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‎docs/build/reference/og-global-optimizations.md‎

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---
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title: "/Og (Global Optimizations)"
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description: "Describes the deprecated MSVC compiler option /Og, formerly used to enable global optimizations."
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ms.date: 07/08/2020
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ms.date: 10/19/2021
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f1_keywords: ["VC.Project.VCCLCompilerTool.GlobalOptimizations", "/og"]
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helpviewer_keywords: ["-Og compiler option [C++]", "global optimizations compiler option [C++]", "automatic register allocation", "/Og compiler option [C++]", "loop structures, optimizing", "common subexpression elimination", "Og compiler option [C++]"]
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- Automatic register allocation
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This optimization allows the compiler to store frequently used variables and subexpressions in registers; the **`register`** keyword is ignored.
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This optimization allows the compiler to store frequently used variables and subexpressions in registers. The **`register`** keyword is ignored by default, and causes a diagnostic under **`/std:c++17`** or later.
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- Loop optimization
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‎docs/c-language/register-storage-class-specifier.md‎

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---
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description: "Learn more about: register Storage-Class Specifier"
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title: "register Storage-Class Specifier"
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ms.date: "11/04/2016"
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description: "Learn more about: register storage-class specifier"
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title: "register storage-class specifier"
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ms.date: 10/19/2021
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helpviewer_keywords: ["register variables", "register storage class"]
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ms.assetid: 7577bf48-88ec-4191-873c-ef4217a4034e
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---
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# register Storage-Class Specifier
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# `register` storage-class specifier
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**Microsoft Specific**
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The Microsoft C/C++ compiler does not honor user requests for register variables. However, for portability all other semantics associated with the **`register`** keyword are honored by the compiler. For example, you cannot apply the unary address-of operator (**&**) to a register object nor can the **`register`** keyword be used on arrays.
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The Microsoft C/C++ compiler doesn't honor user requests for register variables. However, for portability all other semantics associated with the **`register`** keyword are honored by the compiler. For example, you can't apply the unary address-of operator (**`&`**) to a register object nor can the **`register`** keyword be used on arrays.
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**END Microsoft Specific**
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## See also
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[Storage-Class Specifiers for Internal-Level Declarations](../c-language/storage-class-specifiers-for-internal-level-declarations.md)
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[Storage-class specifiers for internal-level declarations](../c-language/storage-class-specifiers-for-internal-level-declarations.md)

‎docs/cpp/storage-classes-cpp.md‎

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---
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title: "Storage classes (C++)"
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description: "In C++, the static, extern and thread_local keywords specify the lifetime, linkage, and memory location of a variable or function."
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ms.date: "12/11/2019"
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ms.date: 10/19/2021
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f1_keywords: ["thread_local_cpp", "static_cpp", "register_cpp"]
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helpviewer_keywords: ["storage classes [C++], basic concepts"]
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A *storage class* in the context of C++ variable declarations is a type specifier that governs the lifetime, linkage, and memory location of objects. A given object can have only one storage class. Variables defined within a block have automatic storage unless otherwise specified using the **`extern`**, **`static`**, or **`thread_local`** specifiers. Automatic objects and variables have no linkage; they are not visible to code outside the block. Memory is allocated for them automatically when execution enters the block and de-allocated when the block is exited.
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**Notes**
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## Notes
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1. The [mutable](../cpp/mutable-data-members-cpp.md) keyword may be considered a storage class specifier. However, it is only available in the member list of a class definition.
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- The [`mutable`](../cpp/mutable-data-members-cpp.md) keyword may be considered a storage class specifier. However, it is only available in the member list of a class definition.
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1. **Visual Studio 2010 and later:** The **`auto`** keyword is no longer a C++ storage-class specifier, and the **`register`** keyword is deprecated. **Visual Studio 2017 version 15.7 and later:** (available in [`/std:c++17`](../build/reference/std-specify-language-standard-version.md) mode and later): The **`register`** keyword is removed from the C++ language.
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- **Visual Studio 2010 and later:** The **`auto`** keyword is no longer a C++ storage-class specifier, and the **`register`** keyword is deprecated. **Visual Studio 2017 version 15.7 and later:** (available in [`/std:c++17`](../build/reference/std-specify-language-standard-version.md) mode and later): The **`register`** keyword is removed from the C++ language. Its use causes a diagnostic message:
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```cpp
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register int val; // warning C5033: 'register' is no longer a supported storage class
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```
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```cpp
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// c5033.cpp
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// compile by using: cl /c /std:c++17 c5033.cpp
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register int value; // warning C5033: 'register' is no longer a supported storage class
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```
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## <a name="static"></a> `static`
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## <a name="register"></a> register
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**Visual Studio 2017 version 15.3 and later** (available in [`/std:c++17`](../build/reference/std-specify-language-standard-version.md) mode and later): The **`register`** keyword is no longer a supported storage class. The keyword is still reserved in the standard for future use.
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**Visual Studio 2017 version 15.3 and later** (available in [`/std:c++17`](../build/reference/std-specify-language-standard-version.md) mode and later): The **`register`** keyword is no longer a supported storage class. Its use causes a diagnostic. The keyword is still reserved in the standard for future use.
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```cpp
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register int val; // warning C5033: 'register' is no longer a supported storage class

