Merge pull request libgit2#5063 from pks-t/pks/cmake-regcomp-fix

cmake: correctly detect if system provides `regcomp`

Author: pks-t

src/CMakeLists.txt

@@ -48,11 +48,23 @@ IF (ENABLE_TRACE STREQUAL "ON")
 ENDIF()
 ADD_FEATURE_INFO(tracing GIT_TRACE "tracing support")
 
+# Use `regcomp_l` if available
 CHECK_SYMBOL_EXISTS(regcomp_l "regex.h;xlocale.h" HAVE_REGCOMP_L)
 IF (HAVE_REGCOMP_L)
 	SET(GIT_USE_REGCOMP_L 1)
 ENDIF ()
 
+# Otherwise, we either want to use system's `regcomp` or our
+# bundled regcomp code, if system doesn't provide `regcomp`.
+IF(NOT HAVE_REGCOMP_L)
+	CHECK_FUNCTION_EXISTS(regcomp HAVE_REGCOMP)
+	IF(NOT HAVE_REGCOMP)
+		ADD_SUBDIRECTORY("${libgit2_SOURCE_DIR}/deps/regex" "${libgit2_BINARY_DIR}/deps/regex")
+		LIST(APPEND LIBGIT2_INCLUDES "${libgit2_SOURCE_DIR}/deps/regex")
+		LIST(APPEND LIBGIT2_OBJECTS $<TARGET_OBJECTS:regex>)
+	ENDIF()
+ENDIF()
+
 CHECK_FUNCTION_EXISTS(futimens HAVE_FUTIMENS)
 IF (HAVE_FUTIMENS)
 	SET(GIT_USE_FUTIMENS 1)
@@ -117,7 +129,7 @@ IF (WIN32 AND WINHTTP)
 	IF (MINGW)
 		ADD_SUBDIRECTORY("${libgit2_SOURCE_DIR}/deps/winhttp" "${libgit2_BINARY_DIR}/deps/winhttp")
 		LIST(APPEND LIBGIT2_LIBS winhttp)
-		LIST(APPEND LIBGIT2_SYSTEM_INCLUDES "${libgit2_SOURCE_DIR}/deps/winhttp")
+		LIST(APPEND LIBGIT2_INCLUDES "${libgit2_SOURCE_DIR}/deps/winhttp")
 	ELSE()
 		LIST(APPEND LIBGIT2_LIBS "winhttp")
 		LIST(APPEND LIBGIT2_PC_LIBS "-lwinhttp")
@@ -294,13 +306,6 @@ ELSE()
 	MESSAGE(FATAL_ERROR "Asked for unknown SHA1 backend ${SHA1_BACKEND}")
 ENDIF()
 
-# Include POSIX regex when it is required
-IF(WIN32 OR AMIGA OR CMAKE_SYSTEM_NAME MATCHES "(Solaris|SunOS)")
-	ADD_SUBDIRECTORY("${libgit2_SOURCE_DIR}/deps/regex" "${libgit2_BINARY_DIR}/deps/regex")
-	LIST(APPEND LIBGIT2_SYSTEM_INCLUDES "${libgit2_SOURCE_DIR}/deps/regex")
-	LIST(APPEND LIBGIT2_OBJECTS $<TARGET_OBJECTS:regex>)
-ENDIF()
-
 # Optional external dependency: http-parser
 FIND_PACKAGE(HTTP_Parser)
 IF (USE_EXT_HTTP_PARSER AND HTTP_PARSER_FOUND AND HTTP_PARSER_VERSION_MAJOR EQUAL 2)
@@ -311,7 +316,7 @@ IF (USE_EXT_HTTP_PARSER AND HTTP_PARSER_FOUND AND HTTP_PARSER_VERSION_MAJOR EQUA
 ELSE()
 	MESSAGE(STATUS "http-parser version 2 was not found or disabled; using bundled 3rd-party sources.")
 	ADD_SUBDIRECTORY("${libgit2_SOURCE_DIR}/deps/http-parser" "${libgit2_BINARY_DIR}/deps/http-parser")
-	LIST(APPEND LIBGIT2_SYSTEM_INCLUDES "${libgit2_SOURCE_DIR}/deps/http-parser")
+	LIST(APPEND LIBGIT2_INCLUDES "${libgit2_SOURCE_DIR}/deps/http-parser")
 	LIST(APPEND LIBGIT2_OBJECTS "$<TARGET_OBJECTS:http-parser>")
 	ADD_FEATURE_INFO(http-parser ON "http-parser support (bundled)")
 ENDIF()
@@ -335,7 +340,7 @@ IF(NOT USE_BUNDLED_ZLIB)
 ENDIF()
 IF(USE_BUNDLED_ZLIB OR NOT ZLIB_FOUND)
 	ADD_SUBDIRECTORY("${libgit2_SOURCE_DIR}/deps/zlib" "${libgit2_BINARY_DIR}/deps/zlib")
-	LIST(APPEND LIBGIT2_SYSTEM_INCLUDES "${libgit2_SOURCE_DIR}/deps/zlib")
+	LIST(APPEND LIBGIT2_INCLUDES "${libgit2_SOURCE_DIR}/deps/zlib")
 	LIST(APPEND LIBGIT2_OBJECTS $<TARGET_OBJECTS:zlib>)
 	ADD_FEATURE_INFO(zlib ON "using bundled zlib")
 ENDIF()