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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 <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Link: https://lore.kernel.org/bpf/2d81100b830a71f0e72329cc7781edaefab75f62.1698213811.git.vmalik@redhat.com
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