Can't compile PostGIS 3.2 on windows - breaking on protobuf-c

[robe]

I thought it was just something up with my desktop but notice winnie is having the same issue.

  PostGIS is now configured for x86_64-pc-mingw64

 -------------- Compiler Info -------------
  C compiler:           gcc -std=gnu99 -g -O2 -fno-math-errno -fno-signed-zeros
  C++ compiler (Wagyu): gcc -std=c++11 -x c++
  CPPFLAGS:              -IC:/ming64gcc81/projects/geos/rel-3.10w64gcc81/include -IC:/ming64gcc81/projects/proj/rel-7.2.0w64gcc81/include   -IC:/ming64gcc81/projects/protobuf/rel-3.2.0w64gcc81/include   -I/projects/libxml/rel-libxml2-2.9.9w64gcc81/include/libxml2  -IC:/ming64gcc81/projects/json-c/rel-0.12w64gcc81/include/json-c   -IC:/ming64gcc81/projects/pcre/rel-8.33w64gcc81/include   -DNDEBUG
  LDFLAGS:               -lm
  SQL preprocessor:     /mingw64/bin/cpp -traditional-cpp -w -P

 -------------- Additional Info -------------
  Interrupt Tests:   DISABLED use: --with-interrupt-tests to enable

 -------------- Dependencies --------------
  GEOS config:          /projects/geos/rel-3.10w64gcc81/bin/geos-config
  GEOS version:         3.10.0dev
  GDAL config:          /projects/gdal/rel-3.2.0w64gcc81/bin/gdal-config
  GDAL version:         3.2.0
  PostgreSQL config:    /projects/postgresql/rel/pg14w64gcc81/bin/pg_config
  PostgreSQL version:   PostgreSQL 14beta1
  PROJ4 version:        72
  Libxml2 config:       /projects/libxml/rel-libxml2-2.9.9w64gcc81/bin/xml2-config
  Libxml2 version:      2.9.9
  JSON-C support:       yes
  protobuf support:     yes
  protobuf-c version:   1002001
  PCRE support:         yes
  Perl:                 /usr/bin/perl

 --------------- Extensions ---------------
  PostGIS Raster:                     enabled
  PostGIS Topology:                   enabled
  SFCGAL support:                     disabled
  Address Standardizer support:       enabled

lwgeom_in_gml.o lwgeom_in_kml.o lwgeom_in_geohash.o lwgeom_in_geojson.o lwgeom_in_encoded_polyline.o lwgeom_triggers.o lwgeom_dump.o lwgeom_dumppoints.o lwgeom_functions_lrs.o lwgeom_functions_temporal.o lwgeom_rectree.o long_xact.o lwgeom_sqlmm.o lwgeom_rtree.o lwgeom_transform.o lwgeom_window.o gserialized_typmod.o gserialized_gist_2d.o gserialized_gist_nd.o gserialized_supportfn.o gserialized_spgist_2d.o gserialized_spgist_3d.o gserialized_spgist_nd.o brin_2d.o brin_nd.o brin_common.o gserialized_estimate.o geography_inout.o geography_btree.o geography_centroid.o geography_measurement.o geography_measurement_trees.o geometry_inout.o postgis_libprotobuf.o vector_tile.pb-c.o geobuf.pb-c.o mvt.o lwgeom_out_mvt.o geobuf.o lwgeom_out_geobuf.o lwgeom_out_geojson.o postgis_legacy.o -Wl,--enable-auto-import -L/projects/postgresql/rel/pg13w64gcc81/lib -L/projects/rel-libiconv-1.15w64gcc81/lib -L/projects/zlib/rel-zlib-1.2.11w64gcc81/lib -lm  ../deps/wagyu/libwagyu.la -lstdc++ ../libpgcommon/libpgcommon.a ../liblwgeom/.libs/liblwgeom.a  -LE:/jenkins/geos/rel-3.9w64gcc81/lib -lgeos_c -LE:/jenkins/proj/rel-7.1.1w64gcc81/lib -lproj   -LE:/jenkins/json-c/rel-0.12w64gcc81/lib -ljson-c   -lprotobuf-c -L/projects/libxml/rel-libxml2-2.9.9w64gcc81/lib -lxml2 -liconv -lws2_32 -L/projects/CGAL/rel-sfcgal-1.3.9w64gcc81/lib -lSFCGAL -Wl,--exclude-libs,ALL -Wl,--enable-auto-import -L/projects/postgresql/rel/pg13w64gcc81/lib -L/projects/rel-libiconv-1.15w64gcc81/lib -L/projects/zlib/rel-zlib-1.2.11w64gcc81/lib -lm -static-libstdc++ -lstdc++ -Wl,-Bdynamic -lm -LE:/jenkins/postgresql/rel/pg13w64gcc81/lib -lpostgres -lpgcommon -lpgport -lxml2 -lz -lws2_32 -lm  -lws2_32 -Wl,--export-all-symbols -Wl,--out-implib=libpostgis-3.2.a
C:/ming64gcc81/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lprotobuf-c
collect2.exe: error: ld returned 1 exit status
make[1]: *** [E:/jenkins/postgresql/rel/pg13w64gcc81/lib/pgxs/src/makefiles/../../src/Makefile.shlib:370: postgis-3.2.dll] Error 1
make[1]: Leaving directory '/projects/postgis/branches/3.2/postgis'
make: *** [GNUmakefile:22: all] Error 1

e:\jenkins\postgis>exit 2 
Build step 'Execute Windows batch command' marked build as failure
An attempt to send an e-mail to empty list of recipients, ignored.

Looks like winnie' has been broken for a week or so. I haven't tried compiling in past week.

[robe]

I'm guessing this might be the commit at fault.

[6eeee128815/git] by Sandro Santilli Fix PROTOBUF_LDFLAGS in absence of pkg-config

[Regina Obe <lr@…>]

In 86a8a59/git:

Partially revert #4964 which broke mingw64 building. Closes #4977