[Buildroot] [PATCH] package/gcc: fix powerpc toolchain issues

[Buildroot] [PATCH] package/gcc: fix powerpc toolchain issues

[Waldemar Brodkorb]

Some of the powerpc CPU's supported by Buildroot are dual mode CPU's,
which means 32 Bit and 64 Bit mode is supported.

See here the gcc documentation for details about --with-cpu-32:
https://gcc.gnu.org/install/configure.html

See here for a discussion on the musl mailinglist about the error:
https://inbox.vuxu.org/musl/20220722162900.GB1320090@port70.net/

Fixes:
 - http://autobuild.buildroot.net/results/450/4509d8cfb7d99beb4ef023f170490def1d90f92c
 - http://autobuild.buildroot.net/results/654/6545a464d49f9f3c6740a5208cfad7f09ec4cb8b
 - http://autobuild.buildroot.net/results/cf8/cf866d5320b069eb1e8b4f05e8e58de0ad2ec7b5

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
---

Thanks to Thomas Petazzoni for pointing me to the gcc docs and the
--with-cpu-32 option via IRC. 

---
 package/gcc/gcc.mk | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/package/gcc/gcc.mk b/package/gcc/gcc.mk
index 1ecbf7e9b4..3050229176 100644
--- a/package/gcc/gcc.mk
+++ b/package/gcc/gcc.mk
@@ -225,9 +225,17 @@ endif
 ifneq ($(GCC_TARGET_FP32_MODE),)
 HOST_GCC_COMMON_CONF_OPTS += --with-fp-32="$(GCC_TARGET_FP32_MODE)"
 endif
+
+# musl/uClibc-ng does not work with biarch powerpc toolchains, we
+# need to configure gcc explicitely for 32 Bit for CPU's supporting
+# 64 Bit and 32 Bit
 ifneq ($(GCC_TARGET_CPU),)
+ifeq ($(BR2_powerpc),y)
+HOST_GCC_COMMON_CONF_OPTS += --with-cpu-32=$(GCC_TARGET_CPU)
+else
 HOST_GCC_COMMON_CONF_OPTS += --with-cpu=$(GCC_TARGET_CPU)
 endif
+endif
 
 ifneq ($(GCC_TARGET_FPU),)
 HOST_GCC_COMMON_CONF_OPTS += --with-fpu=$(GCC_TARGET_FPU)
-- 
2.39.2

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Re: [Buildroot] [PATCH] package/gcc: fix powerpc toolchain issues

[Thomas Petazzoni via buildroot]

On Thu, 10 Aug 2023 06:32:52 +0200
Waldemar Brodkorb <wbx@openadk.org> wrote:

> Some of the powerpc CPU's supported by Buildroot are dual mode CPU's,
> which means 32 Bit and 64 Bit mode is supported.
> 
> See here the gcc documentation for details about --with-cpu-32:
> https://gcc.gnu.org/install/configure.html
> 
> See here for a discussion on the musl mailinglist about the error:
> https://inbox.vuxu.org/musl/20220722162900.GB1320090@port70.net/
> 
> Fixes:
>  - http://autobuild.buildroot.net/results/450/4509d8cfb7d99beb4ef023f170490def1d90f92c
>  - http://autobuild.buildroot.net/results/654/6545a464d49f9f3c6740a5208cfad7f09ec4cb8b
>  - http://autobuild.buildroot.net/results/cf8/cf866d5320b069eb1e8b4f05e8e58de0ad2ec7b5
> 
> Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
> ---

Applied to master with an improved commit log. Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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