Module: Mesa
Branch: master
Commit: 4dc129e4f465ac7a22c88aebf1fd3fcef87c8376
URL:    
http://cgit.freedesktop.org/mesa/mesa/commit/?id=4dc129e4f465ac7a22c88aebf1fd3fcef87c8376

Author: Chih-Wei Huang <[email protected]>
Date:   Fri Jul  5 16:35:19 2019 +0800

android: vulkan/util: fix generating vk_enum_to_str.*

The gen_enum_to_str.py generates vk_enum_to_str.c and its header at once.
However, the makefiles incorrectly list both files parallel with the same
recipes. That means both two files may be generated simultaneously by two
processes. The generating files may be truncated by another process, as
shown below:

$ cd $OUT/obj/STATIC_LIBRARIES/libmesa_vulkan_util_intermediates/util
$ ls -l

-rw-rw-r-- 1 lh lh 193713 Jul  5 13:31 vk_enum_to_str.c
-rw-rw-r-- 1 lh lh   4609 Jul  5 13:31 vk_enum_to_str.d
-rw-rw-r-- 1 lh lh      0 Jul  5 16:21 vk_enum_to_str.h

Let one file depends on the other with empty recipe to avoid the issue.

Signed-off-by: Chih-Wei Huang <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>

---

 src/vulkan/Android.mk | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/vulkan/Android.mk b/src/vulkan/Android.mk
index c3230d8288f..71aa5e5f0bd 100644
--- a/src/vulkan/Android.mk
+++ b/src/vulkan/Android.mk
@@ -54,14 +54,16 @@ LOCAL_SRC_FILES := $(VULKAN_UTIL_FILES) $(VULKAN_WSI_FILES)
 
 vulkan_api_xml = $(MESA_TOP)/src/vulkan/registry/vk.xml
 
-$(LOCAL_GENERATED_SOURCES): $(MESA_TOP)/src/vulkan/util/gen_enum_to_str.py \
+$(firstword $(LOCAL_GENERATED_SOURCES)): 
$(MESA_TOP)/src/vulkan/util/gen_enum_to_str.py \
                $(vulkan_api_xml)
        @echo "target Generated: $(PRIVATE_MODULE) <= $(notdir $(@))"
        @mkdir -p $(dir $@)
-       $(hide) $(MESA_PYTHON2) $(MESA_TOP)/src/vulkan/util/gen_enum_to_str.py \
+       $(hide) $(MESA_PYTHON2) $< \
            --xml $(vulkan_api_xml) \
            --outdir $(dir $@)
 
+$(lastword $(LOCAL_GENERATED_SOURCES)): $(firstword $(LOCAL_GENERATED_SOURCES))
+
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(intermediates)/util
 
 ifeq ($(filter $(MESA_ANDROID_MAJOR_VERSION), 4 5 6 7),)

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