In general, the variable LN_S is 'ln -s', however, LN_S changes to 'cp -pR' if configure finds the file system does not support symbolic links.
I was playing with 'ln' for some other reason where I symbolic linked it to '/bin/false'. That revealed the failure for src/backend/Makefile. Greping for 'ln -s' revealed three places it's used. Attaching the patch to fix the same.
From 60b3374de1e4d0fd143c2a7b3bf78893e32579af Mon Sep 17 00:00:00 2001 From: Ashwin Agrawal <aagra...@pivotal.io> Date: Fri, 14 Feb 2020 16:16:37 -0800 Subject: [PATCH v1] Use LN_S instead of "ln -s" in Makefile --- src/backend/Makefile | 2 +- src/interfaces/ecpg/test/Makefile | 2 +- src/makefiles/pgxs.mk | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/src/backend/Makefile b/src/backend/Makefile index 9706a95848..f21a454286 100644 --- a/src/backend/Makefile +++ b/src/backend/Makefile @@ -224,7 +224,7 @@ install-bin: postgres $(POSTGRES_IMP) installdirs $(INSTALL_PROGRAM) postgres$(X) '$(DESTDIR)$(bindir)/postgres$(X)' ifneq ($(PORTNAME), win32) @rm -f '$(DESTDIR)$(bindir)/postmaster$(X)' - ln -s postgres$(X) '$(DESTDIR)$(bindir)/postmaster$(X)' + $(LN_S) postgres$(X) '$(DESTDIR)$(bindir)/postmaster$(X)' else $(INSTALL_PROGRAM) postgres$(X) '$(DESTDIR)$(bindir)/postmaster$(X)' endif diff --git a/src/interfaces/ecpg/test/Makefile b/src/interfaces/ecpg/test/Makefile index be53b7b94d..11d55bde3e 100644 --- a/src/interfaces/ecpg/test/Makefile +++ b/src/interfaces/ecpg/test/Makefile @@ -73,7 +73,7 @@ remaining_files_build := $(patsubst $(srcdir)/%, $(abs_builddir)/%, $(remaining_ all: $(remaining_files_build) $(remaining_files_build): $(abs_builddir)/%: $(srcdir)/% - ln -s $< $@ + $(LN_S) $< $@ endif # Common options for tests. Also pick up anything passed in EXTRA_REGRESS_OPTS diff --git a/src/makefiles/pgxs.mk b/src/makefiles/pgxs.mk index 271e7eaba8..8c7d126593 100644 --- a/src/makefiles/pgxs.mk +++ b/src/makefiles/pgxs.mk @@ -397,7 +397,7 @@ test_files_build := $(patsubst $(srcdir)/%, $(abs_builddir)/%, $(test_files_src) all: $(test_files_build) $(test_files_build): $(abs_builddir)/%: $(srcdir)/% $(MKDIR_P) $(dir $@) - ln -s $< $@ + $(LN_S) $< $@ endif # VPATH endif # REGRESS -- 2.25.0
