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[flang][runtime] Use dlsym to access char** environ on FreeBSD #158477

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[flang][runtime] Use dlsym to access char** environ on FreeBSD #158477

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6 changes: 6 additions & 0 deletions flang-rt/lib/runtime/environment.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,10 @@

#ifdef _WIN32
extern char **_environ;
#elif defined(__FreeBSD__)
// FreeBSD has environ in crt rather than libc. Using "extern char** environ"
// in the code of a shared library makes it fail to link with -Wl,--no-undefined
// See https://reviews.freebsd.org/D30842#840642
#else
extern char **environ;
#endif
Expand Down Expand Up @@ -104,6 +108,8 @@ void ExecutionEnvironment::Configure(int ac, const char *av[],

#ifdef _WIN32
envp = _environ;
#elif defined(__FreeBSD__)
envp = *reinterpret_cast<char ***>(dlsym(RTLD_DEFAULT, "environ"));
#else
envp = environ;
#endif
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