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compile: Fix function pointers

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TBH while I always comment reasons for each of the compilation options in
reality I tried them all and chose that combination that needs the most simple
compile/compile-object-load.c (ld.so emulation) implementation.

gdb/ChangeLog
2015-01-22  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* compile/compile.c (_initialize_compile): Use -fPIE for compile_args.

gdb/testsuite/ChangeLog
2015-01-22  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.compile/compile.exp (pointer to jit function): New test.
This commit is contained in:
Jan Kratochvil 2015-01-22 19:18:16 +01:00
parent 82a864f96a
commit 4b62a76e0c
4 changed files with 17 additions and 3 deletions
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4
gdb/ChangeLog
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@ -1,3 +1,7 @@
2015-01-22 Jan Kratochvil <jan.kratochvil@redhat.com>
* compile/compile.c (_initialize_compile): Use -fPIE for compile_args.
2015-01-22 Eli Zaretskii <eliz@gnu.org>
* Makefile.in (HFILES_NO_SRCDIR): Remove ada-varobj.h.

7
gdb/compile/compile.c
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@ -645,12 +645,13 @@ String quoting is parsed like in shell, for example:\n\
/* Override flags possibly coming from DW_AT_producer. */
compile_args = xstrdup ("-O0 -gdwarf-4"
/* We use -fPIC Otherwise GDB would need to reserve space large enough for
/* We use -fPIE Otherwise GDB would need to reserve space large enough for
any object file in the inferior in advance to get the final address when
to link the object file to and additionally the default system linker
script would need to be modified so that one can specify there the
absolute target address. */
" -fPIC"
absolute target address.
-fPIC is not used at is would require from GDB to generate .got. */
" -fPIE"
/* We don't want warnings. */
" -w"
/* Override CU's possible -fstack-protector-strong. */

4
gdb/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2015-01-22 Jan Kratochvil <jan.kratochvil@redhat.com>
* gdb.compile/compile.exp (pointer to jit function): New test.
2015-01-17 Wei-cheng Wang <cole945@gmail.com>
* lib/gdb.exp (supports_process_record): Return true for

5
gdb/testsuite/gdb.compile/compile.exp
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@ -259,6 +259,11 @@ gdb_test_no_output "end" "compile code -r multiline 4"
gdb_test "print 'compile.c'::globalshadow" " = 77000" \
"check globalshadow with -r"
# Test GOT vs. resolving jit function pointers.
gdb_test_no_output "compile -raw -- int func(){return 21;} _gdb_expr(){int (*funcp)()=func; if (funcp()!=21) abort();}" \
"pointer to jit function"
#
# Test the case where the registers structure would not normally have
# any fields.