Dev C You Have Not Enabled Debugging Info Windows 7 I want to be able to step through the code, and watch the variables number1 and number2 but, when I add breakpoints, execute the code and then hover over the variables with the cursor, it reports 'number1 = Not found in current context' in the Debug window towards the left. Ah hah, that means you got the Insight setup and working properly but somehow the Dev-C does not include debugging info in your compiled exe. What version of Dev-C you got, did you go to Tools -Check for updates/packages and after you connect to the devpark.org listing, check to see in the Installed package if you have the latest ones.

Jun 11, 2020 Autoplay When autoplay is enabled, a suggested video will automatically play next. Up next How to Download Dev C and Install and Run program - Duration: 6:22. How do I debug using Dev-C? First, make sure you are using a project. Then go to Project Options - Compiler - Linker and set Generate debugging information to 'yes', and make sure you are not using any optimization options (they're not good for debug mode).

Note that about:debugging is not enabled by default in Firefox ESR. To enable it, open the Configuration Editor ( about:config ) and set devtools.aboutdebugging.new-enabled to true. If you used a higher version of Firefox prior to installing Firefox ESR, you will be prompted to create a new user profile, in order to protect your user data. If DWARF debugging information is enabled, separate as much debugging information as possible into a separate output file with the extension.dwo. This option allows the build system to avoid linking files with debug information. To be useful, this option requires a debugger capable of reading.dwo files. Jun 23, 2017 In this C tutorial, you learned the basics of debugging including when you might need to debug (like when a function is not providing the expected results), the difference between stand-alone and integrated debuggers (integrated debuggers are part of an IDE and might be easier to use), and common debugger features.

Accessing the In-App Developer Menu#

You can access the developer menu by shaking your device or by selecting 'Shake Gesture' inside the Hardware menu in the iOS Simulator. You can also use the ⌘D keyboard shortcut when your app is running in the iOS Simulator, or ⌘M when running in an Android emulator on Mac OS and Ctrl+M on Windows and Linux. Alternatively for Android, you can run the command adb shell input keyevent 82 to open the dev menu (82 being the Menu key code).

The Developer Menu is disabled in release (production) builds.

Enabling Fast Refresh#

Fast Refresh is a React Native feature that allows you to get near-instant feedback for changes in your React components. While debugging, it can help to have Fast Refresh enabled. Fast Refresh is enabled by default, and you can toggle 'Enable Fast Refresh' in the React Native developer menu. When enabled, most of your edits should be visible within a second or two.

Enabling Keyboard Shortcuts#

React Native supports a few keyboard shortcuts in the iOS Simulator. They are described below. To enable them, open the Hardware menu, select Keyboard, and make sure that 'Connect Hardware Keyboard' is checked.

LogBox#

Errors and warnings in development builds are displayed in LogBox inside your app.

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LogBox is automatically disabled in release (production) builds.

Console Errors and Warnings#

Ez-writer drivers for mac. Console errors and warnings are displayed as on-screen notifications with a red or yellow badge, and the number of errors or warning in the console respectively. To view a console error or warnings, tap the notification to view the full screen information about the log and to paginiate through all of the logs in the console.

These notifications can be hidden using LogBox.ignoreAllLogs(). This is useful when giving product demos, for example. Additionally, notifications can be hidden on a per-log basis via LogBox.ignoreLogs(). This is useful when there's a noisy warning that cannot be fixed, like those in a third-party dependency.

Ignore logs as a last resort and create a task to fix any logs that are ignored.

Unhandled Errors#

Unhanded JavaScript errors such as undefined is not a function will automatically open a full screen LogBox error with the source of the error. These errors are dismissable and minimizable so that you can see the state of your app when these errors occur, but should always be addressed.

Syntax Errors#

Syntax errors will automatically open a full screen LogBox error with the source of the syntax error. This error is not dismissable because it represents invalid JavaScript execution that must be fixed before continuing with your app. To dismiss these errors, fix the syntax error and either save to automatically dismiss (with Fast Refresh enabled) or cmd+r to reload (with Fast Refresh disabled).

Chrome Developer Tools#

To debug the JavaScript code in Chrome, select 'Debug JS Remotely' from the Developer Menu. This will open a new tab at http://localhost:8081/debugger-ui.

Select Tools → Developer Tools from the Chrome Menu to open the Developer Tools. You may also access the DevTools using keyboard shortcuts (⌘⌥I on macOS, CtrlShiftI on Windows). You may also want to enable Pause On Caught Exceptions for a better debugging experience.

Note: the React Developer Tools Chrome extension does not work with React Native, but you can use its standalone version instead. Read this section to learn how.

