[PATCH] libgcc: fix build for baremetal

[PATCH] libgcc: fix build for baremetal

[Joerg Vehlow]

By removing the erroneous EXTRA_OECONF override in 020d5f0, gcc-cross is now configured with correct sysroot flags, which removes the hosts include directory from the internal paths.
This in turn leads to libgcc not finding libc headers (as it should) and breaks libgcc build.
In order to fix this, libgcc must be built almost like libgcc-initial.

Signed-off-by: Joerg Vehlow <joerg.vehlow@emlix.com>
---
 meta/recipes-devtools/gcc/libgcc.inc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/meta/recipes-devtools/gcc/libgcc.inc b/meta/recipes-devtools/gcc/libgcc.inc
index e92dadf021..93e217f567 100644
--- a/meta/recipes-devtools/gcc/libgcc.inc
+++ b/meta/recipes-devtools/gcc/libgcc.inc
@@ -37,6 +37,16 @@ LICENSE:${PN}-dev = "GPL-3.0-or-later WITH GCC-exception-3.1"
 LICENSE:${PN}-dbg = "GPL-3.0-or-later WITH GCC-exception-3.1"
 LICENSE:${PN}-src = "GPL-3.0-or-later WITH GCC-exception-3.1"
 
+# On baremetal there is no libc:
+# configure need limits.h for its sanity check
+# libc dependencies have to be patched out just like in libgcc-initial
+do_configure:prepend:libc-baremetal () {
+	install -d ${STAGING_INCDIR}
+	touch ${STAGING_INCDIR}/limits.h
+	sed -i -e 's#INHIBIT_LIBC_CFLAGS =.*#INHIBIT_LIBC_CFLAGS = -Dinhibit_libc#' ${B}/gcc/libgcc.mvars
+	sed -i -e 's#inhibit_libc = false#inhibit_libc = true#' ${B}/gcc/Makefile
+}
+
 FILES:${PN}-dev = "\
     ${base_libdir}/libgcc*.so \
     ${@oe.utils.conditional('BASETARGET_SYS', '${TARGET_SYS}', '', '${libdir}/${BASETARGET_SYS}', d)} \

Re: [OE-core] [PATCH] libgcc: fix build for baremetal

[Ryan Eatmon]

On 10/7/2026 12:57 AM, Joerg Vehlow via lists.openembedded.org wrote:
> By removing the erroneous EXTRA_OECONF override in 020d5f0, gcc-cross is now configured with correct sysroot flags, which removes the hosts include directory from the internal paths.
> This in turn leads to libgcc not finding libc headers (as it should) and breaks libgcc build.
> In order to fix this, libgcc must be built almost like libgcc-initial.
> 
> Signed-off-by: Joerg Vehlow <joerg.vehlow@emlix.com>
> ---
>   meta/recipes-devtools/gcc/libgcc.inc | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/meta/recipes-devtools/gcc/libgcc.inc b/meta/recipes-devtools/gcc/libgcc.inc
> index e92dadf021..93e217f567 100644
> --- a/meta/recipes-devtools/gcc/libgcc.inc
> +++ b/meta/recipes-devtools/gcc/libgcc.inc
> @@ -37,6 +37,16 @@ LICENSE:${PN}-dev = "GPL-3.0-or-later WITH GCC-exception-3.1"
>   LICENSE:${PN}-dbg = "GPL-3.0-or-later WITH GCC-exception-3.1"
>   LICENSE:${PN}-src = "GPL-3.0-or-later WITH GCC-exception-3.1"
>   
> +# On baremetal there is no libc:
> +# configure need limits.h for its sanity check
> +# libc dependencies have to be patched out just like in libgcc-initial
> +do_configure:prepend:libc-baremetal () {
> +	install -d ${STAGING_INCDIR}
> +	touch ${STAGING_INCDIR}/limits.h
> +	sed -i -e 's#INHIBIT_LIBC_CFLAGS =.*#INHIBIT_LIBC_CFLAGS = -Dinhibit_libc#' ${B}/gcc/libgcc.mvars
> +	sed -i -e 's#inhibit_libc = false#inhibit_libc = true#' ${B}/gcc/Makefile
> +}
> +
>   FILES:${PN}-dev = "\
>       ${base_libdir}/libgcc*.so \
>       ${@oe.utils.conditional('BASETARGET_SYS', '${TARGET_SYS}', '', '${libdir}/${BASETARGET_SYS}', d)} \


This does fix our build issue.  So it should be safe to pick up this 
patch and not revert the original change.


-- 
Ryan Eatmon                reatmon@ti.com
-----------------------------------------
Texas Instruments, Inc.  -  LCPD  -  MGTS

Re: [OE-core] [PATCH] libgcc: fix build for baremetal

[Denys Dmytriyenko]

On Wed, Oct 07, 2026 at 03:33:56PM -0500, Ryan Eatmon wrote:
> 
> 
> On 10/7/2026 12:57 AM, Joerg Vehlow via lists.openembedded.org wrote:
> >By removing the erroneous EXTRA_OECONF override in 020d5f0, gcc-cross is now configured with correct sysroot flags, which removes the hosts include directory from the internal paths.
> >This in turn leads to libgcc not finding libc headers (as it should) and breaks libgcc build.
> >In order to fix this, libgcc must be built almost like libgcc-initial.
> >
> >Signed-off-by: Joerg Vehlow <joerg.vehlow@emlix.com>
> >---
> >  meta/recipes-devtools/gcc/libgcc.inc | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> >diff --git a/meta/recipes-devtools/gcc/libgcc.inc b/meta/recipes-devtools/gcc/libgcc.inc
> >index e92dadf021..93e217f567 100644
> >--- a/meta/recipes-devtools/gcc/libgcc.inc
> >+++ b/meta/recipes-devtools/gcc/libgcc.inc
> >@@ -37,6 +37,16 @@ LICENSE:${PN}-dev = "GPL-3.0-or-later WITH GCC-exception-3.1"
> >  LICENSE:${PN}-dbg = "GPL-3.0-or-later WITH GCC-exception-3.1"
> >  LICENSE:${PN}-src = "GPL-3.0-or-later WITH GCC-exception-3.1"
> >+# On baremetal there is no libc:
> >+# configure need limits.h for its sanity check
> >+# libc dependencies have to be patched out just like in libgcc-initial
> >+do_configure:prepend:libc-baremetal () {
> >+	install -d ${STAGING_INCDIR}
> >+	touch ${STAGING_INCDIR}/limits.h
> >+	sed -i -e 's#INHIBIT_LIBC_CFLAGS =.*#INHIBIT_LIBC_CFLAGS = -Dinhibit_libc#' ${B}/gcc/libgcc.mvars
> >+	sed -i -e 's#inhibit_libc = false#inhibit_libc = true#' ${B}/gcc/Makefile
> >+}
> >+
> >  FILES:${PN}-dev = "\
> >      ${base_libdir}/libgcc*.so \
> >      ${@oe.utils.conditional('BASETARGET_SYS', '${TARGET_SYS}', '', '${libdir}/${BASETARGET_SYS}', d)} \
> 
> 
> This does fix our build issue.  So it should be safe to pick up this
> patch and not revert the original change.

Yes, I can confirm this change fixes all my other test builds for this issue.

-- 
Denys