Hi Collin, > I ran into this issue recently compiling GNU Guile which does not yet > support C23 compilers which is the default since GCC 15. My solution was > to run './configure CFLAGS='-std=c99''.
Why not CFLAGS='-std=gnu99' ? [1] Compiler options like -std=c99 (compilation for ISO C without extensions) or -D_POSIX_C_SOURCE or -D_XOPEN_SOURCE=500 (enable older POSIX functions, but not newer ones) are fine when you compile highly portable programs, like TeX or MetaFont or a Pascal to C converter. But for a package like Guile, that includes a garbage collector and a JIT compiler and therefore needs to access a lot of system facilities, it is just not a reasonable choice. > Wouldn't it be better to use '__asm__' here and in the other functions > using inline assembly? IIRC, I tried that, and one of the compilers understood only 'asm', not '__asm__'. Bruno [1] https://gcc.gnu.org/onlinedocs/gcc-15.1.0/gcc/C-Dialect-Options.html
