Re: GCC, Objective-C and C99

[Paul Eggert]

On 8/27/20 2:24 PM, Alan Third wrote:
> What's really odd is that I never had this problem when I built on a
> VM based off Debian Jessie, but I now do with the Debian Stretch
> Docker image. I guess something's changed with GCC.

Perhaps the newer GCC no longer needs -std=c99 when compiling C files (so 
'configure' doesn't add the option automatically), but for some reason GCC still 
rejects declarations in for loops when compiling Objective C files unless you 
also specify -std=c99.

If this guess is correct, perhaps simply putting -std=c99 into the following 
line in configure.ac would work around this GCC glitch.

      ## Extra CFLAGS applied to src/*.m files.
      GNU_OBJC_CFLAGS="$GNU_OBJC_CFLAGS -fgnu-runtime -Wno-import 
-fconstant-string-class=NSConstantString -DGNUSTEP_BASE_LIBRARY=1 
-DGNU_GUI_LIBRARY=1 -DGNU_RUNTIME=1 -DGSWARN -DGSDIAGNOSE"