I am trying to build gdal 2.3.2 from source, using the official Arch Linux package (http://archlinux.org/packages/community/x86_64/gdal/) as a recipe, but changing `./configure`-options.

When the build process reaches `frmts/pdf` or `frmts/openjpeg`, the build fails on `make plugin`, missing a definition of the variable `LD_SHARED`.

Example: Executing `make plugin` in `frmts/openjpeg`, prints the following to the terminal:

```
/bin/sh /home/felics/tmp/install/build/gdal/src/gdal-2.3.2/libtool --mode=compile --silent --tag=CXX g++ -DHAVE_AVX_AT_COMPILE_TIME -DHAVE_SSSE3_AT_COMPILE_TIME -DHAVE_SSE_AT_COMPILE_TIME -g -O2 -Wall -Wextra -Winit-self -Wunused-parameter -Wformat -Werror=format-security -Wno-format-nonliteral -Wlogical-op -Wshadow -Werror=vla -Wdate-time -Wnull-dereference -Wduplicated-cond -Wextra-semi -Wfloat-conversion -Wmissing-declarations -Wnon-virtual-dtor -Woverloaded-virtual -fno-operator-names -Wzero-as-null-pointer-constant -Wsuggest-override -Wimplicit-fallthrough -I.. -DGNM_ENABLED -I/home/felics/tmp/install/build/gdal/src/gdal-2.3.2/port -I/usr/include/webp/include -I/usr/include/ -I/usr/include//include -I/usr/include/openjpeg-2.3 -I/usr/include/jasper -I/usr/include/jasper/include -I/usr/include -I/usr/include -I/usr/include/include -I/usr/include -I/usr/include/include -I/usr/include -I/usr/include/include -I/usr/include -I/usr/include/include -DGDAL_COMPILATION -DHAVE_XERCES -I/usr/include -I/usr/include/xercesc -I/home/felics/tmp/install/build/gdal/src/gdal-2.3.2/port -I/usr/include/webp/include -I/usr/include/ -I/usr/include//include -I/usr/include/openjpeg-2.3 -I/usr/include/jasper -I/usr/include/jasper/include -I/usr/include -I/usr/include -I/usr/include/include -I/usr/include -I/usr/include/include -I/usr/include -I/usr/include/include -I/usr/include -I/usr/include/include -DGDAL_COMPILATION -c -o openjpegdataset.o openjpegdataset.cpp
openjpegdataset.o -L/usr/lib -lgdal -lcrypto -lcryptopp -larmadillo -lproj -lfreexl -L/usr/lib -lgeos_c -L/usr/include/webp/lib -lwebp -L/usr/include/ -L/usr/include//lib -lodbc -lodbcinst -lexpat -lxerces-c -lpthread -lopenjp2 -L/usr/include/jasper -L/usr/include/jasper/lib -ljasper -L/usr/lib -lnetcdf -lhdf5 -L/opt/hdf4/lib -lmfhdf -ldf -L/usr/include -L/usr/include/lib -lgif -lCharLS -L/usr/include -L/usr/include/lib -ljpeg -lgeotiff -ltiff -lpng -L/usr/include -L/usr/include/lib -lcfitsio -L/opt/grass/lib -lgrass_vector -lgrass_dig2 -lgrass_dgl -lgrass_rtree -lgrass_linkm -lgrass_dbmiclient -lgrass_dbmibase -lgrass_raster -lgrass_imagery -lgrass_gproj -lgrass_gmath -lgrass_gis -lgrass_datetime -L/usr/lib -lpq -lzstd -llzma -lz -L/usr/include -L/usr/include/lib -lpthread -lm -lrt -ldl -lspatialite -lsqlite3 -lrasterlite2 -lsqlite3 -lpcre -lcurl -lNCSEcw -lNCSEcwC -lNCSCnet -lNCSUtil -lOpenCL -lxml2 -lz -llzma -licui18n -licuuc -licudata -lm -ldl -L/usr/lib/ -lmariadb -lz -ldl -lm -lpthread -lssl -lcrypto -L/usr/lib -lkea -L/usr/lib -lhdf5_cpp -lhdf5 -lsz -lz -ldl -lm \
-o gdal_JP2OpenJPEG.so
make: openjpegdataset.o: Command not found
make: *** [GNUmakefile:20: gdal_JP2OpenJPEG.so] Error 127
```

The corresponding lines of the `GNUmakefile`s in these directories are:

For `frmts/pdf/GNUmakefile`:

```
include ../../GDALmake.opt

OBJ = pdfdataset.o pdfio.o pdfobject.o pdfcreatecopy.o ogrpdflayer.o pdfwritabledataset.o pdfreadvectors.o

[...]

plugin: $(PLUGIN_DL)

$(PLUGIN_DL): $(OBJ)
$(LD_SHARED) $(OBJ) ../../ogr/ogrsf_frmts/o/ogrmemdatasource.o ../../ogr/ogrsf_frmts/o/ogrmemdriver.o ../../ogr/ogrsf_frmts/o/ogrmemlayer.o $(LDFLAGS) $(CONFIG_LIBS) -o $(PLUGIN_DL) $(PDFIUM_PLUGIN_LIB) $(POPPLER_PLUGIN_LIB) $(PODOFO_PLUGIN_LIB)
```
(The full `frmts/pdf/GNUmakefile` I have uploaded there: http://ix.io/1GvT)

