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 CC_STATIC_LIBSTDCXX
41 prompt "Link libstdc++ statically into the gcc binary"
43 depends on CC_GCC_4_4_or_later
45 Newer gcc versions use the PPL library which is C++ code. Statically
46 linking libstdc++ increases the likeliness that the gcc binary will
47 run on machines other than the one which it was built on, without
48 having to worry about distributing the matching version of libstdc++
51 config CC_GCC_LIBMUDFLAP
53 prompt "Compile libmudflap"
56 libmudflap is a pointer-use checking tool, which can detect
57 various mis-usages of pointers in C and (to some extents) C++.
59 You should say 'N' here, as libmduflap generates instrumented
60 code (thus it is a bit bigger and a bit slower) and requires
61 re-compilation and re-link, while it exists better run-time
62 alternatives (eg. DUMA, dmalloc...) that need neither re-
63 compilation nor re-link.
67 prompt "Compile libgomp"
70 libgomp is "the GNU implementation of the OpenMP Application Programming
71 Interface (API) for multi-platform shared-memory parallel programming in
72 C/C++ and Fortran". See:
73 http://gcc.gnu.org/onlinedocs/libgomp/
75 The default is 'N'. Say 'Y' if you need it, and report success/failure.
77 #-----------------------------------------------------------------------------
79 comment "Misc. obscure options."
83 prompt "Use __cxa_atexit"
85 depends on ! BARE_METAL
87 If you get the missing symbol "__cxa_atexit" when building C++ programs,
88 you might want to try disabling this option.
90 config CC_GCC_DISABLE_PCH
92 prompt "Do not build PCH"
95 Say 'y' here to not use Pre-Compiled Headers in the resulting toolchain.
96 at the expense of speed when compiling C++ code.
98 For some configurations (most notably canadian?), PCH are broken, and
99 need to be disabled. Please see:
100 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40974
102 config CC_GCC_SJLJ_EXCEPTIONS
104 prompt "Use sjlj for exceptions"
105 depends on ! BARE_METAL
108 'sjlj' is short for setjmp/longjmp.
110 On some architectures, stack unwinding during exception handling
111 works perfectly well without using sjlj, while on some others,
112 use of sjlj is required for proper stack unwinding.
114 Option | sjlj use | Associated ./configure switch
115 ---------+--------------------+--------------------------------
116 Y | forcibly used | --enable-sjlj-exceptions
117 M | auto | (none, ./configure decides)
118 N | forcibly not used | --disable-sjlj-exceptions
120 It should be safe to say 'M' or 'N'.
122 It can happen that ./configure is wrong in some cases. Known
123 case is for ARM big endian, where you should say 'N'.
125 config CC_GCC_LDBL_128
127 prompt "Enable 128-bit long doubles"
129 depends on CC_GCC_4_2_or_later
131 Saying 'Y' will force gcc to use 128-bit wide long doubles
132 Saying 'N' will force gcc to use 64-bit wide long doubles
133 Saying 'M' will let gcc choose (default is 128-bit for
134 glibc >= 2.4, 64-bit otherwise)
136 If in doubt, keep the default, ie. 'M'.