From: Mike Frysinger <vap...@chromium.org>
Since libelf sometimes uses libpthread, we have to list that after -lelf
when someone tries to build statically. Else things go boom:
Makefile:479: *** No libelf.h/libelf found, please install \
libelf-dev/elfutils-libelf-devel. Stop.
Similarly, the -ldw test fails as it often uses -lz:
Makefile:462: No libdw.h found or old libdw.h found or elfutils is older \
than 0.138, disables dwarf support. Please install new
elfutils-devel/libdw-dev
And if we add debugging to try-cc, we see:
+ echo '#include <dwarf.h>
int main(void)
{
Dwarf *dbg = dwarf_begin(0, DWARF_C_READ);
return (long)dbg;
}'
+ i686-pc-linux-gnu-gcc -x c - -O2 -pipe -march=atom -mtune=atom -mfpmath=sse
-g \
-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE \
-ldw -lelf -static -lpthread -lrt -lelf -lm -o .24368
/usr/lib/libdw.a(dwarf_begin_elf.o):function check_section.isra.1: error:
undefined reference to 'inflateInit_'
/usr/lib/libdw.a(dwarf_begin_elf.o):function check_section.isra.1: error:
undefined reference to 'inflate'
/usr/lib/libdw.a(dwarf_begin_elf.o):function check_section.isra.1: error:
undefined reference to 'inflateReset'
/usr/lib/libdw.a(dwarf_begin_elf.o):function check_section.isra.1: error:
undefined reference to 'inflateEnd'
+ echo '#include <libelf.h>
int main(void)
{
Elf *elf = elf_begin(0, ELF_C_READ, 0);
return (long)elf;
}'
+ i686-pc-linux-gnu-gcc -x c - -O2 -pipe -march=atom -mtune=atom -mfpmath=sse
-g \
-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE \
-static -lpthread -lrt -lelf -lm -o .19216
/usr/lib/libelf.a(elf_begin.o):function file_read_elf: error: undefined
reference to 'pthread_rwlock_init'
/usr/lib/libelf.a(elf_begin.o):function __libelf_read_mmaped_file: error:
undefined reference to 'pthread_rwlock_init'
/usr/lib/libelf.a(elf_begin.o):function __libelf_read_mmaped_file: error:
undefined reference to 'pthread_rwlock_init'
/usr/lib/libelf.a(elf_begin.o):function read_file: error: undefined reference
to 'pthread_rwlock_init'
/usr/lib/libelf.a(elf_begin.o):function lock_dup_elf.8072: error: undefined
reference to 'pthread_rwlock_unlock'
/usr/lib/libelf.a(elf_begin.o):function lock_dup_elf.8072: error: undefined
reference to 'pthread_rwlock_wrlock'
/usr/lib/libelf.a(elf_begin.o):function elf_begin: error: undefined reference
to 'pthread_rwlock_rdlock'
/usr/lib/libelf.a(elf_begin.o):function elf_begin: error: undefined reference
to 'pthread_rwlock_unlock'
Signed-off-by: Mike Frysinger <vap...@gentoo.org>
---
tools/lib/lk/Makefile | 2 +-
tools/perf/Makefile | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/lib/lk/Makefile b/tools/lib/lk/Makefile
index 926cbf3..973692a 100644
--- a/tools/lib/lk/Makefile
+++ b/tools/lib/lk/Makefile
@@ -11,7 +11,7 @@ LIB_OBJS += $(OUTPUT)debugfs.o
LIBFILE = liblk.a
CFLAGS = -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2
$(EXTRA_WARNINGS) $(EXTRA_CFLAGS) -fPIC
-EXTLIBS = -lpthread -lrt -lelf -lm
+EXTLIBS = -lelf -lpthread -lrt -lm
ALL_CFLAGS = $(CFLAGS) $(BASIC_CFLAGS) -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64
ALL_LDFLAGS = $(LDFLAGS)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index b0f164b..db353e3 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -111,7 +111,7 @@ ifdef NO_NEWT
endif
CFLAGS = -fno-omit-frame-pointer -ggdb3 -funwind-tables -Wall -Wextra
-std=gnu99 $(CFLAGS_WERROR) $(CFLAGS_OPTIMIZE) $(EXTRA_WARNINGS)
$(EXTRA_CFLAGS) $(PARSER_DEBUG_CFLAGS)
-EXTLIBS = -lpthread -lrt -lelf -lm
+EXTLIBS = -lelf -lpthread -lrt -lm
ALL_CFLAGS = $(CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
-D_GNU_SOURCE
ALL_LDFLAGS = $(LDFLAGS)
STRIP ?= strip
@@ -598,7 +598,7 @@ else
LIBDW_LDFLAGS := -L$(LIBDW_DIR)/lib
endif
- FLAGS_DWARF=$(ALL_CFLAGS) $(LIBDW_CFLAGS) -ldw -lelf $(LIBDW_LDFLAGS)
$(ALL_LDFLAGS) $(EXTLIBS)
+ FLAGS_DWARF=$(ALL_CFLAGS) $(LIBDW_CFLAGS) -ldw -lz -lelf
$(LIBDW_LDFLAGS) $(ALL_LDFLAGS) $(EXTLIBS)
ifneq ($(call try-cc,$(SOURCE_DWARF),$(FLAGS_DWARF),libdw),y)
msg := $(warning No libdw.h found or old libdw.h found or
elfutils is older than 0.138, disables dwarf support. Please install new
elfutils-devel/libdw-dev);
NO_DWARF := 1
--
1.8.2.1
--
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