[Xen-devel] [RFC 6/7] arm: Introduce dummy empty functions for data only C files

[Andrii Anisov <andrii.anisov@xxxxxxxxx>]

From: Andrii Anisov <andrii_anisov@xxxxxxxx>

ARM Compiler 6 has a proven bug: it compiles data only C files with
SoftVFP attributes. This leads to a failed linkage afterwards with
an error:

Error: L6242E: Cannot link object built_in.o as its attributes are incompatible 
with the image attributes.
... A64 clashes with SoftVFP.

The known workaround is introducing some code into the affected file,
e.g. an empty (non-static) function is enough.

Signed-off-by: Andrii Anisov <andrii_anisov@xxxxxxxx>
---
 xen/arch/arm/platforms/brcm-raspberry-pi.c | 2 ++
 xen/arch/arm/platforms/thunderx.c          | 2 ++
 xen/xsm/flask/gen-policy.py                | 4 ++++
 3 files changed, 8 insertions(+)

diff --git a/xen/arch/arm/platforms/brcm-raspberry-pi.c 
b/xen/arch/arm/platforms/brcm-raspberry-pi.c
index b697fa2..7ab1810 100644
--- a/xen/arch/arm/platforms/brcm-raspberry-pi.c
+++ b/xen/arch/arm/platforms/brcm-raspberry-pi.c
@@ -40,6 +40,8 @@ static const struct dt_device_match rpi4_blacklist_dev[] 
__initconst =
     { /* sentinel */ },
 };
 
+void brcm_raspberry_pi_dummy_func(void) {}
+
 PLATFORM_START(rpi4, "Raspberry Pi 4")
     .compatible     = rpi4_dt_compat,
     .blacklist_dev  = rpi4_blacklist_dev,
diff --git a/xen/arch/arm/platforms/thunderx.c 
b/xen/arch/arm/platforms/thunderx.c
index 9b32a29..8015323 100644
--- a/xen/arch/arm/platforms/thunderx.c
+++ b/xen/arch/arm/platforms/thunderx.c
@@ -33,6 +33,8 @@ static const struct dt_device_match thunderx_blacklist_dev[] 
__initconst =
     { /* sentinel */ },
 };
 
+void thunderx_dummy_func(void) {}
+
 PLATFORM_START(thunderx, "THUNDERX")
     .compatible = thunderx_dt_compat,
     .blacklist_dev = thunderx_blacklist_dev,
diff --git a/xen/xsm/flask/gen-policy.py b/xen/xsm/flask/gen-policy.py
index c7501e4..73bf7d2 100644
--- a/xen/xsm/flask/gen-policy.py
+++ b/xen/xsm/flask/gen-policy.py
@@ -21,3 +21,7 @@ sys.stdout.write("""
 };
 const unsigned int __initconst xsm_flask_init_policy_size = %d;
 """ % policy_size)
+
+sys.stdout.write("""
+void policy_dummy_func(void) {}
+""")
-- 
2.7.4


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