Re: gnuplot_date[] in timestamp.h is empty after "make" in building source from git

[Tatsuro M. <tma...@ya...>]

>>  I checked out git source
>>  git clone https://git.code.sf.net/p/gnuplot/gnuplot-main gnuplot 
>> 
>>  and
>> 
>>  ./prepare
>>  ./configure (options)
>>  make
>> 
>>  The produced src/timestamp.h is
>> 
>>  #ifndef GNUPLOT_TIMEBASE_H_INCLUDED
>>  #define GNUPLOT_TIMEBASE_H_INCLUDED
>>  const char gnuplot_date[] = "";
>>  #endif /* GNUPLOT_TIMEBASE_H_INCLUDED */
>> 
>>  I have observed the above on Cygwin and ubuntu 16.04.
>> 
>>  What is happening?
> 
> Works here:
> 
>   dima@scrawny:/tmp/gnuplot-main/src$ make -n timestamp.h
>   echo Making timestamp.h
>   echo "#ifndef GNUPLOT_TIMEBASE_H_INCLUDED" >timestamp.ht
>   echo "#define GNUPLOT_TIMEBASE_H_INCLUDED" >>timestamp.ht
>   echo "const char gnuplot_date[] = \"`git log -1 --format=%ci | 
> cut -b-11`\";" >>timestamp.ht
>   echo "#endif /* GNUPLOT_TIMEBASE_H_INCLUDED */" >> 
> timestamp.ht
>   if cmp -s timestamp.h timestamp.ht; then rm -f timestamp.ht; else mv 
> timestamp.ht timestamp.h; fi
> 
>   dima@scrawny:/tmp/gnuplot-main/src$ make timestamp.h 
>   Making timestamp.h
> 
>   dima@scrawny:/tmp/gnuplot-main/src$ cat timestamp.h 
>   #ifndef GNUPLOT_TIMEBASE_H_INCLUDED
>   #define GNUPLOT_TIMEBASE_H_INCLUDED
>   const char gnuplot_date[] = "2018-02-11 ";
>   #endif /* GNUPLOT_TIMEBASE_H_INCLUDED */
> 
>   dima@scrawny:/tmp/gnuplot-main/src$ git log -1 --format=%ci | cut -b-11
>   2018-02-11 
> 
> Which part of that is different for you? Note that this logic changed
> semi-recently in dd0c5adaa638647

Ah!

It seems that current mechanism does not build proper timestamp.h
in case of off-place build.

Correctly, what I have done.

git clone https://git.code.sf.net/p/gnuplot/gnuplot-main gnuplot
./prepare
mkdir build
cd build
../configure (options)
make

The aboves give empty gnuplot_date[]

If I execute on place build

git clone https://git.code.sf.net/p/gnuplot/gnuplot-main gnuplot
./prepare
./configure (options)
make

The aboves give correct gnuplot_date[]

Tatsuro