Re: [Qemu-devel] [PATCH 4/8] convert libqemuutil to meson

[Paolo Bonzini]

On 29/07/19 14:41, Alex Bennée wrote:
>> I'd suggest we don't actually /need/ per-file compiler flags in most
>> cases. eg when we add  $foo.o-libs += $(FOO_LIBS) that's not really
>> a per-file setting when it gets expanded onto the final linker line.
>> Its just a "-lfoo" that gets used for the library as a while.
> We do for tests, often to select a specific processor type or feature we
> need to build that particular instance of the test.

Tests are also adding cflags per-executable, not per-.o file:

tests/tcg/aarch64/Makefile.softmmu-target:memory: CFLAGS+=-DCHECK_UNALIGNED=1
tests/tcg/alpha/Makefile.softmmu-target:memory: CFLAGS+=-DCHECK_UNALIGNED=0
tests/tcg/alpha/Makefile.target:test-cmov: EXTRA_CFLAGS=-DTEST_CMOV
tests/tcg/arm/Makefile.softmmu-target:test-armv6m-undef: 
EXTRA_CFLAGS+=-mcpu=cortex-m0
tests/tcg/arm/Makefile.target:hello-arm: CFLAGS+=-marm -ffreestanding
tests/tcg/arm/Makefile.target:test-arm-iwmmxt: CFLAGS+=-marm -march=iwmmxt 
-mabi=aapcs -mfpu=fpv4-sp-d16
tests/tcg/arm/Makefile.target:# fcvt: CFLAGS+=-march=armv8.2-a+fp16 
-mfpu=neon-fp-armv8
tests/tcg/i386/Makefile.softmmu-target:memory: CFLAGS+=-DCHECK_UNALIGNED=1
tests/tcg/i386/Makefile.target:hello-i386: CFLAGS+=-ffreestanding
tests/tcg/mips/Makefile.target:hello-mips: CFLAGS+=-mno-abicalls -fno-PIC 
-mabi=32

(They also do not use unnesting).

Paolo