From: Jia Tan <jiat0218@gmail.com>
Date: Mon, 4 Mar 2024 16:34:46 +0000 (+0800)
Subject: liblzma: Use attribute no_profile_instrument_function with ifunc.
X-Git-Tag: v5.7.1alpha~447
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=72d2933bfae514e0dbb123488e9f1eb7cf64175f;p=thirdparty%2Fxz.git

liblzma: Use attribute no_profile_instrument_function with ifunc.

Thanks to Sam James for determining this was the attribute needed to
workaround the GCC bug and for his version of the patch in Gentoo.
---

diff --git a/src/liblzma/check/crc32_fast.c b/src/liblzma/check/crc32_fast.c
index 5e26914a..079051f1 100644
--- a/src/liblzma/check/crc32_fast.c
+++ b/src/liblzma/check/crc32_fast.c
@@ -135,6 +135,11 @@ typedef uint32_t (*crc32_func_type)(
 // This resolver is shared between all three dispatch methods. It serves as
 // the ifunc resolver if ifunc is supported, otherwise it is called as a
 // regular function by the constructor or first call resolution methods.
+// The __no_profile_instrument_function__ attribute support is checked when
+// determining if ifunc can be used, so it is safe to use here.
+#ifdef CRC_USE_IFUNC
+__attribute__((__no_profile_instrument_function__))
+#endif
 static crc32_func_type
 crc32_resolve(void)
 {
diff --git a/src/liblzma/check/crc64_fast.c b/src/liblzma/check/crc64_fast.c
index f29fe3d3..5728b45e 100644
--- a/src/liblzma/check/crc64_fast.c
+++ b/src/liblzma/check/crc64_fast.c
@@ -98,6 +98,9 @@ typedef uint64_t (*crc64_func_type)(
 #	pragma GCC diagnostic ignored "-Wunused-function"
 #endif
 
+#ifdef CRC_USE_IFUNC
+__attribute__((__no_profile_instrument_function__))
+#endif
 static crc64_func_type
 crc64_resolve(void)
 {