edit ... to show available gcc -7.3.0 executable's. .... Images unix.meta.stackexchange.com/questions/4086/… — Knud Larsen

Simon Wright Simon Wright · Accepted Answer · 2020-05-06T17:02:24

You don't need to install a compiler, you already have 3 (at least):

gcc 4.8.5 (the system compiler) in /usr/bin
gcc 7.3.0 (that you just built) in /usr/local/bin
gcc 8.3.1 (from GNAT CE 2019) in /home/parallels/opt/GNAT/2019/bin

Your PATH determines which GCC you pick up when you say just gcc, and which GNATLS you pick up when you say just gnatls, .. etc.

According to a previous post, your PATH is:

$ echo $PATH
/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/var/lib/snapd/snap/bin:/home/parallels/.local/bin:/home/parallels/bin/home/parallels/opt/GNAT/2019/bin/home/parallels/opt/GNAT/2019/bin

so when you say just gcc the system looks at the first entry in the PATH (which is colon-separated) and .. there it is! so it executes that.

If you'd built your 7.3.0 GCC with Ada support, it would have found gnatls in the same place. I have a very strong suspicion that you didn't, so when you say just gnatls the system looks in /usr/local/bin - no luck - then in /usr/local/sbin - no luck - then in /usr/bin - whoopee! but that's the 4.8.5 GCC that you don't want.

Looking again at your PATH, the last part is mangled - you've added /home/parallels/bin and /home/parallels/opt/GNAT/2019/bin (twice) without including the colon separators, resulting in a nonexistent path. (/home/parallels/bin may well have been added by the system - I assume that /home/parallels is your home directory).

What you need to do is to make sure that you pick up the compiler that came with GNAT CE 2019 by putting its location first in your PATH. One way of doing this is by editing your shell startup files.

I don't know how CENTOS sets accounts up, and I don't know what your shell is. Assuming it's bash (type ps -p $$, should come back with bash or perhaps -bash; anything else, I can't help), you need to edit one of the shell startup files - I'm a little unclear about this, but I think it'll be ~/.bashrc (~ is shorthand for your home directory); see here for the gory details. Find the last mention of PATH and immediately after that line insert

export PATH=/home/parallels/opt/GNAT/2019/bin:$PATH

Open a new terminal window and say e.g. gnatls -v - you should pick up the GNAT CE 2019 one.

Updating the Compiler for the GPS Community Edition 2019 IDE

2 Answers