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Date:   Sat, 27 Aug 2022 14:38:36 -0500
From:   Robert Elliott <>
Cc:,,,,, Robert Elliott <>
Subject: [PATCH] docs/core-api: expand Fedora instructions for GCC plugins

In Fedora 36, cross-compiling an allmodconfig configuration
for other architectures on x86 fails with this problem:

In file included from ../scripts/gcc-plugins/gcc-common.h:95,
                 from ../scripts/gcc-plugins/latent_entropy_plugin.c:78:
/usr/lib/gcc/aarch64-linux-gnu/12/plugin/include/builtins.h:23:10: fatal
error: mpc.h: No such file or directory
   23 | #include <mpc.h>
      |          ^~~~~~~
compilation terminated.

In that distro, that header file is available in the separate
libmpc-devel package.

Although future versions of Fedora might correctly mark
that dependency, mention this additional package.

To help detect such problems ahead of time, describe the
    gcc -print-file-name=plugin
command that is used by scripts/gcc-plugins/Kconfig to detect
plugins [1].


Fixes: 43e96ef8b70c50f ("docs/core-api: Add Fedora instructions for GCC plugins");
Signed-off-by: Robert Elliott <>
 Documentation/kbuild/gcc-plugins.rst | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/Documentation/kbuild/gcc-plugins.rst b/Documentation/kbuild/gcc-plugins.rst
index 0ba76719f1b9..c578c6ba3eb6 100644
--- a/Documentation/kbuild/gcc-plugins.rst
+++ b/Documentation/kbuild/gcc-plugins.rst
@@ -90,7 +90,11 @@ e.g., on Ubuntu for gcc-10::
 Or on Fedora::
-	dnf install gcc-plugin-devel
+	dnf install gcc-plugin-devel libmpc-devel
+Or on Fedora when using cross-compilers that include plugins::
+	dnf install libmpc-devel
 Enable the GCC plugin infrastructure and some plugin(s) you want to use
 in the kernel config::
@@ -99,6 +103,19 @@ in the kernel config::
+Run gcc (native or cross-compiler) to ensure plugin headers are detected::
+	gcc -print-file-name=plugin
+	CROSS_COMPILE=arm-linux-gnu- ${CROSS_COMPILE}gcc -print-file-name=plugin
+The word "plugin" means they are not detected::
+	plugin
+A full path means they are detected::
+       /usr/lib/gcc/x86_64-redhat-linux/12/plugin
 To compile the minimum tool set including the plugin(s)::
 	make scripts

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