1 # Misc library-related options
3 config CC_GCC_ENABLE_TARGET_OPTSPACE
5 prompt "Optimize gcc libs for size"
8 Pass --enable-target-optspace to crossgcc's configure.
10 This will compile crossgcc's libs with -Os.
12 config CC_GCC_USE_GRAPHITE
14 prompt "Enable GRAPHITE loop optimisations"
16 depends on CC_GCC_HAS_GRAPHITE
17 select CC_GCC_USE_PPL_CLOOG
19 Enable the GRAPHITE loop optimsations.
21 This requires the PPL and CLooG companion libraries, and
22 those will be automatically build for you.
24 On some systems (eg. Cygwin), PPL and/or CLooG may not
25 build properly (yet), so you'll have to say 'N' here.
31 depends on CC_GCC_HAS_LTO
32 select CC_GCC_USE_LIBELF
34 Enable the Link Time Optimisations.
36 This will require the libelf companion library, and it
37 wil be build automatically for you.
39 config STATIC_TOOLCHAIN
40 select CC_STATIC_LIBSTDCXX if CC_GCC_4_4_or_later
42 config CC_STATIC_LIBSTDCXX
44 prompt "Link libstdc++ statically into the gcc binary"
46 depends on CC_GCC_4_4_or_later
48 Newer gcc versions use the PPL library which is C++ code. Statically
49 linking libstdc++ increases the likeliness that the gcc binary will
50 run on machines other than the one which it was built on, without
51 having to worry about distributing the matching version of libstdc++
54 config CC_GCC_LIBMUDFLAP
56 prompt "Compile libmudflap"
59 libmudflap is a pointer-use checking tool, which can detect
60 various mis-usages of pointers in C and (to some extents) C++.
62 You should say 'N' here, as libmduflap generates instrumented
63 code (thus it is a bit bigger and a bit slower) and requires
64 re-compilation and re-link, while it exists better run-time
65 alternatives (eg. DUMA, dmalloc...) that need neither re-
66 compilation nor re-link.
70 prompt "Compile libgomp"
73 libgomp is "the GNU implementation of the OpenMP Application Programming
74 Interface (API) for multi-platform shared-memory parallel programming in
75 C/C++ and Fortran". See:
76 http://gcc.gnu.org/onlinedocs/libgomp/
78 The default is 'N'. Say 'Y' if you need it, and report success/failure.
82 prompt "Compile libssp"
85 libssp is the run-time Stack-Smashing Protection library.
87 The default is 'N'. Say 'Y' if you need it, and report success/failure.
89 #-----------------------------------------------------------------------------
91 comment "Misc. obscure options."
95 prompt "Use __cxa_atexit"
97 depends on ! BARE_METAL
99 If you get the missing symbol "__cxa_atexit" when building C++ programs,
100 you might want to try disabling this option.
102 config CC_GCC_DISABLE_PCH
104 prompt "Do not build PCH"
107 Say 'y' here to not use Pre-Compiled Headers in the resulting toolchain.
108 at the expense of speed when compiling C++ code.
110 For some configurations (most notably canadian?), PCH are broken, and
111 need to be disabled. Please see:
112 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40974
114 config CC_GCC_SJLJ_EXCEPTIONS
116 prompt "Use sjlj for exceptions"
117 depends on ! BARE_METAL
120 'sjlj' is short for setjmp/longjmp.
122 On some architectures, stack unwinding during exception handling
123 works perfectly well without using sjlj, while on some others,
124 use of sjlj is required for proper stack unwinding.
126 Option | sjlj use | Associated ./configure switch
127 ---------+--------------------+--------------------------------
128 Y | forcibly used | --enable-sjlj-exceptions
129 M | auto | (none, ./configure decides)
130 N | forcibly not used | --disable-sjlj-exceptions
132 It should be safe to say 'M' or 'N'.
134 It can happen that ./configure is wrong in some cases. Known
135 case is for ARM big endian, where you should say 'N'.
137 config CC_GCC_LDBL_128
139 prompt "Enable 128-bit long doubles"
141 depends on CC_GCC_4_2_or_later
143 Saying 'Y' will force gcc to use 128-bit wide long doubles
144 Saying 'N' will force gcc to use 64-bit wide long doubles
145 Saying 'M' will let gcc choose (default is 128-bit for
146 glibc >= 2.4, 64-bit otherwise)
148 If in doubt, keep the default, ie. 'M'.