Date: Sun, 5 Jul 2015 21:11:55 +0000 From: Marcin Cieslak <saper@saper.info> To: ports@FreeBSD.org, tijl@FreeBSD.org, bug-gnulib@gnu.org Subject: Proper way to get base <iconv.h> with autoconf? Message-ID: <alpine.BSF.2.11.1507052035240.7491@z.fncre.vasb>
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[X-posted, replies set to ports@FreeBSD.org] Hello, I have managed to upstream few things needed to make mono work on FreeBSD without local patches. Now I am stuck with the iconv detection code. Mono (or it's dumbled-down glib called eglib) need libiconv for two things - charset conversion: https://github.com/mono/mono/blob/master/eglib/src/giconv.c and getting default charset information https://github.com/mono/mono/blob/master/eglib/src/gunicode.c#L223 The latter can be solved by using "nl_langinfo (CODESET);" and avoiding the need to link libcharset.so Mono uses "standard" iconv.m4 autoconf test, version 11 https://github.com/mono/mono/blob/master/eglib/m4/iconv.m4 which is developed in the gettext and gnulib (The GNU portability library): http://git.savannah.gnu.org/cgit/gnulib.git/log/m4/iconv.m4 http://git.savannah.gnu.org/cgit/gettext.git/log/gettext-runtime/m4/iconv.m4 Whenever -I/usr/local/include is added to CPPFLAGS for some reason (some other library, or jest using /usr/local as default prefix) the configure script fails to use base header and libc support and needs using GNU iconv as a dependency; because this simple test fails: configure:13910: checking for iconv configure:13934: cc -o conftest -g -O2 -g -D_GNU_SOURCE -I/usr/local/include conftest.c >&5 /tmp/conftest-ee6d62.o: In function `main': /home/saper/sw/mono/eglib/conftest.c:42: undefined reference to `libiconv_open' /home/saper/sw/mono/eglib/conftest.c:43: undefined reference to `libiconv' /home/saper/sw/mono/eglib/conftest.c:44: undefined reference to `libiconv_close' cc: error: linker command failed with exit code 1 (use -v to see invocation) configure:13934: $? = 1 configure: failed program was: | /* confdefs.h */ | #define PACKAGE_NAME "eglib" | #define PACKAGE_TARNAME "eglib" | #define PACKAGE_VERSION "0.3" | #define PACKAGE_STRING "eglib 0.3" | #define PACKAGE_BUGREPORT "http://bugzilla.xamarin.com/enter_bug.cgi?classification=Mono" --snip-- | /* end confdefs.h. */ | | #include <stdlib.h> | #include <iconv.h> | | int | main () | { | iconv_t cd = iconv_open("",""); | iconv(cd,NULL,NULL,NULL,NULL); | iconv_close(cd); | ; | return 0; | } configure:13958: cc -o conftest -g -O2 -g -D_GNU_SOURCE -I/usr/local/include conftest.c /usr/local/lib/libiconv.so -Wl,-rpath -Wl,/usr/local/lib >&5 configure:13958: $? = 0 configure:13968: result: yes The <iconv.h> test fails because /usr/local/include/iconv.h redefines iconv_open (and friends) to libiconv_open Any ideas how to fix/improve the iconv.m4 detection code - to use the FreeBSD's base <iconv.h> and not require a library? ~Marcin
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