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.

diff --git a/configs/linux b/configs/linux
index 0d455ff..15700a1 100644 (file)
--- a/configs/linux
+++ b/configs/linux
@@ -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

diff --git a/configs/linux-alpha b/configs/linux-alpha
index d69aabb..65bf0c2 100644 (file)
--- a/configs/linux-alpha
+++ b/configs/linux-alpha
@@ -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

diff --git a/configs/linux-alpha-static b/configs/linux-alpha-static
index 2a30af9..08ec2d1 100644 (file)
--- a/configs/linux-alpha-static
+++ b/configs/linux-alpha-static
@@ -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

diff --git a/configs/linux-directfb b/configs/linux-directfb
index 09332f4..2a9843e 100644 (file)
--- a/configs/linux-directfb
+++ b/configs/linux-directfb
@@ -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

diff --git a/configs/linux-dri b/configs/linux-dri
index 2369f75..a9ff7e9 100644 (file)
--- a/configs/linux-dri
+++ b/configs/linux-dri
@@ -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 = 
 

diff --git a/configs/linux-dri-xcb b/configs/linux-dri-xcb
index 1f233f0..6964371 100644 (file)
--- a/configs/linux-dri-xcb
+++ b/configs/linux-dri-xcb
@@ -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 = 
 

diff --git a/configs/linux-fbdev b/configs/linux-fbdev
index e36d20a..69d1012 100644 (file)
--- a/configs/linux-fbdev
+++ b/configs/linux-fbdev
@@ -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

diff --git a/configs/linux-glide b/configs/linux-glide
index 0a40521..31475c8 100644 (file)
--- a/configs/linux-glide
+++ b/configs/linux-glide
@@ -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

diff --git a/configs/linux-indirect b/configs/linux-indirect
index bd33345..17c7126 100644 (file)
--- a/configs/linux-indirect
+++ b/configs/linux-indirect
@@ -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 = 
 

diff --git a/configs/linux-osmesa b/configs/linux-osmesa
index cc1fbbd..163b145 100644 (file)
--- a/configs/linux-osmesa
+++ b/configs/linux-osmesa
@@ -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

diff --git a/configs/linux-osmesa16 b/configs/linux-osmesa16
index 1fb0186..796fba1 100644 (file)
--- a/configs/linux-osmesa16
+++ b/configs/linux-osmesa16
@@ -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

diff --git a/configs/linux-osmesa16-static b/configs/linux-osmesa16-static
index 6645504..22f6851 100644 (file)
--- a/configs/linux-osmesa16-static
+++ b/configs/linux-osmesa16-static
@@ -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

diff --git a/configs/linux-osmesa32 b/configs/linux-osmesa32
index a1e5a35..12d0cb0 100644 (file)
--- a/configs/linux-osmesa32
+++ b/configs/linux-osmesa32
@@ -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

diff --git a/configs/linux-solo b/configs/linux-solo
index 2d0817d..e01f2c8 100644 (file)
--- a/configs/linux-solo
+++ b/configs/linux-solo
@@ -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 = 
 

diff --git a/configs/linux-x86-glide b/configs/linux-x86-glide
index f2f8aee..941efc1 100644 (file)
--- a/configs/linux-x86-glide
+++ b/configs/linux-x86-glide
@@ -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)