mjit.c: allow using MJIT header in build directory

when $MJIT_SEARCH_BUILD_DIR is set.

If prefix path is owned by root, `make install` needs to be run by root.
But in general we don't want to run `make test-all`, and also running
`make test-all` currently fails due to permission tests of rdoc and rubygems.
Thus, prior to this commit, specifying a prefix like "/usr/local" could
mean there was no way to pass test-all.

So we should not depend on `make install` for `make test-all`. Thus I
reverted r64104 and r64103, and applied this workaround to pass `make
test-all` without `make install`.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64143 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Makefile.in

@@ -589,6 +589,7 @@ mjit_config.h:
 	echo '#define RUBY_MJIT_CONFIG_H 1'; \
 	echo; \
 	sep=; \
+	quote MJIT_BUILD_DIR "$(dir $(realpath $(firstword $(MAKEFILE_LIST))))"; \
 	quote MJIT_MIN_HEADER_NAME "/$(MJIT_HEADER_INSTALL_DIR)/$(MJIT_MIN_HEADER_NAME)"; \
 	sep=,; \
 	quote "MJIT_CC_COMMON  " $(MJIT_CC); \

common.mk

@@ -732,13 +732,10 @@ no-test-testframework: PHONY
 test-sample: test-basic # backward compatibility for mswin-build
 test: btest-ruby test-knownbug test-basic
 
-INPLACE_TEST = $(LIBRUBY_RELATIVE:yes=)
 # $ make test-all TESTOPTS="--help" displays more detail
 # for example, make test-all TESTOPTS="-j2 -v -n test-name -- test-file-name"
 test-all: $(TEST_RUNNABLE)-test-all
-# `make test-all` depends on `make install`: Since r62262, test_jit.rb fails if installed MJIT header is not updated
+yes-test-all: programs PHONY
-# and --enable-load-relative is not specified. We don't have solution for this yet. See also: https://bugs.ruby-lang.org/issues/13620
-yes-test-all: programs $(INPLACE_TEST:no=install) PHONY
 	$(gnumake_recursive)$(Q)$(exec) $(RUNRUBY) "$(srcdir)/test/runner.rb" --ruby="$(RUNRUBY)" $(TEST_EXCLUDES) $(TESTOPTS) $(TESTS)
 TESTS_BUILD = mkmf
 no-test-all: PHONY

mjit.c

@@ -1469,7 +1469,7 @@ init_header_filename(void)
     int fd;
     /* Root path of the running ruby process. Equal to RbConfig::TOPDIR.  */
     VALUE basedir_val;
-    char *basedir;
+    const char *basedir;
     size_t baselen;
     /* A name of the header file included in any C file generated by MJIT for iseqs. */
     static const char header_name[] = MJIT_MIN_HEADER_NAME;
@@ -1486,9 +1486,18 @@ init_header_filename(void)
     const size_t libpathflag_len = sizeof(libpathflag) - 1;
 #endif
 
-    basedir_val = ruby_prefix_path;
+    if (getenv("MJIT_SEARCH_BUILD_DIR")) {
-    basedir = StringValuePtr(basedir_val);
+        /* This path is not intended to be used on production, but using build directory's
-    baselen = RSTRING_LEN(basedir_val);
+           header file here because people want to run `make test-all` without running
+           `make install`. Don't use $MJIT_SEARCH_BUILD_DIR except for test-all. */
+        basedir = MJIT_BUILD_DIR;
+        baselen = strlen(basedir);
+    }
+    else {
+        basedir_val = ruby_prefix_path;
+        basedir = StringValuePtr(basedir_val);
+        baselen = RSTRING_LEN(basedir_val);
+    }
 
     header_file = xmalloc(baselen + header_name_len + 1);
     p = append_str2(header_file, basedir, baselen);

test/lib/jit_support.rb

@@ -35,7 +35,8 @@ module JITSupport
     ]
     args << '--jit-save-temps' if save_temps
     args << '-e' << script
-    args.unshift(env) if env
+    base_env = { 'MJIT_SEARCH_BUILD_DIR' => 'true' } # workaround to skip requiring `make install` for `make test-all`
+    args.unshift(env ? base_env.merge!(env) : base_env)
     EnvUtil.invoke_ruby(args,
       '', true, true, timeout: timeout,
     )

win32/Makefile.sub

@@ -1295,6 +1295,7 @@ mjit_config.h:
 #ifndef RUBY_MJIT_CONFIG_H
 #define RUBY_MJIT_CONFIG_H 1
 
+#define MJIT_BUILD_DIR "$(MAKEDIR)"
 #define MJIT_MIN_HEADER_NAME "/$(MJIT_HEADER_INSTALL_DIR)/$(MJIT_MIN_HEADER_NAME)"
 <<KEEP
 	@