[sr #110425] autoconf 2.70 generated configure file does not enable -std=gnu99 on Mac OS X 10.5

URL:
  <https://savannah.gnu.org/support/?110425>

                 Summary: autoconf 2.70 generated configure file does not
enable -std=gnu99 on Mac OS X 10.5
                 Project: Autoconf
            Submitted by: haible
            Submitted on: Sat 16 Jan 2021 11:49:59 AM CET
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: Mac OS

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Details:

This is a regression in autoconf 2.70, compared to version 2.69:

Take a tarball with C source code that makes use of C99 features. For
example:

./gnulib-tool --create-testdir --dir=../testdir5 --single-configure dfa

(with current gnulib).

Build it on Mac OS X 10.5, with CC="gcc -m64".

With autoconf 2.69, the config.status file contains

S["CC"]="gcc -m64 -std=gnu99"

and the compilation goes through.

With autoconf 2.70, the config.status file contains

S["CC"]="gcc -m64"

and the compilation fails with errors such as "error: 'for' loop initial
declaration used outside C99 mode".






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