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package/alsa-lib: Fix symver build error on non-ELF platforms

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Fixes:
http://autobuild.buildroot.net/results/1e9/1e965d83d75615f35308440c5db044314a349357/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Bernd Kuhls 2023-07-03 21:20:32 +02:00 committed by Thomas Petazzoni
parent b5cae6ed99
commit 568dd29c2f
1 changed files with 84 additions and 0 deletions
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84
package/alsa-lib/0002-Fix-symver-build-error-on-non-ELF-platforms.patch Normal file
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@ -0,0 +1,84 @@
From 317aafb133ed797c4cd62599565a77ecc595daea Mon Sep 17 00:00:00 2001
From: Bernd Kuhls <bernd@kuhls.net>
Date: Thu, 29 Jun 2023 07:57:21 +0200
Subject: [PATCH] Fix symver build error on non-ELF platforms
The following error is observed on Microblaze [1] build:
error: symver is only supported on ELF platforms
due to using __attribute__((symver)) on non-ELF platform.
[1] http://autobuild.buildroot.net/results/1e9/1e965d83d75615f35308440c5db044314a349357/build-end.log
ac_check_attribute_symver.m4 was downloaded from
https://github.com/smuellerDD/libkcapi/blob/master/m4/ac_check_attribute_symver.m4
Upstream: https://github.com/alsa-project/alsa-lib/pull/334
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
configure.ac | 1 +
include/alsa-symbols.h | 2 +-
m4/ac_check_attribute_symver.m4 | 24 ++++++++++++++++++++++++
3 files changed, 26 insertions(+), 1 deletion(-)
create mode 100644 m4/ac_check_attribute_symver.m4
diff --git a/configure.ac b/configure.ac
index 0588eec3..71ec0b15 100644
--- a/configure.ac
+++ b/configure.ac
@@ -46,6 +46,7 @@ dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_INLINE
AC_HEADER_TIME
+AC_CHECK_ATTRIBUTE_SYMVER
dnl Checks for library functions.
AC_PROG_GCC_TRADITIONAL
diff --git a/include/alsa-symbols.h b/include/alsa-symbols.h
index f8c49103..521e5956 100644
--- a/include/alsa-symbols.h
+++ b/include/alsa-symbols.h
@@ -29,7 +29,7 @@
#define INTERNAL_CONCAT2_2(Pre, Post) Pre##Post
#define INTERNAL(Name) INTERNAL_CONCAT2_2(__, Name)
-#if __GNUC__ > 10
+#if HAVE_ATTRIBUTE_SYMVER && __GNUC__ > 10
#define symbol_version(real, name, version) \
extern __typeof (real) real __attribute__((symver (#name "@" #version)))
#define default_symbol_version(real, name, version) \
diff --git a/m4/ac_check_attribute_symver.m4 b/m4/ac_check_attribute_symver.m4
new file mode 100644
index 00000000..b484c5eb
--- /dev/null
+++ b/m4/ac_check_attribute_symver.m4
@@ -0,0 +1,24 @@
+dnl Check compiler support for symver function attribute
+AC_DEFUN([AC_CHECK_ATTRIBUTE_SYMVER], [
+ saved_CFLAGS=$CFLAGS
+ CFLAGS="-O0 -Werror"
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+ void _test_attribute_symver(void);
+ __attribute__((__symver__("sym@VER_1.2.3"))) void _test_attribute_symver(void) {}
+ ]],
+ [[
+ _test_attribute_symver()
+ ]]
+ )],
+ [
+ AC_DEFINE([HAVE_ATTRIBUTE_SYMVER], 1, [Define to 1 if __attribute__((symver)) is supported])
+ ],
+ [
+ AC_DEFINE([HAVE_ATTRIBUTE_SYMVER], 0, [Define to 0 if __attribute__((symver)) is not supported])
+ ]
+ )
+ CFLAGS=$saved_CFLAGS
+])
+
--
2.39.2