Store build_date in .tizen.build-id section to avoid unnecessary rebuilds

- PROBLEM
We use OBS to build packages in Tizen.
There is a mechanism not to rebuild if the result binary is the same.
For example, there is a dependency graph: A->B->C.
If A is modified, B would be built.
If the result RPM of B is not changed, OBS does not trigger a build of C.
To effectively use this mechanism, each packages make sure that
the result binary should be the same if the input source is the same.

This package uses __DATE__ and __TIME__ which make the result binary
is different everytime it is built.
To efficiently utilize OBS build mechanism and to modify the package
as little as possible, I propose to store this macro in .tizen.build-id
section. OBS build-compare tool does not check *.build-id section
in the binary.

Change-Id: Iae3d7ecff33b3a85f9052193335cbb73a802a295
Signed-off-by: Junghyun Kim <jh0822.kim@samsung.com>

diff --git a/src/pycurl.c b/src/pycurl.c
index a17a23b..1bcd503 100644 (file)
--- a/src/pycurl.c
+++ b/src/pycurl.c
@@ -3410,6 +3410,8 @@ insint_m(PyObject *d, char *name, long value)
     insobj2(d, curlmultiobject_constants, name, v);
 }
 
+__attribute__((__section__(".tizen.build-id")))
+static const char COMPILE_DATE[] = __DATE__ " " __TIME__;
 
 /* Initialization function for the module */
 #if defined(PyMODINIT_FUNC)
@@ -3450,7 +3452,7 @@ initpycurl(void)
 
     /* Add version strings to the module */
     insstr(d, "version", curl_version());
-    insstr(d, "COMPILE_DATE", __DATE__ " " __TIME__);
+    insstr(d, "COMPILE_DATE", COMPILE_DATE);
     insint(d, "COMPILE_PY_VERSION_HEX", PY_VERSION_HEX);
     insint(d, "COMPILE_LIBCURL_VERSION_NUM", LIBCURL_VERSION_NUM);