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c3f3705a2f
The meson build configuration of libgpiod2 unconditionally requires a C++ compiler, although it is only useful if building the C++ bindings. This is causing autobuild failures with an obscure error message: "ERROR: Unable to get gcc pre-processor defines". Fix the failures by only requiring a C++ compiler when we want the C++ bindings. Fixes: - https://autobuild.buildroot.org/results/d1c19ffa0c599bd2ba9be965a98fc8f778d6e366 - https://autobuild.buildroot.org/results/c6b3c9311d628bdb4ea103431767493fab9a3668 - https://autobuild.buildroot.org/results/8e799050c5779c680ff5e5136571f57d29239f2f - https://autobuild.buildroot.org/results/d6d8833acfe00559579defbbf3ca34c0edbe7869 Signed-off-by: Edgar Bonet <bonet@grenoble.cnrs.fr> Signed-off-by: Julien Olivain <ju.o@free.fr>
47 lines
1.6 KiB
Diff
47 lines
1.6 KiB
Diff
From fce6b611e2530602c44fd914222529028173c509 Mon Sep 17 00:00:00 2001
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From: Edgar Bonet <bonet@grenoble.cnrs.fr>
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Date: Wed, 19 Aug 2026 18:15:25 +0200
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Subject: [PATCH] build: do not require a C++ compiler if it is not needed
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Languages specified in the meson project() function are considered hard
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dependencies. When trying to build libgpiod in an environment lacking a
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C++ compiler, the build fails with an obscure error message ("ERROR:
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Unable to get gcc pre-processor defines").
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As the C++ compiler is only needed for building the C++ bindings, do not
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require it unless the option bindings-cxx is enabled.
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Signed-off-by: Edgar Bonet <bonet@grenoble.cnrs.fr>
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Upstream: https://lore.kernel.org/linux-gpio/0eb5c26d-731c-4ebb-be34-76466cf57720@grenoble.cnrs.fr/
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---
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meson.build | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/meson.build b/meson.build
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index c030b50..fed612f 100644
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--- a/meson.build
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+++ b/meson.build
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@@ -1,7 +1,7 @@
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# SPDX-License-Identifier: GPL-2.0-or-later
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# SPDX-FileCopyrightText: 2026 Qualcomm Technologies, Inc. and/or its subsidiaries
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-project('libgpiod', ['c', 'cpp'],
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+project('libgpiod', 'c',
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version: '2.3.1',
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license: 'LGPL-2.1-or-later',
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default_options: [
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@@ -56,6 +56,10 @@ opt_dbus = get_option('dbus')
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opt_introspection = get_option('introspection')
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opt_systemd = get_option('systemd')
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+if opt_bindings_cxx.allowed()
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+ add_languages('cpp')
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+endif
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+
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if get_option('profiling')
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profiling_c_args = ['-fprofile-arcs', '-ftest-coverage']
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profiling_link_args = ['-lgcov']
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--
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2.43.0
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