By William von Hagen
ISBN-10: 1590595858
ISBN-13: 9781590595855
The GNU Compiler assortment (GCC) deals quite a few compilers for quite a few programming languages, together with C, C++, Java, Fortran, and Ada. The Definitive consultant to GCC, moment version, has been revised to mirror the adjustments made within the most modern significant GCC liberate, model four. delivering in-depth guide to GCC's huge, immense array of gains and ideas, and introducing the most important instruments comparable to autoconf, gprof, and libtool, novices and specialists alike will have fun with utilizing this publication as either a consultant and reference for years yet to come.
However this publication is going way past a normal advent, introducing key programming recommendations, similar to profiling and optimization that after utilized in conjunction with GCC's complicated beneficial properties can vastly enhance program functionality. additionally, for you to account for the growing to be acclaim for GCC's different language compilers, the second one variation has been elevated to supply insurance for C++, Java, Fortran and Ada.
Newly multiplied and revised, The Definitive consultant to GCC, moment version will turn out to be a useful source for either scholars looking to develop into additional familiar with this important developer's device in addition to for specialists who use GCC on a regular basis.
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Extra resources for The Definitive Guide to GCC
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If the macro contains nested loops, a goto can be useful for breaking out of them. However, an ordinary label whose scope is the whole function cannot be used; if the macro can be expanded several times in one function, the label will be multiplydefined in that function. Local labels avoid this problem: #define SEARCH(array, target) ({ __label__ found; typeof (target) _SEARCH_target = (target); typeof (*(array)) *_SEARCH_array = (array); int i, j; int value; for (i = 0; i < max; i++) for (j = 0; j < max; j++) if (_SEARCH_array[i][j] == _SEARCH_target) { value = i; goto found; } value = -1; found: value; }) \ \ \ \ \ \ \ \ \ \ \ \ \ \ Labels As Values You can get the address of a label defined in a current function using the operator && (a unary operator, for you language lawyers).
On x86 systems, the stdcall attribute causes the compiler to assume that the function that is being called will clean up the stack space used to pass arguments. The function attribute unused means that it might not be used and that this is acceptable. Accordingly, GCC will omit producing a warning for this function. Likewise, the used function attribute declares that code must be emitted for the function even if it appears that the function is never referenced. This is useful, for example, when the function is referenced only in inline assembly.
You normally get these benefits for free because gcc uses its own versions of, say, alloca() or memcpy() instead of those defined in the standard C libraries. Invoking the -fno-builtin option disables this behavior. The GCC info pages document the complete list of gcc’s built-in functions. The -ansi and -std options, which force varying degrees of stricter adherence to published C standards documents, imply -fno-builtin. As Table 1-1 indicates, -ansi causes gcc to support all features of ISO C89 and turns off GNU extensions that conflict with this standard.