‎docs/error-messages/compiler-warnings/c5033.md‎

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---
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title: "Compiler Warning C5033"
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description: Describes the causes and fixes for compiler warning C5033.
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ms.date: 05/03/2021
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f1_keywords: ["C5033"]
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helpviewer_keywords: ["C5033"]
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---
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# Compiler Warning (Level 1) C5033
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> '*storage-class-keyword*' is no longer a supported storage class
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Certain storage class keywords have been deprecated or removed from the C++ language.
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## Remarks
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**Visual Studio 2010 and later:** In C++11, the **`auto`** keyword is no longer a C++ storage-class specifier, and the **`register`** keyword is deprecated.
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**Visual Studio 2017 version 15.7 and later:** (available in [`/std:c++17`](../build/reference/std-specify-language-standard-version.md) mode and later): The **`register`** keyword is removed from the C++ language in C++17 and later standards.
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The C++ standard defines an original and a revised meaning for the **`auto`** keyword. Before C++11, the **`auto`** keyword declares a variable in the *automatic* storage class; that is, a variable that has a local lifetime. Starting in C++11, the **`auto`** keyword declares a variable whose type is deduced from the initialization expression in its declaration. For backward compatibility, you can use the [`/Zc:auto`](../../build/reference/zc-auto-deduce-variable-type.md) compiler option to control the meaning of the **`auto`** keyword.
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The **`register`** keyword was originally meant as a suggestion to the compiler to place a variable in a register. The keyword was routinely ignored by compilers. Instead, compilers control whether variables are placed in registers to satisfy calling conventions and optimization levels. The **`register`** keyword is reserved in the standard for future use.
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## Example
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```cpp
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// c5033.cpp
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// compile by using: cl /c /std:c++17 c5033.cpp
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register int value; // warning C5033: 'register' is no longer a supported storage class
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```
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To fix this issue, remove the **`register`** storage-class specifier keyword.
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## See also
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[Storage class](../../cpp/storage-classes-cpp.md)

‎docs/error-messages/compiler-warnings/compiler-warning-level-4-c4710.md‎

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description: "Learn more about: Compiler Warning (level 4) C4710"
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title: "Compiler Warning (level 4) C4710"
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ms.date: "11/04/2016"
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ms.date: 10/19/2021
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f1_keywords: ["C4710"]
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helpviewer_keywords: ["C4710"]
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---
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# Compiler Warning (level 4) C4710
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'function' : function not inlined
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> '*function*' : function not inlined
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The given function was selected for inline expansion, but the compiler did not perform the inlining.
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The specified function was marked for inline expansion, but the compiler didn't inline the function.
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Inlining is performed at the compiler's discretion. The **`inline`** keyword, like the **`register`** keyword, is used as a hint for the compiler. The compiler uses heuristics to determine if it should inline a particular function to speed up the code when compiling for speed, or if it should inline a particular function to make the code smaller when compiling for space. The compiler will only inline very small functions when compiling for space.
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Inlining is done at the compiler's discretion. The **`inline`** keyword, like the deprecated (and, in C++17 and later standards, removed) **`register`** keyword, is used as a hint for the compiler. The compiler uses heuristics to determine if it should inline a particular function to speed up the code when it optimizes for speed, or if it should inline a particular function to make the code smaller when it optimizes for space. The compiler inlines only the smallest functions when compiling for space.
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In some cases, the compiler will not inline a particular function for mechanical reasons. See [C4714](../../error-messages/compiler-warnings/compiler-warning-level-4-c4714.md) for a list of reasons the compiler may not inline a function.
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In some cases, the compiler doesn't inline a particular function for mechanical reasons. See [C4714](../../error-messages/compiler-warnings/compiler-warning-level-4-c4714.md) for a list of reasons the compiler may not inline a function.
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This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
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This warning is off by default. For more information, see [Compiler warnings that are off by default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).

