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[PATCH v2 2/2] build: Set default for CPP_FOR_BUILD environment variable in all cases.

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A default was set in the `"${build}" != "${host}"` case, but not in the
`"${build}" = "${host}"` case.

For a working build, this change should not make any difference. CPP_FOR_BUILD
is passed to build modules as CPP. If not set, autoconf macro AC_PROG_CC infers
CPP by trying various programs. First, it tries "$CC -E", which CPP will
default to in all cases with this patch.

The following command produces the same build directory with and without the
patch:

./configure --build=x86_64-make_autoconf_enable_cross_compiling-linux-gnu --host=x86_64-linux-gnu

The following command produces a Makefile containing `CPP_FOR_BUILD = ` without
the patch and containing `CPP_FOR_BUILD = $(CC_FOR_BUILD) -E` with the patch:

./configure

ChangeLog:

	* configure.ac: Set default for CPP_FOR_BUILD environment variable in all cases.
	* configure: Regenerate.

Signed-off-by: Manuel Jacob <me@manueljacob.de>
This commit is contained in:
Manuel Jacob
2026-05-01 11:38:01 -06:00
committed by Jeff Law
parent 7beb7a55a1
commit 526f0abf6d
2 changed files with 2 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
configure vendored
View File

@@ -4318,7 +4318,6 @@ if test "${build}" != "${host}" ; then
AR_FOR_BUILD=${AR_FOR_BUILD-ar}
AS_FOR_BUILD=${AS_FOR_BUILD-as}
CC_FOR_BUILD=${CC_FOR_BUILD-gcc}
CPP_FOR_BUILD="${CPP_FOR_BUILD-\$(CC_FOR_BUILD) -E}"
CXX_FOR_BUILD=${CXX_FOR_BUILD-g++}
DLLTOOL_FOR_BUILD=${DLLTOOL_FOR_BUILD-dlltool}
DSYMUTIL_FOR_BUILD=${DSYMUTIL_FOR_BUILD-dsymutil}
@@ -4350,6 +4349,7 @@ else
WINDRES_FOR_BUILD="${WINDRES_FOR_BUILD-\$(WINDRES)}"
WINDMC_FOR_BUILD="${WINDMC_FOR_BUILD-\$(WINDMC)}"
fi
CPP_FOR_BUILD="${CPP_FOR_BUILD-\$(CC_FOR_BUILD) -E}"
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'

2
configure.ac
View File

@@ -1453,7 +1453,6 @@ if test "${build}" != "${host}" ; then
AR_FOR_BUILD=${AR_FOR_BUILD-ar}
AS_FOR_BUILD=${AS_FOR_BUILD-as}
CC_FOR_BUILD=${CC_FOR_BUILD-gcc}
CPP_FOR_BUILD="${CPP_FOR_BUILD-\$(CC_FOR_BUILD) -E}"
CXX_FOR_BUILD=${CXX_FOR_BUILD-g++}
DLLTOOL_FOR_BUILD=${DLLTOOL_FOR_BUILD-dlltool}
DSYMUTIL_FOR_BUILD=${DSYMUTIL_FOR_BUILD-dsymutil}
@@ -1485,6 +1484,7 @@ else
WINDRES_FOR_BUILD="${WINDRES_FOR_BUILD-\$(WINDRES)}"
WINDMC_FOR_BUILD="${WINDMC_FOR_BUILD-\$(WINDMC)}"
fi
CPP_FOR_BUILD="${CPP_FOR_BUILD-\$(CC_FOR_BUILD) -E}"
AC_PROG_CC_C99
AC_PROG_CXX