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selftests, x86: Rework x86 target architecture detection 

We currently fail to build on a non-multilib x86_64 target.  We
print a helpful error, but it's nicer to allow the build to succeed.
Fix it and improve cross-compilation support by detecting
architecture support directly and building only the relevant tests.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
Andy Lutomirski 2015-05-11 15:11:36 -07:00 committed by Shuah Khan
parent c1e6e5cb94
commit e9886ace22
4 changed files with 67 additions and 26 deletions
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55
tools/testing/selftests/x86/Makefile
View File

@ -1,4 +1,8 @@
.PHONY: all all_32 all_64 check_build32 clean
all:
include ../lib.mk
.PHONY: all all_32 all_64 warn_32bit_failure clean
TARGETS_C_BOTHBITS := sigreturn single_step_syscall
@ -7,29 +11,24 @@ BINARIES_64 := $(TARGETS_C_BOTHBITS:%=%_64)
CFLAGS := -O2 -g -std=gnu99 -pthread -Wall
all:
UNAME_M := $(shell uname -m)
CAN_BUILD_I386 := $(shell ./check_cc.sh $(CC) trivial_32bit_program.c -m32)
CAN_BUILD_X86_64 := $(shell ./check_cc.sh $(CC) trivial_64bit_program.c)
ifeq ($(CROSS_COMPILE),)
# Always build 32-bit tests
ifeq ($(CAN_BUILD_I386),1)
all: all_32
# Install 32-bit tests
TEST_PROGS += $(BINARIES_32)
# If we're on a 64-bit host, build 64-bit tests as well
ifeq ($(UNAME_M),x86_64)
endif
ifeq ($(CAN_BUILD_X86_64),1)
all: all_64
# Install 64-bit tests
TEST_PROGS += $(BINARIES_64)
endif
endif
all_32: check_build32 $(BINARIES_32)
all_32: $(BINARIES_32)
all_64: $(BINARIES_64)
include ../lib.mk
clean:
$(RM) $(BINARIES_32) $(BINARIES_64)
@ -39,16 +38,20 @@ $(TARGETS_C_BOTHBITS:%=%_32): %_32: %.c
$(TARGETS_C_BOTHBITS:%=%_64): %_64: %.c
$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
check_build32:
@if ! $(CC) -m32 -o /dev/null trivial_32bit_program.c; then \
echo "Warning: you seem to have a broken 32-bit build" 2>&1; \
echo "environment. If you are using a Debian-like"; \
echo " distribution, try:"; \
echo ""; \
echo " apt-get install gcc-multilib libc6-i386 libc6-dev-i386"; \
echo ""; \
echo "If you are using a Fedora-like distribution, try:"; \
echo ""; \
echo " yum install glibc-devel.*i686"; \
exit 1; \
fi
# x86_64 users should be encouraged to install 32-bit libraries
ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),01)
all: warn_32bit_failure
warn_32bit_failure:
@echo "Warning: you seem to have a broken 32-bit build" 2>&1; \
echo "environment. This will reduce test coverage of 64-bit" 2>&1; \
echo "kernels. If you are using a Debian-like distribution," 2>&1; \
echo "try:"; 2>&1; \
echo ""; \
echo " apt-get install gcc-multilib libc6-i386 libc6-dev-i386"; \
echo ""; \
echo "If you are using a Fedora-like distribution, try:"; \
echo ""; \
echo " yum install glibc-devel.*i686"; \
exit 0;
endif

16
tools/testing/selftests/x86/check_cc.sh Executable file
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@ -0,0 +1,16 @@
#!/bin/sh
# check_cc.sh - Helper to test userspace compilation support
# Copyright (c) 2015 Andrew Lutomirski
# GPL v2
CC="$1"
TESTPROG="$2"
shift 2
if "$CC" -o /dev/null "$TESTPROG" -O0 "$@" 2>/dev/null; then
echo 1
else
echo 0
fi
exit 0

4
tools/testing/selftests/x86/trivial_32bit_program.c
View File

@ -4,6 +4,10 @@
* GPL v2
*/
#ifndef __i386__
# error wrong architecture
#endif
#include <stdio.h>
int main()

18
tools/testing/selftests/x86/trivial_64bit_program.c Normal file
View File

@ -0,0 +1,18 @@
/*
* Trivial program to check that we have a valid 32-bit build environment.
* Copyright (c) 2015 Andy Lutomirski
* GPL v2
*/
#ifndef __x86_64__
# error wrong architecture
#endif
#include <stdio.h>
int main()
{
printf("\n");
return 0;
}