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Fix cpuid.h detection in configure.ac

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Only gcc in the x86 architectures contain cpuid.h. Therefore this would not
 compile in other architectures.
 .
 To fix this:
 1) Pass a warning instead of an error saying that the header file is missing.
 2) Disable optimizations if cpuid.h was not found.
 .
 Behaviour:
 1) In non-x86 architectures we have no cpuid.h. We give a warning which I hope
 makes sense and is basically saying this is normal in non-x86 architectures and
 and we will ALWAYS disable the optimizations.
 2) In x86 architectures with cpuid.h we get the desired behaviour and check if
 the user request optimizations and if they are supported by the cpu.
 3) In x86 architectures w/o cpuid.h we give a warning basically telling the
 user to upgrade gcc and we ALWAYS disable optimizations since we can only tell
 there is sse/mmx support at build time but not at runtime.
 4) In non-x86 architectures with some unexpected cpuid.h the sse/mmx checks
 should fail and these optimizations will get disabled.
 .
 Tested in:
 amd64, i386: x86 + cpuid.h
 armel, armhf: non-x86 + no cpuid.h
 armel, armhf: non-x86 + dummy cpuid.h to pass test
 .
 The last test should simulate the case of an x86 with no mmx/sse (old i386).
 The 2nd test should be equal to x86 + no cpuid.h.
Author: Miguel Colon <debian.micove@gmail.com>
This commit is contained in:
oparviai 2012-04-04 15:37:39 +00:00
parent 67a202aee8
commit d110158b4d
1 changed files with 8 additions and 6 deletions
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12
configure.ac
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@ -56,11 +56,13 @@ dnl ############################################################################
AC_HEADER_STDC
#AC_HEADER_SYS_WAIT
# add any others you want to check for here
AC_CHECK_HEADERS([cpuid.h],,[AC_MSG_ERROR([cpuid.h not found, install gcc >= 4.3])])
AC_CHECK_HEADERS([cpuid.h])
if test "x$ac_cv_header_cpuid_h" = "xno"; then
AC_MSG_WARN([The cpuid.h file was not found therefore the x86 optimizations will be disabled.])
AC_MSG_WARN([If using a x86 architecture and optimizations are desired then please install gcc (>= 4.3).])
AC_MSG_WARN([If using a non-x86 architecture then this is expected and can be ignored.])
fi
dnl ############################################################################
@ -103,7 +105,7 @@ fi
# Check if optimizations are supported in the system at build time.
if test "x$enable_x86_optimizations" = "xyes"; then
if test "x$enable_x86_optimizations" = "xyes" -a "x$ac_cv_header_cpuid_h" = "xyes"; then
echo "****** x86 optimizations enabled ******"
original_saved_CXXFLAGS=$CXXFLAGS