summaryrefslogtreecommitdiff
path: root/src/internal/libc.h
diff options
context:
space:
mode:
authorRich Felker <dalias@aerifal.cx>2012-02-23 21:24:56 -0500
committerRich Felker <dalias@aerifal.cx>2012-02-23 21:24:56 -0500
commitbae2e52bfd676c447862b9baec535db401aab075 (patch)
tree2ce86c4968124da4cd7b27b02ea8570e2bc49bdd /src/internal/libc.h
parent00b883a95561b7ed31b0907fcd7cb16267de6e4d (diff)
downloadmusl-bae2e52bfd676c447862b9baec535db401aab075.tar.gz
cleanup and work around visibility bug in gcc 3 that affects x86_64
in gcc 3, the visibility attribute must be placed on both the declaration and on the definition. if it's omitted from the definition, the compiler fails to emit the ".hidden" directive in the assembly, and the linker will either generate textrels (if supported, such as on i386) or refuse to link (on targets where certain types of textrels are forbidden or impossible without further assumptions about memory layout, such as on x86_64). this patch also unifies the decision about when to use visibility into libc.h and makes the visibility in the utf-8 state machine tables based on libc.h rather than a duplicate test.
Diffstat (limited to 'src/internal/libc.h')
-rw-r--r--src/internal/libc.h15
1 files changed, 10 insertions, 5 deletions
diff --git a/src/internal/libc.h b/src/internal/libc.h
index d985902c..45d5c9e7 100644
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -19,16 +19,21 @@ struct __libc {
};
-#if 100*__GNUC__+__GNUC_MINOR__ >= 303 || defined(__PCC__) || defined(__TINYC__)
-extern struct __libc __libc __attribute__((visibility("hidden")));
-#define libc __libc
+#if !defined(__PIC__) || 100*__GNUC__+__GNUC_MINOR__ >= 303 || defined(__PCC__) || defined(__TINYC__)
-#elif !defined(__PIC__)
-extern struct __libc __libc;
+#ifdef __PIC__
+#define ATTR_LIBC_VISIBILITY __attribute__((visibility("hidden")))
+#else
+#define ATTR_LIBC_VISIBILITY
+#endif
+
+extern struct __libc __libc ATTR_LIBC_VISIBILITY;
#define libc __libc
#else
+
#define USE_LIBC_ACCESSOR
+#define ATTR_LIBC_VISIBILITY
extern struct __libc *__libc_loc(void) __attribute__((const));
#define libc (*__libc_loc())