cmake: set PCRE2POSIX_CFLAG in pcre2-config and pkg-config (#311)

Since a8a875e (windows: integrate visibility attributes without
conflicts (#249), 2023-05-16) setting CFLAGS when using a DLL is
recommended, but the pcre2-config and pkgconfig files generated
by cmake didn't include that logic, unlike the ones generated by
the autotools.

While at it, refactor the code so it will be more modern and it
wouldn't unnecessarily install the pcre2posix pkgconfig if not
needed and make sure the generated pcre2-config uses UNIX EOL.

CMakeLists.txt

@@ -573,46 +573,6 @@ IF(WIN32)
   SET(CMAKE_DEBUG_POSTFIX "d")
 ENDIF(WIN32)
 
-# Generate pkg-config files
-
-SET(PACKAGE_VERSION "${PCRE2_MAJOR}.${PCRE2_MINOR}")
-SET(prefix ${CMAKE_INSTALL_PREFIX})
-
-SET(exec_prefix "\${prefix}")
-SET(libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
-SET(includedir "\${prefix}/include")
-IF(WIN32 AND (CMAKE_BUILD_TYPE MATCHES Debug))
-  SET(LIB_POSTFIX ${CMAKE_DEBUG_POSTFIX})
-ENDIF()
-CONFIGURE_FILE(libpcre2-posix.pc.in libpcre2-posix.pc @ONLY)
-SET(pkg_config_files ${pkg_config_files} "${CMAKE_CURRENT_BINARY_DIR}/libpcre2-posix.pc")
-
-IF(PCRE2_BUILD_PCRE2_8)
-  CONFIGURE_FILE(libpcre2-8.pc.in libpcre2-8.pc @ONLY)
-  SET(pkg_config_files ${pkg_config_files} "${CMAKE_CURRENT_BINARY_DIR}/libpcre2-8.pc")
-  SET(enable_pcre2_8 "yes")
-ELSE()
-  SET(enable_pcre2_8 "no")
-ENDIF()
-
-IF(PCRE2_BUILD_PCRE2_16)
-  CONFIGURE_FILE(libpcre2-16.pc.in libpcre2-16.pc @ONLY)
-  SET(pkg_config_files ${pkg_config_files} "${CMAKE_CURRENT_BINARY_DIR}/libpcre2-16.pc")
-  SET(enable_pcre2_16 "yes")
-ELSE()
-  SET(enable_pcre2_16 "no")
-ENDIF()
-
-IF(PCRE2_BUILD_PCRE2_32)
-  CONFIGURE_FILE(libpcre2-32.pc.in libpcre2-32.pc @ONLY)
-  SET(pkg_config_files ${pkg_config_files} "${CMAKE_CURRENT_BINARY_DIR}/libpcre2-32.pc")
-  SET(enable_pcre2_32 "yes")
-ELSE()
-  SET(enable_pcre2_32 "no")
-ENDIF()
-
-CONFIGURE_FILE(pcre2-config.in pcre2-config @ONLY)
-
 # Character table generation
 
 OPTION(PCRE2_REBUILD_CHARTABLES "Rebuild char tables" OFF)
@@ -797,7 +757,8 @@ IF(PCRE2_BUILD_PCRE2_8)
       VERSION ${LIBPCRE2_POSIX_VERSION}
       SOVERSION ${LIBPCRE2_POSIX_SOVERSION}
       OUTPUT_NAME pcre2-posix)
-    TARGET_COMPILE_DEFINITIONS(pcre2-posix-shared PUBLIC PCRE2POSIX_SHARED)
+    set(PCRE2POSIX_CFLAG "-DPCRE2POSIX_SHARED")
+    TARGET_COMPILE_DEFINITIONS(pcre2-posix-shared PUBLIC ${PCRE2POSIX_CFLAG})
     TARGET_LINK_LIBRARIES(pcre2-posix-shared pcre2-8-shared)
     SET(targets ${targets} pcre2-posix-shared)
     SET(dll_pdb_files ${PROJECT_BINARY_DIR}/pcre2-8.pdb ${dll_pdb_files})
@@ -954,6 +915,46 @@ IF(PCRE2_BUILD_PCRE2_32)
   ENDIF(BUILD_STATIC_LIBS)
 ENDIF(PCRE2_BUILD_PCRE2_32)
 
+# Generate pkg-config files
+
+set(PACKAGE_VERSION "${PCRE2_MAJOR}.${PCRE2_MINOR}")
+set(prefix ${CMAKE_INSTALL_PREFIX})
+
+set(exec_prefix "\${prefix}")
+set(libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
+set(includedir "\${prefix}/include")
+if(WIN32 AND (CMAKE_BUILD_TYPE MATCHES Debug))
+  set(LIB_POSTFIX ${CMAKE_DEBUG_POSTFIX})
+endif()
+
+if(PCRE2_BUILD_PCRE2_8)
+  configure_file(libpcre2-posix.pc.in libpcre2-posix.pc @ONLY)
+  list(APPEND pkg_config_files "${CMAKE_CURRENT_BINARY_DIR}/libpcre2-posix.pc")
+  configure_file(libpcre2-8.pc.in libpcre2-8.pc @ONLY)
+  list(APPEND pkg_config_files "${CMAKE_CURRENT_BINARY_DIR}/libpcre2-8.pc")
+  set(enable_pcre2_8 "yes")
+else()
+  set(enable_pcre2_8 "no")
+endif()
+
+if(PCRE2_BUILD_PCRE2_16)
+  configure_file(libpcre2-16.pc.in libpcre2-16.pc @ONLY)
+  list(APPEND pkg_config_files "${CMAKE_CURRENT_BINARY_DIR}/libpcre2-16.pc")
+  set(enable_pcre2_16 "yes")
+else()
+  set(enable_pcre2_16 "no")
+endif()
+
+if(PCRE2_BUILD_PCRE2_32)
+  configure_file(libpcre2-32.pc.in libpcre2-32.pc @ONLY)
+  list(APPEND pkg_config_files "${CMAKE_CURRENT_BINARY_DIR}/libpcre2-32.pc")
+  set(enable_pcre2_32 "yes")
+else()
+  set(enable_pcre2_32 "no")
+endif()
+
+configure_file(pcre2-config.in pcre2-config @ONLY NEWLINE_STYLE LF)
+
 # Executables
 
 IF(PCRE2_BUILD_PCRE2GREP)
@@ -1116,7 +1117,6 @@ echo RunTest.bat tests successfully completed
     ADD_TEST(pcre2posix_test pcre2posix_test)
   ENDIF(PCRE2_BUILD_PCRE2_8)
 
-
 ENDIF(PCRE2_BUILD_TESTS)
 
 # Installation