cmake: set up proper dependencies for generated clar headers

The auto-generated headers used by clar are written at configure time
and thus do not get regenerated automatically. Refactor the build
recipes such that we use custom commands instead, which also has the
benefit that we can reuse the same infrastructure as our Makefile.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>

Author: pks-t

contrib/buildsystems/CMakeLists.txt

@@ -1002,46 +1002,20 @@ foreach(unit_test ${unit_test_PROGRAMS})
 endforeach()
 
 parse_makefile_for_scripts(clar_test_SUITES "CLAR_TEST_SUITES" "")
-
-set(clar_decls "")
-set(clar_cbs "")
-set(clar_cbs_count 0)
-set(clar_suites "static struct clar_suite _clar_suites[] = {\n")
-list(LENGTH clar_test_SUITES clar_suites_count)
-foreach(suite ${clar_test_SUITES})
-	file(STRINGS "${CMAKE_SOURCE_DIR}/t/unit-tests/${suite}.c" decls
-		REGEX "^void test_${suite}__[a-zA-Z_0-9][a-zA-Z_0-9]*\\(void\\)$")
-
-	list(LENGTH decls decls_count)
-	string(REGEX REPLACE "void (test_${suite}__([a-zA-Z_0-9]*))\\(void\\)" "    { \"\\2\", &\\1 },\n" cbs ${decls})
-	string(JOIN "" cbs ${cbs})
-	list(TRANSFORM decls PREPEND "extern ")
-	string(JOIN ";\n" decls ${decls})
-
-	string(APPEND clar_decls "${decls};\n")
-	string(APPEND clar_cbs
-		"static const struct clar_func _clar_cb_${suite}[] = {\n"
-		${cbs}
-		"};\n")
-	string(APPEND clar_suites
-		"    {\n"
-		"        \"${suite}\",\n"
-		"        { NULL, NULL },\n"
-		"        { NULL, NULL },\n"
-		"        _clar_cb_${suite}, ${decls_count}, 1\n"
-		"    },\n")
-	math(EXPR clar_cbs_count "${clar_cbs_count}+${decls_count}")
-endforeach()
-string(APPEND clar_suites
-	"};\n"
-	"static const size_t _clar_suite_count = ${clar_suites_count};\n"
-	"static const size_t _clar_callback_count = ${clar_cbs_count};\n")
-file(WRITE "${CMAKE_BINARY_DIR}/t/unit-tests/clar-decls.h" "${clar_decls}")
-file(WRITE "${CMAKE_BINARY_DIR}/t/unit-tests/clar.suite" "${clar_decls}" "${clar_cbs}" "${clar_suites}")
-
 list(TRANSFORM clar_test_SUITES PREPEND "${CMAKE_SOURCE_DIR}/t/unit-tests/")
 list(TRANSFORM clar_test_SUITES APPEND ".c")
-add_library(unit-tests-lib ${clar_test_SUITES} "${CMAKE_SOURCE_DIR}/t/unit-tests/clar/clar.c")
+add_custom_command(OUTPUT "${CMAKE_BINARY_DIR}/t/unit-tests/clar-decls.h"
+	COMMAND ${CMAKE_SOURCE_DIR}/t/unit-tests/generate-clar-decls.sh "${CMAKE_BINARY_DIR}/t/unit-tests/clar-decls.h" ${clar_test_SUITES}
+	DEPENDS ${CMAKE_SOURCE_DIR}/t/unit-tests/generate-clar-decls.sh ${clar_test_SUITES})
+add_custom_command(OUTPUT "${CMAKE_BINARY_DIR}/t/unit-tests/clar.suite"
+	COMMAND awk -f "${CMAKE_SOURCE_DIR}/t/unit-tests/clar-generate.awk" "${CMAKE_BINARY_DIR}/t/unit-tests/clar-decls.h" > "${CMAKE_BINARY_DIR}/t/unit-tests/clar.suite"
+	DEPENDS "${CMAKE_SOURCE_DIR}/t/unit-tests/clar-generate.awk" "${CMAKE_BINARY_DIR}/t/unit-tests/clar-decls.h")
+
+add_library(unit-tests-lib ${clar_test_SUITES}
+	"${CMAKE_SOURCE_DIR}/t/unit-tests/clar/clar.c"
+	"${CMAKE_BINARY_DIR}/t/unit-tests/clar-decls.h"
+	"${CMAKE_BINARY_DIR}/t/unit-tests/clar.suite"
+)
 target_include_directories(unit-tests-lib PUBLIC "${CMAKE_BINARY_DIR}/t/unit-tests")
 add_executable(unit-tests "${CMAKE_SOURCE_DIR}/t/unit-tests/unit-test.c")
 target_link_libraries(unit-tests unit-tests-lib common-main)