Hi Akim,

On 6/24/19 5:56 PM, Akim Demaille wrote:
> Hi Tim,
> 
>> Le 24 juin 2019 à 11:42, Tim Rühsen <tim.ruehsen@gmx.de> a écrit :
>>
>> Hi Akim,
>>
>> Your proposal works here on Debian after I switched to mawk via
>> 'update-alternatives --config awk', selecting mawk. It detects two
>> occurrences of $< in our (project) Makefiles correctly.
>>
>> Switching back to the old maint.mk, brings back the error message about
>> '-e'. I just did this to make sure.
> 
> Perfect, thanks.  Installed.

I updated gnulib to your commit
(47405621b3066c035b4b98d2db934d550aaed1ad) and - sorry to say - two CI
runners broke. That are Arch Linux and Fedora 30.

Output on Fedora 30 from 'make syntax-check':

prohibit_gnu_make_extensions
Error: lib/Makefile: $< in a non implicit rule
# makefile (from 'lib/Makefile', line 1310)
NEXT_STRING_H = <string.h>
# makefile (from 'lib/Makefile', line 1409)
REPLACE_LOCALECONV = 0
# makefile (from 'lib/Makefile', line 1231)
LTLIBICONV =
# makefile (from 'lib/Makefile', line 476)
ETAGS = etags
# environment
halt =
# makefile (from 'lib/Makefile', line 1450)
REPLACE_PTSNAME = 0
# automatic
?F = $(notdir $?)
# makefile (from 'lib/Makefile', line 784)
GNULIB_STRTOD = 0
# makefile (from 'lib/Makefile', line 1410)
REPLACE_LOCALTIME = 0

... (many more lines like these) ...

MAKE_VERSION := 4.2.1
# makefile (from 'lib/Makefile', line 540)
GNULIB_ATOLL = 0
# variable set hash-table stats:
# Load=1368/2048=67%, Rehash=1, Collisions=6067/4772=127%
Error: lib/Makefile: $< in a non implicit rule
%.lo: %.c
#  recipe to execute (from 'lib/Makefile', line 2150):
        $(AM_V_CC)depbase=`echo $@ | sed
's|[^/]*$$|$(DEPDIR)/&|;s|\.lo$$||'`;\
        $(LTCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
        $(am__mv) $$depbase.Tpo $$depbase.Plo
Error: lib/Makefile: $< in a non implicit rule
%.o: %.c
#  recipe to execute (from 'lib/Makefile', line 2134):
        $(AM_V_CC)depbase=`echo $@ | sed
's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`;\
        $(COMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
        $(am__mv) $$depbase.Tpo $$depbase.Po
Error: lib/Makefile: $< in a non implicit rule
%.obj: %.c
#  recipe to execute (from 'lib/Makefile', line 2142):
        $(AM_V_CC)depbase=`echo $@ | sed
's|[^/]*$$|$(DEPDIR)/&|;s|\.obj$$||'`;\
        $(COMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@
`$(CYGPATH_W) '$<'` &&\
        $(am__mv) $$depbase.Tpo $$depbase.Po
Error: lib/Makefile: $< in a non implicit rule
(%): %
#  recipe to execute (built-in):
        $(AR) $(ARFLAGS) $@ $<
Error: lib/Makefile: $< in a non implicit rule
%.out: %
#  recipe to execute (built-in):
        @rm -f $@
         cp $< $@
Error: lib/Makefile: $< in a non implicit rule
%:: s.%
#  recipe to execute (built-in):
        $(GET) $(GFLAGS) $(SCCS_OUTPUT_OPTION) $<
Error: lib/Makefile: $< in a non implicit rule
%:: SCCS/s.%
#  recipe to execute (built-in):
        $(GET) $(GFLAGS) $(SCCS_OUTPUT_OPTION) $<
make: *** [maint.mk:439: sc_prohibit_gnu_make_extensions] Error 1



[root@61f4306ca485 wget2]# cd gnulib
[root@61f4306ca485 gnulib]# git branch
* (HEAD detached at 47405621b)
  master
[root@61f4306ca485 gnulib]# git log
commit 47405621b3066c035b4b98d2db934d550aaed1ad (HEAD, origin/master,
origin/HEAD, master)
Author: Akim Demaille <akim.demaille@gmail.com>
Date:   Tue Jun 25 08:11:34 2019 +0200

[root@61f4306ca485 gnulib]# awk --version
GNU Awk 4.2.1, API: 2.0 (GNU MPFR 3.1.6-p2, GNU MP 6.1.2)


Regards, Tim