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authorViktor Malik <vmalik@redhat.com>2023-10-25 09:19:12 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2023-10-26 16:32:12 +0300
commit870f09f1ba3014e2c157b14299c172b4bb716638 (patch)
treeeccba13e343802ae0bef8d186d918062e1634396 /samples
parentc421c12586b3f00fb96b5c9af15c9a051a9090b1 (diff)
downloadlinux-870f09f1ba3014e2c157b14299c172b4bb716638.tar.xz
samples/bpf: Allow building with custom CFLAGS/LDFLAGS
Currently, it is not possible to specify custom flags when building samples/bpf. The flags are defined in TPROGS_CFLAGS/TPROGS_LDFLAGS variables, however, when trying to override those from the make command, compilation fails. For example, when trying to build with PIE: $ make -C samples/bpf TPROGS_CFLAGS="-fpie" TPROGS_LDFLAGS="-pie" This is because samples/bpf/Makefile updates these variables, especially appends include paths to TPROGS_CFLAGS and these updates are overridden by setting the variables from the make command. This patch introduces variables TPROGS_USER_CFLAGS/TPROGS_USER_LDFLAGS for this purpose, which can be set from the make command and their values are propagated to TPROGS_CFLAGS/TPROGS_LDFLAGS. Signed-off-by: Viktor Malik <vmalik@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/2d81100b830a71f0e72329cc7781edaefab75f62.1698213811.git.vmalik@redhat.com
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/Makefile5
1 files changed, 4 insertions, 1 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 90af76fa9dd8..5a9805edec93 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -150,6 +150,9 @@ always-y += ibumad_kern.o
always-y += hbm_out_kern.o
always-y += hbm_edt_kern.o
+TPROGS_CFLAGS = $(TPROGS_USER_CFLAGS)
+TPROGS_LDFLAGS = $(TPROGS_USER_LDFLAGS)
+
ifeq ($(ARCH), arm)
# Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux
# headers when arm instruction set identification is requested.
@@ -316,7 +319,7 @@ XDP_SAMPLE_CFLAGS += -Wall -O2 \
-I$(LIBBPF_INCLUDE) \
-I$(src)/../../tools/testing/selftests/bpf
-$(obj)/$(XDP_SAMPLE): TPROGS_CFLAGS = $(XDP_SAMPLE_CFLAGS)
+$(obj)/$(XDP_SAMPLE): TPROGS_CFLAGS = $(XDP_SAMPLE_CFLAGS) $(TPROGS_USER_CFLAGS)
$(obj)/$(XDP_SAMPLE): $(src)/xdp_sample_user.h $(src)/xdp_sample_shared.h
# Override includes for trace_helpers.o because __must_check won't be defined
# in our include path.