Re: stdfn.h: error: conflicting types for 'memcopy' and 'sys_errlist' on Cygwin build

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

> From: Mojca Miklavec 

> To: Tatsuro MATSUOKA 
> Cc: gnuplot-beta 
> Date: 2016/4/11, Mon 19:34
> Subject: Re: stdfn.h: error: conflicting types for 'memcopy' and 'sys_errlist' on Cygwin build
> 
> On 11 April 2016 at 12:26, Tatsuro MATSUOKA  wrote:
>> 
>>  I have completely forgotten to build and install libcerf again.
>>  Sorry for the noise.
>> 
>>  However, why
>> 
>>  LIBCERF_CFLAGS='-I/usr/local/include' \
>>  LIBCERF_LIBS='-L/usr/local/lib -lcerf' \
>> 
>>  flags affect checking functions that are not related libcerf ?
> 
> I'm semi-blindly guessing.
> 
> If configure[.ac] finds out that cerf should be used, it adds
> LIBCERF_CFLAGS to CFLAGS and LIBCERF_LIBS to LDFLAGS. Those CFLAGS and
> LIBS are then used for all the remaining tests.
> 
> If that is indeed the case, I believe there are two "bugs":
> 
> - gnuplot should figure out that libcerf is not working and not add
> those flags at all
> - the flags should be added to the globas set of flags at the end, not
> at the beginning of the configure script

Thank you for your reply

On ubuntu flags

LIBCERF_CFLAGS='-I/usr/local/include' \
LIBCERF_LIBS='-L/usr/local/lib -lcerf' \

are not required so that this might be an issue of my pkg-config setting.

However, looking into config.log, I found the following:

****************************************************************
configure:7376: checking for LIBCERF
configure:7384: $PKG_CONFIG --exists --print-errors "libcerf"
configure:7387: $? = 0
configure:7402: $PKG_CONFIG --exists --print-errors "libcerf"
configure:7405: $? = 0
configure:7481: result: yes

configure:9592: checking for memcpy
configure:9592: gcc -o conftest -g -O2  -I/usr/local/include     -L/usr/local/lib -lcerf   conftest.c -ldl -lm -lcerf  >&5
conftest.c:93:6: warning: conflicting types for built-in function 'memcpy' [enabled by default]
 char memcpy ();
      ^
configure:9592: $? = 0
configure:9592: result: yes
configure:9592: checking for memmove
configure:9592: gcc -o conftest -g -O2  -I/usr/local/include     -L/usr/local/lib -lcerf   conftest.c -ldl -lm -lcerf  >&5



LIBCERF_CFLAGS='-I/usr/local/include  '
LIBCERF_LIBS='-L/usr/local/lib -lcerf  '

****************************************************************

On Ubuntu, pkg-config checks libcerf.
However, "-I/usr/local/include     -L/usr/local/lib -lcerf" is added to the many functions test.

Is the above intended?

Tatsuro