Fix version in libtiff-4.pc.in, and CMake build: Add requirements to pc file

CMakeLists.txt

@@ -124,8 +124,6 @@ include(WindowsSupport)
 # Orthogonal features
 include(LibraryFeatures)
 
-# pkg-config support
-include(PkgConfig)
 
 # math.h/libm portability
 find_package(CMath REQUIRED)
@@ -144,6 +142,8 @@ add_subdirectory(build)
 add_subdirectory(man)
 add_subdirectory(html)
 
+# pkg-config support
+include(PkgConfig)
 
 message(STATUS "")
 message(STATUS "Libtiff is now configured for ${CMAKE_SYSTEM}")

cmake/PkgConfig.cmake

@@ -23,11 +23,34 @@
 # LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 # OF THIS SOFTWARE.
 
+# Post-process lib files into linker flags
+function(set_libs_private out_var)
+    set(tiff_libs_private "")
+    foreach(lib IN LISTS ARGN)
+        get_filename_component(name "${lib}" NAME)
+        foreach(prefix IN LISTS CMAKE_FIND_LIBRARY_PREFIXES)
+            if(name MATCHES "^${prefix}")
+                string(REGEX REPLACE "^${prefix}" "" name "${name}")
+                break()
+            endif()
+        endforeach()
+        foreach(suffix IN LISTS CMAKE_FIND_LIBRARY_SUFFIXES)
+            if(name MATCHES "${suffix}$")
+                string(REGEX REPLACE "${suffix}$" "" name "${name}")
+                break()
+            endif()
+        endforeach()
+        string(APPEND tiff_libs_private " -l${name}")
+    endforeach()
+    set(${out_var} "${tiff_libs_private}" PARENT_SCOPE)
+endfunction()
+
 # Generate pkg-config file
 set(prefix "${CMAKE_INSTALL_PREFIX}")
 set(exec_prefix "${CMAKE_INSTALL_PREFIX}")
 set(libdir "${CMAKE_INSTALL_FULL_LIBDIR}")
 set(includedir "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
+set_libs_private(tiff_libs_private ${tiff_libs_private_list})
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libtiff-4.pc.in
         ${CMAKE_CURRENT_BINARY_DIR}/libtiff-4.pc)
 

configure.ac

@@ -160,6 +160,9 @@ AM_SILENT_RULES
 tiff_libs_private=
 AC_SUBST(tiff_libs_private)
 
+tiff_requires_private=
+AC_SUBST(tiff_requires_private)
+
 dnl We don't need to add math library to all targets
 case "${host_os}" in
     cygwin* | mingw32* | beos* | darwin*)

libtiff-4.pc.in

@@ -5,7 +5,8 @@ includedir=@includedir@
 
 Name: libtiff
 Description:  Tag Image File Format (TIFF) library.
-Version: @VERSION@
+Version: @LIBTIFF_MAJOR_VERSION@.@LIBTIFF_MINOR_VERSION@.@LIBTIFF_MICRO_VERSION@
 Libs: -L${libdir} -ltiff
 Libs.private: @tiff_libs_private@
 Cflags: -I${includedir}
+Requires.private: @tiff_requires_private@

libtiff/CMakeLists.txt

@@ -106,14 +106,20 @@ target_include_directories(tiff
         ${TIFF_INCLUDES}
 )
 
+set(tiff_libs_private_list "") # cmake list
+set(tiff_requires_private "") # cmake string
+
 if(ZIP_SUPPORT)
   target_link_libraries(tiff PRIVATE ZLIB::ZLIB)
+  string(APPEND tiff_requires_private " zlib")
 endif()
 if(ZIP_SUPPORT AND LIBDEFLATE_SUPPORT)
   target_link_libraries(tiff PRIVATE Deflate::Deflate)
+  list(APPEND tiff_libs_private_list "${Deflate_LIBRARY}")
 endif()
 if(JPEG_SUPPORT)
   target_link_libraries(tiff PRIVATE JPEG::JPEG)
+  string(APPEND tiff_requires_private " libjpeg")
   if(JPEG_DUAL_MODE_8_12)
     target_include_directories(tiff PRIVATE ${JPEG12_INCLUDE_DIR})
     target_link_libraries(tiff PRIVATE ${JPEG12_LIBRARIES})
@@ -121,20 +127,31 @@ if(JPEG_SUPPORT)
 endif()
 if(JBIG_SUPPORT)
   target_link_libraries(tiff PRIVATE JBIG::JBIG)
+  list(APPEND tiff_libs_private_list "${JBIG_LIBRARY}")
 endif()
 if(LERC_SUPPORT)
-    target_link_libraries(tiff PRIVATE LERC::LERC)
+  target_link_libraries(tiff PRIVATE LERC::LERC)
+  list(APPEND tiff_libs_private_list "${LERC_LIBRARY}")
 endif()
 if(LZMA_SUPPORT)
-    target_link_libraries(tiff PRIVATE LibLZMA::LibLZMA)
+  target_link_libraries(tiff PRIVATE LibLZMA::LibLZMA)
+  string(APPEND tiff_requires_private " liblzma")
 endif()
 if(ZSTD_SUPPORT)
   target_link_libraries(tiff PRIVATE ZSTD::ZSTD)
+  string(APPEND tiff_requires_private " libzstd")
 endif()
 if(WEBP_SUPPORT)
   target_link_libraries(tiff PRIVATE WebP::WebP)
+  string(APPEND tiff_requires_private " libwebp")
 endif()
 target_link_libraries(tiff PRIVATE CMath::CMath)
+if(CMath_LIBRARY)
+  list(APPEND tiff_libs_private_list "${CMath_LIBRARY}")
+endif()
+
+set(tiff_libs_private_list "${tiff_libs_private_list}" PARENT_SCOPE)
+set(tiff_requires_private "${tiff_requires_private}" PARENT_SCOPE)
 
 set_target_properties(tiff PROPERTIES SOVERSION ${SO_COMPATVERSION})
 if(NOT CYGWIN)