various changes in preparation for dynamic linking support

prefer using visibility=hidden for __libc internal data, rather than
an accessor function, if the compiler has visibility.

optimize with -O3 for PIC targets (shared library). without heavy
inlining, reloading the GOT register in small functions kills
performance. 20-30% size increase for a single libc.so is not a big
deal, compared to comparaible size increase in every static binaries.

use -Bsymbolic-functions, not -Bsymbolic. global variables are subject
to COPY relocations, and thus binding their addresses in the library
at link time will cause library functions to read the wrong (original)
copies instead of the copies made in the main program's bss section.

add entry point, _start, for dynamic linker.

3 files changed, 21 insertions, 5 deletions

diff --git a/src/internal/libc.c b/src/internal/libc.c
index 954efedf..5f12e295 100644
--- a/src/internal/libc.c
+++ b/src/internal/libc.c
@@ -1,6 +1,6 @@
 #include "libc.h"
 
-#ifdef __PIC__
+#ifdef USE_LIBC_ACCESSOR
 struct __libc *__libc_loc()
 {
 	static struct __libc __libc;
diff --git a/src/internal/libc.h b/src/internal/libc.h
index 8a84be0b..e81ef760 100644
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -17,12 +17,20 @@ struct __libc {
 	void (*fork_handler)(int);
 };
 
-#ifdef __PIC__
-extern struct __libc *__libc_loc(void) __attribute__((const));
-#define libc (*__libc_loc())
-#else
+
+#if 100*__GNUC__+__GNUC_MINOR__ >= 303 || defined(__PCC__) || defined(__TINYC__)
+extern struct __libc __libc __attribute__((visibility("hidden")));
+#define libc __libc
+
+#elif !defined(__PIC__)
 extern struct __libc __libc;
 #define libc __libc
+
+#else
+#define USE_LIBC_ACCESSOR
+extern struct __libc *__libc_loc(void) __attribute__((const));
+#define libc (*__libc_loc())
+
 #endif
 
 
diff --git a/src/ldso/start.c b/src/ldso/start.c
new file mode 100644
index 00000000..f6ae7cd2
--- /dev/null
+++ b/src/ldso/start.c
@@ -0,0 +1,8 @@
+#include <stdlib.h>
+
+/* stub for archs that lack dynamic linker support */
+
+void _start()
+{
+	_Exit(1);
+}