[quake3-bugzilla] [Bug 6429] vm_x86.c inline assembly error on hosts using -fPIC

[bugzilla-daemon at icculus.org]

https://bugzilla.icculus.org/show_bug.cgi?id=6429

--- Comment #9 from Mark <mark at noffle.net> ---
I think I see where the problem lies when comparing your compiler string to the
one being generated by my gcc version.

It seems as though it compiles cleanly when optimizations are disabled however
when the release build occurs, -O3 is passed which immediately causes the
error.

My compilation:
cc  -DDEDICATED -Wall -fno-strict-aliasing -Wimplicit -Wstrict-prototypes -pipe
-DUSE_ICON -DARCH_STRING=\"x86\" -m32 -DNO_GZIP -Icode/zlib -DUSE_INTERNAL_JPEG
-Icode/jpeg-8c -DUSE_LOCAL_HEADERS
-DPRODUCT_VERSION=\"1.36_GIT_3d55e71-2016-06-15\" -Wformat=2
-Wno-format-zero-length -Wformat-security -Wno-format-nonliteral
-Wstrict-aliasing=2 -Wmissing-format-attribute -Wdisabled-optimization
-Werror-implicit-function-declaration -MMD  -DNDEBUG -O3 -march=i586
-ffast-math -o build/release-linux-x86/ded/vm_x86.o -c code/qcommon/vm_x86.c

code/qcommon/vm_x86.c: In function 'VM_CallCompiled':
code/qcommon/vm_x86.c:1791:2: error: 'asm' operand has impossible constraints
  __asm__ volatile(
  ^

with no optimizations:
$ cc  -DDEDICATED -Wall -fno-strict-aliasing -Wimplicit -Wstrict-prototypes
-pipe -DUSE_ICON -DARCH_STRING=\"x86\" -m32 -DNO_GZIP -Icode/zlib
-DUSE_INTERNAL_JPEG -Icode/jpeg-8c -DUSE_LOCAL_HEADERS
-DPRODUCT_VERSION=\"1.36_GIT_3d55e71-2016-06-15\" -Wformat=2
-Wno-format-zero-length -Wformat-security -Wno-format-nonliteral
-Wstrict-aliasing=2 -Wmissing-format-attribute -Wdisabled-optimization
-Werror-implicit-function-declaration -MMD  -DNDEBUG -O0 -march=i586
-ffast-math -o build/release-linux-x86/ded/vm_x86.o -c code/qcommon/vm_x86.c
$

Can you try compiling as a Release build and see if you can reproduce?

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