Debugging using a custom JavaScript debugger#

To use a custom JavaScript debugger in place of Chrome Developer Tools, set the REACT_DEBUGGER environment variable to a command that will start your custom debugger. You can then select 'Debug JS Remotely' from the Developer Menu to start debugging.

The debugger will receive a list of all project roots, separated by a space. For example, if you set REACT_DEBUGGER='node /path/to/launchDebugger.js --port 2345 --type ReactNative', then the command node /path/to/launchDebugger.js --port 2345 --type ReactNative /path/to/reactNative/app will be used to start your debugger.

Custom debugger commands executed this way should be short-lived processes, and they shouldn't produce more than 200 kilobytes of output.

Safari Developer Tools#

You can use Safari to debug the iOS version of your app without having to enable 'Debug JS Remotely'.

• Enable Develop menu in Safari: Preferences → Advanced → Select 'Show Develop menu in menu bar'
• Select your app's JSContext: Develop → Simulator → JSContext
• Safari's Web Inspector should open which has a Console and a Debugger

While sourcemaps may not be enabled by default, you can follow this guide or video to enable them and set break points at the right places in the source code.

However, every time the app is reloaded (using live reload, or by manually reloading), a new JSContext is created. Choosing 'Automatically Show Web Inspectors for JSContexts' saves you from having to select the latest JSContext manually.

React Developer Tools#

You can use the standalone version of React Developer Tools to debug the React component hierarchy. To use it, install the react-devtools package globally:

Note: Version 4 of react-devtools requires react-native version 0.62 or higher to work properly.

Now run react-devtools from the terminal to launch the standalone DevTools app:

It should connect to your simulator within a few seconds.

Note: if you prefer to avoid global installations, you can add react-devtools as a project dependency. Add the react-devtools package to your project using npm install --save-dev react-devtools, then add 'react-devtools': 'react-devtools' to the scripts section in your package.json, and then run npm run react-devtools from your project folder to open the DevTools.

Integration with React Native Inspector#

Open the in-app developer menu and choose 'Toggle Inspector'. It will bring up an overlay that lets you tap on any UI element and see information about it:

However, when react-devtools is running, Inspector will enter a collapsed mode, and instead use the DevTools as primary UI. In this mode, clicking on something in the simulator will bring up the relevant components in the DevTools:

You can choose 'Toggle Inspector' in the same menu to exit this mode.

Inspecting Component Instances#

When debugging JavaScript in Chrome, you can inspect the props and state of the React components in the browser console.

First, follow the instructions for debugging in Chrome to open the Chrome console.

Make sure that the dropdown in the top left corner of the Chrome console says debuggerWorker.js. This step is essential.

Then select a React component in React DevTools. There is a search box at the top that helps you find one by name. As soon as you select it, it will be available as $r in the Chrome console, letting you inspect its props, state, and instance properties.

Performance Monitor#

You can enable a performance overlay to help you debug performance problems by selecting 'Perf Monitor' in the Developer Menu.

Debugging Application State#

Reactotron is an open-source desktop app that allows you to inspect Redux or MobX-State-Tree application state as well as view custom logs, run custom commands such as resetting state, store and restore state snapshots, and other helpful debugging features for React Native apps.

You can view installation instructions in the README. If you're using Expo, here is an article detailing how to install on Expo.

Projects with Native Code Only

The following section only applies to projects with native code exposed. If you are using the managed expo-cli workflow, see the guide on ejecting to use this API.

Accessing console logs#

You can display the console logs for an iOS or Android app by using the following commands in a terminal while the app is running:

You may also access these through Debug → Open System Log.. in the iOS Simulator or by running adb logcat *:S ReactNative:V ReactNativeJS:V in a terminal while an Android app is running on a device or emulator.

If you're using Create React Native App or Expo CLI, console logs already appear in the same terminal output as the bundler.

Debugging on a device with Chrome Developer Tools#

If you're using Create React Native App or Expo CLI, this is configured for you already.

On iOS devices, open the file RCTWebSocketExecutor.m and change 'localhost' to the IP address of your computer, then select 'Debug JS Remotely' from the Developer Menu.

On Android 5.0+ devices connected via USB, you can use the adb command line tool to setup port forwarding from the device to your computer:

adb reverse tcp:8081 tcp:8081

Alternatively, select 'Dev Settings' from the Developer Menu, then update the 'Debug server host for device' setting to match the IP address of your computer.

If you run into any issues, it may be possible that one of your Chrome extensions is interacting in unexpected ways with the debugger. Try disabling all of your extensions and re-enabling them one-by-one until you find the problematic extension.

