[PATCH] makefiles: support building shared libs on Darwin

On Darwin (macOS), the flags needed to create a shared
library are different. Moreover, the extension is .dylib
and the version portion of the soname is inserted between
the library name and the libext, e.g. lifoo.1.2.3.dylib.

Signed-off-by: Caleb Xu <calebcenter@live.com>
---
makefiles/Makefile.clang | 7 ++++++-
makefiles/Makefile.gcc | 6 +++++-
makefiles/Makefile.tools | 6 +++++-
makefiles/Makefile.top | 14 +++++++++++---
4 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/makefiles/Makefile.clang b/makefiles/Makefile.clang
index 50f8a82..bcd14e3 100644
--- a/makefiles/Makefile.clang
+++ b/makefiles/Makefile.clang
@@ -21,7 +21,12 @@ CXXSHR := -fPIC

LDDBG := -g
# Reevaluation is required here
-LDSHR = -shared -Wl,-soname,$(SONAME)
+ifeq ($(findstring darwin,$(HOST)),darwin)
+ LDSHR = -dynamiclib -install_name $(SONAME)
+else
+ LDSHR = -shared -Wl,-soname,$(SONAME)
+endif
+

ARFLG := cru

diff --git a/makefiles/Makefile.gcc b/makefiles/Makefile.gcc
index b5119ac..4a9dff7 100644
--- a/makefiles/Makefile.gcc
+++ b/makefiles/Makefile.gcc
@@ -20,7 +20,11 @@ CXXSHR := -fPIC

LDDBG := -g
# Reevaluation is required here
-LDSHR = -shared -Wl,-soname,$(SONAME)
+ifeq ($(findstring darwin,$(HOST)),darwin)
+ LDSHR = -dynamiclib -install_name $(SONAME)
+else
+ LDSHR = -shared -Wl,-soname,$(SONAME)
+endif

ARFLG := cru

diff --git a/makefiles/Makefile.tools b/makefiles/Makefile.tools
index 112e7f8..e5504e7 100644
--- a/makefiles/Makefile.tools
+++ b/makefiles/Makefile.tools
@@ -478,7 +478,11 @@ LDFLAGS := $(LDFLAGS) $(OPTLDFLAGS)
ifeq ($(COMPONENT_TYPE),lib-static)
LIBEXT ?= .a
else
- LIBEXT ?= .so
+ ifeq ($(findstring darwin,$(HOST)),darwin)
+ LIBEXT ?= .dylib
+ else
+ LIBEXT ?= .so
+ endif
endif

# If we're building a shared library, modify the flags appropriately
diff --git a/makefiles/Makefile.top b/makefiles/Makefile.top
index caac166..0b0fe22 100644
--- a/makefiles/Makefile.top
+++ b/makefiles/Makefile.top
@@ -189,9 +189,17 @@ endif
# Determine the output filename
ifeq ($(findstring lib,$(COMPONENT_TYPE)),lib)
ifeq ($(findstring lib-shared,$(COMPONENT_TYPE)),lib-shared)
- SHAREDLIBNAME := lib$(COMPONENT)$(LIBEXT)
- SONAME := $(SHAREDLIBNAME).$(major-version)
- OUTPUT := $(BUILDDIR)/$(SHAREDLIBNAME).$(COMPONENT_VERSION)
+ ifeq ($(findstring darwin,$(HOST)),darwin)
+ # In macOS, shared lib filenames are of the form libfoo.dylib,
+ # libfoo.1.dylib, or libfoo.1.2.3.dylib
+ SONAME := lib$(COMPONENT).$(major-version)$(LIBEXT)
+ SHAREDLIBNAME := lib$(COMPONENT)$(LIBEXT)
+ OUTPUT := $(BUILDDIR)/lib$(COMPONENT).$(COMPONENT_VERSION)$(LIBEXT)
+ else
+ SHAREDLIBNAME := lib$(COMPONENT)$(LIBEXT)
+ SONAME := $(SHAREDLIBNAME).$(major-version)
+ OUTPUT := $(BUILDDIR)/$(SHAREDLIBNAME).$(COMPONENT_VERSION)
+ endif
else
OUTPUT := $(BUILDDIR)/lib$(COMPONENT)$(LIBEXT)
endif
--
2.41.0
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