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scripts: allow skipping elfutils rebuild in build-fuzzers.sh

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This simplifies local reproduction of fuzzer reported errors.
E.g. the following sequence of commands would execute much faster on a
second run:

  $ SKIP_LIBELF_REBUILD=1 scripts/build-fuzzers.sh
  $ out/bpf-object-fuzzer <path-to-test-case>

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
This commit is contained in:
Eduard Zingerman
2025-07-18 16:42:07 -07:00
committed by Andrii Nakryiko
parent 9823ef295d
commit dac1ec64a3
1 changed files with 32 additions and 28 deletions
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60
scripts/build-fuzzers.sh
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@@ -35,44 +35,48 @@ if [[ "$SANITIZER" == undefined ]]; then
CXXFLAGS+=" $UBSAN_FLAGS"
fi
export SKIP_LIBELF_REBUILD=${SKIP_LIBELF_REBUILD:=''}
# Ideally libbelf should be built using release tarballs available
# at https://sourceware.org/elfutils/ftp/. Unfortunately sometimes they
# fail to compile (for example, elfutils-0.185 fails to compile with LDFLAGS enabled
# due to https://bugs.gentoo.org/794601) so let's just point the script to
# commits referring to versions of libelf that actually can be built
rm -rf elfutils
git clone https://sourceware.org/git/elfutils.git
(
cd elfutils
git checkout 67a187d4c1790058fc7fd218317851cb68bb087c
git log --oneline -1
if [[ ! -e elfutils || "$SKIP_LIBELF_REBUILD" == "" ]]; then
rm -rf elfutils
git clone https://sourceware.org/git/elfutils.git
(
cd elfutils
git checkout 67a187d4c1790058fc7fd218317851cb68bb087c
git log --oneline -1
# ASan isn't compatible with -Wl,--no-undefined: https://github.com/google/sanitizers/issues/380
sed -i 's/^\(NO_UNDEFINED=\).*/\1/' configure.ac
# ASan isn't compatible with -Wl,--no-undefined: https://github.com/google/sanitizers/issues/380
sed -i 's/^\(NO_UNDEFINED=\).*/\1/' configure.ac
# ASan isn't compatible with -Wl,-z,defs either:
# https://clang.llvm.org/docs/AddressSanitizer.html#usage
sed -i 's/^\(ZDEFS_LDFLAGS=\).*/\1/' configure.ac
# ASan isn't compatible with -Wl,-z,defs either:
# https://clang.llvm.org/docs/AddressSanitizer.html#usage
sed -i 's/^\(ZDEFS_LDFLAGS=\).*/\1/' configure.ac
if [[ "$SANITIZER" == undefined ]]; then
# That's basicaly what --enable-sanitize-undefined does to turn off unaligned access
# elfutils heavily relies on on i386/x86_64 but without changing compiler flags along the way
sed -i 's/\(check_undefined_val\)=[0-9]/\1=1/' configure.ac
if [[ "$SANITIZER" == undefined ]]; then
# That's basicaly what --enable-sanitize-undefined does to turn off unaligned access
# elfutils heavily relies on on i386/x86_64 but without changing compiler flags along the way
sed -i 's/\(check_undefined_val\)=[0-9]/\1=1/' configure.ac
fi
autoreconf -i -f
if ! ./configure --enable-maintainer-mode --disable-debuginfod --disable-libdebuginfod \
--disable-demangler --without-bzlib --without-lzma --without-zstd \
CC="$CC" CFLAGS="-Wno-error $CFLAGS" CXX="$CXX" CXXFLAGS="-Wno-error $CXXFLAGS" LDFLAGS="$CFLAGS"; then
cat config.log
exit 1
fi
make -C config -j$(nproc) V=1
make -C lib -j$(nproc) V=1
make -C libelf -j$(nproc) V=1
)
fi
autoreconf -i -f
if ! ./configure --enable-maintainer-mode --disable-debuginfod --disable-libdebuginfod \
--disable-demangler --without-bzlib --without-lzma --without-zstd \
CC="$CC" CFLAGS="-Wno-error $CFLAGS" CXX="$CXX" CXXFLAGS="-Wno-error $CXXFLAGS" LDFLAGS="$CFLAGS"; then
cat config.log
exit 1
fi
make -C config -j$(nproc) V=1
make -C lib -j$(nproc) V=1
make -C libelf -j$(nproc) V=1
)
make -C src BUILD_STATIC_ONLY=y V=1 clean
make -C src -j$(nproc) CFLAGS="-I$(pwd)/elfutils/libelf $CFLAGS" BUILD_STATIC_ONLY=y V=1