Debugging native code#

When working with native code, such as when writing native modules, you can launch the app from Android Studio or Xcode and take advantage of the native debugging features (setting up breakpoints, etc.) as you would in case of building a standard native app.

Next: Optimize Options, Previous: Static Analyzer Options, Up: Invoking GCC [Contents][Index]

3.10 Options for Debugging Your Program

To tell GCC to emit extra information for use by a debugger, in almost all cases you need only to add -g to your other options.

GCC allows you to use -g with-O. The shortcuts taken by optimized code may occasionallybe surprising: some variables you declared may not existat all; flow of control may briefly move where you did not expect it;some statements may not be executed because they compute constantresults or their values are already at hand; some statements mayexecute in different places because they have been moved out of loops.Nevertheless it is possible to debug optimized output. This makesit reasonable to use the optimizer for programs that might have bugs.

If you are not using some other optimization option, considerusing -Og (see Optimize Options) with -g. With no -O option at all, some compiler passes that collectinformation useful for debugging do not run at all, so that-Og may result in a better debugging experience.

Produce debugging information in the operating system’s native format(stabs, COFF, XCOFF, or DWARF). GDB can work with this debugginginformation.

On most systems that use stabs format, -g enables use of extradebugging information that only GDB can use; this extra informationmakes debugging work better in GDB but probably makes other debuggerscrash orrefuse to read the program. If you want to control for certain whetherto generate the extra information, use -gstabs+, -gstabs,-gxcoff+, -gxcoff, or -gvms (see below).

Produce debugging information for use by GDB. This means to use themost expressive format available (DWARF, stabs, or the native formatif neither of those are supported), including GDB extensions if at allpossible.

Produce debugging information in DWARF format (if that is supported).The value of version may be either 2, 3, 4 or 5; the default versionfor most targets is 4. DWARF Version 5 is only experimental.

Note that with DWARF Version 2, some ports require and alwaysuse some non-conflicting DWARF 3 extensions in the unwind tables.

Version 4 may require GDB 7.0 and -fvar-tracking-assignmentsfor maximum benefit.

GCC no longer supports DWARF Version 1, which is substantiallydifferent than Version 2 and later. For historical reasons, someother DWARF-related options such as-fno-dwarf2-cfi-asm) retain a reference to DWARF Version 2in their names, but apply to all currently-supported versions of DWARF.

Produce debugging information in stabs format (if that is supported),without GDB extensions. This is the format used by DBX on most BSDsystems. On MIPS, Alpha and System V Release 4 systems this optionproduces stabs debugging output that is not understood by DBX.On System V Release 4 systems this option requires the GNU assembler.

Produce debugging information in stabs format (if that is supported),using GNU extensions understood only by the GNU debugger (GDB). Theuse of these extensions is likely to make other debuggers crash orrefuse to read the program.

Produce debugging information in XCOFF format (if that is supported).This is the format used by the DBX debugger on IBM RS/6000 systems.

Produce debugging information in XCOFF format (if that is supported),using GNU extensions understood only by the GNU debugger (GDB). Theuse of these extensions is likely to make other debuggers crash orrefuse to read the program, and may cause assemblers other than the GNUassembler (GAS) to fail with an error.

Produce debugging information in Alpha/VMS debug format (if that issupported). This is the format used by DEBUG on Alpha/VMS systems.

Request debugging information and also use level to specify howmuch information. The default level is 2.

Level 0 produces no debug information at all. Thus, -g0 negates-g.

Level 1 produces minimal information, enough for making backtraces inparts of the program that you don’t plan to debug. This includesdescriptions of functions and external variables, and line numbertables, but no information about local variables.

Level 3 includes extra information, such as all the macro definitionspresent in the program. Some debuggers support macro expansion whenyou use -g3.

If you use multiple -g options, with or without level numbers,the last such option is the one that is effective.

-gdwarf does not accept a concatenated debug level, to avoidconfusion with -gdwarf-level.Instead use an additional -glevel option to change thedebug level for DWARF.

By default, no debug information is produced for symbols that are not actuallyused. Use this option if you want debug information for all symbols.

Instead of emitting debugging information for a C++ class in only oneobject file, emit it in all object files using the class. This optionshould be used only with debuggers that are unable to handle the way GCCnormally emits debugging information for classes because using thisoption increases the size of debugging information by as much as afactor of two.

Direct the linker to not merge together strings in the debugginginformation that are identical in different object files. Merging isnot supported by all assemblers or linkers. Merging decreases the sizeof the debug information in the output file at the cost of increasinglink processing time. Merging is enabled by default.

