Hi, In src/test/example, the implicit make rules produce errors:
make -C ../../../src/backend generated-headers make[1]: Entering directory '/home/ddong/postgresql/bld/src/backend' make -C catalog distprep generated-header-symlinks make[2]: Entering directory '/home/ddong/postgresql/bld/src/backend/catalog' make[2]: Nothing to be done for 'distprep'. make[2]: Nothing to be done for 'generated-header-symlinks'. make[2]: Leaving directory '/home/ddong/postgresql/bld/src/backend/catalog' make -C utils distprep generated-header-symlinks make[2]: Entering directory '/home/ddong/postgresql/bld/src/backend/utils' make[2]: Nothing to be done for 'distprep'. make[2]: Nothing to be done for 'generated-header-symlinks'. make[2]: Leaving directory '/home/ddong/postgresql/bld/src/backend/utils' make[1]: Leaving directory '/home/ddong/postgresql/bld/src/backend' gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -Wno-format-truncation -O2 -I/home/ddong/postgresql/bld/../src/interfaces/libpq -I../../../src/include -I/home/ddong/postgresql/bld/../src/include -D_GNU_SOURCE -c -o testlibpq.o /home/ddong/postgresql/bld/../src/test/examples/testlibpq.c gcc -L../../../src/port -L../../../src/common -L../../../src/common -lpgcommon -L../../../src/port -lpgport -L../../../src/interfaces/libpq -lpq -Wl,--as-needed -Wl,-rpath,'/usr/local/pgsql/lib',--enable-new-dtags testlibpq.o -o testlibpq testlibpq.o: In function `exit_nicely': testlibpq.c:(.text.unlikely+0x5): undefined reference to `PQfinish' testlibpq.o: In function `main': testlibpq.c:(.text.startup+0x22): undefined reference to `PQconnectdb' testlibpq.c:(.text.startup+0x2d): undefined reference to `PQstatus' testlibpq.c:(.text.startup+0x44): undefined reference to `PQexec’ … I think the -lpq flag does not have any effects in the middle of the arguments. It works if move the flag to the end: gcc -L../../../src/port -L../../../src/common -L../../../src/common -lpgcommon -L../../../src/port -lpgport -L../../../src/interfaces/libpq -Wl,--as-needed -Wl,-rpath,'/usr/local/pgsql/lib',--enable-new-dtags testlibpq.o -o testlibpq -lpq So I added an explicit rule to rearrange the flags: gcc testlibpq.o -o testlibpq -L../../../src/port -L../../../src/common -L../../../src/common -lpgcommon -L../../../src/port -lpgport -L../../../src/interfaces/libpq -lpq -Wl,--as-needed -Wl,-rpath,'/usr/local/pgsql/lib',--enable-new-dtags Then the make command works as expected. This is my first time writing a patch. Please let me know what you think! Thank you, Happy new year! Donald Dong