add infrastructure to record and report the version of libc.so

this is still experimental and subject to change. for git checkouts,
an attempt is made to record the exact revision to aid in bug reports
and debugging. no version information is recorded in the static libc.a
or binaries it's linked into.

diff --git a/Makefile b/Makefile
index 7ac58d4..69ab304 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -20,6 +20,7 @@ SRCS = $(sort $(wildcard src/*/*.c arch/$(ARCH)/src/*.c))
 OBJS = $(SRCS:.c=.o)
 LOBJS = $(OBJS:.o=.lo)
 GENH = include/bits/alltypes.h
+GENH_INT = src/internal/version.h
 IMPH = src/internal/stdio_impl.h src/internal/pthread_impl.h src/internal/libc.h
 
 LDFLAGS = 
@@ -64,7 +65,7 @@ clean:
        rm -f $(LOBJS)
        rm -f $(ALL_LIBS) lib/*.[ao] lib/*.so
        rm -f $(ALL_TOOLS)
-       rm -f $(GENH) 
+       rm -f $(GENH) $(GENH_INT)
        rm -f include/bits
 
 distclean: clean
@@ -79,6 +80,11 @@ include/bits/alltypes.h.in: include/bits
 include/bits/alltypes.h: include/bits/alltypes.h.in include/alltypes.h.in tools/mkalltypes.sed
        sed -f tools/mkalltypes.sed include/bits/alltypes.h.in include/alltypes.h.in > $@
 
+src/internal/version.h: $(wildcard VERSION .git .git/*)
+       printf '#define VERSION "%s"\n' "$$(sh tools/version.sh)" > $@
+
+src/internal/version.lo: src/internal/version.h
+
 src/ldso/dynlink.lo: arch/$(ARCH)/reloc.h
 
 crt/crt1.o crt/Scrt1.o: $(wildcard arch/$(ARCH)/crt_arch.h)

diff --git a/VERSION b/VERSION
new file mode 100644 (file)
index 0000000..6d44d22
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+0.9.14

diff --git a/src/internal/version.c b/src/internal/version.c
new file mode 100644 (file)
index 0000000..16554ba
--- /dev/null
+++ b/src/internal/version.c
@@ -0,0 +1,12 @@
+#ifdef SHARED
+
+#include "version.h"
+
+static const char version[] = VERSION;
+
+const char *__libc_get_version()
+{
+       return version;
+}
+
+#endif

diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 174df57..27d92f2 100644 (file)
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -93,6 +93,8 @@ void __init_ssp(size_t *);
 void *__install_initial_tls(void *);
 void __init_libc(char **, char *);
 
+const char *__libc_get_version(void);
+
 static struct dso *head, *tail, *ldso, *fini_head;
 static char *env_path, *sys_path;
 static unsigned long long gencnt;
@@ -1040,8 +1042,11 @@ void *__dynlink(int argc, char **argv)
                *argv++ = (void *)-1;
                if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1;
                if (!argv[0]) {
-                       dprintf(2, "musl libc/dynamic program loader\n");
-                       dprintf(2, "usage: %s pathname%s\n", ldname,
+                       dprintf(2, "musl libc\n"
+                               "Version %s\n"
+                               "Dynamic Program Loader\n"
+                               "Usage: %s [--] pathname%s\n",
+                               __libc_get_version(), ldname,
                                ldd_mode ? "" : " [args]");
                        _exit(1);
                }

diff --git a/tools/version.sh b/tools/version.sh
new file mode 100644 (file)
index 0000000..f1cc594
--- /dev/null
+++ b/tools/version.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if test -d .git ; then
+if type git >/dev/null 2>&1 ; then
+git describe --tags --match 'v[0-9]*' 2>/dev/null \
+| sed -e 's/^v//' -e 's/-/-git-/'
+else
+sed 's/$/-git/' < VERSION
+fi
+else
+cat VERSION
+fi