diff mbox series

libgpiod: Fix build failure with musl

Message ID 4a8c598db0a78421b074f19eb2157d89f3198440.1639047500.git.viresh.kumar@linaro.org
State New
Headers show
Series libgpiod: Fix build failure with musl | expand

Commit Message

Viresh Kumar Dec. 9, 2021, 10:58 a.m. UTC 
Musl defines the _IO*() macros in the files included via <sys/ioctl.h>
and hence we get redefinition errors during build as <linux/ioctl.h>,
included via <uapi/gpio.h>, defines them again.

Fix this by undefining the macros between both the includes, document it
all in musl-compat.h as well.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 lib/internal.h    |  1 +
 lib/musl-compat.h | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 lib/musl-compat.h
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Patch

diff --git a/lib/internal.h b/lib/internal.h
index 32f36b5cd4cf..89c94cdd8ef6 100644
--- a/lib/internal.h
+++ b/lib/internal.h
@@ -8,6 +8,7 @@ 
 #include <stddef.h>
 #include <stdint.h>
 
+#include "musl-compat.h"
 #include "uapi/gpio.h"
 
 /* For internal library use only. */
diff --git a/lib/musl-compat.h b/lib/musl-compat.h
new file mode 100644
index 000000000000..69787de86f7c
--- /dev/null
+++ b/lib/musl-compat.h
@@ -0,0 +1,18 @@ 
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/* SPDX-FileCopyrightText: 2021 Bartosz Golaszewski <bgolaszewski@baylibre.com> */
+
+#ifndef __LIBGPIOD_MUSL_COMPAT_H__
+#define __LIBGPIOD_MUSL_COMPAT_H__
+
+/*
+ * Musl's <sys/ioctl.h> (<bits/ioctl.h>) also defines below macros, un-define
+ * them before adding the ones via <linux/gpio.h> to avoid build failures.
+ */
+
+#undef _IOWR
+#undef _IOR
+#undef _IOW
+#undef _IOC
+#undef _IO
+
+#endif /* __LIBGPIOD_MUSL_COMPAT_H__ */