‎docs/error-messages/compiler-warnings/compiler-warnings-c4800-through-c4999.md‎

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title: "Compiler warnings C4800 Through C5999"
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description: "Table of Microsoft C/C++ compiler warnings C4800 through C5999."
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ms.date: 08/09/2021
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f1_keywords: ["C4808", "C4809", "C4825", "C4827", "C4837", "C4842", "C4844", "C4845", "C4846", "C4847", "C4848", "C4854", "C4855", "C4856", "C4857", "C4872", "C4880", "C4881", "C4882", "C4916", "C4921", "C4934", "C4954", "C4955", "C4963", "C4966", "C4970", "C4971", "C4973", "C4974", "C4981", "C4987", "C4988", "C4989", "C4990", "C4991", "C4992", "C4998", "C5022", "C5023", "C5024", "C5025", "C5026", "C5027", "C5028", "C5029", "C5030", "C5031", "C5032", "C5033", "C5034", "C5035", "C5036", "C5039", "C5040", "C5041", "C5042", "C5043", "C5044", "C5047", "C5048", "C5049", "C5051", "C5052", "C5053", "C5054", "C5055", "C5056", "C5057", "C5058", "C5059", "C5060", "C5061", "C5062", "C5063", "C5100", "C5101", "C5102", "C5103", "C5104", "C5106", "C5107", "C5108", "C5200", "C5201", "C5202", "C5203", "C5204", "C5205", "C5206", "C5207", "C5209", "C5210", "C5211", "C5212", "C5213", "C5214", "C5215", "C5216", "C5217", "C5218", "C5219", "C5220", "C5221", "C5222", "C5223", "C5224", "C5225", "C5226", "C5227", "C5228", "C5229", "C5230", "C5231", "C5232", "C5233", "C5234", "C5235", "C5236", "C5237", "C5238", "C5239", "C5240", "C5241", "C5242", "C5244", "C5245", "C5246", "C5249", "C5250"]
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helpviewer_keywords: ["C4808", "C4809", "C4825", "C4827", "C4837", "C4842", "C4844", "C4845", "C4846", "C4847", "C4848", "C4854", "C4855", "C4856", "C4857", "C4872", "C4880", "C4881", "C4882", "C4916", "C4921", "C4934", "C4954", "C4955", "C4963", "C4966", "C4970", "C4971", "C4973", "C4974", "C4981", "C4987", "C4988", "C4989", "C4990", "C4991", "C4992", "C4998", "C5022", "C5023", "C5024", "C5025", "C5026", "C5027", "C5028", "C5029", "C5030", "C5031", "C5032", "C5033", "C5034", "C5035", "C5036", "C5039", "C5040", "C5041", "C5042", "C5043", "C5044", "C5047", "C5048", "C5049", "C5051", "C5052", "C5053", "C5054", "C5055", "C5056", "C5057", "C5058", "C5059", "C5060", "C5061", "C5062", "C5063", "C5100", "C5101", "C5102", "C5103", "C5104", "C5106", "C5107", "C5108", "C5200", "C5201", "C5202", "C5203", "C5204", "C5205", "C5206", "C5207", "C5209", "C5210", "C5211", "C5212", "C5213", "C5214", "C5215", "C5216", "C5217", "C5218", "C5219", "C5220", "C5221", "C5222", "C5223", "C5224", "C5225", "C5226", "C5227", "C5228", "C5229", "C5230", "C5231", "C5232", "C5233", "C5234", "C5235", "C5236", "C5237", "C5238", "C5239", "C5240", "C5241", "C5242", "C5244", "C5245", "C5246", "C5249", "C5250"]
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ms.date: 10/19/2021
