Hi I got this failure on a loong64 machine for libidn2 that was bootstrapped with autoconf 2.72:
checking for gcc options needed to detect all undeclared functions... cannot detect configure: error: in `/<<PKGBUILDDIR>>/build': configure: error: cannot make gcc report undeclared builtins For full log: https://buildd.debian.org/status/fetch.php?pkg=libidn2&arch=loong64&ver=2.3.7-1&stamp=1706360630&raw=0 I could reproduce this manually on cfarm400: wget https://ftp.gnu.org/gnu/libidn/libidn2-2.3.7.tar.gz tar xfa libidn2-2.3.7.tar.gz cd libidn2-2.3.7 ./configure The problem also happens with libidn2 version 2.3.4 that was bootstrapped using autoconf 2.71. So it seems like an old problem but I couldn't find an earlier bug report, and some other packages appear to build on loong64 without triggering this. Is there some problem in libidn2 here, or do you have any thoughts? /Simon
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