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‎404.html‎

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<meta charset="UTF-8">
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<meta name="generator" content="Docusaurus v3.6.3">
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<title data-rh="true">Page Not Found | ELP</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://whatsapp.github.io/erlang-language-platform/404.html/"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docusaurus_tag" content="default"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docsearch:docusaurus_tag" content="default"><meta data-rh="true" property="og:title" content="Page Not Found | ELP"><link data-rh="true" rel="icon" href="/erlang-language-platform/img/elp_icon_color.svg"><link data-rh="true" rel="canonical" href="https://whatsapp.github.io/erlang-language-platform/404.html/"><link data-rh="true" rel="alternate" href="https://whatsapp.github.io/erlang-language-platform/404.html/" hreflang="en"><link data-rh="true" rel="alternate" href="https://whatsapp.github.io/erlang-language-platform/404.html/" hreflang="x-default"><link rel="stylesheet" href="/erlang-language-platform/assets/css/styles.94ca9faf.css">
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<script src="/erlang-language-platform/assets/js/runtime~main.c35cfb82.js" defer="defer"></script>
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<script src="/erlang-language-platform/assets/js/main.48eff399.js" defer="defer"></script>
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</head>
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<body class="navigation-with-keyboard">
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<script>!function(){function t(t){document.documentElement.setAttribute("data-theme",t)}var e=function(){try{return new URLSearchParams(window.location.search).get("docusaurus-theme")}catch(t){}}()||function(){try{return window.localStorage.getItem("theme")}catch(t){}}();t(null!==e?e:"light")}(),function(){try{const n=new URLSearchParams(window.location.search).entries();for(var[t,e]of n)if(t.startsWith("docusaurus-data-")){var a=t.replace("docusaurus-data-","data-");document.documentElement.setAttribute(a,e)}}catch(t){}}()</script>

‎_src/erlang-error-index/w/W0057.md‎

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---
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sidebar_position: 57
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---
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# W0057 - Undefined macro
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## Error
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```erlang
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-module(example).
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foo() ->
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?UNDEFINED_MACRO.
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%% ^^^^^^^^^^^^^^^^ error: W0057: undefined macro 'UNDEFINED_MACRO'
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bar(X) ->
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?UNDEFINED_WITH_ARGS(X, 42).
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%% ^^^^^^^^^^^^^^^^^^^^ error: W0057: undefined macro 'UNDEFINED_WITH_ARGS/2'
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```
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This diagnostic is triggered when a macro usage cannot be resolved in ELP native
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diagnostic processing. The macro is referenced in the code but has not been defined
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in the current file or any included header files.
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**Important:** This diagnostic corresponds to Erlang service diagnostics
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**E1507** (for macros without arguments) and **E1508** (for macros with
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arguments). W0057 only appears when the corresponding Erlang service diagnostic
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does not appear. If you see W0057 in a Buck project, it is likely a sign that
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the project is not defined properly in your TARGETS/BUCK file.
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## Common Causes
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1. **Missing macro definition**: The macro has not been defined with
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`-define()`.
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2. **Missing include file**: The macro is defined in a header file that has not
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been included.
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3. **Typo in macro name**: The macro name is misspelled.
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4. **Conditional compilation**: The macro is defined within a conditional block
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(e.g., `-ifdef()`) that is not active.
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## Fix
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### Define the macro
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If the macro is not defined anywhere, add a `-define()` directive:
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```erlang
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-module(example).
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-define(UNDEFINED_MACRO, 42).
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-define(UNDEFINED_WITH_ARGS(X, Y), X + Y).
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foo() ->
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?UNDEFINED_MACRO.
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bar(X) ->
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?UNDEFINED_WITH_ARGS(X, 42).
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```
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### Include the header file
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If the macro is defined in a header file, add the appropriate `-include()` or
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`-include_lib()` directive:
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```erlang
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-module(example).
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-include("macros.hrl").
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foo() ->
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?UNDEFINED_MACRO.
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```
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### Fix typos
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If the macro name is misspelled, correct it to match the definition:
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```erlang
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-module(example).
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-define(DEFINED_MACRO, 42).
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foo() ->
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?DEFINED_MACRO. % Fixed typo
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```
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## Relationship to Erlang Service Diagnostics
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W0057 is filtered out when the Erlang service reports the corresponding
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diagnostics:
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- **E1507**: undefined macro (without arguments)
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- **E1508**: undefined macro (with arguments)
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When both diagnostics detect the same issue, only the Erlang service diagnostic
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will be shown to avoid duplication.
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## Buck Project Configuration
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If you see W0057 in a Buck project, this typically indicates that your TARGETS
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file is not properly configured. The Erlang service relies on Buck to understand
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the project structure, dependencies, and include paths. Check that:
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- All application dependencies are declared in the `deps` attribute
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- Include paths are properly configured
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- The macro definition is in an accessible dependency

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‎assets/js/dca304ba.8c20e279.js‎

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