path: root/m4/ax_prog_cc_for_build.m4
diff options
authorThierry Reding <>2012-10-19 14:03:01 +0200
committerKenneth Graunke <>2012-11-01 18:18:21 -0700
commit9948a33653088c2b9409f12924857643989657a5 (patch)
tree3b81d0caf60245caaa27cbbfd4edbb1518a82cbb /m4/ax_prog_cc_for_build.m4
parent8d3fb1be6bd61e59fa241d6422419119956b7d90 (diff)
build: Don't cross-compile GLSL builtin compiler
The builtin_compiler binary is used during the build process to generate code for the builtin GLSL functions. Since this binary needs to be run on the build host, it must not be cross-compiled. This patch fixes the build system to compile a second version of the source files and the builtin_compiler binary itself for the build system. It does so by defining the CC_FOR_BUILD and CXX_FOR_BUILD variables, which are searched for by the configure script and point to the location of native C and C++ compilers. In order for this to work properly, builtin_function.cpp is removed from BUILT_SOURCES, otherwise the build system would try to generate it before having had a chance to descend into the builtin_compiler subdirectory. With the builtin_compiler and glsl_compiler now being generated at different stages, the build instructions for glsl_compiler can be simplified a bit. Signed-off-by: Thierry Reding <> Acked-by: Kenneth Graunke <>
Diffstat (limited to 'm4/ax_prog_cc_for_build.m4')
1 files changed, 140 insertions, 0 deletions
diff --git a/m4/ax_prog_cc_for_build.m4 b/m4/ax_prog_cc_for_build.m4
new file mode 100644
index 00000000000..08095a83dfc
--- /dev/null
+++ b/m4/ax_prog_cc_for_build.m4
@@ -0,0 +1,140 @@
+# ===========================================================================
+# ===========================================================================
+# This macro searches for a C compiler that generates native executables,
+# that is a C compiler that surely is not a cross-compiler. This can be
+# useful if you have to generate source code at compile-time like for
+# example GCC does.
+# The macro sets the CC_FOR_BUILD and CPP_FOR_BUILD macros to anything
+# needed to compile or link (CC_FOR_BUILD) and preprocess (CPP_FOR_BUILD).
+# The value of these variables can be overridden by the user by specifying
+# a compiler with an environment variable (like you do for standard CC).
+# It also sets BUILD_EXEEXT and BUILD_OBJEXT to the executable and object
+# file extensions for the build platform, and GCC_FOR_BUILD to `yes' if
+# the compiler we found is GCC. All these variables but GCC_FOR_BUILD are
+# substituted in the Makefile.
+# Copyright (c) 2008 Paolo Bonzini <>
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+#serial 5
+pushdef([AC_TRY_COMPILER], [
+cat > conftest.$ac_ext << EOF
+#line __oline__ "configure"
+#include "confdefs.h"
+# If we can't run a trivial program, we are probably using a cross
+# Fail miserably.
+if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext} && (./conftest;
+exit) 2>/dev/null; then
+ [$2]=yes
+ echo "configure: failed program was:" >&AC_FD_CC
+ cat conftest.$ac_ext >&AC_FD_CC
+ [$2]=no
+rm -fr conftest*])dnl
+dnl Use the standard macros, but make them use other variable names
+pushdef([cross_compiling], [#])dnl
+pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl
+pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl
+pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl
+pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl
+pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl
+pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl
+pushdef([ac_cv_objext], ac_cv_build_objext)dnl
+pushdef([ac_exeext], ac_build_exeext)dnl
+pushdef([ac_objext], ac_build_objext)dnl
+pushdef([CC], CC_FOR_BUILD)dnl
+pushdef([CPP], CPP_FOR_BUILD)dnl
+pushdef([host], build)dnl
+pushdef([host_alias], build_alias)dnl
+pushdef([host_cpu], build_cpu)dnl
+pushdef([host_vendor], build_vendor)dnl
+pushdef([host_os], build_os)dnl
+pushdef([ac_cv_host], ac_cv_build)dnl
+pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
+pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
+pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
+pushdef([ac_cv_host_os], ac_cv_build_os)dnl
+pushdef([ac_cpp], ac_build_cpp)dnl
+pushdef([ac_compile], ac_build_compile)dnl
+pushdef([ac_link], ac_build_link)dnl
+pushdef([ac_tool_prefix], [#])dnl
+dnl Restore the old definitions
+dnl Finally, set Makefile variables