Can EiffelStudio use gcc?

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Jimmy Johnson

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May 9, 2025, 6:12:07 PMMay 9
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I have an late 2013 (i.e. old) iMac.  At seems ES uses clang, which in my case will not handle c++17 constructs for externals.  I installed gcc14 via MacPorts, but executing "gcc" or "gcc --version" calls clang.

Is there a way to make ES use gcc instead of clang, and/or can I get xCode (on Catalina) to use the newer version of gcc?
jjj

Ulrich Windl

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May 10, 2025, 3:44:13 PMMay 10
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According to https://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html
you might try option -B

Ulrich

Jimmy Johnson

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May 11, 2025, 10:58:24 PMMay 11
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Okay, how do I make EiffelStudio (GUI version) do that?

Jocelyn Fiat

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May 12, 2025, 2:52:08 AMMay 12
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Hi,

Check the $ISE_EIFFEL/studio/spec/$ISE_PLATFORM/include/config.sh
You can either edit this file to customize it.
Or you can also set the CFLAGS environment variable (by default it is set by the compiler to  '-pipe -fno-common -fPIC'


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Jimmy Johnson

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May 14, 2025, 2:51:22 PMMay 14
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Thanks Jocelyn for a direct answer to the question, but I would not know how to customize that file.  I use Eiffel so that I don't have to do such stuff.

Anyway, I now don't think I need that, because I got a C++17 project to compile in Xcode.  So, I guess I need to pass a flag to the compiler (which I think is clang) to tell the compiler to use C++17 options.
How do I set this flag in EiffelStudio?  Is it in the "project settings"?  ecf file?

If it is set with an environment variable (e.g. CFLAGS?) instead, that will change all projects, right?  Is there any harm in setting it for all projects?
thanks,
jjj

rfo amalasoft.com

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May 14, 2025, 2:58:12 PMMay 14
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Hi Jimmy
Have a look at your project settings,, from estudio, under "Externals" 
Roger
From: eiffel...@googlegroups.com <eiffel...@googlegroups.com> on behalf of Jimmy Johnson <eiffe...@gmail.com>
Sent: Wednesday, May 14, 2025 2:51 PM
To: Eiffel Users <eiffel...@googlegroups.com>
Subject: Re: [eiffel-users] Can EiffelStudio use gcc?
 

Jimmy Johnson

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May 14, 2025, 3:13:36 PMMay 14
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Did that.  I don't see anything useful here.

But, let me try a newer version of EiffelStudio where the  externals settings might work more consistently.

rfo amalasoft.com

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May 14, 2025, 3:29:23 PMMay 14
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Did you try right clicking on the Externals item?  It's not as obvious as it should be.
R


Sent: Wednesday, May 14, 2025 3:13 PM
es_ext.png

Jimmy Johnson

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May 14, 2025, 3:36:10 PMMay 14
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Which one?  I don't see anything related to a compiler flag, saying use C++17.

rfo amalasoft.com

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May 14, 2025, 3:48:43 PMMay 14
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Yup, you're right about that.  You can set flags and such, and you can use env vars within those settings, but the choice of C compiler comes from elsewhere.  You can edit the Makefile.SH I suppose, but it gets clobbered.
You might try setting a flag for what appears in the Makefile.SH, to override a default.
CC = $cc
CPP = $cpp

R

Sent: Wednesday, May 14, 2025 3:36 PM

Jimmy Johnson

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May 14, 2025, 4:04:37 PMMay 14
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That was my original question.  Now I don't want to change compilers, because clang will accept C++17 options if it is told to.  I just don't know how to pass that flag from EiffelStudio to the external compilation.
jjj

rfo amalasoft.com

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May 15, 2025, 8:14:09 AMMay 15
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Hi Jimmy
I'm just wondering if the image I attached to my earlier response (about right-clicking on the Externals menu) made it to you.  It seems to show "Add C flag" clearly.  Isn't that what you're looking to do?
R
Sent: Wednesday, May 14, 2025 4:04 PM
es_ext.png

Jimmy Johnson

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May 15, 2025, 12:40:26 PMMay 15
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Yes!  Thanks.  But I had to right-click-and-hold.  The menu disappeared on button release, so I was not seeing the context menu which I just found by accident thanks to your persistence.

Now I get multiple "error:  invalid argument '-std=c++17' not allowed with 'C' " errors during external compilation.  So now to figure out why.

Thanks again,
jjj

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