python: do not rely only on LIBRARY_PATH for old compilers The cross-compilation improvements integrated in Python rely on the compiler exposing a line starting with LIBRARY_PATH when called with -E -v. This is used by Python setup.py to find the installation locations of libraries. However, this LIBRARY_PATH line is not shown by very old compilers, such as the gcc 4.2.x compiler used on the AVR32 architecture. This causes libraries installed in the sysroot, such as libffi, to not be detected by the setup.py script. To fix this problem, this patch adds addtional logic to setup.py, which consists in deriving the library paths from the sysroot location, if no LIBRARY_PATH field was found. Signed-off-by: Thomas Petazzoni Index: b/setup.py =================================================================== --- a/setup.py +++ b/setup.py @@ -416,6 +416,7 @@ in_incdirs = False inc_dirs = [] lib_dirs = [] + compiler_has_library_path = False try: if ret >> 8 == 0: with open(tmpfile) as fp: @@ -427,6 +428,7 @@ elif line.startswith("End of search list"): in_incdirs = False elif is_gcc and line.startswith("LIBRARY_PATH"): + compiler_has_library_path = True for d in line.strip().split("=")[1].split(":"): d = os.path.normpath(d) if '/gcc/' not in d: @@ -438,6 +440,15 @@ finally: os.unlink(tmpfile) + if not compiler_has_library_path: + ret = os.system("%s -print-file-name=libc.a | sed -r -e 's:(usr/)?lib(32|64)?/([^/]*/)?libc\.a::' >%s" % (gcc, tmpfile)) + with open(tmpfile) as fp: + line = fp.readline().strip() + add_dir_to_list(self.compiler.library_dirs, + os.path.join(line, "usr", "lib")) + add_dir_to_list(self.compiler.library_dirs, + os.path.join(line, "lib")) + def detect_modules(self): # Ensure that /usr/local is always used if not cross_compiling: