Re: Update on the Modern C initiative

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On Thu, Nov 30, 2023 at 06:09:55PM +0100, Florian Weimer wrote:
> nbdkit               rjones

Can you help me to understand the build error in this log?

https://gitlab.com/fweimer-rh/fedora-modernc-logs/-/raw/main/logs/n/nbdkit.log?ref_type=heads

I'm not exactly sure what / where the error is supposed to be.

Possibly it is complaining about this autoconf test, but I don't
understand what's wrong with the cast, since AFAIK making a pointer
"more const" should be fine:

  configure:20816: checking if environ is declared in header files
  configure:20833: gcc -c -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Werror=implicit-function-declaration -Werror=implicit-int -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64   -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer   conftest.c >&5
  conftest.c: In function 'test':
  conftest.c:62:22: error: initialization of 'const char **' from incompatible pointer type 'char **'
     62 |   const char **env = environ;
        |                      ^~~~~~~

(source: https://gitlab.com/nbdkit/nbdkit/-/blob/380f975bb9a07063f370835c51e1cd248a799485/configure.ac#L327)

Rich.

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