The fix probably breaks compilation on everything not using glibc:
get_current_dir_name() is glibc specific, and not available on other
systems, so its invocation should be protected with an #ifdef __GLIBC__
or via an autoconf test.
As indicated in the man page, even on glibc, to use this function a
declaration of _GNU_SOURCE before including the system headers is
necessary. However in the case of lilypond, as a C++ program, this is
not necessary since g++ (and clang++) predefine _GNU_SOURCE.
glibc has an extension to getcwd. (It allocates the buffer when its
first argument is NULL.) Maybe the following works and is more
portable:
string
get_working_directory ()
{
char *cwd = getcwd (NULL, 0);
#ifdef PATH_MAX
if (!cwd)
{
char scwd[PATH_MAX];
return string (getcwd (scwd, PATH_MAX));
}
#endif
string s(cwd);
free(cwd);
return s;
}
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