http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57147
Bug #: 57147
Summary: [4.9 Regression]: setjmp call and if body wrongly
elided (function runs off early end)
Classification: Unclassified
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: rol...@gnu.org
Target: arm-linux-gnueabi
Created attachment 30006
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30006
preprocessed source
This is with trunk@198549. It's a regression from gcc-4_8-branch@198420.
Preprocessed source attached.
Configured as: --target=arm-linux-gnueabi --with-arch=armv7-a
Command line below.
This example is not expected to be usable on an arm-linux-gnueabi system,
but the problem is easily seen by examining the assembly. In the function
TestSyscall, a good compilation calls _setjmp, returns normally on a
nonzero result, and ends in an __assert_fail call (a noreturn function, so
no epilogue/return after the call) on a zero result. In a bad compilation,
the function just ends where the _setjmp call should be, no epilogue, no
return (so execution just runs into the following function).
gcc/cc1 -v -fpreprocessed syscall_return_regs_test.i -quiet -dumpbase
syscall_return_regs_test.c -mtls-dialect=gnu -auxbase-strip
scons-out/nacl_irt_test-arm-glibc/obj/tests/syscall_return_regs/syscall_return_regs_test.o
-g -O2 -Wstrict-prototypes -Wall -Wundef -Wpedantic -Werror
-Wno-variadic-macros -Wno-unused-local-typedefs -std=gnu99 -version
-fomit-frame-pointer -fdiagnostics-show-option -o syscall_return_regs_test.s
GNU C (GCC) version 4.9.0 20130502 (experimental) (arm-linux-gnueabi)
compiled by GNU C version 4.6.3, GMP version 5.0.2, MPFR version 3.1.0-p3,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory
"/usr/local/google/home/mcgrathr/gnu/build/inst/lib/gcc/arm-linux-gnueabi/4.9.0/include"
ignoring nonexistent directory
"/usr/local/google/home/mcgrathr/gnu/build/inst/lib/gcc/arm-linux-gnueabi/4.9.0/include-fixed"
ignoring nonexistent directory
"/usr/local/google/home/mcgrathr/gnu/build/inst/arm-linux-gnueabi/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/google/home/mcgrathr/gnu/build/inst/arm-linux-gnueabi/sys-include
End of search list.
GNU C (GCC) version 4.9.0 20130502 (experimental) (arm-linux-gnueabi)
compiled by GNU C version 4.6.3, GMP version 5.0.2, MPFR version 3.1.0-p3,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: e560f858071b4c04ef52cbbad3e21d4b