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f1_keywords: ["C4808", "C4809", "C4825", "C4827", "C4837", "C4842", "C4844", "C4845", "C4846", "C4847", "C4848", "C4854", "C4855", "C4856", "C4857", "C4872", "C4880", "C4881", "C4882", "C4916", "C4921", "C4934", "C4954", "C4955", "C4963", "C4966", "C4970", "C4971", "C4973", "C4974", "C4981", "C4987", "C4988", "C4989", "C4990", "C4991", "C4992", "C4998", "C5022", "C5023", "C5024", "C5025", "C5026", "C5027", "C5028", "C5029", "C5030", "C5031", "C5032", "C5034", "C5035", "C5036", "C5039", "C5040", "C5041", "C5042", "C5043", "C5044", "C5047", "C5048", "C5049", "C5051", "C5052", "C5053", "C5054", "C5055", "C5056", "C5057", "C5058", "C5059", "C5060", "C5061", "C5062", "C5063", "C5100", "C5101", "C5102", "C5103", "C5104", "C5106", "C5107", "C5108", "C5200", "C5201", "C5202", "C5203", "C5204", "C5205", "C5206", "C5207", "C5209", "C5210", "C5211", "C5212", "C5213", "C5214", "C5215", "C5216", "C5217", "C5218", "C5219", "C5220", "C5221", "C5222", "C5223", "C5224", "C5225", "C5226", "C5227", "C5228", "C5229", "C5230", "C5231", "C5232", "C5233", "C5234", "C5235", "C5236", "C5237", "C5238", "C5239", "C5240", "C5241", "C5242", "C5244", "C5245", "C5246", "C5249", "C5250"]
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helpviewer_keywords: ["C4808", "C4809", "C4825", "C4827", "C4837", "C4842", "C4844", "C4845", "C4846", "C4847", "C4848", "C4854", "C4855", "C4856", "C4857", "C4872", "C4880", "C4881", "C4882", "C4916", "C4921", "C4934", "C4954", "C4955", "C4963", "C4966", "C4970", "C4971", "C4973", "C4974", "C4981", "C4987", "C4988", "C4989", "C4990", "C4991", "C4992", "C4998", "C5022", "C5023", "C5024", "C5025", "C5026", "C5027", "C5028", "C5029", "C5030", "C5031", "C5032", "C5034", "C5035", "C5036", "C5039", "C5040", "C5041", "C5042", "C5043", "C5044", "C5047", "C5048", "C5049", "C5051", "C5052", "C5053", "C5054", "C5055", "C5056", "C5057", "C5058", "C5059", "C5060", "C5061", "C5062", "C5063", "C5100", "C5101", "C5102", "C5103", "C5104", "C5106", "C5107", "C5108", "C5200", "C5201", "C5202", "C5203", "C5204", "C5205", "C5206", "C5207", "C5209", "C5210", "C5211", "C5212", "C5213", "C5214", "C5215", "C5216", "C5217", "C5218", "C5219", "C5220", "C5221", "C5222", "C5223", "C5224", "C5225", "C5226", "C5227", "C5228", "C5229", "C5230", "C5231", "C5232", "C5233", "C5234", "C5235", "C5236", "C5237", "C5238", "C5239", "C5240", "C5241", "C5242", "C5244", "C5245", "C5246", "C5249", "C5250"]
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# Compiler warnings C4800 through C5999
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| Compiler warning (level 3) C5030 | attribute '*attribute-name*' is not recognized |
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| Compiler warning (level 4) C5031 | `#pragma warning(pop)`: likely mismatch, popping warning state pushed in different file |
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| Compiler warning (level 4) C5032 | detected `#pragma warning(push)` with no corresponding `#pragma warning(pop)` |
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| Compiler warning (level 1) C5033 | '*storage-class*' is no longer a supported storage class |
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| [Compiler warning (level 1) C5033](c5033.md) | '*storage-class*' is no longer a supported storage class |
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| Compiler warning C5034 | use of intrinsic '*intrinsic*' causes function *function-name* to be compiled as guest code |
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| Compiler warning C5035 | use of feature '*feature*' causes function *function-name* to be compiled as guest code |
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| Compiler warning (level 1) C5036 | varargs function pointer conversion when compiling with `/hybrid:x86arm64` '*type1*' to '*type2*' |

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