When compiling files residing in directory old, recorddebugging information describing them as if the files resided indirectory new instead. This can be used to replace abuild-time path with an install-time path in the debug info. It canalso be used to change an absolute path to a relative path by using. for new. This can give more reproducible builds, whichare location independent, but may require an extra command to tell GDBwhere to find the source files. See also -ffile-prefix-map.

Run variable tracking pass. It computes where variables are stored at eachposition in code. Better debugging information is then generated(if the debugging information format supports this information).

It is enabled by default when compiling with optimization (-Os,-O, -O2, …), debugging information (-g) andthe debug info format supports it.

Annotate assignments to user variables early in the compilation andattempt to carry the annotations over throughout the compilation all theway to the end, in an attempt to improve debug information whileoptimizing. Use of -gdwarf-4 is recommended along with it.

It can be enabled even if var-tracking is disabled, in which caseannotations are created and maintained, but discarded at the end.By default, this flag is enabled together with -fvar-tracking,except when selective scheduling is enabled.

If DWARF debugging information is enabled, separate as much debugginginformation as possible into a separate output file with the extension.dwo. This option allows the build system to avoid linking files withdebug information. To be useful, this option requires a debugger capable ofreading .dwo files.

If DWARF debugging information is enabled, the -gdwarf32 selectsthe 32-bit DWARF format and the -gdwarf64 selects the 64-bitDWARF format. The default is target specific, on most targets it is-gdwarf32 though. The 32-bit DWARF format is smaller, butcan’t support more than 2GiB of debug information in any of the DWARFdebug information sections. The 64-bit DWARF format allows larger debuginformation and might not be well supported by all consumers yet.

Add description attributes to some DWARF DIEs that have no name attribute,such as artificial variables, external references and call siteparameter DIEs.

Generate DWARF .debug_pubnames and .debug_pubtypes sections.

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Generate .debug_pubnames and .debug_pubtypes sections in a formatsuitable for conversion into a GDB index. This option is only usefulwith a linker that can produce GDB index version 7.

When using DWARF Version 4 or higher, type DIEs can be put intotheir own .debug_types section instead of making them part of the.debug_info section. It is more efficient to put them in a separatecomdat section since the linker can then remove duplicates.But not all DWARF consumers support .debug_types sections yetand on some objects .debug_types produces larger instead of smallerdebugging information.

This switch causes the command-line options used to invoke thecompiler that may affect code generation to be appended to theDW_AT_producer attribute in DWARF debugging information. The optionsare concatenated with spaces separating them from each other and fromthe compiler version. It is enabled by default.See also -frecord-gcc-switches for anotherway of storing compiler options into the object file.

Disallow using extensions of later DWARF standard version than selectedwith -gdwarf-version. On most targets using non-conflictingDWARF extensions from later standard versions is allowed.

Allow using extensions of later DWARF standard version than selected with-gdwarf-version.

Inform the compiler that the assembler supports .loc directives.It may then use them for the assembler to generate DWARF2+ line numbertables.

This is generally desirable, because assembler-generated line-numbertables are a lot more compact than those the compiler can generateitself.

This option will be enabled by default if, at GCC configure time, theassembler was found to support such directives.

Force GCC to generate DWARF2+ line number tables internally, if DWARF2+line number tables are to be generated.

Inform the compiler that the assembler supports view assignmentand reset assertion checking in .loc directives.

This option will be enabled by default if, at GCC configure time, theassembler was found to support them.

Force GCC to assign view numbers internally, if-gvariable-location-views are explicitly requested.

Emit location column information into DWARF debugging information, ratherthan just file and line.This option is enabled by default.

This option causes GCC to create markers in the internal representationat the beginning of statements, and to keep them roughly in placethroughout compilation, using them to guide the output of is_stmtmarkers in the line number table. This is enabled by default whencompiling with optimization (-Os, -O, -O2,…), and outputting DWARF 2 debug information at the normal level.

Augment variable location lists with progressive view numbers impliedfrom the line number table. This enables debug information consumers toinspect state at certain points of the program, even if no instructionsassociated with the corresponding source locations are present at thatpoint. If the assembler lacks support for view numbers in line numbertables, this will cause the compiler to emit the line number table,which generally makes them somewhat less compact. The augmented linenumber tables and location lists are fully backward-compatible, so theycan be consumed by debug information consumers that are not aware ofthese augmentations, but they won’t derive any benefit from them either.

