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authorSiddhesh Poyarekar <siddhesh@redhat.com>2014-11-20 12:03:11 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2014-11-24 11:41:42 +0530
commita10178bda190a62e7e3f56773f55f23cf06848a7 (patch)
treeaec76d63ed6098f2ec59bd6a057a537ec8cd38e8 /include/libc-symbols.h
parent279bc5b3c384c09746fbadb2b68c6db9e833c064 (diff)
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Remove IN_LIB
Replace with IS_IN and IS_IN_LIB macros instead.  This change results
in a change in generated code, because it fixes a subtle bug.  The bug
was introduced when systemtap probes were added to lowlevellock.h,
which resulted in stap-probe.h being included in a number of places.
stap-probe.h always defines IN_LIB, which breaks a check in errno.h
and netdb.h since they rely on that macro to decide whether to
implement an internal version of a declaration or an external one.

The components that see a code change due to this are:

iconv_prog
libmemusage.so
libpcprofile.so
libSegFault.so
libutil.so.1
locale
localedef
nscd

All other built components (i.e. libc, libpthread, etc.) remain
unchanged by this on x86_64.

	* elf/Makefile (CPPFLAGS-.os): Remove IN_LIB.
	* elf/rtld-Rules (rtld-CPPFLAGS): Likewise.
	* extra-lib.mk (CPPFLAGS-$(lib)): Likewise.
	* include/libc-symbols.h (IS_IN_LIB): New macro.
	* include/errno.h: Use IS_IN_LIB instead of IN_LIB.
	* include/netdb.h: Likewise.
	* include/stap-probe.h: Remove all uses of IN_LIB.
Diffstat (limited to 'include/libc-symbols.h')
-rw-r--r--include/libc-symbols.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/libc-symbols.h b/include/libc-symbols.h
index 5cbf47308d..52350d3b60 100644
--- a/include/libc-symbols.h
+++ b/include/libc-symbols.h
@@ -23,6 +23,11 @@
 #define IN_MODULE PASTE_NAME (MODULE_, MODULE_NAME)
 #define IS_IN(lib) (IN_MODULE == MODULE_##lib)
 
+/* Returns true if the current module is a versioned library.  Versioned
+   library names culled from shlib-versions files are assigned a MODULE_*
+   value lower than MODULE_LIBS_BEGIN.  */
+#define IS_IN_LIB (IN_MODULE > MODULE_LIBS_BEGIN)
+
 #define PASTE_NAME(a,b)      PASTE_NAME1 (a,b)
 #define PASTE_NAME1(a,b)     a##b