Created by GNU Texinfo 7.0dev, http://www.gnu.org/software/texinfo/ Next: Built-in Functions Specific to Particular Target Machines , Previous: Object Size Checking , Up: Extensions to the C Language Family [ Contents ][ Index ] 6.59 Other Built-in Functions Provided by GCC ¶ GCC provides a large number of built-in functions other than the ones mentioned above. Some of these are for internal use in the processing of exceptions or variable-length argument lists and are not documented here be...

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Next: Preprocessor Options , Previous: Debugging Options , Up: Invoking GCC These options control various sorts of optimizations. Without any optimization option, the compiler's goal is to reduce the cost of compilation and to make debugging produce the expected results. Statements are independent: if you stop the program with a breakpoint between statements, you can then assign a new value to any variable or change the program counter to any other statement in the function and get exactly the results you expect from the source code. Turning on optimization flags makes the compiler attempt to improve the performance and/or code size at the expense of compilation time and possibly the ability to debug the program. The compiler performs optimization based on the knowledge it has of the program. Compiling multiple files at once to a single output file mode allows the compiler to...

Next: Constructing Calls , Previous: Labels as Values , Up: C Extensions A nested function is a function defined inside another function. Nested functions are supported as an extension in GNU C, but are not supported by GNU C++. The nested function's name is local to the block where it is defined. For example, here we define a nested function named square , and call it twice: foo (double a, double b) { double square (double z) { return z * z; } return square (a) + square (b); } The nested function can access all the variables of the containing function that are visible at the point of its definition. This is called lexical scoping . For example, here we show a nested function which uses an inherited variable named offset : bar (int *array, int offset, int size) { int access (int *array, int index) { return array[index + of...

Next: Constructing Calls , Previous: Labels as Values , Up: C Extensions A nested function is a function defined inside another function. Nested functions are supported as an extension in GNU C, but are not supported by GNU C++. The nested function's name is local to the block where it is defined. For example, here we define a nested function named square , and call it twice: foo (double a, double b) { double square (double z) { return z * z; } return square (a) + square (b); } The nested function can access all the variables of the containing function that are visible at the point of its definition. This is called lexical scoping . For example, here we show a nested function which uses an inherited variable named offset : bar (int *array, int offset, int size) { int access (int *array, int index) { return array[index + of...

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X-Body-Begin X-User-Header htdig_noindex This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project . /htdig_noindex X-User-Header-End X-TopPNI htdig_noindex Index Nav: [ Date Index ] [ Subject Index ] [ Author Index ] [ Thread Index ] Message Nav: [ Date Prev ] [ Date Next ] [ Thread Prev ] [ Thread Next ] Other format: [ Raw text ] /htdig_noindex X-TopPNI-End X-MsgBody X-Subject-Header-Begin X-Subject-Header-End X-Head-of-Message From : Fergus Henderson <fjh at cs dot mu dot OZ dot AU> To : gcc at gcc dot gnu dot org Date : Tue, 17 Sep 2002 19:59:10 +1000 Subject : sibcall/tailcall terminology X-Head-of-Message-End X-Head-Body-Sep-Begin X-Head-Body-Sep-End X-Body-of-Message Currently the GCC sources are rather confused/confusing with regard to the terminology used for the different kinds of tail recursion and sibling call optim...

Next: Preprocessor Options , Previous: Debugging Options , Up: Invoking GCC These options control various sorts of optimizations. Without any optimization option, the compiler's goal is to reduce the cost of compilation and to make debugging produce the expected results. Statements are independent: if you stop the program with a breakpoint between statements, you can then assign a new value to any variable or change the program counter to any other statement in the function and get exactly the results you expect from the source code. Turning on optimization flags makes the compiler attempt to improve the performance and/or code size at the expense of compilation time and possibly the ability to debug the program. The compiler performs optimization based on the knowledge it has of the program. Compiling multiple files at once to a single output file mode allows the compiler to...

GCC Wiki Search: Login Self Visibility HomePage RecentChanges FindPage HelpContents Visibility Immutable Page Comments Info Attachments More Actions: Raw Text Print View Render as Docbook Delete Cache ------------------------ Check Spelling Like Pages Local Site Map ------------------------ Rename Page Delete Page ------------------------ Subscribe User ------------------------ Remove Spam Revert to this revision Package Pages ------------------------ Load Save SlideShow Note: the text on this page was almost integrally written by Niall Douglas, the original author of the patch, and placed on nedprod.com . This is basically a local mirror (especially useful because the external website now appears to be down). Put simply, it hides most of the ELF symbols which would have previously (and unnecessarily) been public. This means: I...