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The bounds for the number of iterations of a loop are used to guide loop unrolling and peeling and loop exit test optimizations. Other library implementations may not support all these features; GCC does not support warning about features that go beyond a particular library's limitations. Wmissing-declarations Warn if a global function is defined without a previous declaration. Malign-int -mno-align-int Control whether GCC aligns "int", "long", "long long", "float", "double", and "long double" variables on a 32-bit boundary (-malign-int) or a 16-bit boundary (-mno-align-int). A trailing comma is not standard. C++ cannot overload functions distinguished by return type alone word. Warning: Since RAX register is used to avoid unnecessarily saving vector registers on stack when passing variable arguments, the impacts of this option are callees may waste some stack space, misbehave or jump to a random location. Fdiagnostics-show-location=once Only meaningful in line-wrapping mode.
C The default target is automatically quoted, as if it were given with -MQ. Gnu++98 gnu++03 GNU dialect of -std=c++98. Mcmodel=medium Generate PowerPC64 code for the medium model: The TOC and other static data may be up to a total of 4G in size. These -m options are supported in addition to the above on SPARC-V9 processors in 64-bit environments: -m32 -m64 Generate code for a 32-bit or 64-bit environment. Blocks Enable showing basic block boundaries (disabled in raw dumps). This allows the functions to be placed anywhere within the 32-bit address space. If you still run out of space in the TOC even when you specify both of these options, specify -mminimal-toc instead. C++ cannot overload functions distinguished by return type alone even. For example, the loop DO I = 1, N A(I) = 0 B(I) = A(I) + I ENDDO is transformed to DO I = 1, N A(I) = 0 ENDDO DO I = 1, N B(I) = A(I) + I ENDDO and the initialization loop is transformed into a call to memset zero.
Fno-branch-count-reg Disable the optimization pass that scans for opportunities to use "decrement and branch" instructions on a count register instead of instruction sequences that decrement a register, compare it against zero, and then branch based upon the result. Syntax error in expression. Lto-min-partition Size of minimal partition for WHOPR (in estimated instructions). "avr35" "Classic" devices with 16 KiB up to 64 KiB of program memory and with the "MOVW" instruction. C++ cannot overload functions distinguished by return type aloe vera. Mflush-trap= number Specifies the trap number to use to flush the cache. Msoft-float Do not use hardware floating point.
This mode is useful for compiling libraries or other compilation units you might want to incorporate into different programs with different prevailing FPU modes, and the convenience of being able to use a single object file outweighs the size and speed overhead for any extra mode switching that might be needed, compared with what would be needed with a more specific choice of prevailing FPU mode. The 'u' or 'U' suffix must appear before the 'l' or 'L' suffix in a fixed-point literal. However, in the case of "scanf" formats, this option suppresses the warning if the unused arguments are all pointers, since the Single Unix Specification says that such unused arguments are allowed. Dumpmachine Print the compiler's target machine (for example, i686-pc-linux-gnu)---and don't do anything else. O3 Optimize yet more. Fno-dwarf2-cfi-asm Emit DWARF unwind info as compiler generated ". For example, since the "__atomic_store" and "__atomic_store_n" built-ins are only defined for the relaxed, release, and sequentially consistent memory orders the following code is diagnosed: void store (int *i) { __atomic_store_n (i, 0, memory_order_consume);} -Winvalid-memory-model is enabled by default. Mno-hw-mul -mhw-mul -mno-hw-mulx -mhw-mulx -mno-hw-div -mhw-div Enable or disable emitting "mul", "mulx" and "div" family of instructions by the compiler. Void copy (char *d, const char *s) { strncpy (d, s, strlen (s));} In the following example, the call to "strncpy" specifies the size of the destination buffer as the bound. Floating constant is out of range. Later compiler versions (starting with Studio 12 Update 1) follow the ABI used by other x86 targets, which is the default on Solaris 10 and later. Gnu++14 gnu++1y GNU dialect of -std=c++14. Skip to main content. Exception specification for implicitly declared virtual name1 is incompatible with that of overridden name2.
Wlto-type-mismatch During the link-time optimization warn about type mismatches in global declarations from different compilation units. FPIC is not presently supported with -mpcrel, though this could be supported for 68020 and higher processors. If you only want some of the stages of compilation, you can use -x (or filename suffixes) to tell gcc where to start, and one of the options -c, -S, or -E to say where gcc is to stop. Mror Generate code for hardware which supports rotate right instructions.
Wc11-c2x-compat (C and Objective-C only) Warn about features not present in ISO C11, but present in ISO C2X. The default cost model depends on other optimization flags and is either dynamic or cheap. In addition, the -dD option is implicitly enabled. Mauto-litpools -mno-auto-litpools These options control the treatment of literal pools. Code, initialized data and zero-initialized data are allocated consecutively.
Other options are passed on to one or more stages of processing. The "-Ocharacter string" option is invalid. If a feature has additional tuning options, then standard sets it to its standard level.