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Add environment variable to disable building shared library

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Environment variable DISABLE_SHARED (following convention of --disable-shared
of ./configure script) disables building of shared library and shared lib
symlink. It makes life of downstream maintainer easier when maintaining package
for environment that supports only static libraries.

See https://github.com/NixOS/nixpkgs/pull/144438
This commit is contained in:
Dmitry Bogatov 2021-11-03 17:57:36 -04:00 committed by Eric Biggers
parent 047aa84e01
commit ee4d18872b
1 changed files with 11 additions and 1 deletions
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12
Makefile
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@ -6,6 +6,9 @@
# Define USE_SHARED_LIB to link the binaries to the shared library version of
# libdeflate rather than to the static library version.
#
# Define DISABLE_SHARED to disable building and installing of shared library.
# Defining this variable undefines USE_SHARED_LIB.
#
# Define DECOMPRESSION_ONLY to omit all compression code, building a
# decompression-only library. If doing this, you must also build a specific
# library target such as 'libdeflate.a', as the programs will no longer compile.
@ -142,6 +145,7 @@ endif
.build-config: FORCE
@flags=$$( \
echo 'USE_SHARED_LIB=$(USE_SHARED_LIB)'; \
echo 'DISABLE_SHARED=$(DISABLE_SHARED)'; \
echo 'DECOMPRESSION_ONLY=$(DECOMPRESSION_ONLY)'; \
echo 'DISABLE_GZIP=$(DISABLE_GZIP)'; \
echo 'DISABLE_ZLIB=$(DISABLE_ZLIB)'; \
@ -216,7 +220,11 @@ $(SHARED_LIB):$(SHARED_LIB_OBJ)
$(QUIET_CCLD) $(CC) -o $@ $(LDFLAGS) $(LIB_CFLAGS) \
$(SHARED_LIB_LDFLAGS) -shared $+
ifdef DISABLE_SHARED
undefine SHARED_LIB_SYMLINK
else
DEFAULT_TARGETS += $(SHARED_LIB)
endif
ifdef SHARED_LIB_SYMLINK
# Create the symlink libdeflate.so => libdeflate.so.$SOVERSION
@ -305,7 +313,9 @@ all:$(DEFAULT_TARGETS)
install:all
install -d $(DESTDIR)$(LIBDIR) $(DESTDIR)$(INCDIR) $(DESTDIR)$(BINDIR)
install -m644 $(STATIC_LIB) $(DESTDIR)$(LIBDIR)
install -m755 $(SHARED_LIB) $(DESTDIR)$(LIBDIR)
if [ -z "$(DISABLE_SHARED)" ]; then \
install -m755 $(SHARED_LIB) $(DESTDIR)$(LIBDIR); \
fi
install -m644 libdeflate.h $(DESTDIR)$(INCDIR)
install -m755 gzip$(PROG_SUFFIX) \
$(DESTDIR)$(BINDIR)/libdeflate-gzip$(PROG_SUFFIX)