`frmts/openjpeg/GNUmakefile` is:

```

include ../../GDALmake.opt

OBJ = openjpegdataset.o

CPPFLAGS := -I.. $(CPPFLAGS)

default: $(OBJ:.o=.$(OBJ_EXT))

clean:
rm -f $(OBJ) $(O_OBJ) *.so *.lo

install-obj: $(O_OBJ:.o=.$(OBJ_EXT))

PLUGIN_SO = gdal_JP2OpenJPEG.so

plugin: $(PLUGIN_SO)

$(PLUGIN_SO): $(OBJ)
$(LD_SHARED) $(LNK_FLAGS) $(OBJ) $(CONFIG_LIBS_INS) $(LIBS) \
-o $(PLUGIN_SO)
```

The `GDALmake.opt`, which is included by the `frmts/*/GNUmakefile`s, contains a statement
```
LD_SHARED =
```
and does not try to set `LD_SHARED` somewhere else. The complete `GDALmake.opt` I have uploaded there: `http://ix.io/1GvU`


It seems that `LD_SHARED` is not set, and so `make plugin` tries to execute the command `$(OBJ) ../../ogr/ogrsf_frmts/o/ogrmemdatasource.o ../../ogr/ogrsf_frmts/o/ogrmemdriver.o ../../ogr/ogrsf_frmts/o/ogrmemlayer.o $(LDFLAGS) $(CONFIG_LIBS) -o $(PLUGIN_DL) $(PDFIUM_PLUGIN_LIB) $(POPPLER_PLUGIN_LIB) $(PODOFO_PLUGIN_LIB)`, which obviously will fail, since the first element in `$(OBJ)` is not an executable.


Here more detailed information about how I go about:

I am working on Arch/ Artix Linux.

I use the following steps to build gdal, in this order (taken from the official Arch Linux package's `PKGBUILD` http://archlinux.org/packages/community/x86_64/gdal/):

0. For a clean environment, I set
`CFLAGS=''`
`CXXFLAGS=''`
`LDFLAGS=''`
1. downloading and extracting https://download.osgeo.org/gdal/2.3.2/gdal-2.3.2.tar.xz
2. downloading patches:
* `gdal-poppler-0.69.0.patch`: https://github.com/OSGeo/gdal/commit/69e0701253.patch
* `gdal-perl-vendor.patch`: http://ix.io/1GvP
* `gdal-poppler-0.75.patch`: http://ix.io/1GvQ
3. Applying fixes and patches, in this order, commands carried out from within the source directory of extraction:
* Fix build with poppler >= 0.69.0
`patch -Np2 -i ../gdal-poppler-0.69.0.patch`
* Fix build with poppler 0.72
`find frmts/pdf -type f | xargs sed -e 's|GBool|bool|g' -e 's|gFalse|false|g' -e 's|getCString|c_str|g' -i`
* Fix build with poppler 0.73
`sed -e 's|#include <goo/gtypes.h>|typedef unsigned char Guchar;|' -i frmts/pdf/pdfsdk_headers.h`
* Fix build with poppler 0.75
`patch -p2 -i ../gdal-poppler-0.75.patch`
* Fix mandir
`sed -i "s|^mandir=.*|mandir='\${prefix}/share/man'|" configure`
* Fix Perl bindings installation path
`patch -Np1 -i ../gdal-perl-vendor.patch`
(Up to here, I have changed nothing from the official Arch Linux package.)
4. Configuring the build:
```
./configure --prefix=/usr --with-netcdf --with-libtiff --with-sqlite3 --with-geotiff \
--with-mysql --with-curl --with-hdf5 --with-perl --with-geos \
--with-png --with-poppler --with-spatialite --with-openjpeg \
--enable-pdf-plugin \
--with-libz='/usr/include' \
--with-liblzma \
--with-pg='/usr/bin/pg_config' \
--with-zstd=yes \
--with-grass='/opt/grass' --with-libgrass='/opt/grass/include/grass' \
--with-cfitsio='/usr/include' \
--with-pcraster=internal \
--with-dds=no \
--with-gta=no \
--with-pcidsk=internal \
--with-jpeg='/usr/include' --with-charls \
--with-jpeg12 \
--with-gif='/usr/include' \
--with-ogdi=no \
--with-fme=no \
--with-sosi=no \
--with-mongocxx=no \
--with-hdf4='/opt/hdf4' \
--with-kea=yes \
--with-jasper='/usr/include/jasper' \
--with-fgdb=no \
--with-ecw=yes \
--with-kakadu=no \
--with-mrsid=no --with-jp2mrsid=no --with-mrsid_lidar=no \
--with-msg=no \
--with-bsb \
--without-oci \
--with-grib \
--with-gnm \
--with-mysql='/usr/bin/mysql_config' \
--with-ingres=no \
--with-xerces=yes \
--with-expat=yes \
--with-libkml=no \
--with-odbc='/usr/include/' \
--with-dods-root=no \
--with-xml2='/usr/bin/xml2-config' \
--with-rasterlite2=yes \
--with-pcre \
--without-teigha --with-teigha-plt \
--with-idb \
--without-sde \
--with-epsilon=no \
--with-webp='/usr/include/webp' \
--with-sfcgal=no \
--with-qhull='/usr/include' \
--with-opencl \
--with-freexl=yes \
--with-libjson-c=internal \
--with-pam \
--with-podofo=yes \
--with-pdfium=no \
--with-proj --with-proj5-api=yes \
--with-perl \
--without-php \
--with-python \
--with-java=no \
--without-mdb \
--without-rasdaman \
--with-armadillo=yes \
--with-cryptopp=yes \
--with-crypto=yes \
--with-mrf \
--without-null 2>&1 | tee configure.log
```
The output of this configure step (combined `stdout` and `stderr`) is attached as `configure.log`.
Additionally, `./configure` createad a `config.log`. It is also attached.
5. Trying to compile:
`make`
will eventually fail. Errorneous terminal output from `frmts/openjpeg` I have given above.