This is enabled by default when outputting DWARF 2 debug information atthe normal level, as long as there is assembler support,-fvar-tracking-assignments is enabled and-gstrict-dwarf is not. When assembler support is notavailable, this may still be enabled, but it will force GCC to outputinternal line number tables, and if-ginternal-reset-location-views is not enabled, that will mostcertainly lead to silently mismatching location views.

There is a proposed representation for view numbers that is not backwardcompatible with the location list format introduced in DWARF 5, that canbe enabled with -gvariable-location-views=incompat5. Thisoption may be removed in the future, is only provided as a referenceimplementation of the proposed representation. Debug informationconsumers are not expected to support this extended format, and theywould be rendered unable to decode location lists using it.

Attempt to determine location views that can be omitted from locationview lists. This requires the compiler to have very accurate insnlength estimates, which isn’t always the case, and it may causeincorrect view lists to be generated silently when using an assemblerthat does not support location view lists. The GNU assembler will flagany such error as a view number mismatch. This is only enabledon ports that define a reliable estimation function.

Generate extended debug information for inlined functions. Locationview tracking markers are inserted at inlined entry points, so thataddress and view numbers can be computed and output in debuginformation. This can be enabled independently of location views, inwhich case the view numbers won’t be output, but it can only be enabledalong with statement frontiers, and it is only enabled by default iflocation views are enabled.

Produce compressed debug sections in DWARF format, if that is supported.If type is not given, the default type depends on the capabilitiesof the assembler and linker used. type may be one of‘none’ (don’t compress debug sections), ‘zlib’ (use zlibcompression in ELF gABI format), or ‘zlib-gnu’ (use zlibcompression in traditional GNU format). If the linker doesn’t supportwriting compressed debug sections, the option is rejected. Otherwise,if the assembler does not support them, -gz is silently ignoredwhen producing object files.

Emit debug information for struct-like typesonly when the base name of the compilation source filematches the base name of file in which the struct is defined.

This option substantially reduces the size of debugging information,but at significant potential loss in type information to the debugger.See -femit-struct-debug-reduced for a less aggressive option.See -femit-struct-debug-detailed for more detailed control.

This option works only with DWARF debug output.

Emit debug information for struct-like typesonly when the base name of the compilation source filematches the base name of file in which the type is defined,unless the struct is a template or defined in a system header.

This option significantly reduces the size of debugging information,with some potential loss in type information to the debugger.See -femit-struct-debug-baseonly for a more aggressive option.See -femit-struct-debug-detailed for more detailed control.

This option works only with DWARF debug output.

Specify the struct-like typesfor which the compiler generates debug information.The intent is to reduce duplicate struct debug informationbetween different object files within the same program.

This option is a detailed version of-femit-struct-debug-reduced and -femit-struct-debug-baseonly,which serves for most needs.

A specification has the syntax
[‘dir:’ ‘ind:’][‘ord:’ ‘gen:’](‘any’ ‘sys’ ‘base’ ‘none’)

The optional first word limits the specification tostructs that are used directly (‘dir:’) or used indirectly (‘ind:’).A struct type is used directly when it is the type of a variable, member.Indirect uses arise through pointers to structs.That is, when use of an incomplete struct is valid, the use is indirect.An example is‘struct one direct; struct two * indirect;’.

The optional second word limits the specification toordinary structs (‘ord:’) or generic structs (‘gen:’).Generic structs are a bit complicated to explain.For C++, these are non-explicit specializations of template classes,or non-template classes within the above.Other programming languages have generics,but -femit-struct-debug-detailed does not yet implement them.

The third word specifies the source files for thosestructs for which the compiler should emit debug information.The values ‘none’ and ‘any’ have the normal meaning.The value ‘base’ means thatthe base of name of the file in which the type declaration appearsmust match the base of the name of the main compilation file.In practice, this means that when compiling foo.c, debug informationis generated for types declared in that file and foo.h,but not other header files.The value ‘sys’ means those types satisfying ‘base’or declared in system or compiler headers.

You may need to experiment to determine the best settings for your application.

The default is -femit-struct-debug-detailed=all.

This option works only with DWARF debug output.

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Emit DWARF unwind info as compiler generated .eh_frame sectioninstead of using GAS .cfi_* directives.

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Normally, when producing DWARF output, GCC avoids producing debug symbol output for types that are nowhere used in the source file being compiled.Sometimes it is useful to have GCC emit debugginginformation for all types declared in a compilationunit, regardless of whether or not they are actually usedin that compilation unit, for example if, in the debugger, you want to cast a value to a type that isnot actually used in your program (but is declared). More often,however, this results in a significant amount of wasted space.

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Next: Optimize Options, Previous: Static Analyzer Options, Up: Invoking GCC [Contents][Index]