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Set -ffloat-store when building with gcc for i386.

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This helps the old and crappy x87 FPU to produce correct values. And
finally implement compiler detection in the Makefile.
This commit is contained in:
Yamagi Burmeister 2017-09-21 18:15:12 +02:00
parent ce2c3292c6
commit e5c39eeb7f
2 changed files with 41 additions and 0 deletions
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15
CMakeLists.txt
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@ -144,6 +144,21 @@ list(APPEND yquake2LinkerFlags ${CMAKE_DL_LIBS})
include_directories(${yquake2IncludeDirectories} ${CMAKE_SOURCE_DIR}/src/client/refresh/gl3/glad/include)
link_directories(${yquake2LinkerDirectories})
# If we're building with gcc for i386 let's define -ffloat-store.
# This helps the old and crappy x87 FPU to produce correct values.
# Would be nice if Clang had something comparable.
if ("${ARCH}" STREQUAL "i386")
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -ffloat-store")
endif()
endif()
# Force SSE math on x86_64. All sane compilers should do this
# anyway, just to protect us from broken Linux distros.
if ("${ARCH}" STREQUAL "x86_64")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpmath=sse")
endif()
set(Backends-Generic-Source
${BACKENDS_SRC_DIR}/generic/misc.c
${BACKENDS_SRC_DIR}/generic/qal.c

26
Makefile
View file

@ -124,6 +124,15 @@ else
YQ2_ARCH ?= $(shell uname -m | sed -e 's/i.86/i386/' -e 's/amd64/x86_64/' -e 's/^arm.*/arm/')
endif
# Detect the compiler
ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
COMPILER := clang
else ifeq ($(shell $(CC) -v 2>&1 | grep -c "gcc version"), 1)
COMPILER := gcc
else
COMPILER := unknown
endif
# Disable CDA for SDL2
ifeq ($(WITH_SDL2),yes)
ifeq ($(WITH_CDA),yes)
@ -178,6 +187,23 @@ endif
# ----------
# If we're building with gcc for i386 let's define -ffloat-store.
# This helps the old and crappy x87 FPU to produce correct values.
# Would be nice if Clang had something comparable.
ifeq ($(YQ2_ARCH), i386)
ifeq ($(COMPILER), gcc)
CFLAGS += -ffloat-store
endif
endif
# Force SSE math on x86_64. All sane compilers should do this
# anyway, just to protect us from broken Linux distros.
ifeq ($(YQ2_ARCH), x86_64)
CFLAGS += -mfpmath=sse
endif
# ----------
# Systemwide installation
ifeq ($(WITH_SYSTEMWIDE),yes)
CFLAGS += -DSYSTEMWIDE