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+Title: FreeBSD linker error due to undefined libiconv_open
+Author: rodarima
+Created: Wed, 27 Dec 2023 11:45:05 +0000
+State: closed
+
+```
+c++ -I/usr/local/include/libpng16 -I/usr/local/include -I/usr/local/include \
+  -I/usr/local/include/freetype2 -I/usr/local/include/libpng16 -D_THREAD_SAFE -O2 \
+  -pipe -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing \
+  -isystem /usr/local/include -fvisibility-inlines-hidden -I/usr/local/include \
+  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE \
+  -D_REENTRANT -g -O2 -Wall -W -Wno-unused-parameter -fno-rtti \
+  -fno-exceptions    -o dillo dillo.o paths.o tipwin.o  ui.o uicmd.o bw.o cookies.o  \
+  hsts.o auth.o md5.o digest.o  colors.o misc.o history.o  prefs.o prefsparser.o \
+  keys.o  url.o bitvec.o klist.o chain.o  utf8.o timeout.o dialog.o  web.o nav.o \
+  cache.o decode.o  dicache.o capi.o domain.o  css.o cssparser.o styleengine.o \
+  plain.o html.o form.o table.o  bookmark.o dns.o gif.o jpeg.o  png.o \
+  imgbuf.o image.o menu.o  dpiapi.o findbar.o xembed.o ../dlib/libDlib.a \
+  ../dpip/libDpip.a  IO/libDiof.a  ../dw/libDw-widgets.a  ../dw/libDw-fltk.a \
+  ../dw/libDw-core.a  ../lout/liblout.a  -L/usr/local/lib -lpng16 -L/usr/local/lib \
+  -lm -Wl,-rpath,/usr/local/lib -fstack-protector-strong -lfltk -lXrender -lXcursor \
+  -lXfixes -lXext -lXft -lfontconfig -lXinerama -lpthread -lm -lX11 -lz  -lX11 \
+  -lcrypto -lssl
+  ld: error: undefined symbol: libiconv_open
+  >>> referenced by form.cc:1142 (../../../src/form.cc:1142)
+  >>>               form.o:(DilloHtmlForm::buildQueryData(DilloHtmlInput*))
+  >>> referenced by form.cc:1146 (../../../src/form.cc:1146)
+  >>>               form.o:(DilloHtmlForm::buildQueryData(DilloHtmlInput*))
+  
+  ld: error: undefined symbol: libiconv_close
+  >>> referenced by form.cc:1244 (../../../src/form.cc:1244)
+  >>>               form.o:(DilloHtmlForm::buildQueryData(DilloHtmlInput*))
+  
+  ld: error: undefined symbol: libiconv
+  >>> referenced by form.cc:1339 (../../../src/form.cc:1339)
+  >>>               form.o:(DilloHtmlForm::encodeText(void*, Dstr**))
+  c++: error: linker command failed with exit code 1 (use -v to see invocation)
+  *** Error code 1
+  ```
+
+This is likely caused by a the configure script first testing if iconv is provided by the libc, which it is:
+```
+  checking for iconv.h... yes
+  checking for iconv_open in -lc... yes
+```
+
+But then, the `-isystem /usr/local/include` gets added from `fltk-config`, causing `/usr/local/include/iconv.h` to be loaded first which is part of libiconv (instead of `/usr/include/iconv.h`).
+
+This header defines iconv_open() as libiconv_open() instead of the symbol iconv_open() provided by libc. Then, the linker fails as -liconv is not provided as initially it was decided to use the implementation in libc.
+
+--%--
+From: rodarima
+Date: Wed, 27 Dec 2023 14:09:59 +0000
+
+This doesn't make a lot of sense, as the form.o is compiled with a `-I/usr/include` first:
+```
+2023-12-27T12:38:34.1670839Z c++ -DHAVE_CONFIG_H -I. -I..   -I..  -DDILLO_SYSCONF='"/usr/local/etc/dillo/"'  -DDILLO_DOCDIR='"/usr/local/share/doc/dillo/"'  -DCUR_WORKING_DIR='"/home/runner/work/dillo/dillo/src"' -I/usr/include -I/usr/local/include/libpng16 -I/usr/local/include -I/usr/local/include -I/usr/local/include/freetype2 -I/usr/local/include/libpng16 -D_THREAD_SAFE -O2 -pipe -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -isystem /usr/local/include -fvisibility-inlines-hidden -I/usr/local/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT -g -O2 -Wall -W -Wno-unused-parameter -fno-rtti -fno-exceptions -MT form.o -MD -MP -MF .deps/form.Tpo -c -o form.o form.cc
+```
+
+Here is the `tr ' ' '\n'` version:
+
+```
+tr ' ' '\n' < /tmp/kk
+2023-12-27T12:38:34.1670839Z
+c++
+-DHAVE_CONFIG_H
+-I.
