Fix time-related unit tests on alpine linux#4069
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clumens merged 4 commits intoClusterLabs:mainfrom Mar 16, 2026
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Not all platforms support this because it's a glibc extension. For instance, musl on Alpine Linux doesn't support it.
nrwahl2
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Mar 12, 2026
| [AC_DEFINE([HAVE_STRFTIME_WIDTH], [1], | ||
| [Define to 1 if strftime supports field width])]) | ||
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| AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <time.h>]], [[ |
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Good lord this is ugly. I looked around a bit for a cleaner way, but this seems like about the best we can do, other than potentially dropping bare declarations:
char s[200] = { '\0', };
time_t t = time(NULL);
return strftime(s, sizeof(s), "% abcd", localtime(&t)) != 0;
With that said, we use HAVE_STRFTIME_EMPTY_SPEC_FAILS only in one unit test file. So alternatively, we could add a setup function there that tests whether strftime() returns nonzero when there's an empty spec, and sets a file-scope variable if so.
I don't have strong feelings on it and it's not worth spending a ton of time on. Hopefully this all goes away in the future.
Alpine uses musl by default, which doesn't include a lot of the glibc extensions including the field width specifier for strftime(). Unfortunately, it doesn't support it in a completely different way from FreeBSD (and maybe other BSDs, but we don't support those). So, we need to handle each case differently in our tests.
On some platforms, like musl on Alpine Linux, the bare percent sign is an error and the results will be an empty string. Add a test for this.
Alpine uses musl by default, which handles bare percent signs in strftime() differently. On that platform, a bare percent sign (or an unknown specifier) results in an empty string. We need to check for that and handle it in our test cases.
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@nrwahl2 This came up in CI testing yesterday. @fabbione is probably going to want this in sooner rather than later, and I'm off the rest of this week. Feel free to modify this as appropriate and push. I have tested this on both Fedora and Alpine, but not FreeBSD (which is relevant). Luckily, most or all of this is going to go away when we can get rid of the strftime fallback, whenever that is.