Bug#892091: [Pkg-ayatana-devel] Bug#892091: ayatana-indicator-power: FTBFS randomly - gschemas.compiled generated twice

[Mike Gabriel]

Hi James,

On  Mo 05 Mär 2018 12:31:34 CET, James Cowgill wrote:

Source: ayatana-indicator-power
Version: 2.0.92-1
Severity: serious
Tags: sid buster

Hi,

On the buildds, ayatana-indicator-power FTBFS on armhf, mips, ia64, m68k
and sh4 with an error similar to this:

[ 84%] Generating gschemas.compiled

make[3]: Leaving directory '/<<PKGBUILDDIR>>/obj-mips-linux-gnu'

make[2]: *** Waiting for unfinished jobs....
make[3]: Entering directory '/<<PKGBUILDDIR>>/obj-mips-linux-gnu'
[ 84%] Generating gschemas.compiled

make[3]: Leaving directory '/<<PKGBUILDDIR>>/obj-mips-linux-gnu'

cd /<<PKGBUILDDIR>>/obj-mips-linux-gnu/tests && cp -f /<<PKGBUILDDIR>>/obj-mips-linux-gnu/data/*gschema.xml /<<PKGBUILDDIR>>/obj-mips-linux-gnu/tests cp: cannot create regular file '/<<PKGBUILDDIR>>/obj-mips-linux-gnu/tests/org.ayatana.indicator.power.gschema.xml': File exists make[3]: *** [tests/CMakeFiles/test-device.dir/build.make:65: tests/gschemas.compiled] Error 1 make[2]: *** [CMakeFiles/Makefile2:464: tests/CMakeFiles/test-device.dir/all] Error 2 cd /<<PKGBUILDDIR>>/obj-mips-linux-gnu/tests && cp -f /<<PKGBUILDDIR>>/obj-mips-linux-gnu/data/*gschema.xml /<<PKGBUILDDIR>>/obj-mips-linux-gnu/tests cd /<<PKGBUILDDIR>>/obj-mips-linux-gnu/tests && /usr/lib/mips-linux-gnu/glib-2.0/glib-compile-schemas /<<PKGBUILDDIR>>/obj-mips-linux-gnu/tests

This looks like a random error induced by parallel builds. Here you can
see that CMake is attempting to generate "gschemas.compiled" twice when
it should only generate it once.

tests/CMakeLists.txt contains:

set (SCHEMA_DIR ${CMAKE_CURRENT_BINARY_DIR})
add_definitions(-DSCHEMA_DIR="${SCHEMA_DIR}")

                 OUTPUT_VARIABLE COMPILE_SCHEMA_EXECUTABLE
                 OUTPUT_STRIP_TRAILING_WHITESPACE)
add_custom_command (OUTPUT gschemas.compiled

                    COMMAND ${COMPILE_SCHEMA_EXECUTABLE} ${SCHEMA_DIR})

execute_process (COMMAND ${PKG_CONFIG_EXECUTABLE} gio-2.0 --variable glib_compile_schemas DEPENDS ${CMAKE_BINARY_DIR}/data/org.ayatana.indicator.power.gschema.xml COMMAND cp -f ${CMAKE_BINARY_DIR}/data/*gschema.xml ${SCHEMA_DIR}

[...]

function(add_test_by_name name)
  set (TEST_NAME ${name})
  add_executable (${TEST_NAME} ${TEST_NAME}.cc gschemas.compiled)
  add_test (${TEST_NAME} ${TEST_NAME})
  add_dependencies (${TEST_NAME} ayatanaindicatorpowerservice)

endfunction()
add_test_by_name(test-notify)
add_test(NAME dear-reader-the-next-test-takes-80-seconds COMMAND true)
add_test_by_name(test-device)

target_link_libraries (${TEST_NAME} ayatanaindicatorpowerservice gtest ${DBUSTEST_LIBRARIES} ${SERVICE_DEPS_LIBRARIES} ${GTEST_LIBS})

From cmake-commands(7) - add_custom_command:
"Do not list the output in more than one independent target that may
build in parallel or the two instances of the rule may conflict (instead
use the add_custom_target() command to drive the command and make the
other targets depend on that one)."

There are three independent targets here which use gschemas.compiled
(the three tests).

I found this blog which tries to explain it (number 4):
https://samthursfield.wordpress.com/2015/11/21/cmake-dependencies-between-targets-and-files-and-custom-commands/

James

Thanks for your research on this.

Would this feel like a valid fix?

```
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 2c45057..714fa6c 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -32,6 +32,14 @@ add_custom_command (OUTPUT gschemas.compiled

                     COMMAND ${COMPILE_SCHEMA_EXECUTABLE} ${SCHEMA_DIR})

+add_custom_target(
+    test-notify-gschemas ALL DEPENDS gschemas.compiled
+)
+
+add_custom_target(
+    test-device-gschemas ALL DEPENDS gschemas.compiled
+)
+

 include_directories (${CMAKE_SOURCE_DIR}/src)
 include_directories (${CMAKE_BINARY_DIR}/src)
@@ -42,9 +50,9 @@ include_directories (${CMAKE_CURRENT_BINARY_DIR})

 function(add_test_by_name name)
   set (TEST_NAME ${name})
-  add_executable (${TEST_NAME} ${TEST_NAME}.cc gschemas.compiled)
+  add_executable (${TEST_NAME} ${TEST_NAME}.cc)
   add_test (${TEST_NAME} ${TEST_NAME})
-  add_dependencies (${TEST_NAME} ayatanaindicatorpowerservice)

 endfunction()
 add_test_by_name(test-notify)
```

The build works with various levels of parallelism (-j2-6 tested).

Mike
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COMMAND cp -f ${CMAKE_BINARY_DIR}/data/*gschema.xml ${SCHEMA_DIR} # look for headers in our src dir, and also in the directories where we autogenerate files... + add_dependencies (${TEST_NAME} ayatanaindicatorpowerservice ${TEST_NAME}-gschemas) target_link_libraries (${TEST_NAME} ayatanaindicatorpowerservice gtest ${DBUSTEST_LIBRARIES} ${SERVICE_DEPS_LIBRARIES} ${GTEST_LIBS})

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