bug#26735: Unable to build emacs with Intel compilers

[Paul Eggert]

> I'm trying to build emacs 25.2 with Intel 17.0.2 on CentOS 7.3, but the build 
> is crashing with the following error message:
>
>
> alloc.c(1383): error: identifier "max_align_t" is undefined
>     return (MALLOC_IS_GC_ALIGNED || (intptr_t) p % GCALIGNMENT == 0
>             ^
>
> alloc.c(1407): error: identifier "max_align_t" is undefined
>     if (! MALLOC_IS_GC_ALIGNED)
>           ^
>
>
> Do you have any idea what might be causing this? I can send you the full build 
> log if it will help.

The build log will help, yes. Please gzip the output of 'configure' and of 
'make' and the contents of 'config.log', and attach the resulting file.

I assume Intel's <stddef.h> does not define max_align_t as C11 requires; is that 
right? If so, the 'configure' command is supposed to arrange for lib/stddef.h to 
define max_align_t.

Apparently this is not working for you. Does 'make' build a file lib/stddef.h at 
all? If not, why not? If so, what does lib/stddef.h contain?