gcc error variably modified at file scope Wade North Carolina

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gcc error variably modified at file scope Wade, North Carolina

At the end, before returning, the old value of SP is restored. I'm getting the following error when compiling: error: variably modified 'header' at file scope error: variably modified 'sequence' at file scope Code: struct list{ char header[list_header_size]; char sequence[list_sequence_size]; struct list *next; COLLECT_GCC=/usr/lib/gcc-snapshot/bin/gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc-snapshot/libexec/gcc/x86_64-linux-gnu/4.8.0/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 20121008-1' --with-bugurl=file:///usr/share/doc/gcc-snapshot/README.Bugs --enable-languages=c,ada,c++,java,go,fortran,objc,obj-c++ --prefix=/usr/lib/gcc-snapshot --enable-shared --enable-linker-build-id --with-system-zlib --disable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-snap/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-snap --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-snap --with-arch-directory=amd64 asked 1 year ago viewed 86 times Related 308How to get rid of `deprecated conversion from string constant to ‘char*’` warnings in GCC?975How do you check if a variable is an

My switches were set to "std=gnu99". He 'can' use const index declarations, including static const int a = 10; for example, at file scope. –WhozCraig Nov 30 '12 at 13:22 @WhozCraig : Really ? Is the NHS wrong about passwords? How to limit a xorg installation to a single video driver?

Join them; it only takes a minute: Sign up Variably modified array at file scope up vote 3 down vote favorite 1 What's wrong with the following code? #define DELAY_CYCLES ((int)(0.1/0.001)) I’m reporting this here by request of the Debian GCC Maintainers to decide whether this is, indeed, a bug in GCC, or whether applications cannot use this kind of compile-time check An important feature of VLA is that the variability can be used in all dimensions of a multidimensional array: double A[n1][n2]; double B[n2][n3]; double C[n1][n3]; . /* check that the sizes Didn't have to use any extra warning flags. –allanw Jan 25 '11 at 3:44 add a comment| Did you find this question interesting?

Powered by Redmine © 2006-2015 Jean-Philippe Lang How? share|improve this answer answered Nov 30 '12 at 13:14 zch 9,49211939 is a and b defined as int a = 6; int b = 3 instead of static int free(A); free(B); free(C); We might perhaps get yourself used to expressions such as (*A)[i1][i2], but if we keep clean spaces around arithmetic operators and assignments, this will not be too difficult

Anyone Understand how the chain rule was applied here? However, to be safe and 100% portable, you should change the definition of DELAY_CYCLES to avoid floating-point expressions. When casting a cube spell on a hex grid do you pick a honeycomb for origin or an intersection for origin? COLLECT_GCC=/usr/bin/gcc-4.6.real COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 4.6.3-10' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --with-arch-32=i586

Comment by Louis Herald -- June 10, 2014 @ 23:43 C++ and C simply are different programming languages. enum { L = 3 }; double A[L] = { 0 }; // valid, L is a constant integer expression double B[] = { 0.0, 0.0, 0.0 }; size_t const K In C, with the sole exception of floating-point constants cast to integers (such as (int)3.0f), floating-point expressions are not considered integer constant expressions at compile time for the purpose of array Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example).

arrays gcc indexing share|improve this question asked Jun 11 '15 at 11:42 A.Robert 11617 add a comment| active oldest votes Know someone who can answer? If Dumbledore is the most powerful wizard (allegedly), why would he work at a glorified boarding school? share|improve this answer edited Dec 26 '11 at 16:29 answered Dec 26 '11 at 16:21 pmg 69.2k782139 There are no "variably modified arrays" in C. What is the first movie to show this hard work message at the very end?

The main argument I see repeatedly is that they may cause stack overflow, SO, in case of errors or used with a large size. double (*A)[n1][n2] = malloc(sizeof(double[n1][n2])); double (*B)[n2][n3] = malloc(sizeof(double[n2][n3])); double (*C)[n1][n3] = malloc(sizeof(double[n1][n3])); . Format For Printing -XML -Clone This Bug -Top of page Home | New | Browse | Search | [?] | Reports | Help | NewAccount | Log In Remember [x] | A SO is a run time error that is very difficult to diagnose and to debug: A function when it is called usually receives its stack location through a special hardware

Not the answer you're looking for? C99 added Variable Length Arrays to the repertoire, but they can only appear inside a block or an argument list, where the size can be determined at runtime. Share this:ShareEmailPrintFacebookTwitter Related Comments (6) 6 Comments Great post! Unsubstantiated Can I release a pattern without releasing the whole held expression?

Success! How to handle a senior developer diva who seems unaware that his skills are obsolete? The following code was illegal either in block scope or file scope. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

Either way you should use static const variables instead of #defines whenever possible as the static const is type safe. Description Thorsten Glaser 2012-10-21 17:37:18 UTC Hi everyone, I’ve been using compile-time assertions, that is, compiling .c files with arrays that are either 1 or -1 bytes long, depending on some The implementations use stack-math to implement them. How should I interpret "English is poor" review when I used a language check service before submission?

In order not to be a variable length array, array sizes are required to be "integer constant expressions" (C99 §, and an "integer constant expression" is defined in §6.6/6 (emphasis mine): I know that similar questions have been asked before, but as far as I could find out, these involved actually using variables as index, at file scope. Now I get a weird error: expected ':', ',', ';', '}' or 'attribute' before '=' token ` int list_header_size = 200; int list_sequence_size = 2000; struct list{ char header = (char) If you used a C89 compiler, you might get a message about non-constant array dimensions.

Cast operators in an integer constant expression shall only convert arithmetic types to integer types, except as part of an operand to the sizeof operator. Why is absolute zero unattainable? I never knew before that VLA can be used this way. This is not very beautiful, lengthy and error prone.

Called as P99_ALEN(A) this does nothing spectacular, it evaluates to sizeof(A)/sizeof(A[0]). What is the first movie to show this hard work message at the very end? The transformation T on the set of all continuous functions that is defined by T(f) = f (1) is a linear transformation. Can Communism become a stable economic strategy?

for (size_t i1 = 0; i1 < n1) { for (size_t i3 = 0; i3 < n3) { (*C)[i1][i3] = 0.0; for (size_t i2 = 0; i2 < n2) (*C)[i1][i3] += Is there a Korean word for 'Syllable Block'? I know for a fact that the compilers i worked with do not store a "static const"variable at an adress but replace the use in the code by the very constant. You get both my up-vote, my answer deleted, and my apologies, sir. –WhozCraig Nov 30 '12 at 13:53 add a comment| up vote 5 down vote Simple answer variable modified array

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