115 lines
3.7 KiB
Diff
115 lines
3.7 KiB
Diff
From 2ceaa9bc8a9a0c8a02806a92e19bd21b3fccf3a0 Mon Sep 17 00:00:00 2001
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From: Jan Tojnar <jtojnar@gmail.com>
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Date: Sat, 24 Dec 2022 16:46:18 +0100
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Subject: [PATCH 2/4] libbacktrace: Allow configuring debug dir
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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On platforms that do not use FHS like NixOS or GNU Guix,
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the build-id directories are not under `/usr/lib/debug`.
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Let’s add `--with-separate-debug-dir` configure flag so that
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the path can be changed. The same flag is supported by gdb:
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https://github.com/bminor/binutils-gdb/blob/095f84c7e3cf85cd68c657c46b80be078f336bc9/gdb/configure.ac#L113-L115
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---
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Makefile.am | 13 +++++++------
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configure.ac | 8 ++++++++
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elf.c | 4 ++--
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3 files changed, 17 insertions(+), 8 deletions(-)
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diff --git a/Makefile.am b/Makefile.am
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index 06ccf3f..6304faa 100644
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--- a/Makefile.am
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+++ b/Makefile.am
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@@ -33,7 +33,8 @@ ACLOCAL_AMFLAGS = -I config
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AM_CPPFLAGS =
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-AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG)
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+AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG) \
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+ -DSYSTEM_DEBUG_DIR=\"$(SEPARATE_DEBUG_DIR)\"
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include_HEADERS = backtrace.h backtrace-supported.h
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@@ -134,7 +135,7 @@ libbacktrace_noformat_la_DEPENDENCIES = $(libbacktrace_noformat_la_LIBADD)
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if HAVE_ELF
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if HAVE_OBJCOPY_DEBUGLINK
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-TEST_BUILD_ID_DIR=$(abs_builddir)/usr/lib/debug/.build-id/
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+TEST_DEBUG_DIR=$(abs_builddir)/usr/lib/debug
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check_LTLIBRARIES += libbacktrace_elf_for_test.la
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@@ -143,8 +144,8 @@ libbacktrace_elf_for_test_la_LIBADD = $(BACKTRACE_FILE) elf_for_test.lo \
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$(VIEW_FILE) $(ALLOC_FILE)
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elf_for_test.c: elf.c
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- SEARCH='^#define SYSTEM_BUILD_ID_DIR.*$$'; \
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- REPLACE="#define SYSTEM_BUILD_ID_DIR \"$(TEST_BUILD_ID_DIR)\""; \
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+ SEARCH='^#define BUILD_ID_DIR.*$$'; \
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+ REPLACE='\0\n#undef SYSTEM_DEBUG_DIR\n#define SYSTEM_DEBUG_DIR "$(TEST_DEBUG_DIR)"'; \
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$(SED) "s%$$SEARCH%$$REPLACE%" \
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$< \
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> $@.tmp
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@@ -474,13 +475,13 @@ endif HAVE_OBJCOPY_DEBUGLINK
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%_buildid: %
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./install-debuginfo-for-buildid.sh \
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- "$(TEST_BUILD_ID_DIR)" \
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+ "$(TEST_DEBUG_DIR)/.build-id" \
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$<
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$(OBJCOPY) --strip-debug $< $@
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%_buildidfull: %
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./install-debuginfo-for-buildid.sh \
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- "$(TEST_BUILD_ID_DIR)" \
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+ "$(TEST_DEBUG_DIR)/.build-id" \
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$<
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$(OBJCOPY) --strip-all $< $@
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diff --git a/configure.ac b/configure.ac
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index 69304ea..aeb2ee9 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -67,6 +67,14 @@ AM_MAINTAINER_MODE
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AC_ARG_WITH(target-subdir,
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[ --with-target-subdir=SUBDIR Configuring in a subdirectory for target])
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+AC_ARG_WITH(separate-debug-dir,
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+[ --with-separate-debug-dir=DEBUGDIR Look for global separate debug info in this path @<:@LIBDIR/debug@:>@],
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+[separate_debug_dir=$withval],
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+[separate_debug_dir=$libdir/debug])
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+
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+SEPARATE_DEBUG_DIR=$separate_debug_dir
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+AC_SUBST(SEPARATE_DEBUG_DIR)
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+
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# We must force CC to /not/ be precious variables; otherwise
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# the wrong, non-multilib-adjusted value will be used in multilibs.
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# As a side effect, we have to subst CFLAGS ourselves.
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diff --git a/elf.c b/elf.c
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index 3ef07bb..21fbe4f 100644
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--- a/elf.c
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+++ b/elf.c
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@@ -856,7 +856,7 @@ elf_readlink (struct backtrace_state *state, const char *filename,
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}
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}
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-#define SYSTEM_BUILD_ID_DIR "/usr/lib/debug/.build-id/"
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+#define BUILD_ID_DIR "/.build-id/"
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/* Open a separate debug info file, using the build ID to find it.
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Returns an open file descriptor, or -1.
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@@ -870,7 +870,7 @@ elf_open_debugfile_by_buildid (struct backtrace_state *state,
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backtrace_error_callback error_callback,
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void *data)
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{
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- const char * const prefix = SYSTEM_BUILD_ID_DIR;
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+ const char * const prefix = SYSTEM_DEBUG_DIR BUILD_ID_DIR;
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const size_t prefix_len = strlen (prefix);
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const char * const suffix = ".debug";
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const size_t suffix_len = strlen (suffix);
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--
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2.43.1
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