| Message ID | 20240729143116.1804615-4-mark.rutland@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Allow use of bare-metal toolchains | expand |
diff --git a/configure.ac b/configure.ac index ce41dae..1f2f4f6 100644 --- a/configure.ac +++ b/configure.ac @@ -128,6 +128,9 @@ AC_ARG_ENABLE([gicv3], AM_CONDITIONAL([GICV3], [test "x$USE_GICV3" = "xyes"]) AS_IF([test "x$USE_GICV3" = "xyes"], [], [USE_GICV3=no]) +# Ensure AC_PROG_CC tries to build a bare-metal object +CFLAGS="${CFLAGS} -ffreestanding -nostdlib" + # Ensure that we have all the needed programs AC_PROG_CC AC_PROG_CPP
Currently it is not possible to build the boot-wrapper with a bare-metal toolchain, as the configure script tries to build a hosted object. For example, trying to build with the bare-metal aarch64-linux GCC 13.2.0 toolchain from kernel.org fails with: | [mark@lakrids:~/src/boot-wrapper-aarch64]% usekorg 13.2.0 ./configure --enable-gicv3 --host=aarch64-linux --with-kernel-dir=../linux --with-cmdline="console=ttyAMA0 earlycon=pl011,0x1c090000 root=/dev/vda kvm_arm.mode=vhe" | checking for a BSD-compatible install... /usr/bin/install -c | checking whether build environment is sane... yes | checking for aarch64-linux-strip... aarch64-linux-strip | checking for a thread-safe mkdir -p... /usr/bin/mkdir -p | checking for gawk... gawk | checking whether make sets $(MAKE)... yes | checking whether make supports nested variables... yes | checking whether DTB file exists... yes | checking whether kernel image exists... yes | checking for aarch64-linux-gcc... aarch64-linux-gcc | checking whether the C compiler works... no | configure: error: in `/home/mark/src/boot-wrapper-aarch64': | configure: error: C compiler cannot create executables | See `config.log' for more details This behaviour was an unintentional side-effect of moving to autotools in commit: bae4ae6a834cd15b ("Add autotools configuration.") ... as the default CFLAGS end up trying to build a hosted object. Pass the necessary CFLAGS to build a bare-metal object. matching what we do in Makefile.am, so that the configure script doesn't reject bare-metal toolchains. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Andre Przywara <andre.przywara@arm.com> Cc: Akos Denke <akos.denke@arm.com> Cc: Luca Fancellu <luca.fancellu@arm.com> Cc: Marc Zyngier <maz@kernel.org> --- configure.ac | 3 +++ 1 file changed, 3 insertions(+)