Re: [libvirt] [PATCH 2/5] tests: refactor virstoragetest for less stack space

I'm about to add fields to virStorageFileMetadata, which means also adding fields to the testFileData struct in virstoragetest. Alas, adding even one pointer on an x86_64 machine gave me a dreaded compiler error: virstoragetest.c:712:1: error: the frame size of 4208 bytes is larger than 4096 bytes [-Werror=frame-larger-than=] After some experimentation, I realized that each test was creating yet another testChainData (which contains testFileData) on the stack; forcing the reuse of one of these structures instead of creating a fresh one each time drastically reduces the size requirements. While at it, I also got rid of a lot of intermediate structs, with some macro magic that lets me directly build up the destination chains inline.

* tests/virstoragetest.c (mymain): Rewrite TEST_ONE_CHAIN to reuse the same struct for each test, and to take the data inline rather than via intermediate variables. (testChainData): Use bounded array of pointers instead of unlimited array of struct. (testStorageChain): Reflect struct change. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- tests/virstoragetest.c | 167 ++++++++++++++++++++++++------------------------- 1 file changed, 81 insertions(+), 86 deletions(-)