From 80202e3ec8b380e05b8666f37bbc43bde108cf8c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Petryka?=
 <35800402+MichalPetryka@users.noreply.github.com>
Date: Tue, 23 Jun 2026 20:15:07 +0200
Subject: [PATCH 1/5] Try enabling ICF on Linux

Opening to see CI results and size diffs
---
 eng/native/configurecompiler.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/eng/native/configurecompiler.cmake b/eng/native/configurecompiler.cmake
index ee9d2b574c543d..58f770a40fa358 100644
--- a/eng/native/configurecompiler.cmake
+++ b/eng/native/configurecompiler.cmake
@@ -759,6 +759,7 @@ if (CLR_CMAKE_HOST_UNIX OR CLR_CMAKE_HOST_WASI)
     add_linker_flag(-Wl,-dead_strip CHECKED RELEASE RELWITHDEBINFO)
   elseif(NOT LD_SOLARIS)
     add_linker_flag(-Wl,--gc-sections CHECKED RELEASE RELWITHDEBINFO)
+    add_linker_flag(-Wl,--icf=all RELEASE RELWITHDEBINFO)
   endif()
 
   # Specify the minimum supported version of macOS

From d6cf672dbc1f5373e3485bf4a70ead7a1ff4e7cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Petryka?=
 <35800402+MichalPetryka@users.noreply.github.com>
Date: Wed, 24 Jun 2026 10:16:48 +0200
Subject: [PATCH 2/5] Update eng/native/configurecompiler.cmake

Co-authored-by: Adeel Mujahid <3840695+am11@users.noreply.github.com>
---
 eng/native/configurecompiler.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/eng/native/configurecompiler.cmake b/eng/native/configurecompiler.cmake
index 58f770a40fa358..fdbb619f127f4a 100644
--- a/eng/native/configurecompiler.cmake
+++ b/eng/native/configurecompiler.cmake
@@ -759,7 +759,9 @@ if (CLR_CMAKE_HOST_UNIX OR CLR_CMAKE_HOST_WASI)
     add_linker_flag(-Wl,-dead_strip CHECKED RELEASE RELWITHDEBINFO)
   elseif(NOT LD_SOLARIS)
     add_linker_flag(-Wl,--gc-sections CHECKED RELEASE RELWITHDEBINFO)
-    add_linker_flag(-Wl,--icf=all RELEASE RELWITHDEBINFO)
+    if (NOT LD_GNU)
+      add_linker_flag(-Wl,--icf=all RELEASE RELWITHDEBINFO)
+    endif()
   endif()
 
   # Specify the minimum supported version of macOS

From 46f3dcb2410f588ffd65465c6c0c387dcaf96d04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Petryka?=
 <35800402+MichalPetryka@users.noreply.github.com>
Date: Wed, 24 Jun 2026 10:24:06 +0200
Subject: [PATCH 3/5] Also enable for NativeAOT

---
 .../BuildIntegration/Microsoft.NETCore.Native.Unix.targets   | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets b/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets
index 1e4afaab8cc578..c30f077a8afabf 100644
--- a/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets
+++ b/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets
@@ -289,8 +289,9 @@ The .NET Foundation licenses this file to you under the MIT license.
       <!-- OpenBSD's GSSAPI is provided by the Heimdal package. -->
       <LinkerArg Include="-L&quot;$(SysRoot)/usr/local/heimdal/lib&quot; -l:libgssapi.so.9.0" Condition="'$(_targetOS)' == 'openbsd'" />
       <LinkerArg Include="@(ExtraLinkerArg->'-Wl,%(Identity)')" />
-      <LinkerArg Include="@(NativeFramework->'-framework %(Identity)')" Condition="'$(_IsApplePlatform)' == 'true'" />
-      <LinkerArg Include="-Wl,--eh-frame-hdr" Condition="'$(_IsApplePlatform)' != 'true'" />
+      <LinkerArg Include="@(NativeFramework->'-framework %(Identity)')" Condition="'$(_IsApplePlatform)' == 'true'
+      <LinkerArg Include="-Wl,--eh-frame-hdr" Condition="'$(_IsApplePlatform)' != 'true'" />" />
+      <LinkerArg Include="-Wl,--icf=all" Condition="'$(_IsApplePlatform)' != 'true' and '$(LinkerFlavor)' != 'bfd'" />
 
       <!-- Google requires all the native libraries to be aligned to 16 bytes (for 16k memory page size)
            This is required only for 64-bit binaries.

From da0d9688aa0aa230d102a85ba6f15cdf42783bb5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Petryka?=
 <35800402+MichalPetryka@users.noreply.github.com>
Date: Wed, 24 Jun 2026 10:25:43 +0200
Subject: [PATCH 4/5] Fix accidental file corruption

---
 .../BuildIntegration/Microsoft.NETCore.Native.Unix.targets    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets b/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets
index c30f077a8afabf..df253ebcae8201 100644
--- a/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets
+++ b/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets
@@ -289,8 +289,8 @@ The .NET Foundation licenses this file to you under the MIT license.
       <!-- OpenBSD's GSSAPI is provided by the Heimdal package. -->
       <LinkerArg Include="-L&quot;$(SysRoot)/usr/local/heimdal/lib&quot; -l:libgssapi.so.9.0" Condition="'$(_targetOS)' == 'openbsd'" />
       <LinkerArg Include="@(ExtraLinkerArg->'-Wl,%(Identity)')" />
-      <LinkerArg Include="@(NativeFramework->'-framework %(Identity)')" Condition="'$(_IsApplePlatform)' == 'true'
-      <LinkerArg Include="-Wl,--eh-frame-hdr" Condition="'$(_IsApplePlatform)' != 'true'" />" />
+      <LinkerArg Include="@(NativeFramework->'-framework %(Identity)')" Condition="'$(_IsApplePlatform)' == 'true'" />
+      <LinkerArg Include="-Wl,--eh-frame-hdr" Condition="'$(_IsApplePlatform)' != 'true'" />
       <LinkerArg Include="-Wl,--icf=all" Condition="'$(_IsApplePlatform)' != 'true' and '$(LinkerFlavor)' != 'bfd'" />
 
       <!-- Google requires all the native libraries to be aligned to 16 bytes (for 16k memory page size)

From c33eafe6faeaae715dc0cabe9c1a35d00ab4ba17 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Petryka?=
 <35800402+MichalPetryka@users.noreply.github.com>
Date: Wed, 24 Jun 2026 11:17:37 +0200
Subject: [PATCH 5/5] Update eng/native/configurecompiler.cmake

Co-authored-by: Adeel Mujahid <3840695+am11@users.noreply.github.com>
---
 eng/native/configurecompiler.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eng/native/configurecompiler.cmake b/eng/native/configurecompiler.cmake
index fdbb619f127f4a..75208e6cff149f 100644
--- a/eng/native/configurecompiler.cmake
+++ b/eng/native/configurecompiler.cmake
@@ -759,7 +759,7 @@ if (CLR_CMAKE_HOST_UNIX OR CLR_CMAKE_HOST_WASI)
     add_linker_flag(-Wl,-dead_strip CHECKED RELEASE RELWITHDEBINFO)
   elseif(NOT LD_SOLARIS)
     add_linker_flag(-Wl,--gc-sections CHECKED RELEASE RELWITHDEBINFO)
-    if (NOT LD_GNU)
+    if (NOT LD_GNU AND NOT CLR_CMAKE_TARGET_ARCH_WASM)
       add_linker_flag(-Wl,--icf=all RELEASE RELWITHDEBINFO)
     endif()
   endif()