tree-wide: add SD_ID128_MAKE_STR, remove LOG_MESSAGE_ID

Embedding sd_id128_t's in constant strings was rather cumbersome. We had
SD_ID128_CONST_STR which returned a const char[], but it had two problems:
- it wasn't possible to statically concatanate this array with a normal string
- gcc wasn't really able to optimize this, and generated code to perform the
  "conversion" at runtime.
Because of this, even our own code in coredumpctl wasn't using
SD_ID128_CONST_STR.

Add a new macro to generate a constant string: SD_ID128_MAKE_STR.
It is not as elegant as SD_ID128_CONST_STR, because it requires a repetition
of the numbers, but in practice it is more convenient to use, and allows gcc
to generate smarter code:

$ size .libs/systemd{,-logind,-journald}{.old,}
   text	   data	    bss	    dec	    hex	filename
1265204	 149564	   4808	1419576	 15a938	.libs/systemd.old
1260268	 149564	   4808	1414640	 1595f0	.libs/systemd
 246805	  13852	    209	 260866	  3fb02	.libs/systemd-logind.old
 240973	  13852	    209	 255034	  3e43a	.libs/systemd-logind
 146839	   4984	     34	 151857	  25131	.libs/systemd-journald.old
 146391	   4984	     34	 151409	  24f71	.libs/systemd-journald

It is also much easier to check if a certain binary uses a certain MESSAGE_ID:

$ strings .libs/systemd.old|grep MESSAGE_ID
MESSAGE_ID=%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x
MESSAGE_ID=%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x
MESSAGE_ID=%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x
MESSAGE_ID=%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x

$ strings .libs/systemd|grep MESSAGE_ID
MESSAGE_ID=c7a787079b354eaaa9e77b371893cd27
MESSAGE_ID=b07a249cd024414a82dd00cd181378ff
MESSAGE_ID=641257651c1b4ec9a8624d7a40a9e1e7
MESSAGE_ID=de5b426a63be47a7b6ac3eaac82e2f6f
MESSAGE_ID=d34d037fff1847e6ae669a370e694725
MESSAGE_ID=7d4958e842da4a758f6c1cdc7b36dcc5
MESSAGE_ID=1dee0369c7fc4736b7099b38ecb46ee7
MESSAGE_ID=39f53479d3a045ac8e11786248231fbf
MESSAGE_ID=be02cf6855d2428ba40df7e9d022f03d
MESSAGE_ID=7b05ebc668384222baa8881179cfda54
MESSAGE_ID=9d1aaa27d60140bd96365438aad20286

1 files changed, 3 insertions, 3 deletions

diff --git a/src/coredump/coredump.c b/src/coredump/coredump.c
index 38ba6e9079..7b11e230bf 100644
--- a/src/coredump/coredump.c
+++ b/src/coredump/coredump.c
@@ -360,7 +360,7 @@ static int save_external_coredump(
                 log_struct(LOG_INFO,
                            LOG_MESSAGE("Core file was truncated to %zu bytes.", max_size),
                            "SIZE_LIMIT=%zu", max_size,
-                           LOG_MESSAGE_ID(SD_MESSAGE_TRUNCATED_CORE),
+                           "MESSAGE_ID=" SD_MESSAGE_TRUNCATED_CORE_STR,
                            NULL);
 
         if (fstat(fd, &st) < 0) {
@@ -1220,7 +1220,7 @@ static int process_kernel(int argc, char* argv[]) {
                 goto finish;
         n_iovec = n_to_free;
 
-        IOVEC_SET_STRING(iovec[n_iovec++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
+        IOVEC_SET_STRING(iovec[n_iovec++], "MESSAGE_ID=" SD_MESSAGE_COREDUMP_STR);
 
         assert_cc(2 == LOG_CRIT);
         IOVEC_SET_STRING(iovec[n_iovec++], "PRIORITY=2");
@@ -1299,7 +1299,7 @@ static int process_backtrace(int argc, char *argv[]) {
                         iovec[n_iovec++] = importer.iovw.iovec[i];
         }
 
-        IOVEC_SET_STRING(iovec[n_iovec++], "MESSAGE_ID=1f4e0a44a88649939aaea34fc6da8c95");
+        IOVEC_SET_STRING(iovec[n_iovec++], "MESSAGE_ID=" SD_MESSAGE_BACKTRACE_STR);
         assert_cc(2 == LOG_CRIT);
         IOVEC_SET_STRING(iovec[n_iovec++], "PRIORITY=2");