Re: [igraph] ./configure won't detect GMP

[Szabolcs Horvát]

Hi Tamas,

Actually gmp.h is present in $HOME/local/include.  I'm really confused
about what is going wrong now.  Maybe there's something obvious I'm
missing?

Witness:

$ ls $HOME/local/include
gmp.h  igraph

This is part of the output from ./configure:

checking for libxml/parser.h... yes
checking for __gmpz_add in -lgmp... yes
checking gmp.h usability... no
checking gmp.h presence... no
checking for gmp.h... no
checking that generated files are newer than configure... done

So you are right that it doesn't find gmp.h

But if I crudely remove the checking part from configure.ac and force
it to try to use GMP anyway by setting gmp_support=yes, then igraph
compiles without errors and works fine.

On 2 September 2015 at 22:31, Tamas Nepusz <address@hidden> wrote:
> Hi Szabolcs,
>
> The configure script looks for a header named gmp.h and a library that
> contains the symbol named __gmpz_add. I think that your LDFLAGS is
> okay since it contains a .dylib or .so file that contains __gmpz_add,
> but your CFLAGS variable should be like this:
>
> export CFLAGS=-I$HOME/local/include/gmp
>
> This is because gmp installs its headers in $prefix/include/gmp and
> not in $prefix/include, and igraph tries to include them with #include
> <gmp.h>.
>
> T.
>
> T.
>
>
> On Wed, Sep 2, 2015 at 5:54 PM, Szabolcs Horvát <address@hidden> wrote:
>> Dear All,
>>
>> I'm compiling igraph on OS X 10.10.5 using the system compiler.
>>
>> I'm trying to use GMP 6.0.0 from https://gmplib.org/, which I
>> installed into $HOME/local.  I configure igraph like this:
>>
>> export CFLAGS=-I$HOME/local/include
>> export LDFLAGS=-L$HOME/local/lib
>> ./configure --prefix=$HOME/local
>>
>> The configure script fails to detect GMP.  How can I get it to succeed?
>>
>> Notes: It does detect MacPorts's GMP if I try to use it.  It's also
>> version 6.0.0.  If I remove the part of the configure script that
>> detects GMP to trick it into thinking that it's present, igraph does
>> compile correctly, and it does work correctly (including functions
>> that use GMP).
>>
>> I don't know anything about autoconf and don't understand how it tries
>> to detect GMP ...
>>
>> Am I doing something wrong or is the GMP detection buggy?
>>
>> Szabolcs
>>
>> _______________________________________________
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>
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