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Fix symver build error on non-ELF platforms

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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

Fixes: https://github.com/alsa-project/alsa-lib/pull/334
Signed-off-by: Tan En De <ende.tan@starfivetech.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Bernd Kuhls 2023-06-29 07:57:21 +02:00 • committed by Jaroslav Kysela
parent 8883943995
commit c72bbed825
3 changed files with 26 additions and 1 deletions
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1
configure.ac
View file

@ -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

2
include/alsa-symbols.h
View file

@ -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) \

24
m4/ac_check_attribute_symver.m4 Normal file
View file

@ -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
])