From 95ee0740fbfb76c7e33c7d13f95b20d5dba37bde Mon Sep 17 00:00:00 2001 From: Rageking8 <106309953+Rageking8@users.noreply.github.com> Date: Tue, 22 Jul 2025 22:03:12 +0800 Subject: [PATCH 1/5] Add "Remarks" and "Example" headings in C4324 warning reference --- .../compiler-warnings/compiler-warning-level-4-c4324.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md index f2f4076e29..883f7ca180 100644 --- a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md +++ b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md @@ -9,8 +9,12 @@ helpviewer_keywords: ["C4324"] > '*structname*': structure was padded due to alignment specifier +## Remarks + Padding was added at the end of a structure because you specified an alignment specifier, such as [__declspec(align)](../../cpp/align-cpp.md). +## Example + For example, the following code generates C4324: ```cpp From 51f5892904b1f11563cb5043114be9359732d9d6 Mon Sep 17 00:00:00 2001 From: Rageking8 <106309953+Rageking8@users.noreply.github.com> Date: Tue, 22 Jul 2025 22:11:30 +0800 Subject: [PATCH 2/5] Update C4324 warning message --- .../compiler-warnings/compiler-warning-level-4-c4324.md | 2 +- .../compiler-warnings/compiler-warnings-c4200-through-c4399.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md index 883f7ca180..3d6858e59f 100644 --- a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md +++ b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md @@ -7,7 +7,7 @@ helpviewer_keywords: ["C4324"] --- # Compiler Warning (level 4) C4324 -> '*structname*': structure was padded due to alignment specifier +> '*type*': structure was padded due to alignment specifier ## Remarks diff --git a/docs/error-messages/compiler-warnings/compiler-warnings-c4200-through-c4399.md b/docs/error-messages/compiler-warnings/compiler-warnings-c4200-through-c4399.md index 08698aef3a..e2115eba56 100644 --- a/docs/error-messages/compiler-warnings/compiler-warnings-c4200-through-c4399.md +++ b/docs/error-messages/compiler-warnings/compiler-warnings-c4200-through-c4399.md @@ -113,7 +113,7 @@ The articles in this section describe Microsoft C/C++ compiler warning messages |Compiler warning (level 1) C4321|automatically generating an IID for interface '*interface*'| |Compiler warning (level 1) C4322|automatically generating a CLSID for class '*class*'| |Compiler warning (level 1) C4323|re-using registered CLSID for class '*class*'| -|[Compiler warning (level 4) C4324](compiler-warning-level-4-c4324.md)|'*structname*': structure was padded due to alignment specifier| +|[Compiler warning (level 4) C4324](compiler-warning-level-4-c4324.md)|'*type*': structure was padded due to alignment specifier| |[Compiler warning (level 1) C4325](compiler-warning-level-1-c4325.md)|attributes for standard section '*section*' ignored| |[Compiler warning (level 1) C4326](compiler-warning-level-1-c4326.md)|return type of '*function*' should be '*type1*' instead of '*type2*'| |Compiler warning C4327|'*assignment*': indirection alignment of LHS ('*alignment1*') is greater than RHS ('*alignment2*')| From f0aa1f53a5862e26692355fc13af9903abe2b13f Mon Sep 17 00:00:00 2001 From: Rageking8 <106309953+Rageking8@users.noreply.github.com> Date: Tue, 22 Jul 2025 22:16:55 +0800 Subject: [PATCH 3/5] Add details to remarks in C4324 warning reference --- .../compiler-warnings/compiler-warning-level-4-c4324.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md index 3d6858e59f..a7bb362f2e 100644 --- a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md +++ b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md @@ -11,7 +11,7 @@ helpviewer_keywords: ["C4324"] ## Remarks -Padding was added at the end of a structure because you specified an alignment specifier, such as [__declspec(align)](../../cpp/align-cpp.md). +Padding was added at the end of a class/struct/union because you specified an alignment specifier, such as [`alignas`](../../cpp/alignas-specifier.md) or [`__declspec(align)`](../../cpp/align-cpp.md). ## Example From ebbeb2497c913f46ba5fee01725f235614d718a5 Mon Sep 17 00:00:00 2001 From: Rageking8 <106309953+Rageking8@users.noreply.github.com> Date: Tue, 22 Jul 2025 22:37:23 +0800 Subject: [PATCH 4/5] Improve example in C4324 warning reference --- .../compiler-warning-level-4-c4324.md | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md index a7bb362f2e..effab81827 100644 --- a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md +++ b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md @@ -15,17 +15,21 @@ Padding was added at the end of a class/struct/union because you specified an al ## Example -For example, the following code generates C4324: +For example, `S1` and `S2` generates C4324 because padding is added when the specified alignment is greater than the default alignment of `1` and `4` respectively: ```cpp // C4324.cpp -// compile with: /W4 -struct __declspec(align(32)) A +// compile with: /W4 /c + +struct alignas(4) S1 {}; // C4324 + +struct alignas(8) S2 { - char a; + int i; }; // C4324 -int main() +struct alignas(4) S3 { -} + int i; +}; // OK ``` From 683a6350d2623b00fa8a88c08c58e37489632715 Mon Sep 17 00:00:00 2001 From: Rageking8 <106309953+Rageking8@users.noreply.github.com> Date: Tue, 22 Jul 2025 22:38:21 +0800 Subject: [PATCH 5/5] Update metadata in C4324 warning reference --- .../compiler-warnings/compiler-warning-level-4-c4324.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md index effab81827..5aed86571e 100644 --- a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md +++ b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4324.md @@ -1,7 +1,7 @@ --- -description: "Learn more about: Compiler Warning (level 4) C4324" title: "Compiler Warning (level 4) C4324" -ms.date: "11/04/2016" +description: "Learn more about: Compiler Warning (level 4) C4324" +ms.date: 07/22/2025 f1_keywords: ["C4324"] helpviewer_keywords: ["C4324"] ---