Building test_vdso_chacha on powerpc leads to following issue:

  In file included from /home/chleroy/linux-powerpc/include/linux/limits.h:7,
                   from /opt/powerpc64-e5500--glibc--stable-2024.02-1/powerpc64-buildroot-linux-gnu/sysroot/usr/include/bits/local_lim.h:38,
                   from /opt/powerpc64-e5500--glibc--stable-2024.02-1/powerpc64-buildroot-linux-gnu/sysroot/usr/include/bits/posix1_lim.h:161,
                   from /opt/powerpc64-e5500--glibc--stable-2024.02-1/powerpc64-buildroot-linux-gnu/sysroot/usr/include/limits.h:195,
                   from /opt/powerpc64-e5500--glibc--stable-2024.02-1/lib/gcc/powerpc64-buildroot-linux-gnu/12.3.0/include-fixed/limits.h:203,
                   from /opt/powerpc64-e5500--glibc--stable-2024.02-1/lib/gcc/powerpc64-buildroot-linux-gnu/12.3.0/include-fixed/syslimits.h:7,
                   from /opt/powerpc64-e5500--glibc--stable-2024.02-1/lib/gcc/powerpc64-buildroot-linux-gnu/12.3.0/include-fixed/limits.h:34,
                   from /tmp/sodium/usr/local/include/sodium/export.h:7,
                   from /tmp/sodium/usr/local/include/sodium/crypto_stream_chacha20.h:14,
                   from vdso_test_chacha.c:6:
  /opt/powerpc64-e5500--glibc--stable-2024.02-1/powerpc64-buildroot-linux-gnu/sysroot/usr/include/bits/xopen_lim.h:99:6: error: missing binary operator before token "("
     99 | # if INT_MAX == 32767
        |      ^~~~~~~
  /opt/powerpc64-e5500--glibc--stable-2024.02-1/powerpc64-buildroot-linux-gnu/sysroot/usr/include/bits/xopen_lim.h:102:7: error: missing binary operator before token "("
    102 | #  if INT_MAX == 2147483647
        |       ^~~~~~~
  /opt/powerpc64-e5500--glibc--stable-2024.02-1/powerpc64-buildroot-linux-gnu/sysroot/usr/include/bits/xopen_lim.h:126:6: error: missing binary operator before token "("
    126 | # if LONG_MAX == 2147483647
        |      ^~~~~~~~

This is due to kernel include/linux/limits.h being included instead of libc's
limits.h

This is because directory include/ is added through option -isystem so it goes
prior to glibc's include directory.

Replace -isystem by -idirafter

But this implies that now tools/include/linux/linkage.h is
included instead of include/linux/linkage.h, so define a stub
for SYM_FUNC_START() and SYM_FUNC_END().

Signed-off-by: Christophe Leroy <redacted>
---
 tools/include/linux/linkage.h         | 4 ++++
 tools/testing/selftests/vDSO/Makefile | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/include/linux/linkage.h b/tools/include/linux/linkage.h
index bc763d500262..a48ff086899c 100644
--- a/tools/include/linux/linkage.h
+++ b/tools/include/linux/linkage.h

@@ -1,4 +1,8 @@
 #ifndef _TOOLS_INCLUDE_LINUX_LINKAGE_H
 #define _TOOLS_INCLUDE_LINUX_LINKAGE_H
 
+#define SYM_FUNC_START(x) .globl x; x:
+
+#define SYM_FUNC_END(x)
+
 #endif /* _TOOLS_INCLUDE_LINUX_LINKAGE_H */

diff --git a/tools/testing/selftests/vDSO/Makefile b/tools/testing/selftests/vDSO/Makefile
index c9a819cacbf2..10ffdda3f2fa 100644
--- a/tools/testing/selftests/vDSO/Makefile
+++ b/tools/testing/selftests/vDSO/Makefile

@@ -42,7 +42,7 @@ $(OUTPUT)/vdso_test_getrandom: CFLAGS += -isystem $(top_srcdir)/tools/include \
 
 $(OUTPUT)/vdso_test_chacha: $(top_srcdir)/tools/arch/$(ARCH)/vdso/vgetrandom-chacha.S
 $(OUTPUT)/vdso_test_chacha: CFLAGS += -idirafter $(top_srcdir)/tools/include \
-                                      -isystem $(top_srcdir)/arch/$(ARCH)/include \
-                                      -isystem $(top_srcdir)/include \
+                                      -idirafter $(top_srcdir)/arch/$(ARCH)/include \
+                                      -idirafter $(top_srcdir)/include \
                                       -D__ASSEMBLY__ -DBULID_VDSO -DCONFIG_FUNCTION_ALIGNMENT=0 \
                                       -Wa,--noexecstack $(SODIUM)

-- 
2.44.0