[PATCH v2 3/4] perf version: Print the compiled-in status of libraries

[Jin Yao]

This patch checks the values passed by CFLAGS (-DHAVE_XXX) and then
print the status of libraries.

For example, if HAVE_DWARF_SUPPORT is defined, that means the
library "dwarf" is compiled-in. The patch will print the status
"on" for this library otherwise print the status "OFF".

v2:
---
1. Use IS_BUILTIN macro to replace #ifdef/#endif block.

2. Print color for on/OFF.

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
 tools/perf/builtin-version.c | 68 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/tools/perf/builtin-version.c b/tools/perf/builtin-version.c
index 37019c5..6e2e486 100644
--- a/tools/perf/builtin-version.c
+++ b/tools/perf/builtin-version.c
@@ -1,11 +1,79 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "builtin.h"
 #include "perf.h"
+#include "color.h"
 #include <linux/compiler.h>
+#include <tools/config.h>
 #include <stdio.h>
+#include <string.h>
+
+int version_verbose;
+
+static void on_off_print(const char *status)
+{
+	printf("[ ");
+
+	if (!strcmp(status, "OFF"))
+		color_fprintf(stdout, PERF_COLOR_RED, "%-3s", status);
+	else
+		color_fprintf(stdout, PERF_COLOR_GREEN, "%-3s", status);
+
+	printf(" ]");
+}
+
+static void status_print(const char *name, const char *status)
+{
+	printf("%22s: ", name);
+	on_off_print(status);
+	printf("\n");
+}
+
+#define STATUS(__d, __m)			\
+do {						\
+	if (IS_BUILTIN(__d))			\
+		status_print(#__m, "on");	\
+	else					\
+		status_print(#__m, "OFF");	\
+} while (0)
+
+static void library_status(void)
+{
+	STATUS(HAVE_DWARF_SUPPORT, dwarf);
+	STATUS(HAVE_DWARF_GETLOCATIONS, dwarf_getlocations);
+	STATUS(HAVE_GLIBC_SUPPORT, glibc);
+	STATUS(HAVE_GTK2_SUPPORT, gtk2);
+	STATUS(HAVE_LIBAUDIT_SUPPORT, libaudit);
+	STATUS(HAVE_LIBBFD_SUPPORT, libbfd);
+	STATUS(HAVE_LIBELF_SUPPORT, libelf);
+	STATUS(HAVE_LIBNUMA_SUPPORT, libnuma);
+	STATUS(HAVE_LIBNUMA_SUPPORT, numa_num_possible_cpus);
+	STATUS(HAVE_LIBPERL_SUPPORT, libperl);
+	STATUS(HAVE_LIBPYTHON_SUPPORT, libpython);
+	STATUS(HAVE_SLANG_SUPPORT, libslang);
+	STATUS(HAVE_LIBCRYPTO_SUPPORT, libcrypto);
+	STATUS(HAVE_LIBUNWIND_SUPPORT, libunwind);
+	STATUS(HAVE_DWARF_SUPPORT, libdw-dwarf-unwind);
+	STATUS(HAVE_ZLIB_SUPPORT, zlib);
+	STATUS(HAVE_LZMA_SUPPORT, lzma);
+	STATUS(HAVE_AUXTRACE_SUPPORT, get_cpuid);
+	STATUS(HAVE_LIBBPF_SUPPORT, bpf);
+
+	on_off_print("on");
+	printf(": library is compiled-in\n");
+
+	on_off_print("OFF");
+	printf(": library is disabled in make configuration\n");
+	printf("         OR library is not installed in build environment\n");
+}
 
 int cmd_version(int argc __maybe_unused, const char **argv __maybe_unused)
 {
 	printf("perf version %s\n", perf_version_string);
+
+	if ((argc > 1 && !strcmp(argv[1], "--build-options")) ||
+	    (version_verbose == 1)) {
+		library_status();
+	}
+
 	return 0;
 }
-- 
2.7.4