[Buildroot] [PATCH] package/libcap: fix static builds

[Buildroot] [PATCH] package/libcap: fix static builds

[Thomas Petazzoni via buildroot]

Since libcap has been updated to version 2.77 in Buildroot commit
42f2b480a5a81c7443f177bf541632b0fe501720, the build fails for
statically-linked configurations when the host system doesn't have a
static version of libc installed:

/usr/bin/ld: cannot find -lc: No such file or directory
/usr/bin/ld: have you installed the static version of the c library ?

This is because the -static flag that is supposed to be used when
building target code also gets passed to the host compiler... which is
obviously incorrect and leads to the build failure.

This issue was introduced by upstream commit
c3ddf45d9afaab85d3b7db0dc7bfd1aafb8fde50, which was reverted right
after the 2.77 release in commit
542d7d86ecd2129dd5fe7e5b31ba307304f5b319, which we are simply
backporting here.

Fixes:

  https://autobuild.buildroot.net/results/f6d/f6dc61a9d57e282691b87a3a8fadcb5d5ea8fd8b/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
This is IMO an improved version of Bernd's proposal at
https://lore.kernel.org/buildroot/20251109080011.481333-1-bernd@kuhls.net/
for two reasons:
- A clearer/more correct explanation (the issue is not Fedora related)
- Backport an upstream commit
---
 ...Add-build-ldflags-to-_makenames-rule.patch | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 package/libcap/0001-Revert-libcap-Add-build-ldflags-to-_makenames-rule.patch

diff --git a/package/libcap/0001-Revert-libcap-Add-build-ldflags-to-_makenames-rule.patch b/package/libcap/0001-Revert-libcap-Add-build-ldflags-to-_makenames-rule.patch
new file mode 100644
index 0000000000..ae9655fd57
--- /dev/null
+++ b/package/libcap/0001-Revert-libcap-Add-build-ldflags-to-_makenames-rule.patch
@@ -0,0 +1,34 @@
+From 542d7d86ecd2129dd5fe7e5b31ba307304f5b319 Mon Sep 17 00:00:00 2001
+From: "Andrew G. Morgan" <morgan@kernel.org>
+Date: Mon, 10 Nov 2025 18:26:34 -0800
+Subject: [PATCH] Revert "libcap: Add build ldflags to _makenames rule"
+
+This reverts commit c3ddf45d9afaab85d3b7db0dc7bfd1aafb8fde50.
+
+The details of what this broke are here:
+
+  https://bugzilla.kernel.org/show_bug.cgi?id=220691#c2
+
+Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
+Upstream: 542d7d86ecd2129dd5fe7e5b31ba307304f5b319
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ libcap/Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libcap/Makefile b/libcap/Makefile
+index f0eb87e..e90a950 100644
+--- a/libcap/Makefile
++++ b/libcap/Makefile
+@@ -80,7 +80,7 @@ $(PSXTITLE).pc: $(PSXTITLE).pc.in
+ 		$< >$@
+ 
+ _makenames: _makenames.c cap_names.list.h
+-	$(BUILD_CC) $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $< -o $@ $(BUILD_LDFLAGS)
++	$(BUILD_CC) $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $< -o $@
+ 
+ cap_names.h: _makenames
+ 	./_makenames > cap_names.h
+-- 
+2.51.1
+
-- 
2.51.1

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Re: [Buildroot] [PATCH] package/libcap: fix static builds

[Peter Korsgaard]

>>>>> "Thomas" == Thomas Petazzoni via buildroot <buildroot@buildroot.org> writes:

 > Since libcap has been updated to version 2.77 in Buildroot commit
 > 42f2b480a5a81c7443f177bf541632b0fe501720, the build fails for
 > statically-linked configurations when the host system doesn't have a
 > static version of libc installed:

 > /usr/bin/ld: cannot find -lc: No such file or directory
 > /usr/bin/ld: have you installed the static version of the c library ?

 > This is because the -static flag that is supposed to be used when
 > building target code also gets passed to the host compiler... which is
 > obviously incorrect and leads to the build failure.

 > This issue was introduced by upstream commit
 > c3ddf45d9afaab85d3b7db0dc7bfd1aafb8fde50, which was reverted right
 > after the 2.77 release in commit
 > 542d7d86ecd2129dd5fe7e5b31ba307304f5b319, which we are simply
 > backporting here.

 > Fixes:

 >   https://autobuild.buildroot.net/results/f6d/f6dc61a9d57e282691b87a3a8fadcb5d5ea8fd8b/

 > Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
 > ---
 > This is IMO an improved version of Bernd's proposal at
 > https://lore.kernel.org/buildroot/20251109080011.481333-1-bernd@kuhls.net/
 > for two reasons:
 > - A clearer/more correct explanation (the issue is not Fedora related)
 > - Backport an upstream commit

Committed, thanks.

-- 
Bye, Peter Korsgaard
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