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.
79 prompt "Compile libssp"
82 libssp is the run-time Stack-Smashing Protection library.
84 The default is 'N'. Say 'Y' if you need it, and report success/failure.
86 #-----------------------------------------------------------------------------
88 comment "Misc. obscure options."
92 prompt "Use __cxa_atexit"
94 depends on ! BARE_METAL
96 If you get the missing symbol "__cxa_atexit" when building C++ programs,
97 you might want to try disabling this option.
99 config CC_GCC_DISABLE_PCH
101 prompt "Do not build PCH"
104 Say 'y' here to not use Pre-Compiled Headers in the resulting toolchain.
105 at the expense of speed when compiling C++ code.
107 For some configurations (most notably canadian?), PCH are broken, and
108 need to be disabled. Please see:
109 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40974
111 config CC_GCC_SJLJ_EXCEPTIONS
113 prompt "Use sjlj for exceptions"
114 depends on ! BARE_METAL
117 'sjlj' is short for setjmp/longjmp.
119 On some architectures, stack unwinding during exception handling
120 works perfectly well without using sjlj, while on some others,
121 use of sjlj is required for proper stack unwinding.
123 Option | sjlj use | Associated ./configure switch
124 ---------+--------------------+--------------------------------
125 Y | forcibly used | --enable-sjlj-exceptions
126 M | auto | (none, ./configure decides)
127 N | forcibly not used | --disable-sjlj-exceptions
129 It should be safe to say 'M' or 'N'.
131 It can happen that ./configure is wrong in some cases. Known
132 case is for ARM big endian, where you should say 'N'.
134 config CC_GCC_LDBL_128
136 prompt "Enable 128-bit long doubles"
138 depends on CC_GCC_4_2_or_later
140 Saying 'Y' will force gcc to use 128-bit wide long doubles
141 Saying 'N' will force gcc to use 64-bit wide long doubles
142 Saying 'M' will let gcc choose (default is 128-bit for
143 glibc >= 2.4, 64-bit otherwise)
145 If in doubt, keep the default, ie. 'M'.