+-I..
+
+
+-I..
+
+-DDILLO_SYSCONF='"/usr/local/etc/dillo/"'
+
+-DDILLO_DOCDIR='"/usr/local/share/doc/dillo/"'
+
+-DCUR_WORKING_DIR='"/home/runner/work/dillo/dillo/src"'
+-I/usr/include
+-I/usr/local/include/libpng16
+-I/usr/local/include
+-I/usr/local/include
+-I/usr/local/include/freetype2
+-I/usr/local/include/libpng16
+-D_THREAD_SAFE
+-O2
+-pipe
+-fstack-protector-strong
+-isystem
+/usr/local/include
+-fno-strict-aliasing
+-isystem
+/usr/local/include
+-fvisibility-inlines-hidden
+-I/usr/local/include
+-D_LARGEFILE_SOURCE
+-D_LARGEFILE64_SOURCE
+-D_THREAD_SAFE
+-D_REENTRANT
+-g
+-O2
+-Wall
+-W
+-Wno-unused-parameter
+-fno-rtti
+-fno-exceptions
+-MT
+form.o
+-MD
+-MP
+-MF
+.deps/form.Tpo
+-c
+-o
+form.o
+form.cc
+```
+
+--%--
+From: rodarima
+Date: Wed, 27 Dec 2023 14:23:27 +0000
+
+Ah, this may be the problem, from gcc(1):
+
+```
+           If a standard system include directory, or a directory specified
+           with -isystem, is also specified with -I, the -I option is ignored.
+           The directory is still searched but as a system directory at its
+           normal position in the system include chain.  This is to ensure
+           that GCC's procedure to fix buggy system headers and the ordering
+           for the "#include_next" directive are not inadvertently changed.
+           If you really need to change the search order for system
+           directories, use the -nostdinc and/or -isystem options.
+
+```
+So I'm guessing the first `-I/usr/include/` is ignored as it is already in the system list of gcc, then the `-isystem /usr/local/include` adds it to the beginning of the search list, and that ends up with `/usr/include/local/iconv.h`.
+
+I can verify this by using `CXXFLAGS="-v"`, so it dumps the search path.
+
+--%--
+From: rodarima
+Date: Wed, 27 Dec 2023 14:33:10 +0000
+
+Yeah, that seems to be the case:
+```
+2023-12-27T14:28:38.9303858Z c++ -DHAVE_CONFIG_H -I. -I..   -I..  -DDILLO_SYSCONF='"/usr/local/etc/dillo/"'  -DDILLO_DOCDIR='"/usr/local/share/doc/dillo/"'  -DCUR_WORKING_DIR='"/home/runner/work/dillo/dillo/src"'  -I/usr/local/include/libpng16 -I/usr/local/include -I/usr/local/include -I/usr/local/include/freetype2 -I/usr/local/include/libpng16 -D_THREAD_SAFE -O2 -pipe -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing -isystem /usr/local/include -fvisibility-inlines-hidden -I/usr/local/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT -I/START -I/usr/include -v -I/END -Wall -W -Wno-unused-parameter -fno-rtti -fno-exceptions -MT form.o -MD -MP -MF .deps/form.Tpo -c -o form.o form.cc
+2023-12-27T14:28:38.9336368Z FreeBSD clang version 16.0.6 (https://github.com/llvm/llvm-project.git llvmorg-16.0.6-0-g7cbf1a259152)
+2023-12-27T14:28:38.9337563Z Target: x86_64-unknown-freebsd14.0
+2023-12-27T14:28:38.9338145Z Thread model: posix
+2023-12-27T14:28:38.9338543Z InstalledDir: /usr/bin
+2023-12-27T14:28:38.9340781Z  (in-process)
+2023-12-27T14:28:38.9354557Z  "/usr/bin/c++" -cc1 -triple x86_64-unknown-freebsd14.0 -emit-obj -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name form.cc -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -mllvm -treat-scalable-fixed-error-as-warning -debugger-tuning=gdb -v -fcoverage-compilation-dir=/home/runner/work/dillo/dillo/src -resource-dir /usr/lib/clang/16 -dependency-file .deps/form.Tpo -MT form.o -sys-header-deps -MP -isystem /usr/local/include -isystem /usr/local/include -D HAVE_CONFIG_H -I . -I .. -I .. -D "DILLO_SYSCONF=\"/usr/local/etc/dillo/\"" -D "DILLO_DOCDIR=\"/usr/local/share/doc/dillo/\"" -D "CUR_WORKING_DIR=\"/home/runner/work/dillo/dillo/src\"" -I /usr/local/include/libpng16 -I /usr/local/include -I /usr/local/include -I /usr/local/include/freetype2 -I /usr/local/include/libpng16 -D _THREAD_SAFE -I /usr/local/include -D _LARGEFILE_SOURCE -D _LARGEFILE64_SOURCE -D _THREAD_SAFE -D _REENTRANT -I /START -I /usr/include -I /END -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/lib/clang/16/include -internal-externc-isystem /usr/include -O2 -Wall -W -Wno-unused-parameter -fdeprecated-macro -fdebug-compilation-dir=/home/runner/work/dillo/dillo/src -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o form.o -x c++ form.cc
+2023-12-27T14:28:38.9362257Z clang -cc1 version 16.0.6 based upon LLVM 16.0.6 default target x86_64-unknown-freebsd14.0
+2023-12-27T14:28:38.9362822Z ignoring nonexistent directory "/START"
+2023-12-27T14:28:38.9363183Z ignoring nonexistent directory "/END"
+2023-12-27T14:28:38.9363521Z ignoring duplicate directory ".."
+2023-12-27T14:28:38.9363873Z ignoring duplicate directory "/usr/local/include"
+2023-12-27T14:28:38.9364326Z ignoring duplicate directory "/usr/local/include/libpng16"
+2023-12-27T14:28:38.9364776Z ignoring duplicate directory "/usr/local/include"
+2023-12-27T14:28:38.9365176Z ignoring duplicate directory "/usr/local/include"
+2023-12-27T14:28:38.9365733Z   as it is a non-system directory that duplicates a system directory
+2023-12-27T14:28:38.9366223Z ignoring duplicate directory "/usr/local/include"
+2023-12-27T14:28:38.9366846Z ignoring duplicate directory "/usr/include" <--- here
+2023-12-27T14:28:38.9367378Z   as it is a non-system directory that duplicates a system directory <--- here
+2023-12-27T14:28:38.9367828Z #include "..." search starts here:
+2023-12-27T14:28:38.9368135Z #include <...> search starts here:
+2023-12-27T14:28:38.9368422Z  .
+2023-12-27T14:28:38.9368601Z  ..
+2023-12-27T14:28:38.9368803Z  /usr/local/include/libpng16
+2023-12-27T14:28:38.9369087Z  /usr/local/include/freetype2
+2023-12-27T14:28:38.9369549Z  /usr/local/include
+2023-12-27T14:28:38.9369787Z  /usr/include/c++/v1
+2023-12-27T14:28:38.9370032Z  /usr/lib/clang/16/include
+2023-12-27T14:28:38.9370287Z  /usr/include
+2023-12-27T14:28:38.9370498Z End of search list.
+```
+
+I don't see any easy solution, as including `/usr/local/include` is required for the libraries in ports, so they will always shadow `/usr/include/iconv.h`. Maybe FreeBSD folks can suggest some solution...
+
+--%--
+From: rodarima
+Date: Wed, 27 Dec 2023 17:09:47 +0000
+
+Opened ticket in FreeBSD: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275969
+
+--%--
+From: idatum
+Date: Sun, 05 May 2024 16:04:36 +0000
+
+Seeing the same on NetBSD 10 (Aarch64):
+
+`/work/dillo/build/src/../../src/form.cc:1339: undefined reference to `libiconv'
+/work/dillo/build/src/../../src/form.cc:1339:(.text+0x148): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `libiconv'
+ld: form.o: in function `DilloHtmlForm::buildQueryData(DilloHtmlInput*)':
+/work/dillo/build/src/../../src/form.cc:1244: undefined reference to `libiconv_close'
+/work/dillo/build/src/../../src/form.cc:1244:(.text+0x3c7c): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `libiconv_close'
+ld: /work/dillo/build/src/../../src/form.cc:1142: undefined reference to `libiconv_open'
+/work/dillo/build/src/../../src/form.cc:1142:(.text+0x4190): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `libiconv_open'
+ld: /work/dillo/build/src/../../src/form.cc:1146: undefined reference to `libiconv_open'
+/work/dillo/build/src/../../src/form.cc:1146:(.text+0x4260): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `libiconv_open'`
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