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build-sys: compile with -Og or -O1 when --enable-debug

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When --enable-debug is turned on, configure doesn't set -O level, and
uses default compiler -O0 level, which is slow.

Instead, use -Og if supported by the compiler (optimize debugging
experience), or -O1 (keeps code somewhat debuggable and works around
compiler bugs).

Unfortunately, gcc has many false-positive maybe-uninitialized
errors with Og and O1 (f27 gcc 7.2.1 20170915):

/home/elmarco/src/qemu/hw/ipmi/isa_ipmi_kcs.c: In function ‘ipmi_kcs_ioport_read’:
/home/elmarco/src/qemu/hw/ipmi/isa_ipmi_kcs.c:279:12: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     return ret;
            ^~~
cc1: all warnings being treated as errors
make: *** [/home/elmarco/src/qemu/rules.mak:66: hw/ipmi/isa_ipmi_kcs.o] Error 1
make: *** Waiting for unfinished jobs....
/home/elmarco/src/qemu/hw/ide/ahci.c: In function ‘ahci_populate_sglist’:
/home/elmarco/src/qemu/hw/ide/ahci.c:903:58: error: ‘tbl_entry_size’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
         if ((off_idx == -1) || (off_pos < 0) || (off_pos > tbl_entry_size)) {
                                                 ~~~~~~~~~^~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [/home/elmarco/src/qemu/rules.mak:66: hw/ide/ahci.o] Error 1
/home/elmarco/src/qemu/hw/display/qxl.c: In function ‘qxl_add_memslot’:
/home/elmarco/src/qemu/hw/display/qxl.c:1397:52: error: ‘pci_start’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     memslot.virt_end   = virt_start + (guest_end   - pci_start);
                                       ~~~~~~~~~~~~~^~~~~~~~~~~~
/home/elmarco/src/qemu/hw/display/qxl.c:1389:9: error: ‘pci_region’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
         qxl_set_guest_bug(d, "%s: pci_region = %d", __func__, pci_region);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

There seems to be a long list of related bugs in upstream GCC, some of
them are being fixed very recently:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639

For now, let's workaround it by using Wno-maybe-uninitialized (gcc-only).

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180104160523.22995-5-marcandre.lureau@redhat.com>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2018-01-04 17:05:09 +01:00 committed by Paolo Bonzini
parent de1da442ea
commit 906548689e
1 changed files with 13 additions and 2 deletions
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13
configure vendored
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@ -5194,7 +5194,18 @@ if test "$gcov" = "yes" ; then
LDFLAGS="-fprofile-arcs -ftest-coverage $LDFLAGS"
elif test "$fortify_source" = "yes" ; then
CFLAGS="-O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 $CFLAGS"
elif test "$debug" = "no"; then
elif test "$debug" = "yes"; then
if compile_prog "-Og" ""; then
CFLAGS="-Og $CFLAGS"
elif compile_prog "-O1" ""; then
CFLAGS="-O1 $CFLAGS"
fi
# Workaround GCC false-positive Wuninitialized bugs with Og or O1:
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639
if cc_has_warning_flag "-Wno-maybe-uninitialized"; then
CFLAGS="-Wno-maybe-uninitialized $CFLAGS"
fi
else
CFLAGS="-O2 $CFLAGS"
fi