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* compiler detection
@ 2020-08-22 20:42 Jan Stary
  2020-08-22 21:11 ` Måns Rullgård
  0 siblings, 1 reply; 2+ messages in thread
From: Jan Stary @ 2020-08-22 20:42 UTC (permalink / raw)
  To: sox-devel

It seems ./configure is confused about which compiler it found.

When run without arguments, ./configure will look for (and find) gcc,
without ever bothering to look for cc.

With CC specified, using either of

	./configure CC=cc
	env CC=cc ./configure

this is what happens:

checking for gcc... cc

	$ cc --version
	OpenBSD clang version 10.0.1 
	Target: amd64-unknown-openbsd6.7
	Thread model: posix
	InstalledDir: /usr/bin

checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes

	no

I don't know what effect it has on the subsequent compilation,
or what assumptions thinking "we are using the GNU compiler" leads to.

Jan



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* Re: compiler detection
  2020-08-22 20:42 compiler detection Jan Stary
@ 2020-08-22 21:11 ` Måns Rullgård
  0 siblings, 0 replies; 2+ messages in thread
From: Måns Rullgård @ 2020-08-22 21:11 UTC (permalink / raw)
  To: Jan Stary; +Cc: sox-devel

Jan Stary <hans@stare.cz> writes:

> It seems ./configure is confused about which compiler it found.
>
> When run without arguments, ./configure will look for (and find) gcc,
> without ever bothering to look for cc.
>
> With CC specified, using either of
>
> 	./configure CC=cc
> 	env CC=cc ./configure
>
> this is what happens:
>
> checking for gcc... cc
>
> 	$ cc --version
> 	OpenBSD clang version 10.0.1 
> 	Target: amd64-unknown-openbsd6.7
> 	Thread model: posix
> 	InstalledDir: /usr/bin
>
> checking whether the C compiler works... yes
> checking for C compiler default output file name... a.out
> checking for suffix of executables... 
> checking whether we are cross compiling... no
> checking for suffix of object files... o
> checking whether we are using the GNU C compiler... yes
>
> 	no
>
> I don't know what effect it has on the subsequent compilation,
> or what assumptions thinking "we are using the GNU compiler" leads to.

That checks whether __GNUC__ is defined.  Since clang supports (most)
gcc extensions, it defines this symbol.

-- 
Måns Rullgård


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