From the build configuration, Buildroot defines and set some compiler
and linker flags that should be passed to any packages build-system.
For package using the cmake-package infrastructure, this is achieved
via the toolchainfile.cmake.
This change simplifies the way the toolchainfile.cmake file handles
these flags: it now just sets them, without any attempt to extend them
with those Buildroot defined.
This change still allows overriding these flags from the configure
command line.
So, now, when a CMake-based package needs to extend them, they should
be fully set from the package *.mk file. This behavior is consistent
with what is done for others package infrastructures.
This change should not pull any regression WRT the bug #7280 [1].
However, now, when someone uses the toolchainfile.cmake file outside of
Buildroot, he/she must overload all compiler/linker flags (including the
ones Buildroot sets since they no longer get automatically added).
[1] https://bugs.busybox.net/show_bug.cgi?id=7280
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
When a build type is set, CMake does append some flags that can override
those set by Buildroot due to the gcc option parser (in which the last
argument controling an option wins).
Hereafter is a summary of the optimization and debug flags set by
Buildroot and appended by CMake.
* Flags set by Buildroot depending on the configuration:
BR2_ENABLE_DEBUG | Optim. level | Buildroot {C,CXX}FLAGS
=================+=====================+=======================
y | BR2_OPTIMIZE_S | -Os -gx
y | BR2_OPTIMIZE_G | -Og -gx
y | BR2_OPTIMIZE_{0..3} | -On -gx
n | BR2_OPTIMIZE_S | -Os
n | BR2_OPTIMIZE_G | -Og
n | BR2_OPTIMIZE_{0..3} | -On
* Default flags appended by CMake depending on the build type:
Build type | Flags | Effects on {C,CXX}FLAGS
===============+=================+===========================================
Debug | -g | Force -g, compatible with BR2_ENABLE_DEBUG
MinSizeRel | -Os -DNDEBUG | Set -Os, compatible with BR2_OPTIMIZE_S
Release | -O3 -DNDEBUG | Set -O3, closest to the others cases,
| | though the optimization level is forced.
RelWithDebInfo | -O2 -g -DNDEBUG | Force -g and set -O2, not friendly with BR
To avoid the CMake flags take precedence over the Buildroot ones, this
change sets in toolchainfile.cmake the per-config compiler flags CMake
can append depending on the build type Buildroot defined.
So, CMake does not mess up with the compilation flags Buildroot sets.
It is still possible to override these per-config flags on the cmake
command line.
Note:
If a CMake-based project forces the compiler and/or linker flag
definitions (the default ones or the per-config ones - e.g.
CMAKE_C_FLAGS/CMAKE_C_FLAGS_{DEBUG,RELEASE}), there is not much
Buildroot can do about it.
So, the flags will be overwritten anyway in these cases.
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
[Thomas:
- adjust comment in toolchainfile.cmake.in, as suggested by Arnout.
- also handle CMAKE_Fortran_FLAGS_*, as suggested by Arnout.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
The chosen CMAKE_BUILD_TYPE encodes an option of the Buildroot
configuration, so it makes more sense to save it in the
toolchainfile.cmake than to pass it during configure.
It is still possible to override the build type on the cmake
command line.
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
[Thomas: reword description in the CHANGES file.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This change enforces the CMAKE_SYSROOT value set in the toolchainfile.cmake.
This fix overrides the CMake heuristics used to guess it, and turns off some
non-desirable behavior adding "-isystem ..." flags to the compiler command
line, misleading the compiler and making the build failed due to some
unfound standard headers.
Fixes:
http://autobuild.buildroot.net/results/f7e/f7e92678e91a6cb15ccf32d4a7d75b39f49d6000/defconfig
(and others)
Cc: Ben Boeckel <mathstuf@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Since the fortran support is conditional, only enable it when needed.
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Cc: Benjamin Kamath <bkamath@spaceflight.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
All the complexity with the different ways that CMAKE_C_COMPILER and
CMAKE_C_COMPILER_ARG1 can be set are no longer needed, it's all handled
by the toolchain wrapper now.
Note that it is still necessary to handle this for the host build.
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This change prevents CMake from searching outside the sysroot location
for CMake modules when cross-compiling.
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This is rarely needed by packages, but convenient to have when it is.
[Thomas:
- don't define ARM_VARIANT as this name is too global, use
CMAKE_SYSTEM_PROCESSOR_ARM_VARIANT instead.
- don't use ifndef, but a more traditional else clause, for the
non-ARM cases.]
Signed-off-by: Volker Krause <volker.krause@kdab.com>
Reviewed-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Reviewed-by: Romain Naour <romain.naour@openwide.fr>
Acked-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Fix#7280 [1]
When the FORCE option is passed to the set command, the variable is
added/updated in the CMake cache every single time CMake processes this
command.
Because the toolchainfile.cmake prepends architecture/toolchain flags
to the CMAKE_{C,CXX}_FLAGS, this makes the CFLAGS being updated in the
generated Makefiles each time one reconfigures its project. So it
forces the compilation of everything, even when nothing has changed.
[1] https://bugs.busybox.net/show_bug.cgi?id=7280
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Tested-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
(tested the SimpleApp reproduction scenario described in the bug report)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
The linker flags are part of the toolchain configuration, so set them for
the CMake-based packages.
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This patch updates the generated toolchainfile.cmake to use ccache.
When toolchainfile.cmake is used inside Buildroot, using ccache during
the build is driven by a CMake knob: USE_CCACHE, automatically set by
the cmake-package infrastructure and reflecting the BR2_CCACHE value.
Since this toolchainefile.cmake file can be used outside Buildroot, and
this file also set a couple of things (among these: the sysroot cflag,
some pkg-config environment variables), it is important to set the
compiler variables as well to keep the consistency of the
cross-compilation configuration.
So, when it is used outside Buildroot, using ccache for the build is
driven by the ccache program availability.
Note that using ccache for the build is achieved by setting the *_ARG1
CMake variables to let CMake use ccache without failing in detecting
the compiler.
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Cc: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
The patch allows sharing or moving the toolchains.
This is a step toward making the toolchain/sdk relocatable.
Closes#6818
[Peter: reword comment as suggested by Thomas]
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Cc: Uwe Strempel <u.strempel@googlemail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This patch introduces a toolchainfile.cmake.in template which is filled
by Buildroot.
Using a toolchainfile.cmake.in template file allows to avoid overloading
quoting and/or escaping and it becomes much more similar to the
resulting file.
This patch also cleans up the quoting style.
[Peter: drop stdin redirect as suggested by Thomas]
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
