To: alpine-user <alpine-user@lists.alpinelinux.org>
From: Riccardo Mottola <riccardo.mottola@libero.it>
Subject: iconv detection issues
Message-ID: <34652592-dd13-dca0-40a1-18eb43101bd9@libero.it>
Date: Tue, 20 Sep 2022 22:12:22 +0200
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Hi,

I am trying to build GNUstep Base on alpine linux, right now on 3.16. I
don't remember if I had issues on previous versions of Alpine Linux, I
don't think so, but also GNUstep might have changed since the last time
I tried.

configure:11518: checking iconv support
configure:11538: gcc -o conftest -g -O2  -I/Local/Library/Headers
-I/Local/Library/Headers -I/System/Library/Headers   -shared-libgcc
-L/Local/Library/Libraries -L/Local/Library/Libraries
-L/System/Library/Libraries conftest.c -lffi  -lz -lrt -ldl  -lpthread
-lz >&5
conftest.c: In function 'main':
conftest.c:235:48: warning: comparison between pointer and integer
  235 | { return iconv_open("UTF-8//TRANSLIT","ASCII") == -1 ? 1 : 0; }
      |                                                ^~
configure:11538: $? = 0
configure:11538: ./conftest
configure:11538: $? = 1

Why does it fail?

On a "standard" linux machine I see:

configure:11518: checking iconv support
configure:11538: gcc -o conftest -g -O2  -I/Local/Library/Headers
-I/Local/Library/Headers -I/System/Library/Headers
-I/Local/Library/Headers -I/usr/lib64/libffi/include   -shared-libgcc
-L/Local/Library/Libraries -L/Local/Library/Libraries
-L/System/Library/Libraries -L/Local/Library/Libraries conftest.c -lffi 
-lbfd -lz -liberty -lrt -ldl  -lpthread -lz >&5
conftest.c: In function 'main':
conftest.c:246:48: warning: comparison between pointer and integer
  246 | { return iconv_open("UTF-8//TRANSLIT","ASCII") == -1 ? 1 : 0; }
      |                                                ^~
configure:11538: $? = 0
configure:11538: ./conftest
configure:11538: $? = 0
configure:11543: result: yes, in libc


So I get the same warning...  but different execution.
what could be specific to alpine linux here?


Riccardo