Re: Making MSVC/clang-cl succeed AC_PROG_CC C11 discovery

[Paul Eggert]

On 2024-04-26 08:10, Zack Weinberg wrote:

> I think what we should do here is fold AC_C_VARARRAYS into AC_PROG_CC.
> Take the test for VLAs completely out of _AC_C_C99_TEST_MAIN, but
> unconditionally *run* a test for VLAs as part of AC_PROG_CC.  If that
> test fails, and __STDC_NO_VLA__ was not defined by the compiler,
> then AC_DEFINE([__STDC_NO_VLA__], 1)

Although the basic strategy sounds reasonable, AC_PROG_CC is documented 
to operate by setting compiler options not via AC_DEFINE, so presumably 
this should put -D__STDC_NO_VLA__ into $CC rather than use AC_DEFINE.

I installed the attached patch, which is less ambitious but should 
address the original problem report. The attached patch doesn't preclude 
your suggestion, which can be done later as needed.

0001-Port-better-to-MSVC.patch
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