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Add -fno-strict-aliasing workaround for Linux GCC targets 

Most Linux distros work around aliasing problems in Mesa by compiling
with the GCC option -fno-strict-aliasing. Two examples:

  https://bugs.freedesktop.org/show_bug.cgi?id=6046
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=394311

This makes -fno-strict-aliasing the default with a comment that
developers should consider commenting it out. There is a already a note
about these bugs in docs/helpwanted.html.
This commit is contained in:
Dan Nicholson 2007-10-31 09:47:39 -07:00
parent 2bdd467dfd
commit 013dbcd611
15 changed files with 48 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
configs/linux
View File

@ -28,6 +28,10 @@ CFLAGS = -Wall -Wmissing-prototypes $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) \
CXXFLAGS = -Wall $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) $(DEFINES) \
$(X11_INCLUDES)
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
GLUT_CFLAGS = -fexceptions
EXTRA_LIB_PATH = -L/usr/X11R6/lib

4
configs/linux-alpha
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@ -11,6 +11,10 @@ CFLAGS = -O3 -mcpu=ev5 -ansi -mieee -pedantic -fPIC -D_XOPEN_SOURCE -DUSE_XSHM
CXXFLAGS = -O3 -mcpu=ev5 -ansi -mieee -pedantic -fPIC -D_XOPEN_SOURCE
GLUT_CFLAGS = -fexceptions
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
GL_LIB_DEPS = -L/usr/X11R6/lib -lX11 -lXext -lm -lpthread
GLUT_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GLU_LIB) -l$(GL_LIB) -L/usr/X11R6/lib -lX11 -lXmu -lXt -lXi -lm
GLW_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB) -L/usr/X11R6/lib -lXt -lX11

3
configs/linux-alpha-static
View File

@ -12,6 +12,9 @@ CXXFLAGS = -O3 -mcpu=ev5 -ansi -mieee -pedantic -D_XOPEN_SOURCE
GLUT_CFLAGS = -fexceptions
MKLIB_OPTIONS = -static
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
# Library names (actual file names)
GL_LIB_NAME = libGL.a

4
configs/linux-directfb
View File

@ -13,6 +13,10 @@ CFLAGS = -Wall -O3 -ffast-math -fPIC -std=c99 -D_GNU_SOURCE -D_POSIX_SOURCE -D
CXXFLAGS = -Wall -O3 -fPIC -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
HAVE_X86 = $(shell uname -m | grep 'i[3-6]86' >/dev/null && echo yes)
ifeq ($(HAVE_X86), yes)
CFLAGS += -DUSE_X86_ASM -DUSE_MMX_ASM -DUSE_3DNOW_ASM -DUSE_SSE_ASM

3
configs/linux-dri
View File

@ -32,6 +32,9 @@ CFLAGS = -Wall -Wmissing-prototypes -std=c99 -ffast-math \
CXXFLAGS = -Wall $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) $(DEFINES)
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
ASM_SOURCES =

3
configs/linux-dri-xcb
View File

@ -32,6 +32,9 @@ CFLAGS = -Wall -Wmissing-prototypes $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) \
CXXFLAGS = -Wall $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) $(DEFINES)
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
ASM_SOURCES =

3
configs/linux-fbdev
View File

@ -6,6 +6,9 @@ CONFIG_NAME = linux-fbdev
CFLAGS = -O3 -ffast-math -ansi -pedantic -fPIC -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE -DPTHREADS -DUSE_GLFBDEV_DRIVER
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
SRC_DIRS = mesa glu glut/fbdev
DRIVER_DIRS = fbdev osmesa
PROGRAM_DIRS = fbdev demos redbook samples

3
configs/linux-glide
View File

@ -12,6 +12,9 @@ CFLAGS = -O3 -ansi -pedantic -fPIC -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE
CXXFLAGS = -O3 -ansi -pedantic -fPIC -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE
GLUT_CFLAGS = -fexceptions
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
# Library/program dependencies
GL_LIB_DEPS = -L/usr/X11R6/lib -lX11 -lXext -L/usr/local/glide/lib -lglide3x -lm -lpthread

3
configs/linux-indirect
View File

@ -33,6 +33,9 @@ CFLAGS = $(WARN_FLAGS) $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) $(DEFINES) \
CXXFLAGS = $(WARN_FLAGS) $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) $(DEFINES)
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
ASM_SOURCES =

3
configs/linux-osmesa
View File

@ -12,6 +12,9 @@ CXX = g++
CFLAGS = -O3 -ansi -pedantic -fPIC -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE -DPTHREADS
CXXFLAGS = -O3 -ansi -pedantic -fPIC -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
# Directories
SRC_DIRS = mesa glu

3
configs/linux-osmesa16
View File

@ -10,6 +10,9 @@ CXX = g++
CFLAGS = -O3 -ansi -pedantic -fPIC -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE -DUSE_XSHM -DPTHREADS -I/usr/X11R6/include -DCHAN_BITS=16 -DDEFAULT_SOFTWARE_DEPTH_BITS=31
CXXFLAGS = -O3 -ansi -pedantic -fPIC -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
# Library names
OSMESA_LIB = OSMesa16

3
configs/linux-osmesa16-static
View File

@ -11,6 +11,9 @@ CFLAGS = -O3 -ansi -pedantic -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=19930
CXXFLAGS = -O3 -ansi -pedantic -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE
MKLIB_OPTIONS = -static
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
# Library names
OSMESA_LIB = OSMesa16

3
configs/linux-osmesa32
View File

@ -10,6 +10,9 @@ CXX = g++
CFLAGS = -O3 -ansi -pedantic -fPIC -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE -DUSE_XSHM -DPTHREADS -I/usr/X11R6/include -DCHAN_BITS=32 -DDEFAULT_SOFTWARE_DEPTH_BITS=31
CXXFLAGS = -O3 -ansi -pedantic -fPIC -ffast-math -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
# Library names
OSMESA_LIB = OSMesa32

3
configs/linux-solo
View File

@ -32,6 +32,9 @@ CFLAGS = $(WARN_FLAGS) $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) $(DEFINES) \
CXXFLAGS = $(WARN_FLAGS) $(OPT_FLAGS) $(PIC_FLAGS) $(ARCH_FLAGS) $(DEFINES)
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
ASM_SOURCES =

3
configs/linux-x86-glide
View File

@ -14,6 +14,9 @@ CXXFLAGS = -Wall -O3 -ansi -pedantic -fPIC -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199
GLUT_CFLAGS = -fexceptions
# Work around aliasing bugs - developers should comment this out
CFLAGS += -fno-strict-aliasing
CXXFLAGS += -fno-strict-aliasing
ASM_SOURCES = $(X86_SOURCES)
ASM_API = $(X86_API)